View EMC1438-2-AP-TR_9011004.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

smsc emc1438 datasheet revision 1.0 (04-29-10) datasheet product features emc1438 1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones general description the emc1438 is a high accuracy, low cost, system management bus (smbus) temperature sensor. advanced features such as resistance error correction (rec), beta compensation (to cpu diodes requiring the bjt or transistor model) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications. additionally, the hardware controlled standby pin allows for system level power shutdown to support energy saving initiatives. the emc1438 monitors up to eight temperature channels (up to seven external and one internal). the device provides 1c accuracy for the internal and external diode temperatures. temperature monitoring inclu des two tiers of protection: one that can be masked and causes the alert pin to be asserted, and the other that cannot be masked and causes the therm pin to be asserted. applications ? notebook computers ? desktop computers ? industrial ? embedded applications features ? hardware set standby mode ? 200ua (typical) quiescent current in standby ? designed to support 45nm, 65nm, and 90nm cpu diodes ? supports diodes requiring the bjt or transistor model ? resistance error correct ion (up to 100 ohms) ? up to seven external temperature monitors ? 1c accuracy (40c < t diode < 110c) ? 0.125c resolution ? supports up to 2.2nf filter capacitor ? anti-parallel diodes for extra diode support and compact design ? internal temperature monitor ? 1c accuracy ? 0.125c resolution ? programmable temperature limits for alert and therm ? 3.3v supply voltage ? smbus 2.0 interface ? pin-selectable smbus address ? block read and write ? available in a 16-pin 4mm x 4mm qfn lead-free rohs compliant package block diagram analog mux external temp diode inputs internal temp diode 11 bit adc temp registers smbus slave protocol dp1 dn1 smclk smdata dp2 / dn3 dn2 / dp3 dn4 / dp5 dp4 / dn5 anti- parallel diode hottest of comparison dn6 / dp7 dp6 / dn7 voltage register voltage to temp conversion alert standby addr_sel therm
reel size is 4,000 pieces this product meets the halogen maximum concentration values per iec61249-2-21 for rohs compliance and environmen tal information, please visit www.smsc.com/rohs ordering number package features emc1438-1-ap-tr 16-pin qfn 4mm x 4mm (lead-free rohs compliant) up to 7 external diodes. ?hottest of? temperature comparison. alert and therm outputs. standby low power state. alert pin masked and apds enabled at power up. EMC1438-2-AP-TR 16-pin qfn 4mm x 4mm (lead-free rohs compliant) up to 7 external diodes. ?hottest of? temperature comparison. alert and therm outputs. standby low power state. alert pin masked and apds disabled at power up. 1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 2 smsc emc1438 datasheet 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2010 smsc or its su bsidiaries. all rights reserved. circuit diagrams and other information re lating to smsc products are included as a means of illustrating typical applications. consequently, complete information sufficient for cons truction purposes is not necess arily given. although the inform ation has been checked and is bel ieved to be accurate, no responsibility is assumed for inaccuraci es. smsc reserves the right to make chang es to specifications and product descriptio ns at any time without notice. contact your local smsc sales office to obtain the la test specifications before placi ng your product order. the provisi on of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellect ual property rights of smsc or others. all sales are expressly conditional on your agr eement to the terms and conditions of the most recently dated ve rsion of smsc's standard terms of sale agreement dated befor e the date of your order (the "terms of sale agreement"). the product may contain d esign defects or errors known as anomalies which may cause the product's functions to deviate from published specif ications. anomaly sheets are available upon request. smsc products are not designed, in tended, authorized or warranted for use in any life support or other application whe re product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of this document or other smsc litera ture, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at http://www.smsc.com. smsc is a registered trademark of standar d microsystems corporation (?smsc?). product names and company name s are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, includi ng without limitation any and all implied warranties of merchantability, fitness for a part icular purpose, title, and against infringement and the like, and any and all warranties arising from any course of dealing or us age of trade. in no event shall smsc be liable for any direct, incidental, indirect, special, punitive, or consequential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contract; tort; negligence of smsc or others; strict liability; breach of warranty; or othe rwise; whether or not any re medy of buyer is held to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages. ordering information:
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 3 revision 1.0 (04-29-10) datasheet table of contents chapter 1 delta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 delta from emc1428 to emc1438 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 chapter 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 smbus electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 chapter 4 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 system management bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.1 smbus start bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.2 smbus address and rd / wr bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1.3 smbus ack and nack bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.4 smbus stop bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.5 smbus time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.6 smbus and i 2 c compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 smbus protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2.1 write byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.2 read byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.3 send byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.4 receive byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.5 block write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.6 block read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2.7 alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6 chapter 5 product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 register bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.2 power states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.3 temperature monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.3.1 status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.3.2 limits and fault queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.3.3 ?hottest of? comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.3.4 diode faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.4 alert output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.4.1 alert pin interrupt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.4.2 alert pin comparator mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.5 therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.6 system configuration controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.1 resistance error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.2 beta compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.3 digital averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.4 conversion rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.5 dynamic averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.7 diode connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 chapter 6 register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.1 data read interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6.3 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 4 smsc emc1438 datasheet 6.4 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.5 conversion rate register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.6 temperature limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6.7 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.8 therm hysteresis register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.9 therm limit registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.10 external diode fault register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.11 channel interrupt mask register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.12 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.13 beta configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 6.14 hottest temperature registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.15 hottest temperature status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.16 high limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.17 low limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 6.18 therm limit status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.19 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.20 hottest configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.21 channel configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.22 filter control register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 6.23 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 6.24 manufacturer id register (feh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 6.25 revision register (ffh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 chapter 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.1 emc1438 package drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.2 package markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 7.2.1 emc1438 (16-pin 4mm x 4mm qfn) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 chapter 8 datasheet revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 5 revision 1.0 (04-29-10) datasheet list of figures figure 2.1 emc1438 pin diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 4.1 smbus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 5.1 system diagram for emc1438 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 5.2 diode connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 7.1 16-pin qfn 4mm x 4mm package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 figure 7.2 16-pin qfn 4mm x 4mm pcb footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 figure 7.3 16-pin qfn 4mm x 4mm package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 figure 7.4 emc1438 package marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 6 smsc emc1438 datasheet list of tables table 2.1 emc1438 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 2.2 pin type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3.2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3.3 smbus electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4.1 addr_sel resistor setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4.2 protocol format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 4.3 write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 4.4 read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 4.5 send byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 4.6 receive byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 4.7 block write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 4.8 block read protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 4.9 alert response address protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 5.1 supply current vs. conversion rate for emc1438 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 6.1 register set in hexadecimal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 6.2 temperature data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 6.3 temperature data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 6.4 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 6.5 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 6.6 conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.7 conversion rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.8 maximum conversion rate per temperature channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.9 temperature limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 6.10 one shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 6.11 therm hysteresis register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 6.12 therm limit registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 6.13 external diode fault register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 table 6.14 channel interrupt mask register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 table 6.15 consecutive alert register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 table 6.16 consecutive alert settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 table 6.17 beta configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 table 6.18 beta compensation look up table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 table 6.19 hottest temperature registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 table 6.20 hottest temperature register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 table 6.21 high limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 table 6.22 low limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 table 6.23 therm limit status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 table 6.24 rec configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 table 6.25 hottest configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 table 6.26 channel configuration register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 table 6.27 filter control register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 table 6.28 product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 table 6.29 manufacturer id register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 table 6.30 revision register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 table 8.1 customer revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 7 revision 1.0 (04-29-10) datasheet chapter 1 delta 1.1 delta from emc1428 to emc1438 1. order numbers emc1438-1 and emc1438-2. 2. pin 5 was changed from trip_set to addr_sel. 3. pin 6 was changed from sys_shdn to therm . 4. pin 13 was changed from n/c to standby . 5. added standby low power state (see section 5.2, "power states" ) and standby register bit (see section 6.4, "configuration register" ). 6. added pin-selectable smbus address (see section 4.1.2, "smbus address and rd / wr bit" ). 7. added support for smbus block read and write. 8. changed default for mask_all bit to 1, which prevents alert# pin assertion in interrupt mode (see section 6.4, "confi guration register" ). 9. removed sys_shdn configuration register 1dh. 10. changed default channel interrupt mask regist er 1fh from f0h to 00h so all of the enabled channels will assert the alert pin in comparator mode (see section 6.11, "channel interrupt mask register" ). 11. emc1438-1 changed default channel configuration r egister 3bh from 00h to 0eh so all of the dpx/dnx and dnx/dpx pins power up with apd enabled, thereby enabling all temperature channels at power up (see section 6.21, "channel configuration register" ). emc1438-2 leaves the register default set at 00h.
