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| EMC1403/EMC1404 1C Temperature Sensor with Beta Compensation PRODUCT FEATURES GENERAL DESCRIPTION The EMC1403 and EMC1404 are high accuracy, low cost, System Management Bus (SMBus) temperature sensors. Advanced features such as Resistance Error Correction (REC), Beta Compensation (to support 90nm and 65nm CPU diodes) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications. Each device provides 1 accuracy for external diode temperatures and 2C accuracy for the internal diode temperature. The EMC1403 monitors three temperature channels (two external and one internal). The EMC1404 monitors four temperature channels (three external and one internal). Resistance Error Correction automatically eliminates the temperature error caused by series resistance allowing greater flexibility in routing thermal diodes. Beta Compensation eliminates temperature errors caused by low, variable beta transistors common in today's fine geometry processors. The automatic beta detection feature monitors each external diode/transistor and determines the optimum sensor settings for accurate temperature measurements regardless of processor technology. This frees the user from providing unique sensor configurations for each temperature monitoring application. These advanced features plus 1C measurement accuracy provide a low-cost, highly flexible and accurate solution for critical temperature monitoring applications. APPLICATIONS Notebook Computers Desktop Computers Industrial Embedded applications Datasheet FEATURES Support for 90nm and 65nm CPU diodes Automatically determines external diode type and optimal settings Resistance Error Correction External Temperature Monitors -- 1C Accuracy (60C < TDIODE < 100C) -- 0.125C Resolution -- Anti-parallel diodes for extra diode support Internal Temperature Monitor -- 2C accuracy 3.3V Supply Voltage Programmable temperature limits for ALERT and THERM Small 10-lead MSOP Lead-free RoHS Compliant Package EMC1403/EMC1404 PIN DESCRIPTION VDD DP1 DN1 DP2 DN2 1 2 3 4 5 10 9 8 7 6 SMCLK SMDATA ALERT THERM GND SMSC EMC1403/EMC1404 DATASHEET Revision 1.16 (03-15-07) 1C Temperature Sensor with Beta Compensation Datasheet ORDER NUMBERS: EMC1403-1-AIZL-TR FOR 10 PIN, MSOP LEAD-FREE ROHS COMPLIANT PACKAGE EMC1404-1-AIZL-TR FOR 10 PIN, MSOP LEAD-FREE ROHS COMPLIANT PACKAGE Note: See Table 1.1, "Part Selection" for SMBus addressing options. 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright (c) 2007 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where 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 literature, 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 Standard Microsystems Corporation ("SMSC"). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE 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 OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Revision 1.16 (03-15-07) 2 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table of Contents Chapter 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Chapter 3 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 3.2 3.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 SMBus Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Chapter 4 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 System Management Bus Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receive Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 13 13 13 13 14 14 Chapter 5 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.1 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.1 Conversion Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.2 Dynamic Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . THERM Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALERT Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.1 ALERT Pin Interrupt Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3.2 ALERT Pin Comparator Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Beta Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resistance Error Correction (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Programmable External Diode Ideality Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diode Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Consecutive Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Measurement Results and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-parallel Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Diode Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 16 16 18 18 18 18 18 19 19 19 19 20 21 22 23 23 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 Chapter 6 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 Data Read Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conversion Rate Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scratchpad Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Therm Limit Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Diode Fault Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 28 28 29 29 30 31 33 33 33 34 34 SMSC EMC1403/EMC1404 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Beta Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Diode Ideality Factor Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . THERM