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 8 smsc emc1438 datasheet chapter 2 pin description figure 2.1 emc1438 pin diagram table 2.1 emc1438 pin description pin number name function type 1 dp1 dp1 - external diode 1 positive (anode) connection. aio 2 dn1 external diode 1 negative (cathode) connection. aio 3 dp2 / dn3 external diode 2 positive (anode) connection and external diode 3 negative (cathode) connection aio 4 dn2 / dp3 external diode 2 negative (cathode) connection and external diode 3 positive (anode) connection aio 5 addr_sel selects smbus address via pull-down resistor. ai 6 therm active low output - requires pull-up resistor. if not used, connect to ground. od (5v) 7alert active low interrupt - requires pull-up resistor. if not used, connect to ground. od (5v) 8 gnd ground connection power emc1438 16-pin qfn smdata smclk 1 2 3 4 vdd dp1 dn1 dp2 / dn3 12 11 10 9 16 15 14 13 5 6 7 8 dn2 / dp3 dp4 / dn5 dn4 / dp5 gnd addr_sel dp6 / dn7 dn6 / dp7 standby alert therm
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 9 revision 1.0 (04-29-10) datasheet the pin types are described ta b l e 2 . 2 . all pins labeled (5v) are 5v tolerant. application note: for the 5v tolerant pins that have a pull-up resistor, the voltage difference between vdd and the pull-up voltage must never exceed 3.6v. 9 dn4 / dp5 external diode 4 negative (cathode) connection and external diode 5 positive (anode) connection aio 10 dp4 / dn5 external diode 4 positive (anode) connection and external diode 5 negative (cathode) connection aio 11 smdata smbus data input/output - r equires pull-up resistor diod (5v) 12 smclk smbus clock input - requires pull-up resistor di (5v) 13 standby active low input that places the device into the standby state. if not used, connect to v dd . di (5v) 14 dn6 / dp7 external diode 6 negative (cathode) connection and external diode 7 positive (anode) connection aio 15 dp6 / dn7 external diode 6 positive (anode) connection and external diode 7 negative (cathode) connection aio 16 vdd power supply power table 2.2 pin type pin type function power used to supply either vdd or gnd to the device di 5v tolerant digital input od 5v tolerant open drain digital output. requires a pull-up resistor diod 5v tolerant bi-directional digital input / open-drain output. requires a pull-up resistor. aio analog input / output used for external diodes or analog inputs ai analog input - this pin is used as an input for analog signals. table 2.1 emc1438 pin description (continued) pin number name function type
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 10 smsc emc1438 datasheet chapter 3 electrical specifications 3.1 absolute maximum ratings note: stresses at or above those listed could cause pe rmanent damage to the device. this is a stress rating only and functional operation of the devic e at any other condition above those indicated in the operation sections of th is specification is not implied. prolonged stresses above the stated operating levels and below the absolute maximum ratings may degrade device performance and lead to permanent damage. note 3.1 for the 5v tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6v when the device is unpowered. note 3.2 the package power dissipation specification assumes a thermal via design with the thermal landing soldered to the pcb ground plane with four 12 mil vias. note 3.3 junction to ambient (ja) is dependent on the design of the thermal vias. without thermal vias and a thermal landing, the ja is approximately 60c/w including localized pcb temperature increase. table 3.1 absolute maximum ratings description rating unit supply voltage (v dd ) -0.3 to 4.0 v voltage on 5v tolerant pins (v 5vt_pin ) -0.3 to 5.5 v voltage on 5v tolerant pins (|v 5vt_pin - v dd |) (see note 3.1 )0 to 3.6 v voltage on any other pin to ground -0.3 to v dd +0.3 v operating temperature range -40 to +125 c storage temperature range -55 to +150 c lead temperature range refer to jedec spec. j-std-020 qfn-16 package power dissipation (see note 3.2 ) 0.5w up to t a = 85c w junction to ambient ( ja ) (see note 3.3 )58c/w esd rating, all pins hbm 2000 v
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 11 revision 1.0 (04-29-10) datasheet 3.2 electrical specifications table 3.2 electrical specifications v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions dc power supply voltage v dd 3.0 3.3 3.6 v supply current i dd 395 450 ua 1 conversion / sec, dynamic averaging disabled i dd 700 960 ua 4 conversions / sec, dynamic averaging enabled standby supply current i stby 200 ua monitoring disabled. internal temperature monitor temperature accuracy 0.25 1 c 0c < t a < 100c 2 c -40c < t a < 125c temperature resolution 0.125 c external temperature monitor temperature accuracy 0.25 1 c +40c < t diode < +110c 0c < t a < 110c 0.5 2 c -40c < t diode < 127c temperature resolution 0.125 c conversion time all channels t conv 170 ms default settings capacitive filter c filter 2.2 2.7 nf connected across external diode resistance error correction r series 100 in series with dp and dn lines alert and therm pins output low voltage v ol 0.4 v i sink = 8ma leakage current i leak 5 ua powered or unpowered t a < 85c pull-up voltage < 3.6v smclk, smdata, and standby pins input high voltage v ih 2.0 v dd v5v tolerant input low voltage v il -0.3 0.8 v 5v tolerant input high/low current i ih / i il 5 ua powered or unpowered t a < 85c
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 12 smsc emc1438 datasheet 3.3 smbus electrical characteristics power up timing first conversion ready t conv_f 300 ms time after power up before all channels updated with valid data smbus delay t smb_d 25 ms delay before smbus communications should be sent by host table 3.3 smbus elect rical specifications v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values are at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions smbus interface hysteresis 420 mv input capacitance c in 5pf output low sink current i ol 8.2 15 ma smdata = 0.4v smbus timing clock frequency f smb 10 400 khz spike suppression t sp 50 ns bus free time start to stop t buf 1.3 us hold time: start t hd:sta 0.6 us setup time: start t su:sta 0.6 us setup time: stop t su:stp 0.6 us data hold time t hd:dat 0us data setup time t su:dat 100 ns clock low period t low 1.3 us clock high period t high 0.6 us clock/data fall time t fall 300 ns min = 20+0.1c load ns clock/data rise time t rise 300 ns min = 20+0.1c load ns f smb > 100khz clock/data rise time t rise 1000 ns min = 20+0.1c load ns f smb < 100khz capacitive load c load 400 pf per bus line table 3.2 electrical specifications (continued) v dd = 3.0v to 3.6v, t a = -40c to 125c, all typical values at t a = 27c unless otherwise noted. characteristic symbol min typ max units conditions
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 13 revision 1.0 (04-29-10) datasheet chapter 4 system management bus interface protocol 4.1 system management bus interface protocol the emc1438 communicates with a host controller, su ch as an smsc sio, through the smbus. the smbus is a two-wire serial communication prot ocol between a computer host and its peripheral devices. a detailed timing diagram is shown in figure 4.1 . stretching of the smclk signal is supported; however, the emc1438 will not stretch the clock signal. 4.1.1 smbus start bit the smbus start bit is defined as a transition of th e smbus data line from a logic ?1? state to a logic ?0? state while the smbus clock line is in a logic ?1? state. 4.1.2 smbus address and rd / wr bit the smbus address byte consists of the 7-bit client address followed by a 1-bit rd / wr indicator. if this rd / wr bit is a logic ?0?, the smbus host is writi ng data to the client device. if this rd / wr bit is a logic ?1?, the smbus host is re ading data from the client device. the emc1438 smbus address is determined by a single resistor connected between ground and the addr_sel pin, as shown in ta b l e 4 . 1 . all smbus data bytes are sent most significant bit first and composed of 8-bits of information. figure 4.1 smbus timing diagram table 4.1 addr_sel resistor setting resistor (+/-10%) smbus address resistor (+/- 10%) smbus address gnd 1001_100(r/w) 1500 1001_001(r/w) 270 1001_101(r/w) 2700 1001_010(r/w) 560 1001_110(r/w) 5600 1001_011(r/w) 1000 1001_111(r/w) > 18000 0011_000(r/w) smdata smclk t buf p s s - start condition p - stop condition p s t high t low t hd:sta t su:sto t hd:sta t hd:dat t su:dat t su:sta t fall t rise
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 14 smsc emc1438 datasheet 4.1.3 smbus ack and nack bits the smbus client will acknowledge all data bytes that it receives (as well as the client address if it matches and the ara address if the alert pin is asserted). this is done by the client device pulling the smbus data line low after the 8th bit of each byte that is transmitted. the host will nack (not acknowledge) the data re ceived from the client by holding the smbus data line high after the 8th data bit has been sent. 4.1.4 smbus stop bit the smbus stop bit is defined as a transition of the smbus data line from a logic ?0? state to a logic ?1? state while the smbus clock line is in a logic ?1? state. when the emc1438 detects an smbus stop bit, and it has been communicating with the smbus pr otocol, it will reset its client interface and prepare to receive further communications. 4.1.5 smbus time-out the emc1438 includes an smbus time -out feature. following a 30ms period of inactivity on the smbus, the device will time-out and reset the smbus interface. the time-out functionality defaults to disabled and can be enabled by writing to the timeout bit (see section 6.12, "consecutive alert register" ). 4.1.6 smbus and i 2 c compliance the major differences between smbus and i 2 c devices are highlighted here. for complete compliance information, refer to the smbus 2.0 specification. 1. minimum frequency for smbus communications is 10khz. 2. the client protocol will reset if the clock is held at a logic ?0? for longer than 30ms. this time-out functionality is disabled by default. 3. the client protocol will reset if both the clock and data lines are held at a logic ?1? for longer than 150us. this function is disabled by default. 4. i 2 c devices do not support the alert response addre ss functionality (which is optional for smbus). 4.2 smbus protocols the emc1438 is smbus 2.0 compatible and supports send byte, read byte, receive byte, write byte, block read, and block write as valid protocols. it will respond to the alert response address protocol but is not in full compliance. all of the below protocols use the convention in ta b l e 4 . 2 . attempting to communicate with t he emc1438 smbus interface with an invalid slave address or invalid protocol will result in no response from the de vice and will not affect its register contents. table 4.2 protocol format data sent to device data sent to the host
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 15 revision 1.0 (04-29-10) datasheet 4.2.1 write byte the write byte is used to write one byte of data to the registers as shown below table 4.3 : 4.2.2 read byte the read byte protocol is used to read one byte of data from the registers as shown in table 4.4 . 4.2.3 send byte the send byte protocol is used to set the internal address register pointer to the correct address location. no data is transferred during the send byte protocol as shown in ta b l e 4 . 5 . 4.2.4 receive byte the receive byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via send byte). this is used for consecutive reads of the same register as shown in ta b l e 4 . 6 . 4.2.5 block write the block write is used to write multiple data byte s to a group of contiguous registers, as shown in table 4.7 . it is an extension of the write byte protocol. table 4.3 write byte protocol start slave address wr ack register address ack register data ack stop 1 -> 0 yyyy_yyy 0 0 xxh 0 xxh 0 0 -> 1 table 4.4 read byte protocol start slave address wr ack register address ack start slave address rd ack register data nack stop 1-> 0 yyyy_yyy 0 0 xxh 0 0 -> 1 yyyy_yyy 1 0 xxh 1 0 -> 1 table 4.5 send byte protocol start slave address wr ack register address ack stop 1 -> 0 yyyy_yyy 0 0 xxh 0 1 -> 0 table 4.6 receive byte protocol start slave address rd ack register data nack stop 1 -> 0 yyyy_yyy 1 0 xxh 1 1 -> 0
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 16 smsc emc1438 datasheet 4.2.6 block read the block read is used to read multiple data bytes from a group of contiguous registers, as shown in table 4.8 . it is an extension of the read byte protocol. 4.2.7 alert response address the alert output can be used as a proce ssor interrupt or as an smbus alert. when it detects that the alert pin is asserted, the host will send the alert response address (ara) to the general address of 0001_100b. all devices wi th active interrupts will respond with their client address as shown in table 4.9 . the emc1438 will respond to the ara in the following way if the alert pin is asserted: 1. send slave address and verify that full slav e address was sent (i.e. the smbus communication from the device was not prematurely stopped due to a bus contention event). 2. set the mask bit to clear the alert pin. application note: the ara does not clear the status register. if the mask bit is cleared prior to the status register being cleared, the alert pin will be reasserted. table 4.7 block write protocol start slave address wr ack register address ack register data ack 1 ->0 yyyy_yyy 0 0 xxh 0 xxh 0 register data ack register data ack . . . register data ack stop xxh 0 xxh 0 . . . xxh 0 0 -> 1 table 4.8 block read protocol start slave address wr ack register address ack start slave address rd ack register data 1->0 yyyy_yyy 0 0 xxh 0 1 ->0 yyyy_yyy 1 0 xxh ack register data ack register data ack register data ack . . . register data nack stop 0 xxh 0 xxh 0 xxh 0 . . . xxh 1 0 -> 1 table 4.9 alert response address protocol start alert response address rd ack device address nack stop 1 -> 0 0001_100 1 0 yyyy_yyy 1 1 -> 0
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 17 revision 1.0 (04-29-10) datasheet chapter 5 product description the emc1438 is an smbus temperature sensor that m onitors up to seven (7) external diodes and one internal diode. thermal management is performed in cooperation with a host device. this consists of the host reading the temperature data of both the external and inte rnal temperature diodes of the emc1438 and using that data to control the speed of one or more fans. the emc1438 provides two levels of monitoring. the first emc1438 provides a maskable alert signal to the host when measured te mperatures meet or exceed user programmable limits. this allows the emc1438 to be used as an independent the rmal watchdog to warn the host of temperature hot spots without constant monitoring by the host. the second level of monitoring provides a non-maskable interrupt on the therm pin if the measured values meet or exceed a second programmable limit. because the emc1438 automatically corrects for temperature errors due to series resistance in temperature diode lines, there is greater flexibilit y in where external diodes are positioned and better measurement accuracy than previously available devic es without resistance error correction. as well, the automatic beta detection feat ure means that there is no need to program the device according to which type of diode is present. therefore, the device can power up ready to operate for any system configuration including those diodes that require the bjt or transistor model. figure 5.1 shows a system level block diagram of the emc1438. 5.1 register bits unless otherwise stated when a bit is ?s et?, it is written to a logic ?1?. likewise when a bit is ?cleared?, it is written to a logic ?0?. figure 5.1 system diagram for emc1438 cpu emc1438 host smbus interface dp1 dn1 dp2 / dn3 dn2 / dp3 dp4 / dn5 dn4 / dp5 optional anti- parallel diodes dp6 / dn7 dn6 / dp7 vdd smclk smdata therm standby optional anti- parallel diodes optional anti- parallel diodes alert addr_sel
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 18 smsc emc1438 datasheet 5.2 power states the emc1438 contains two power states that are determined by the standby pin. they are: 1. active - this power state is enabled when the standby pin is held at a logic ?1? and when the standby bit is cleared (see section 6.4, "configuration register" ). in this state, the device is fully active and monitoring all active channels. 2. standby - this power state is enabled when the standby pin is held at a logic ?0? or when the standby bit is set (see section 6.4, "config uration register" ). in this state, the device is powered down. it will not sample any of the channels nor will it check limits or assert the alert or therm pin. the device will respond to smbus commands normally and the user may initiate a ?one-shot? command (see section 6.7, "one shot register" ) which will cause the device to measure all active channels and then return to the standby state. it will compare the measured temperature against the limits, but will not assert the alert or therm pins. application note: to clear status bits while the device is in st andby, initiate the ?one-shot? command with the error conditions removed and read the status registers. when the device is returned to the active state, the status regi sters will be cleared and then updated after the first conversion time. the alert and therm pins cannot be asserted until after the first conversion is completed after coming out of standby. 5.3 temperature monitoring the emc1438 can monitor the temperature of up to seven (7) externally connected diodes as well as the internal or am bient temperature. 5.3.1 status the emc1438 provides a register that summarizes error conditions (see section 6.3, "status register" ) as well as separate registers to identify the spec ific channel(s) causing specific error conditions (see section 6.15, "hottest temperature status register" , section 6.16, "high limit status register" , section 6.17, "low limit status register" , section 6.10, "external diode fault register" , and section 6.18, "therm limit status register" ). the summary status register bits are set whenever a bit is set in one of the specific status registers. these bits are set regardless of masking. 5.3.2 limits and fault queues the emc1438 provides programmable high, low, and therm limits for each channel (see section 6.6, "temperature limit registers" and section 6.9, "therm limit registers" ). when a temperature channel limit is exceeded for a programmable number of cons ecutive readings (fault queue - see below), the specific limit status register is updated as well as the summary status register. the emc1438 contains multiple fault queue counters. each out of limit error and diode fault condition has its own counter associated with it. the counter s are user programmable and determine the number of consecutive measurements that a temperature channel must be out-of-limit or reporting a diode fault before the corresponding status bits are set (see section 6.12, "consecutive alert register" ). each counter is incremented whenever the corresponding channel exceeds the appropriate limit (e.g. if external diode 1 exceeds its high limit, it will increm ent its high counter). additionally, each counter is reset if the condition has been removed. the therm fault counter is incremented w henever any of the measurements exceed the corresponding therm limit. if the temperature dr ops below the therm limit minus the corresponding hysteresis (see section 6.8, "therm hysteresis register" ), the counter is re set. if the programmed number of consecutive measurements exceed the therm limit, the corresponding therm limit status bit is set. once the status bit is set, th e consecutive therm counter will not reset until the corresponding temperature drops below the approp riate limit minus the corresponding hysteresis.