Limit Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Filter Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMSC ID Register (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision Register (FFh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 36 37 38 39 39 40 40 41 41 Chapter 7 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Revision 1.16 (03-15-07) 4 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet List of Figures Figure 4.1 Figure 5.1 Figure 5.2 Figure 5.3 Figure 5.4 Figure 5.5 Figure 5.6 Figure 7.1 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Diagram for EMC1403 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Diagram for EMC1404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Filter Impulse Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diode Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 PIN MSOP / TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 15 16 20 21 22 24 42 SMSC EMC1403/EMC1404 5 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet List of Tables Table 1.1 Part Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2.1 EMC1403 and EMC1404 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 3.3 SMBus Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 4.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 4.3 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.4 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.5 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 4.6 Alert Response Address Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 5.1 Supply Current vs. Conversion Rate for EMC1403 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 5.2 Supply Current vs. Conversion Rate for EMC1404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 5.3 EMC1403 and EMC1404 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 6.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 6.2 Temperature Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Table 6.3 Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Table 6.4 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Table 6.5 Conversion Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 6.6 Conversion Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Table 6.7 Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Table 6.8 Scratchpad Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 6.9 One Shot Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 6.10 Therm Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 6.11 External Diode Fault Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 6.12 Channel Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 6.13 Consecutive ALERT Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Table 6.14 Consecutive Alert / THERM Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Table 6.15 Beta Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Table 6.16 CPU Beta Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Table 6.17 Ideality Configuration Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Table 6.18 Ideality Factor Look-Up Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Table 6.19 High Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Table 6.20 Low Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 6.21 THERM Limit Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 6.22 Filter Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 6.23 Filter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 6.24 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 6.25 Manufacturer ID Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 6.26 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Revision 1.16 (03-15-07) 6 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 1 Block Diagram VDD EMC1403/04 Switching Current Conversion Rate Register Low Limit Registers DP1 Limit Comparator High Limit Registers SMBus Interface THERM Limit Register THERM Hysteresis Register Internal Temp Diode Configuration Register Status Registers Interupt Masking SMCLK SMDATA ALERT THERM GND Digital Mux DN1 DP2 Anti-parallel diodes Analog Mux ADC External Temperature Register(s) DN2 Internal Temperature Register 1.1 Part Selection The EMC1403 and EMC1404 device configuration is highlighted below. Table 1.1 Part Selection FUNCTIONALITY DIODE 2 DEFAULT CONFIGURATION Detect Diode w/ REC enabled PART NUMBER EMC1403 - 1 SMBUS ADDRESS 100_1100b EXTERNAL DIODES 2 DIODE 1 DEFAULT CONFIGURATION Detect Diode w/ REC enabled Digital Mux OTHER Software programmable and maskable High Limits Software programmable THERM Limits PRODUCT ID 21h EMC1404 - 1 100_1100b 3 Detect Diode w/ REC enabled Fixed 2N3904 in anti-parallel diode configuration Note 1.1 Software programmable and maskable High Limits Software programmable THERM Limits 25h Note 1.1 External 2 and external 3 channels have beta configuration hard wired to `0111b' and REC enabled. 7 Revision 1.16 (03-15-07) SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 2 Pin Description Table 2.1 EMC1403 and EMC1404 Pin Description PIN NUMBER 1 2 3 4 VDD DP1 DN1 DP2 NAME FUNCTION Power supply External diode 1 positive (anode) connection External diode 1 negative (cathode) connection External diode 2 positive (anode) connection / External Diode 3 negative (cathode) connection for anti-parallel diodes External diode 2 negative (cathode) connection / External Diode 3 positive (anode) connection for antiparallel diodes Ground Critical THERM output signal requires pull-up resistor Active low digital ALERT output signal - requires pull-up resistor SMBus Data input/output SMBus Clock input Power AIO AIO AIO TYPE 5 DN2 AIO 6 7 8 9 10 GND THERM ALERT SMDATA SMCLK The pin types are described below: Power OD OD DIOD DI Power - these pins are used to supply either VDD or GND to the device. AIO - Analog Input / Output. DI - Digital Input. OD - Open Drain Digital Output. DIOD - Digital Input / Open Drain Output. Revision 1.16 (03-15-07) 8 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 3 Electrical Specifications 3.1 Absolute Maximum Ratings Table 3.1 Absolute Maximum Ratings DESCRIPTION Supply Voltage (VDD) Voltage on SMDATA and SMCLK pins Voltage on any other pin to Ground Operating Temperature Range Storage Temperature Range Lead Temperature Range Package Thermal Characteristics for MSOP-10 Thermal Resistance (j-a) ESD Rating, All pins HBM 132.2 2000 C/W V RATING -0.3 to 5.0 -0.3 to 5.5 -0.3 to VDD +0.3 -40 to +125 -55 to +150 Refer to JEDEC Spec. J-STD020 UNIT V V V C C Note: Stresses at or above those listed could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used. 3.2 Electrical Specifications Table 3.2 Electrical Specifications VDD = 3.0V to 3.6V, TA = -40C to 125C, all typical values at TA = 27C unless otherwise noted. CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS DC Power Supply Voltage Supply Current VDD IDD 3.0 3.3 150 750 3.6 220 V uA uA 1 conversion / sec, dynamic averaging disabled > 16 conversions / sec, dynamic averaging enabled SMSC EMC1403/EMC1404 9 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 3.2 Electrical Specifications (continued) VDD = 3.0V to 3.6V, TA = -40C to 125C, all typical values at TA = 27C unless otherwise noted. CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS Internal Temperature Monitor Temperature Accuracy 0.25 1 2 Temperature Resolution 0.125 C C C 0C < TA < 85C External Temperature Monitor Temperature Accuracy 0.25 0.5 Temperature Resolution tCONV tCONV Capacitive Filter CFILTER 0.125 190 150 2.2 2.5 1 2 C C C ms ms nF EMC1403, default settings EMC1404, default settings Connected across external diode +20C < TDIODE < +100C 0C < TA < 85C -40C < TDIODE < 127C ALERT and THERM pins Output Low Voltage VOL 0.4 V ISINK = 8mA Revision 1.16 (03-15-07) 10 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 3.3 SMBus Electrical Characteristics Table 3.3 SMBus Electrical Specifications VDD = 3.0V to 3.6V, TA = -40C to 125C, all typical values are at TA = 27C unless otherwise noted. CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS SMBus Interface Input High Voltage Input Low Voltage Input High/Low Current Input High/ Low Current Hysteresis Input Capacitance Output Low Sink Current CIN IOL 8.2 420 5 15 SMBus Timing Clock Frequency Spike Suppression Bus free time Start to Stop Hold Time: Start Setup Time: Start Setup Time: Stop Data Hold Time Data Setup Time Clock Low Period Clock High Period Clock/Data Fall time Clock/Data Rise time Capacitive Load fSMB tSP tBUF tHD:STA tSU:STA tSU:STP tHD:DAT tSU:DAT tLOW tHIGH tFALL tRISE CLOAD 1.3 0.6 0.6 0.6 0.3 100 1.3 0.6 300 300 400 10 400 50 kHz ns us us us us us ns us us ns ns pF Min = 20+0.1CLOAD ns Min = 20+0.1CLOAD ns per bus line VIH VIL IIH / IIL 2.0 -0.3 -1 VDD 0.8 1 TBD V V uA uA mV pF mA SMDATA = 0.4V 5V Tolerant 5V Tolerant TA = 27C, SMDATA / SMCLK = 0V to VDD SMDATA / SMCLK = 0V to 5.5V SMSC EMC1403/EMC1404 11 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 4 System Management Bus Interface Protocol 4.1 System Management Bus Interface Protocol The EMC1403 and EMC1404 communicate with a host controller, such as an SMSC SIO, through the SMBus. The SMBus is a two-wire serial communication protocol between a computer host and its peripheral devices. A detailed timing diagram is shown in Figure 4.1. . TLOW THIGH THD:STA TSU:STO SMCLK THD:STA TRISE TFALL THD:DAT TSU:DAT TSU:STA SMDTA TBUF P S S - Start Condition S P - Stop Condition P Figure 4.1 SMBus Timing Diagram The EMC1403 and EMC1404 are SMBus 2.0 compatible and support Send Byte, Read Byte, Write Byte, Receive Byte, and the Alert Response Address as valid protocols as shown below. All of the below protocols use the convention in Table 4.1. Table 4.1 Protocol Format DATA SENT TO DEVICE # of bits sent DATA SENT TO THE HOST # of bits sent Attempting to communicate with the EMC1403 and EMC1404 SMBus interface with an invalid slave address or invalid protocol will result in no response from the device and will not affect its register contents. Stretching of the SMCLK signal is supported, provided other devices on the SMBus control the timing. 