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 19 revision 1.0 (04-29-10) datasheet when the alert pin is configured as a comparator (see section 5.4.2, "alert pin comparator mode" ), only the high limit fault counter is used; it is incremented if the m easured temperature meets or exceeds the high limit. the fault queue counters for low limit and diode fault are not used, so the applicable status bits are updated after a single out-of-limit or diode fault and the alert pin will not be asserted. once the high limit fault coun ter reaches the programmed limit, the alert pin will be asserted (if not masked), but the counter will not be re set. it will remain set until the temperature drops below the high limit minus the therm hysteresis value (see section 6.8, "therm hysteresis register" ). the following is an example of how the counters work . if the calrt[2:0] bits are set for 4 consecutive alerts on an emc1438 device, the high limits are set at 70c, and none of the channels are masked, the status bits will be asserted afte r the following four measurements: 1. internal diode reads 71c and both external dio des read 69c. consecutive alert counter for int is incremented to 1. 2. both the internal diode and the external diode 1 read 71c and external diode 2 reads 68c. consecutive alert counter for int is incremented to 2 and for ext1 is set to 1. 3. the external diode 1 reads 71c and both the internal diode and external diode 2 read 69c. consecutive alert counter for int and ext2 are cleared and ext1 is incremented to 2. 4. the internal diode reads 71c and both external diodes read 71c. consecutive alert counter for int is set to 1, ext2 is set to 1, and ext1 is incremented to 3. 5. the internal diode reads 71c and both the exte rnal diodes read 71c. consecutive alert counter for int is incremented to 2, ext2 is set to 2, and ext1 is incremented to 4. the high status bit are set for ext1 and the alert pin is asserted. the ext1 counter is reset to 0 and all other counters hold the last value until the next temperat ure measurement. 5.3.3 ?hottest of? comparison at the end of every measurement cycle, the emc143 8 compares all of the user selectable external diode channels (see section 6.20, "h ottest configuration register" ) to determine which of these channels is reporting the hottest temperature. the hottest temperature is stored in the hottest temperature registers and the appropriate status bit in the hottest status register is set (see section 6.15, "hottest temperature status register" ). if multiple temperature channels measure the same temperature and are equal to the hottest temper ature, the hottest status will be based on the measurement order. as an optional feature, the emc1438 can also flag an event if the hottest temperature channel changes (see section 6.21, "channel configuration register" ). for example, suppose that external diode channels 1, 3, and 4 are programmed to be compared in the ?hottest of? comparison. if the external diode 1 channel reports the hottest temperature of the three, its temperature is copied into the hottest temperature registers (in addition to the external diode 1 temperature registers) and it is flagged in the hottest status bit. if, on the next measurem ent, the external diode 3 channel temperature has increased such that it is now the hottest temperatur e, the emc1438 can flag this event as an interrupt condition and assert the alert pin. 5.3.4 diode faults the emc1438 actively detects an open and short condition on each measurement channel. when a diode fault is detected and meets the criteria (see section 5.3.2, "limits and fault queues" ), the temperature data msbyte is forced to a value of 80h, the fault bit is set in the status register, and the bit corresponding to the channel is set in the external diode fault register (see section 6.10,
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 20 smsc emc1438 datasheet "external diode fault register" ). when an external diode channel is configured to operate in apd mode, the circuitry will detect independent open fault conditions; however, a short condition will be shared between the apd channels. 5.4 alert output the alert pin is an open drain output and has two modes of operation: interrupt mode and comparator mode. the mode of the alert output is selected via the alert / comp bit (see section 6.4, "configuration register" ). 5.4.1 alert pin interrupt mode when configured to operate in interrupt mode and enabled, the alert pin asserts low when an out of limit measurement (> high limit or < low limit) is detected on any diode or when a diode fault is detected. the alert pin will remain asserted as long as an out-of-limit condition remains. once the out-of-limit condition has been removed, the alert pin will remain asserted until the appropriate specific status register bits are cleared ( section 5.3.1, "status" ). each channel is subject to the fault queue (see section 5.3.2, "limits and fault queues" ). the mask_all bit (see section 6.4, "configuration register" ) can be set to ?1?, so the alert pin is masked. alternatively, the mask_all bit can be se t to ?0? and individual channels can be masked by setting corresponding bits in the channel interrupt mask register (see section 6.11, "channel interrupt mask register" ). when the alert pin is masked, it is de-asserted and remains de-asserted until the mask is removed by the user. the alert pin is used as an interrupt signal or as an smbus alert signal that allows an smbus slave to communicate an error condition to the master. one or more alert outputs can be hard-wired together. 5.4.2 alert pin comparator mode when the alert pin is configured to operate in comparat or mode, it will be asserted if any of the measured temperatures m eets or exceeds the respective high limit. low temperature out of limit and diode faults will not assert the alert pin. the alert pin will remain asserted until all temperatures drop below the corresponding high limit minus the therm hysteresis value. each channel is subject to the high limit fault queue (see section 5.3.2, "limits and fault queues" ). when the alert pin is asserted in comparator mode, the hi gh status bit in the status register and the appropriate bit in the high limit status register will be set. reading these bits will not clear them until the alert pin is deasserted. once the alert pin is deasserted, the status bits will be automatically cleared. the mask_all bit will not block the alert pin in this mode; however, the individual channel masks (see section 6.11, "channel interrupt mask register" ) will prevent the respective channel from asserting the alert pin, although the status bits will still be set. 5.5 therm output the therm pin is asserted independently of the alert pin and cannot be masked. the temperature is compared against the corresponding therm limit (see section 6.9, "therm limit registers" ). whenever any of the measured temperatures linked to the therm pin meet or exceed the therm criteria (see section 5.3.2, "limits and fault queues" ), the therm pin is asserted. once it has been asserted, it will remain asserted until all measured temperatures drop below the therm limit minus the programmable therm hysteresis (see section 6.8, "therm h ysteresis register" ).
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 21 revision 1.0 (04-29-10) datasheet 5.6 system configuration controls each channel can be configured to use resistance error correction, beta compensation, and digital averaging based on user settings and system requ irements. conversion rates and dynamic averaging are also configurable. 5.6.1 resistance error correction the emc1438 includes active resistance error correction to remove the effect of up to 100 ohms of series resistance. without this aut omatic feature, voltage developed across the parasitic resistance in the remote diode path causes the temperature to read higher than the true temperature is. the error induced by parasitic resistance is approximately +0.7 c per ohm. sources of series resistance include bulk resistance in the remote temperature transis tor junctions, series resistance in the cpu, and resistance in the printed circuit board traces and package leads. resistance error correction in the emc1438 eliminates the need to characterize and compensate for parasitic resistance in the remote diode path. 5.6.2 beta compensation the forward current gain, or beta, of a transistor is not constant as emitter currents change. as well, it is not constant over changes in temperature. the variation in beta causes an error in temperature reading that is proportional to absolute temperat ure. compensating for this error is also known as implementing the bjt or transistor model for temperature measurement. for discrete transistors configured with the collect or and base shorted together, the beta is generally sufficiently high such that the percent change in beta variation is very small. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 50 would contribute approximately 0.25c error at 100c. however, fo r substrate transistors where the base-emitter junction is used for temperature measurement and the collector is tied to the substrate, the proportional beta variation will cause large error. for example, a 10% variation in beta for two forced emitter currents with a transistor whose ideal beta is 0.5 woul d contribute approximately 8.25c error at 100c. the beta compensation circuitry in the emc1438 corrects for this beta variation to eliminate any error which would normally be induced. it automatically detects the appropriate beta setting to use. 5.6.3 digital averaging to reduce the effect of noise and temperature spikes on the reported temperature, all of the external diode channels can use digital averaging. this aver aging acts as a running average using the previous four measured values. the default setting is to have digital averaging disabled for all channels. it can be enabled for each channel individually by the filter control register ( section 6.22, "filter control register" ). 5.6.4 conversion rates the emc1438 may be configured for different c onversion rates based on the system requirements. the conversion rate is configured as described in section 6.5, "conversion rate register" . the default conversion rate is 4 conversions per second. ot her available conversion rates are shown in table 6.7 . 5.6.5 dynamic averaging dynamic averaging causes the emc1438 to measure the external diode channels for an extended time based on the selected conversion rate. this functionality can be disabled for increased power savings at the lower conversion rates (see section 6.4, "config uration register" ). when dynamic averaging is enabled, the device will automatically adjust the sampling and measurement time for the external diode channels. this allows the device to average 2x or 4x longer than the normal 11 bit operation (nominally 21ms per channel) while still maintaining the sele cted conversion rate. the benefits of dynamic
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 22 smsc emc1438 datasheet averaging are improved noise rejection due to the longer integration time as well as less random variation of the temperature measurement. when enabled, the dynamic averaging will affect the average supply current based on the chosen conversion rate as shown in ta b l e 5 . 1 for emc1438. 5.7 diode connections the diode connection for the external diode 1 channel can support a discrete diode-connected transistor (such as a 2n3904) or a substrate transistor (such as th ose found in a cpu or gpu). anti- parallel diodes are supported on all diode channels, except the external diode 1 channel. figure 5.2 shows examples of diode connections. table 5.1 supply current vs. conversion rate for emc1438 conversion rate average supply current averaging factor (based on 11-bit operation) dynamic averaging enabled (default) dynamic averaging disabled dynamic averaging enabled (default) dynamic averaging disabled 1 / sec 715ua 450ua 4x 1x 2 / sec 750ua 550ua 2x 1x 4 / sec (default) 900ua 815ua 1x 1x continuous (see table 6.8 ) 950ua 950ua 0.5x 0.5x figure 5.2 diode connections local ground to dp1 typical remote substrate transistor e.g. cpu substrate pnp typical remote discrete npn transistor e.g. 2n3904 to dn1 to dp1 to dn1 to dpx / dny to dny / dpx anti-parallel diodes using discrete npn transistors external diode pair external diode 1 external diode 1 x y
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 23 revision 1.0 (04-29-10) datasheet chapter 6 register description the registers shown in ta b l e 6 . 1 are accessible through the smbus. an entry of ?-? indicates that the bit is not used and will always read ?0?. in some registers, the emc1438-1 and emc1438-2 ha ve different defaults. due to space limitations, these are noted in the default value columns using ?(-1)? for emc1438-1 and ?(-2)? for emc1438- 2. table 6.1 register set in hexadecimal order register address r/w register name function default value page 00h r internal diode data high byte stores the integer data for the internal diode 00h page 28 01h r external diode 1 data high byte stores the integer data for the external diode 1 00h page 28 02h r-c status reports general error conditions 00h page 29 03h r/w configuration controls the general operation of the device (mirrored at address 09h) 80h page 30 04h r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 0ah) 06h (4/sec) page 31 05h r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 0bh) 55h (85c) page 31 06h r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 0ch) 00h (0c) page 31 07h r/w external diode 1 high limit high byte stores the integer portion of the high limit for the external diode 1 (mirrored at register 0dh) 55h (85c) page 31 08h r/w external diode 1 low limit high byte stores the integer portion of the low limit for the external diode 1 (mirrored at register 0eh) 00h (0c) page 31 09h r/w configuration controls the general operation of the device (mirrored at address 03h) 80h page 30 0ah r/w conversion rate controls the conversion rate for updating temperature data (mirrored at address 04h) 06h (4/sec) page 31 0bh r/w internal diode high limit stores the 8-bit high limit for the internal diode (mirrored at address 05h) 55h (85c) page 31 0ch r/w internal diode low limit stores the 8-bit low limit for the internal diode (mirrored at address 06h) 00h (0c) page 31
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 24 smsc emc1438 datasheet 0dh r/w external diode 1 high limit high byte stores the integer portion of the high limit for the external diode 1 (mirrored at register 07h) 55h (85c) page 31 0eh r/w external diode 1 low limit high byte stores the integer portion of the low limit for the external diode 1 (mirrored at register 08h) 00h (0c) page 31 0fh w one shot a write to this register during standby initiates a one shot update. 00h page 34 10h r external diode 1 data low byte stores the fractional data for the external diode 1 00h page 28 13h r/w external diode 1 high limit low byte stores the fractional portion of the high limit for the external diode 1 00h page 31 14h r/w external diode 1 low limit low byte stores the fractional portion of the low limit for the external diode 1 00h page 31 15h r/w external diode 2 high limit high byte stores the integer portion of the high limit for external diode 2 55h (85c) page 31 16h r/w external diode 2 low limit high byte stores the integer portion of the low limit for external diode 2 00h (0c) page 31 17h r/w external diode 2 high limit low byte stores the fractional portion of the high limit external diode 2 00h page 31 18h r/w external diode 2 low limit low byte stores the fractional portion of the low limit for external diode 2 00h page 31 19h r/w external diode 1 therm limit stores the 8-bit critical temperature limit for the external diode 1 55h (85c) page 35 1ah r/w external diode 2 therm limit stores the 8-bit critical temperature limit for external diode 2 55h (85c) page 35 1bh r-c external diode fault stores status bits indicating which external diode detected a diode fault 00h page 36 1fh r/w interrupt mask register controls the masking of the alert pin for individual channels 00h page 36 20h r/w internal diode therm limit stores the 8-bit critical temperature limit for the internal diode 55h (85c) page 35 21h r/w therm hysteresis stores the 8-bit hysteresis value that applies to all therm limits 0ah (10c) page 35 22h r/w consecutive alert controls the number of out-of-limit conditions that must occur before the status bit is asserted 70h page 37 23h r external diode 2 data high byte stores the integer data for external diode 2 00h page 28 24h r external diode 2 data low byte stores the fractional data for external diode 2 00h page 28 table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 25 revision 1.0 (04-29-10) datasheet 25h r/w external diode 1 beta configuration stores the beta compensation circuitry settings for external diode 1 08h page 38 26h r/w external diode 2 beta configuration stores the beta compensation circuitry settings for external diode 2 08h page 38 29h r internal diode data low byte stores the fractional data for the internal diode 00h page 28 2ah r external diode 3 high byte stores the integer data for external diode 3 00h page 28 2bh r external diode 3 low byte stores the fractional data for external diode 3 00h page 28 2ch r/w external diode 3 high limit high byte stores the integer portion of the high limit for external diode 3 55h (85c) page 31 2dh r/w external diode 3 low limit high byte stores the integer portion of the low limit for external diode 3 00h (0c) page 31 2eh r/w external diode 3 high limit low byte stores the fractional portion of the high limit for external diode 3 00h page 31 2fh r/w external diode 3 low limit low byte stores the fractional portion of the low limit for external diode 3 00h page 31 30h r/w external diode 3 therm limit stores the 8-bit critical temperature limit for external diode 3 55h (85c) page 35 32h r hottest diode high byte stores the integer data for the hottest temperature 80h page 39 33h r hottest diode low byte stores the fractional data for the hottest temperature 00h page 39 34h r-c hottest status status bits indicating which external diode is hottest 00h page 39 35h r-c high limit status status bits for the high limits 00h page 39 36h r-c low limit status status bits for the low limits 00h page 40 37h r therm limit status status bits for the therm limits 00h page 41 39h r/w rec configuration controls rec for all channels 00h page 42 3ah r/w hottest config controls which external diode channels are used in the ?hottest of ?comparison 00h page 42 3bh r/w channel config controls which channels are enabled 0eh (-1) 00h (-2) page 42 40h r/w filter control controls t he digital filter setting for the external diode 1 channel 00h page 43 41h r external diode 4 data high byte stores the integer data for the external diode 4 channel 00h page 28 table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 26 smsc emc1438 datasheet 42h r external diode 4 data low byte stores the fractional data for the external diode 4 channel 00h page 28 43h r external diode 5 data high byte stores the integer data for the external diode 5 channel 00h page 28 44h r external diode 5 data low byte stores the fractional data for the external diode 5 channel 00h page 28 45h r external diode 6 data high byte stores the integer data for the external diode 6 channel 00h page 28 46h r external diode 6 data low byte stores the fractional data for the external diode 6 channel 00h page 28 47h r external diode 7 data high byte stores the integer data for the external diode 7 channel 00h page 28 48h r external diode 7 data low byte stores the fractional data for the external diode 7 channel 00h page 28 50h r/w external diode 4 high limit high byte stores the integer data for the high limit for the external diode 4 channel 55h (85c) page 31 51h r/w external diode 4 low limit high byte stores the integer data for the low limit for the external diode 4 channel 00h (0c) page 31 52h r/w external diode 4 high limit low byte stores the fractional data for the low limit for the external diode 4 channel 00h page 31 53h r/w external diode 4 low limit low byte stores the fractional data for the low limit for the external diode 4 channel 00h page 31 54h r/w external diode 5 high limit high byte stores the integer data for the high limit for the external diode 5 channel 55h (85c) page 31 55h r/w external diode 5 low limit high byte stores the integer data for the low limit for the external diode 5 channel 00h (0c) page 31 56h r/w external diode 5 high limit low byte stores the fractional data for the low limit for the external diode 5 channel 00h page 31 57h r/w external diode 5 low limit low byte stores the fractional data for the low limit for the external diode 5 channel 00h page 31 58h r/w external diode 6 high limit high byte stores the integer data for the high limit for the external diode 6 channel 55h (85c) page 31 59h r/w external diode 6 low limit high byte stores the integer data for the low limit for the external diode 6 channel 00h (0c) page 31 table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 27 revision 1.0 (04-29-10) datasheet 5ah r/w external diode 6 high limit low byte stores the fractional data for the low limit for the external diode 6 channel 00h (0c) page 31 5bh r/w external diode 6 low limit low byte stores the fractional data for the low limit for the external diode 6 channel 00h (0c) page 31 5ch r/w external diode 7 high limit high byte stores the integer data for the high limit for the external diode 7 channel 55h (85c) page 31 5dh r/w external diode 7 low limit high byte stores the integer data for the low limit for the external diode 7 channel 00h (0c) page 31 5eh r/w external diode 7 high limit low byte stores the fractional data for the low limit for the external diode 7 channel 00h page 31 5fh r/w external diode 7 low limit low byte stores the fractional data for the low limit for the external diode 7 channel 00h page 31 64h r/w external diode 4 therm limit stores the 8-bit critical temperature limit for external diode 4 55h (85c) page 31 65h r/w external diode 5 therm limit stores the 8-bit critical temperature limit for external diode 5 55h (85c) page 31 66h r/w external diode 6 therm limit stores the 8-bit critical temperature limit for external diode 6 55h (85c) page 31 67h r/w external diode 7 therm limit stores the 8-bit critical temperature limit for external diode 7 55h (85c) page 31 71h r/w external diode 4 beta configuration stores the beta compensation circuitry settings for external diode 4 08h page 38 72h r/w external diode 6 beta configuration stores the beta compensation circuitry settings for external diode 6 08h page 38 fdh r product id stores a fixed value that identifies each product 59h page 44 feh r manufacturer id stores a fixed value that represents smsc 5dh page 44 ffh r revision stores a fixed value that represents the revision number 00h page 44 table 6.1 register set in hexadecimal order (continued) register address r/w register name function default value page