4.2 Write Byte The Write Byte is used to write one byte of data to the registers as shown below Table 4.2: Table 4.2 Write Byte Protocol SLAVE ADDRESS 7 REGISTER ADDRESS 8 REGISTER DATA 8 START 1 WR 1 ACK 1 ACK 1 ACK 1 STOP 1 Revision 1.16 (03-15-07) 12 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 4.3 Read Byte The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.3. Table 4.3 Read Byte Protocol START SLAVE ADDRESS WR ACK REGISTER ADDRESS ACK START SLAVE ADDRESS RD ACK REGISTER DATA NACK STOP 1 7 1 1 8 1 1 7 1 1 8 1 1 4.4 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 Table 4.4. Table 4.4 Send Byte Protocol SLAVE ADDRESS 7 REGISTER ADDRESS 8 START 1 WR 1 ACK 1 ACK 1 STOP 1 4.5 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 Table 4.5. Table 4.5 Receive Byte Protocol SLAVE ADDRESS 7 START 1 RD 1 ACK 1 REGISTER DATA 8 NACK 1 STOP 1 4.6 Alert Response Address The ALERT output can be used as a processor 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 000_1100b. All devices with active interrupts will respond with their client address as shown in Table 4.6. Table 4.6 Alert Response Address Protocol ALERT RESPONSE ADDRESS 7 START 1 RD 1 ACK 1 DEVICE ADDRESS 8 NACK 1 STOP 1 SMSC EMC1403/EMC1404 13 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet The EMC1403 and EMC1404 will respond to the ARA in the following way: 1. Send Slave Address and verify that full slave 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 and if the MASK bit is cleared prior to the Status Register being cleared, the ALERT pin will be reasserted. 4.7 SMBus Address The EMC1403-1 and EMC1404-1 respond to hard-wired SMBus slave address as shown in Table 1.1. Note: Other addresses are available. Contact SMSC for more information. 4.8 SMBus Timeout The EMC1403 and EMC1404 support SMBus Timeout. If the clock line is held low for longer than 30ms, the device will reset its SMBus protocol. This function can be disabled by clearing the TIMEOUT bit in the Consecutive Alert Register (see Section 6.12). Revision 1.16 (03-15-07) 14 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 5 Product Description The EMC1403 and EMC1404 are SMBus temperature sensors. The EMC1403 monitors one internal diode and two externally connected temperature diodes. The EMC1404 monitors one internal diode and three externally connected temperature diodes. Thermal management is performed in cooperation with a host device. This consists of the host reading the temperature data of both the external and internal temperature diodes of the EMC1403 and EMC1404 and using that data to control the speed of one or more fans. The EMC1403 and EMC1404 have two levels of monitoring. The first provides a maskable ALERT signal to the host when the measured temperatures exceeds user programmable limits. This allows the EMC1403 or EMC1404 to be used as an independent thermal watchdog to warn the host of temperature hot spots without direct control by the host. The second level of monitoring provides a non maskable interrupt on the THERM pin if the measured temperatures meet or exceed a second programmable limit. Since the EMC1403 and EMC1404 automatically correct for temperature errors due to series resistance in temperature diode lines, there is greater flexibility in where external diodes are positioned and better measurement accuracy than previously available with non-resistance error correcting devices. The automatic beta detection feature means that there is no need to program the device according to which type of diode is present on the External Diode 1 channel. Therefore, the EMC1403/EMC1404 can power up ready to operate for any system configuration. For the EMC1404, External Diode channels 2 and 3 are only compatible with general purpose diodes (such as a 2N3904). Figure 5.1 shows a system level block diagram of the EMC1403. Figure 5.2 shows a system level block diagram of the EMC1404. CPU EMC1403 DP1 DN1 Internal Diode Host SMCLK SMDATA ALERT SMBus Interface Thermal diode DP2 DN2 THERM Power Control Figure 5.1 System Diagram for EMC1403 SMSC EMC1403/EMC1404 15 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet CPU EMC1404 DP1 DN1 Internal Diode DP2 Host SMCLK SMDATA ALERT SMBus Interface Thermal diode Anti-parallel diodes DN2 THERM Power Control Figure 5.2 System Diagram for EMC1404 5.1 Modes of Operation The EMC1403 and EMC1404 have two modes of operation. Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the programmed conversion rate. The temperature data is updated at the end of every conversion and the limits are checked. In Active mode, writing to the one-shot register will do nothing. Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce supply current. The temperature data is not updated and the limits are not checked. In this mode of operation, the SMBus is fully active and the part will return requested data. Writing to the oneshot register will enable the device to update all temperature channels. Once all the channels are updated, the device will return to the Standby mode. 5.1.1 Conversion Rates The EMC1403 and EMC1404 may be configured for different conversion rates based on the system requirements. The conversion rate is configured as described in Section 6.5. The default conversion rate is 4 conversions per second. Other available conversion rates are shown in Table 6.6. 5.1.2 Dynamic Averaging Dynamic averaging causes the EMC1403 and EMC1404 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). 