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 28 smsc emc1438 datasheet 6.1 data read interlock when any temperature channel high byte register is read, the corresponding low byte is copied into an internal ?shadow? register. the user is free to r ead the low byte at any time and be guaranteed that it will correspond to the previously read high byte. regardless if the low byte is read or not, reading from the same high byte register again will auto matically refresh this stored low byte data. 6.2 temperature data registers table 6.2 temperature data registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 00h r internal diode high byte sign 64 32 16 8 4 2 1 00h 29h r internal diode low byte 0.5 0.25 0.125 - - - - - 00h 01h r external diode 1 high byte sign 64 32 16 8 4 2 1 00h 10h r external diode 1 low byte 0.5 0.25 0.125 - - - - - 00h 23h r external diode 2 high byte sign 64 32 16 8 4 2 1 00h 24h r external diode 2 low byte 0.5 0.25 0.125 - - - - - 00h 2ah r external diode 3 high byte sign 64 32 16 8 4 2 1 00h 2bh r external diode 3 low byte 0.5 0.25 0.125 - - - - - 00h 41h r external diode 4 high byte sign 64 32 16 8 4 2 1 00h 42h r external diode 4 low byte 0.5 0.25 0.125 - - - - - 00h 43h r external diode 5 high byte sign 64 32 16 8 4 2 1 00h 44h r external diode 5 low byte 0.5 0.25 0.125 - - - - - 00h 45h r external diode 6 high byte sign 64 32 16 8 4 2 1 00h 46h r external diode 6 low byte 0.5 0.25 0.125 - - - - - 00h 47h r external diode 7 high byte sign 64 32 16 8 4 2 1 00h 48h r external diode 7 low byte 0.5 0.25 0.125 - - - - - 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 29 revision 1.0 (04-29-10) datasheet all temperatures are stored as an 11-bit value with the high by te representing the integer value and the low byte representing the fractional value left justified to occupy the msbits. the data format is standard 2?s complement from -64c to 127.875c as shown in table 6.3 . 6.3 status register the status register reports general error conditions (see section 5.3.1, "status" ). bit 7 - busy - this bit indicates that the adc is currently converting. this bit does not cause the alert pin to be asserted. this bit is set and cleared by the device. bit 6 - hottest - this bit is set if the rem_ hot bit is set and the hottest channel changes (see section 5.3.3, "?hottest of? comparison" ). this bit is cleared when this register is read. bit 4 - high - this bit is set when any one of the temperature channel s meets or exceeds its programmable high limit criteria (see section 5.3.2, "limits and fault queues" ). if the alert pin is in interrupt mode, reading from the high limit status re gister will clear this bit if the error condition has been removed. if the alert pin is in comparator mode, this bit is cleared when the alert pin is deasserted (see section 5.4.2, "alert pin comparator mode" ). bit 3 - low - this bit is set when any one of the temperature channels drops below its programmed low limit criteria (see section 5.3.2, "limits and fault queues" ). reading from the low limit status register will clear this bit if the error condition has been removed. table 6.3 temperature data format temperature (c) binary hex (as read by registers) diode fault 1000_0000_000b 80_00h -64 1100_0000_000b c0_00h -63.875 1100_0000_001b c0_20h -1 1111_1111_000b ff_00h -0.125 1111_1111_111b ff_e0h 0 0000_0000_000b 00_00h 0.125 0000_0000_001b 00_20h 1 0000_0001_000b 01_00h 63 0011_1111_000b 3f_00h 64 0100_0000_000b 40_00h 127 0111_1111_000b 7f_00h 127.875 0111_1111_111b 7f_e0h table 6.4 status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 02h r status busy hottest - high low fault therm - 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 30 smsc emc1438 datasheet bit 2 - fault - this bit is asserted when a diode fault is detected on any one of the external diode channels (see section 5.3.4, "diode faults" ). reading from the external diode fault register will clear this bit if the error condition has been removed. bit 1 - therm - this bit is set when any one of the external diode channels meets or exceeds its therm limit criteria (see section 5.3.2, "limits and fault queues" ). 6.4 configuration register the configuration register controls the basic operati on of the device. this register is fully accessible at either address. bit 7 - mask_all - masks the alert pin from asserting. ? ?0? - the alert pin is not masked. if an y of the appropriate status bits are set, the alert pin will be asserted. ? ?1? (default) - the alert pin is masked. it will not be asserted for any interrupt condition, although it may be asserted if the alert pin is configured to operate in comparator mode (see section 5.4.2, "alert pin comparator mode" ). the status registers will be updated normally. bit 6 - standby - enables the standby state without using the standby pin (see section 5.2, "power states" ). note: the standby pin has no effect on this bit. if asserted, it will not set this bit to ?1?. ? ?0? (default) - the emc1438 is in the active state if the standby pin is not asserted. ? ?1? - the emc1438 is in the standby state. bit 5 - alert/comp - controls the operation of the alert pin. ? ?0? (default) - the alert pin acts in interrupt mode as described in section 5.4.1 . ? ?1? - the alert pin acts in comparator mode as described in section 5.4.2 . in this mode the mask_all bit is ignored. bit 1 - davg_dis - disables the dynamic averaging feature on all temperature channels (see section 5.6.5, "dynamic averaging" ). ? ?0? (default) - the dynamic averaging feature is enabled. all temperature c hannels will be converted with an averaging factor that is based on the conversion rate as shown in ta b l e 5 . 1 . ? ?1? - the dynamic averaging featur e is disabled. all temperature channels will be converted with a maximum averaging factor of 1x (e quivalent to 11-bit conversion). for higher conversion rates (i.e. more conversions per second), this aver aging factor will be reduced as shown in ta b l e 5 . 1 . table 6.5 configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 03h r/w config mask_ all standby alert/ comp - --davg_ dis -80h 09h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 31 revision 1.0 (04-29-10) datasheet 6.5 conversion rate register the conversion rate register controls how ofte n the temperature measurement channels are updated and compared against the limits. this register is fully accessible at either register address. bits 3-0 - conv[3:0] - determines the conversion rate as shown in ta b l e 6 . 7 . the actual conversion rate for continuous conver sions will depend on the number of diode channels enabled and is shown in table 6.8 . 6.6 temperature limit registers table 6.6 conversion rate register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 04h r/w conversion rate - - - - conv[2:0] 06h (4/sec) 0ah table 6.7 conversion rate conv[2:0] conversions / second 210 100 1 101 2 1 1 0 4 (default) 1 1 1 continuous all others 4 table 6.8 maximum conversion rate per temperature channels number of external diode channels max conversion rate 4 15 / sec 5 13 / sec 6 11 / sec 7 10 / sec table 6.9 temperature limit registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 05h r/w internal diode high limit sign 64 32 16 8 4 2 1 55h (85c) 0bh
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 32 smsc emc1438 datasheet 06h r/w internal diode low limit sign 64 32 16 8 4 2 1 00h (0c) 0ch 07h r/w external diode 1 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 0dh 13h r/w external diode 1 high limit low byte 0.5 0.25 0.125 - - - - - 00h 08h r/w external diode 1 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 0eh 14h r/w external diode 1 low limit low byte 0.5 0.25 0.125 - - - - - 00h 15h r/w external diode 2 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 16h r/w external diode 2 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 17h r/w external diode 2 high limit low byte 0.5 0.25 0.125 - - - - - 00h 18h r/w external diode 2 low limit low byte 0.5 0.25 0.125 - - - - - 00h 2ch r/w external diode 3 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 2dh r/w external diode 3 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 2eh r/w external diode 3 high limit low byte 0.5 0.25 0.125 - - - - - 00h table 6.9 temperature limit registers (continued) addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 33 revision 1.0 (04-29-10) datasheet 2fh r/w external diode 3 low limit low byte 0.5 0.25 0.125 - - - - - 00h 50h r/w external diode 4 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 51h r/w external diode 4 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 52h r/w external diode 4 high limit low byte 0.5 0.25 0.125 - - - - - 00h 53h r/w external diode 4 low limit low byte 0.5 0.25 0.125 - - - - - 00h 54h r/w external diode 5 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 55h r/w external diode 5 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 56h r/w external diode 5 high limit low byte 0.5 0.25 0.125 - - - - - 00h 57h r/w external diode 5 low limit low byte 0.5 0.25 0.125 - - - - - 00h 58h r/w external diode 6 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 59h r/w external diode 6 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 5ah r/w external diode 6 high limit low byte 0.5 0.25 0.125 - - - - - 00h table 6.9 temperature limit registers (continued) addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 34 smsc emc1438 datasheet the device contains both high and low limits for al l temperature channels. if the measured temperature meets or exceeds the high limit, the co rresponding status bits are set (see section 5.3.1, "status" ) and the alert pin may be asserted (see section 5.4, "alert output" ). likewise, if the measured temperature is less than the low limit, the co rresponding status bits are set and the alert pin may be asserted. the limit registers with multiple register addr esses are fully accessible at either address. when the device is in the standby state, updating th e limit registers will have no effect until the next conversion cycle occurs. this can be initiated via a write to the one shot register (see section 6.7, "one shot register" ). 6.7 one shot register the one shot register is used to initiate a one shot command. writing to the one shot register, when the device is in the standby state (see section 5.2, "power states" ) and the busy bit (see section 6.3, "status register" ) is ?0?, will immediately cause the adc to update all temperature measurements. writing to the one shot register while the devic e is in the active state will have no effect. 5bh r/w external diode 6 low limit low byte 0.5 0.25 0.125 - - - - - 00h 5ch r/w external diode 7 high limit high byte sign 64 32 16 8 4 2 1 55h (85c) 5dh r/w external diode 7 low limit high byte sign 64 32 16 8 4 2 1 00h (0c) 5eh r/w external diode 7 high limit low byte 0.5 0.25 0.125 - - - - - 00h 5fh r/w external diode 7 low limit low byte 0.5 0.25 0.125 - - - - - 00h table 6.10 one shot register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 0fh w one shot writing to this register in standby initiates a single conversion cycle. data is not stored and always reads 00h 00h table 6.9 temperature limit registers (continued) addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 35 revision 1.0 (04-29-10) datasheet 6.8 therm hysteresis register the therm hysteresis is used in conjunction with the therm limit registers to set the therm status bits (see section 5.5, "therm output" ). in addition, the therm h ysteresis register is used with the high limit registers when the alert pin is configured to act as a comparator (see section 5.4.2, "alert pin comparator mode" ). 6.9 therm limit registers the therm limit registers are used to set the therm status bits and assert the therm pin (see section 5.5, "therm output" ). table 6.11 therm hysteresis register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 21h r/w therm hysteresis -643216 8 421 0ah (10c) table 6.12 therm limit registers addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 19h r/w external diode 1 therm limit sign 64 32 16 8 4 2 1 55h (85c) 1ah r/w external diode 2 therm limit sign 64 32 16 8 4 2 1 55h (85c) 20h r/w internal diode therm limit sign 64 32 16 8 4 2 1 55h (85c) 30h r/w external diode 3 therm limit sign 64 32 16 8 4 2 1 55h (85c) 64h r/w external diode 4 therm limit sign 64 32 16 8 4 2 1 55h (85c) 65h r/w external diode 5 therm limit sign 64 32 16 8 4 2 1 55h (85c) 66h r/w external diode 6 therm limit sign 64 32 16 8 4 2 1 55h (85c) 67h r/w external diode 7 therm limit sign 64 32 16 8 4 2 1 55h (85c)
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 36 smsc emc1438 datasheet 6.10 external diode fault register the external diode fault register contains the stat us bits that are set wh en a temperature channel meets the diode fault criteria (see section 5.3.4, "diode faults" ). if any of these bits are set, the fault status bit in the status register is set. reading fr om the external diode fault register will clear all bits if the error condition has been removed. readin g from the register will al so clear the fault status bit in the status register. the alert pin, if configured in interrupt mode, may be set if any of these status bits are set (see section 5.4, "alert output" ). bit 7 - e7flt - this bit is set if the external diode 7 channel reported a diode fault. bit 6 - e6flt - this bit is set if the external diode 6 channel reported a diode fault. bit 5 - e5flt - this bit is set if the external diode 5 channel reported a diode fault. bit 4 - e4flt - this bit is set if the external diode 4 channel reported a diode fault. bit 3 - e3flt - this bit is set if the external diode 3 channel reported a diode fault. bit 2 - e2flt - this bit is set if the external diode 2 channel reported a diode fault. bit 1 - e1flt - this bit is set if the external diode 1 channel reported a diode fault. 6.11 channel interrupt mask register the channel interrupt mask register controls indi vidual channel masking. when a channel is masked, the alert pin will not be asserted when the masked channel reads a diode fault or out of limit error. bits 7-1 - ex_msk - prevents the alert pin from being asserted when the external diode x channel is out of limit or reports a diode fault. if the ext6_apd bit is not set (see section 6.21, "channel configuration register" ), the ext7_msk bit is ignored. likewise, if the ext4_apd bit is not set, then the ext5_msk bit is ignored, and if the ext2_apd bit is not set (see section 6.21 ), the ext3_msk bit is ignored. ? ?0? (default) - the external diode x channel will cause the alert pin to be asserted if it is out of limit or reports a diode fault. ? ?1? - the external diode x channel will not cause the alert pin to be asserted if it is out of limit or reports a diode fault. bit 0 - int_msk - prevents the alert pin from being asserted when the internal diode temperature is out of limit. ? ?0? (default) - the internal diode channel will cause the alert pin to be asserted if it is out of limit. table 6.13 external diode fault register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1bh r-c external diode fault e7flt e6flt e5flt e4flt e3flt e2flt e1flt - 00h table 6.14 channel interrupt mask register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1fh r/w channel mask e7_ msk e6_ msk e5_ msk e4_ msk e3_ msk e2_ msk e1_ msk int_ msk 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 37 revision 1.0 (04-29-10) datasheet ? ?1? - the internal diode channel will not cause the alert pin to be asserted if it is out of limit. 6.12 consecutive alert register the consecutive alert register determines how many times an out-of-limit error or diode fault must be detected in consecut ive measurements before the stat us registers are asserted (see section 5.3.2, "limits and fault queues" ). bit 7 - timeout - determines whether the smbus timeout function is enabled. ? ?0? (default) - the smbus timeout and idle timeout features are disabled. the smclk line can be held low indefinitely without the de vice resetting its smbus protocol. ? ?1? - the smbus timeout feature is enabled. if the smclk line is held low for more than 30ms, the device will reset the smbus protocol. the idle timeout is also enabled. if both the smclk and smdata lines are held high for longer than 150us, the device will reset the smbus protocol. bits 6-4 ctherm[2:0] - determines the number of consecutive measurements that must exceed the corresponding therm limit before the corresponding therm limit status bit is set and the therm pin is asserted (if enabled for the channel). all temperature channels use this value to set the respective counters. the bits are decoded as shown in ta b l e 6 . 1 6 . the default setting is 4 consecutive out of limit conversions. bits 3-1 - calrt[2:0] - determine the number of c onsecutive measurements that must have an out of limit condition or diode fault befor e the applicable status bits are asserted. all temperature channels use this value to set the respective counters. the bits are decoded as shown in ta b l e 6 . 1 6 . the default setting is 1 consecutive out-of-limit conversion or diode fault. application note: if one of the fault queues is not cleared and the calrt[2:0] or ctherm[2:0] bits are updated, the update won?t take effect until the fault queue is cleared. all the fault queues are independent so those that are empty will be updated immediately. application note: if the alert pin is configured in comparator m ode, these bits are ignored for low temperature out-of-limit and diode faul ts. the value used is one occurrence. table 6.15 consecutive alert register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 22h r/w consecutive alert time out ctherm[2:0] calrt[2:0] - 70h table 6.16 consecutive alert settings 210 number of consecutive out of limit measurements / diode faults 0 0 0 1 (default for calrt[2:0]) 001 2 011 3 1 1 1 4 (default for ctherm[2:0]) all others 1 (calrt[2:0]), 4 (ctherm[2:0])
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 38 smsc emc1438 datasheet 6.13 beta configuration register these registers are used to set t he beta compensation factor that is used for the external diode channels. bit 3 - autox - enables the beta compen sation factor autodetection function. ? ?0? - the beta compensation factor autodetection circuitry is disabled. the external diode will always use the beta compensation factor set by the betax[2:0] bits. ? ?1? (default) - the beta compensat ion factor autodetection circuitr y is enabled. at the beginning of every conversion, the optimal beta compensatio n factor setting will be determined and applied. the betax[2:0] bits will be automatically updated to indicate the current setting. bit 2-0 - betax[2:0] - these bits al ways reflect the current beta configuration settings. these bits will be updated automatically and writing to these bits will have no effect. table 6.17 beta configuration register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 25h r/w external diode 1 beta configuration - - - - auto1 beta1[2:0] 08h 26h r/w external diode 2 beta configuration - - - - auto2 beta2[2:0] 08h 71h r/w external diode 4 beta configuration - - - - auto4 beta4[2:0] 08h 72h r/w external diode 6 beta configuration - - - - auto6 beta6[2:0] 08h table 6.18 beta compensation look up table betax[2:0] minimum beta 210 000 < 0.08 001 < 0.111 010 < 0.176 011 < 0.29 100 < 0.48 101 < 0.9 110 < 2.33 1 1 1 disabled
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 39 revision 1.0 (04-29-10) datasheet 6.14 hottest temperature registers the hottest temperature registers store the measur ed hottest temperature of all the selected external diode channels (see section 5.3.3, "?hott est of? comparison" ). if no external diodes are selected, the high byte register will read 80h. the data forma t is the same as the temperature channels. 6.15 hottest temperature status register the hottest temperature status re gister flags which external di ode temperature is hottest (see section 5.3.3, "?hottest of? comparison" ). bit 7 - ext7 - the external diode 7 channel is the hottest. bit 6 - ext6 - the external diode 6 channel is the hottest. bit 4 - ext5 - the external diode 5 channel is the hottest. bit 3 - ext4 - the external diode 4 channel is the hottest. bit 3 - ext3 - the external diode 3 channel is the hottest. bit 2 - ext2 - the external diode 2 channel is the hottest. bit 1 - ext1 - the external diode 1 channel is the hottest. bit 0 - int - the internal diode channel is the hottest. 