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 16x longer than the normal 11 bit operation (nominally 21ms per channel) while still maintaining the selected conversion rate. The benefits of dynamic 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 applies when a one-shot command is issued. The device will perform the desired averaging during the one-shot operation according to the selected conversion rate. When enabled, the dynamic averaging will affect the average supply current based on the chosen conversion rate as shown in Table 5.1 for EMC1403. Revision 1.16 (03-15-07) 16 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 5.1 Supply Current vs. Conversion Rate for EMC1403 AVERAGING FACTOR (BASED ON 11-BIT OPERATION) ENABLED (DEFAULT) 16x 16x 16x 16x 16x 8x 4x 2x 1x 0.5x 0.25x AVERAGE SUPPLY CURRENT ENABLED (DEFAULT) 130uA 165uA 225uA 355uA 610uA 625uA 660uA 725uA 740uA 760uA 810uA CONVERSION RATE 1 / 16 sec 1 / 8 sec 1 / 4 sec 1 / 2 sec 1 / sec 2 / sec 4 / sec (default) 8 / sec 16 / sec 32 / sec 64 / sec DISABLED 100uA 105uA 110uA 125uA 150uA 295uA 290uA 480uA 740uA 760uA 810uA DISABLED 1x 1x 1x 1x 1x 1x 1x 1x 1x 0.5x 0.25x When enabled, the dynamic averaging will affect the average supply current based on the chosen conversion rate as shown in Table 5.2 for EMC1404. Table 5.2 Supply Current vs. Conversion Rate for EMC1404 AVERAGING FACTOR (BASED ON 11-BIT OPERATION) ENABLED (DEFAULT) 16x 16x 16x 16x 8x 4x 2x 1x 0.5x 0.25x 0.125x AVERAGE SUPPLY CURRENT ENABLED (DEFAULT) 150uA 195uA 290uA 475uA 485uA 505uA 540uA 610uA 625uA 650uA 715uA CONVERSION RATE 1 / 16 sec 1 / 8 sec 1 / 4 sec 1 / 2 sec 1 / sec 2 / sec 4 / sec (default) 8 / sec 16 / sec 32 / sec 64 / sec SMSC EMC1403/EMC1404 DISABLED 105uA 110uA 115uA 130uA 165uA 225uA 355uA 610uA 625uA 650uA 715uA 17 DISABLED 1x 1x 1x 1x 1x 1x 1x 1x 0.5x 0.25x 0.125x Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 5.2 THERM Output The THERM output is asserted independently of the ALERT output and cannot be masked. Whenever any of the measured temperatures exceed the user programmed THERM Limit values for the programmed number of consecutive measurements, the THERM output is asserted. Once it has been asserted, it will remain asserted until all measured temperatures drop below the THERM Limit minus the THERM Hysteresis (also programmable). When the THERM pin is asserted, the Therm status bits will likewise be set. Reading these bits will not clear them until the THERM pin is deasserted. Once the THERM pin is deasserted, the THERM status bits will be automatically cleared. 5.3 ALERT Output The ALERT pin is an open drain output and requires a pull-up resistor to VDD and has two modes of operation: interrupt mode and comparator Mode. The mode of the ALERT output is selected via the ALERT / COMP bit in the Configuration Register (see Section 6.4). 5.3.1 ALERT Pin Interrupt Mode When configured to operate in interrupt mode, 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 status bits are cleared. The ALERT pin can be masked by setting the MASK bit. Once the ALERT pin has been masked, it will be de-asserted and remain de-asserted until the MASK bit is cleared by the user. Any interrupt conditions that occur while the ALERT pin is masked will update the Status Register normally. 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. 5.3.2 ALERT Pin Comparator Mode When the ALERT pin is configured to operate in comparator mode it will be asserted if if any of the measured temperatures exceeds the respective high limit. The ALERT pin will remain asserted until all temperatures drop below the corresponding high limit minus the THERM Hysteresis value. When the ALERT pin is asserted in comparator mode, the corresponding high limit status bits 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 bit will not block the ALERT pin in this mode, however the individual channel masks (see Section 6.11) will prevent the respective channel from asserting the ALERT pin. 5.4 Beta Compensation The EMC1403 and EMC1404 are configured to monitor the temperature of basic diodes (e.g. 2N3904), or CPU thermal diodes. It automatically detects the type of external diode (CPU diode or diode connected transistor) and determines the optimal setting to reduce temperature errors introduced by beta variation for the External Diode 1 channel only. For discrete transistors configured with the collector 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 for substrate transistors where the base-emitter junction is used for temperature measurement and the collector is tied to the substrate, the proportional beta Revision 1.16 (03-15-07) 18 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 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 would contribute approximately 8.25C error at 100C. The External Diode 2 and External Diode 3 channels do not support Beta Compensation. 5.5 Resistance Error Correction (REC) Parasitic resistance in series with the external diodes will limit the accuracy obtainable from temperature measurement devices. The voltage developed across this resistance by the switching diode currents cause the temperature measurement to read higher than the true temperature. Contributors to series resistance are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk resistance in the base and emitter of the temperature transistor. Typically, the error caused by series resistance is +0.7C per ohm. The EMC1403 and EMC1404 automatically correct up to 100 ohms of series resistance. 5.6 Programmable External Diode Ideality Factor The EMC1403 and EMC1404 is designed for external diodes with an ideality factor of 1.008. Not all external diodes, processor or discrete, will have this exact value. This variation of the ideality factor introduces error in the temperature measurement which must be corrected for. This correction is typically done using programmable offset registers. Since an ideality factor mismatch introduces an error that is a function of temperature, this correction is only accurate within a small range of temperatures. To provide maximum flexibility to the user, the EMC1403 and EMC1404 provides a 6bit register for each external diode where the ideality factor of the diode used is programmed to eliminate errors across all temperatures. APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most ideality errors. 5.7 Diode Faults The EMC1403 and EMC1404 detect an open on the DP and DN pins, and a short across the DP and DN pins. For each temperature measurement made, the device checks for a diode fault on the external diode channel(s). When a diode fault is detected, the ALERT pin asserts (unless masked, see Section 5.8) and the temperature data reads 00h in the MSB and LSB registers (note: the low limit will not be checked). A diode fault is defined as one of the following: an open between DP and DN, a short from Vdd to DP, or a short from Vdd to DN. If a short occurs across DP and DN or a short occurs from DP to GND, the low limit status bit is set and the ALERT pin asserts (unless masked). This condition is indistinguishable from a temperature measurement of 0.000degC (-64C in extended range) resulting in temperature data of 00h in the MSB and LSB registers. If a short from DN to GND occurs (with a diode connected), temperature measurements will continue as normal with no alerts. 5.8 Consecutive Alerts The EMC1403 and EMC1404 contain multiple consecutive alert counters. One set of counters applies to the ALERT pin and the second set of counters applies to the THERM pin. Each temperature measurement channel has a separate consecutive alert counter for each of the ALERT and THERM pins. All counters are user programmable and determine the number of consecutive measurements that a temperature channel(s) must be out-of-limit or reporting a diode fault before the corresponding pin is asserted. See Section 6.12 for more details on the consecutive alert function. SMSC EMC1403/EMC1404 19 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 5.9 Digital Filter To reduce the effect of noise and temperature spikes on the reported temperature, the External Diode 1 channel uses a programmable digital filter. This filter can be configured as Level 1, Level 2, or Disabled. The typical filter performance is shown in Figure 5.3 and Figure 5.4. Filter Step Response 90 Temperature (C) 80 70 60 50 40 30 20 10 0 0 2 4 6 Samples 8 10 12 14 Disabled Level1 Level2 Figure 5.3 Temperature Filter Step Response Revision 1.16 (03-15-07) 20 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Filter Impulse Response 90 80 Temperature (C) 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 14 Samples Figure 5.4 Temperature Filter Impulse Response Disabled Level1 Level2 5.10 Temperature Monitors In general, thermal diode temperature measurements are based on the change in forward bias voltage of a diode when operated at two different currents. This VBE is proportional to absolute temperature as shown in the following equation: where: V BE = kT q I ln HIGH I LOW k = Boltzmann's constant T = absolute temperature in Kelvin q = electron charge [1] = diode ideality factor Figure 5.5 shows a block diagram of the temperature measurement circuit. The negative terminal for the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to ground. SMSC EMC1403/EMC1404 21 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet ILOW IHIGH Substrate PNP DP Resistance Error Correction DN AntiAliasing Filter ADC Figure 5.5 Block Diagram of Temperature Monitoring Circuit 5.11 Temperature Measurement Results and Data The temperature measurement results are stored in the internal and external temperature registers. These are then compared with the values stored in the high and low limit registers. Both external and internal temperature measurements are stored in 11-bit format with the eight (8) most significant bits stored in a high byte register and the three (3) least significant bits stored in the three (3) MSB positions of the low byte register. All other bits of the low byte register are set to zero. The EMC1403 and EMC1404 have two selectable temperature ranges. The default range is from 0C to +127C and the temperature is represented as binary number able to report a temperature from 0C to +127.875C in 0.125C steps. The extended range is an extended temperature range from -64C to +191C. The data format is a binary number offset by 64C. The extended range is used to measure temperature diodes with a large known offset (such as AMD processor diodes) where the diode temperature plus the offset would be equivalent to a temperature higher than +127C. Table 5.3 shows the default and extended range formats. Table 5.3 EMC1403 and EMC1404 Temperature Data Format EXTENDED RANGE RANGE -64C TO 191C 000 0000 0000 000 0000 0000 Note 