6.16 high limit status register table 6.19 hottest temperature registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 32h r hottest temperature high byte sign 64 32 16 8 4 2 1 80h 33h r hottest temperature low byte 0.5 0.25 0.125 - - - - - 00h table 6.20 hottest temperature register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 34h r hottest temperature status ext7 ext6 ext5 ext4 ext3 ext2 ext1 int 00h table 6.21 high limit status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 35h r-c high limit status e7 high e6 high e5 high e4 high e3 high e2 high e1 high i high 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 40 smsc emc1438 datasheet the high limit status register contains the status bits that are set when a temperature channel meets the high limit criteria (see section 5.3.2, "limits and fault queues" ). if any of these bits are set, the high status bit in the status register is set. if the alert pin is in interrupt mode, reading from the high limit status register will clear all bits if th e error condition has been removed, and reading from the register will also clear the high status bit in the status register. if the alert pin is in comparator mode, these bits are cleared when the alert pin is deasserted (see section 5.4.2, "alert pin comparator mode" ). the alert pin may be set if any of these status bits are set (see section 5.4, "alert output" ). bit 7 - e7high - this bit is set when the external diode 7 channel meets or exceeds its programmed high limit. bit 6 - e6high - this bit is set when the external diode 6 channel meets or exceeds its programmed high limit. bit 5 - e5high - this bit is set when the external diode 5 channel meets or exceeds its programmed high limit. bit 4 - e4high - this bit is set when the external diode 4 channel meets or exceeds its programmed high limit. bit 3 - e3high - this bit is set when the external diode 3 channel meets or exceeds its programmed high limit. bit 2 - e2high - this bit is set when the external diode 2 channel meets or exceeds its programmed high limit. bit 1 - e1high - this bit is set when the external diode 1 channel meets or exceeds its programmed high limit. bit 0 - ihigh - this bit is set when the internal diode channel meets or exceeds its programmed high limit. 6.17 low limit status register the low limit status register contains the status bits that are set when a temperature channel meets the low limit criteria (see section 5.3.2, "limits and fault queues" ). if any of these bits are set, the low status bit in the status register is set. reading from the low limit status register will clear all bits if the error condition has been removed. readi ng from the register will also clear the low status bit in the status register. the alert pin, if configured in interrupt mode, may be set if any of these status bits are set (see section 5.4, "alert output" ). bit 7 - e7low - this bit is set when the external diode 7 channel drops below its programmed low limit. bit 6 - e6low - this bit is set when the external diode 6 channel drops below its programmed low limit. bit 5 - e5low - this bit is set when the external diode 5 channel drops below its programmed low limit. table 6.22 low limit status register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 36h r-c low limit status e7 low e6 low e5 low e4 low e3 low e2 low e1 low ilow 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 41 revision 1.0 (04-29-10) datasheet bit 4 - e4low - this bit is set when the external diode 4 channel drops below its programmed low limit. bit 3 - e3low - this bit is set when the external diode 3 channel drops below its programmed low limit. bit 2 - e2low - this bit is set when the external diode 2 channel drops below its programmed low limit. bit 1 - e1low - this bit is set when the external diode 1 channel drops below its programmed low limit. bit 0 - ilow - this bit is set when the internal diode channel drops below its programmed low limit. 6.18 therm limit status register the therm limit status register contains the stat us bits that are set when a temperature channel meets the therm limit criteria (see section 5.3.2, "limits and fault queues" ). if any of these bits are set, the therm status bit in the status register is set. reading fr om the therm limit status register will not clear the status bits. once the temperature drops below the therm limit minus the therm hysteresis, the corresponding status bits will be aut omatically cleared. the therm bit in the status register will be cleared when all individual channel therm bits are cleared. bit 7 - e7therm - this bit is set when the external diode 7 channel meets or exceeds its programmed therm limit. bit 6 - e6therm - this bit is set when the external diode 6 channel meets or exceeds its programmed therm limit. bit 5 - e5therm - this bit is set when the external diode 5 channel meets or exceeds its programmed therm limit. bit 4 - e4therm - this bit is set when the external diode 4 channel meets or exceeds its programmed therm limit. bit 3 - e3therm - this bit is set when the external diode 3 channel meets or exceeds its programmed therm limit. bit 2 - e2therm - this bit is set when the external diode 2 channel meets or exceeds its programmed therm limit. bit 1 - e1therm - this bit is set when the external diode 1 channel meets or exceeds its programmed therm limit. bit 0 - itherm - this bit is set when the internal diode channel meets or exceeds its programmed therm limit. table 6.23 therm limit status register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 37h r-c therm limit status e7 therm e6 therm e5 therm e4 therm e3 therm e2 therm e1 therm i therm 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 42 smsc emc1438 datasheet 6.19 rec configuration register the rec control register controls the resistance error correction circuitry for each of the external diode channels. bits 7 - 0 - ex_rec_n - disables the resistance error correction (rec) fo r the external diode x channel. ? ?0? (default) - rec is enabled. ? ?1? - rec is disabled. 6.20 hottest configuration register the hottest configuration register determines wh ich external diode channels (if any) are compared during the ?hottest of? comparison that is automatically performed at the end of every conversion cycle (see section 5.3.3, "?ho ttest of? comparison" ). bits 7 - 0 - exhot - controls whether the external diode x temperature data is compared during the ?hottest of? comparison. ? ?0? (default) - the external diode x channel is not compared during the ?hottest of? comparison. ? ?1? - the external diode x channel temperature da ta is compared to all other indicated channels during the ?hottest of? comparison. bit 0 - ihot - controls whether the internal diode temperature da ta is compared during the ?hottest of? comparison. ? ?0? (default) - the internal diode channel is not compared during the ?hottest of? comparison. ? ?1? - the internal diode channel temperature data is compared to all other indicated channels during the ?hottest of? comparison. 6.21 channel configuration register table 6.24 rec configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 39h r/w rec config e7 rec_n e6_ rec_n e5_ rec_n e4_ rec_n e3_ rec_n e2_ rec_n e1_ rec_n -00h table 6.25 hottest configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 3ah r/w hottest config e7hot e6hot e5hot e4hot e3hot e2hot e1hot ihot 00h table 6.26 channel configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 3bh r/w channel config rem_ hot - - - ext6_ apd ext4_ apd ext2_ apd -0eh (-1) 00h (-2)
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 43 revision 1.0 (04-29-10) datasheet the channel configuration register determines which external diode channels are active in the device. bit 7 - rem_hot - enables circuitry that will re member the last temper ature channel that was determined to be the hottest and flag an error if the hottest temperatur e channel changes (see section 5.3.3, "?hottest of? comparison" ). ? ?0? (default) - the hottest stat us bit will not be asserted if the hottest temperature channel changes. ? ?1? - if the hottest temperature channel chang es, the hottest status bit will be asserted. bit 3 - ext6_apd - enables the dp6 / dn7 and dn6 / dp7 pins to support two anti-parallel diode connections versus a single diode connection. ? ?0? (default - emc1438-2) - the dp6 / dn7 and dn6 / dp7 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 6). ? ?1? (default - emc1438-1) - the dp6 / dn7 and dn6 / dp7 pins support two anti-parallel diode connections (external diode 6 and external diode 7). bit 2 - ext4_apd - enables the dp4 / dn5 and dn4 / dp5 pins to support two anti-parallel diode connections versus a single diode connection. ? ?0? (default - emc1438-2) - the dp4 / dn5 and dn4 / dp5 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 4). ? ?1? (default - emc1438-1) - the dp4 / dn5 and dn4 / dp5 pins support two anti-parallel diode connections (external diode 4 and external diode 5). bit 1 - ext2_apd - enables the dp2 / dn3 and dn2 / dp3 pins to support two anti-parallel diode connections versus a single diode connection. ? ?0? (default - emc1438-2) - the dp2 / dn3 and dn2 / dp3 pins do not support two anti-parallel diode connections. the pins will only monitor a single external diode (external diode 2). ? ?1? (default - emc1438-1) - the dp2 / dn3 and dn2 / dp3 pins support two anti-parallel diode connections (external diode 2 and external diode 3). 6.22 filter control register the filter configuration register controls the digital filter on the external diode channels (see section 5.6.3, "digital averaging" ). bits 7 - 0 - avgx_en - control the digital averaging t hat is applied to the external diode x temperature measurements. ? ?0? (default) - digital averaging is disabled. ? ?1? - digital averaging is enabled as a 4x running average for the external diode x channel. bit 5 - this bit is part of the test mux encoding but is ignored. table 6.27 filter control register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 40h r/w filter control avg7_ en avg6_ en avg5_ en avg4_ en avg3_ en avg2_ en avg1_ en - 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 44 smsc emc1438 datasheet 6.23 product id register the product id register holds a unique value that identifies the device. 6.24 manufacturer id register (feh) the manufacturer id register holds an 8-bit word that identifies smsc. 6.25 revision register (ffh) the revision register contains an 8-bit word that identifies the die revision. table 6.28 product id register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default fdh r product id 0 1 0 1 1 0 0 1 59h table 6.29 manufacturer id register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default feh r manufacturer id 01011101 5dh table 6.30 revision register addr. r/w register b7 b6 b5 b4 b3 b2 b1 b0 default ffh r revision00000000 00h
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 45 revision 1.0 (04-29-10) datasheet chapter 7 package information 7.1 emc1438 package drawing figure 7.1 16-pin qfn 4mm x 4mm package drawing
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 46 smsc emc1438 datasheet figure 7.2 16-pin qfn 4 mm x 4mm pcb footprint figure 7.3 16-pin qfn 4mm x 4mm package dimensions
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet smsc emc1438 47 revision 1.0 (04-29-10) datasheet 7.2 package markings 7.2.1 emc1438 (16-pi n 4mm x 4mm qfn) figure 7.4 emc1438 package marking bottom bottom marking not allowed line: 1 ? smsc logo without circled (r) symbol line: 2 ? device id, version line: 3 ? last 7 digits of lot number line: 4 ? revision and country code (rcc) lines 1 to 3: center horizontal alignment line 4: left horizontal alignment pb-free/green symbol (matte sn) 0.41 3x 0.56 top e3 pin 1 1438 cc r 123456a - v e
1c multiple temperature sensor with hardware controlled standby & hottest of multiple zones datasheet revision 1.0 (04-29-10) 48 smsc emc1438 datasheet chapter 8 datasheet revision history table 8.1 customer revision history revision level and date section/figure/entry correction rev. 1.0 rev. 1.0 (04-29-10) datasheet release

▲Up To Search▲

Price & Availability of EMC1438-2-AP-TR

	To Download EMC1438-2-AP-TR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .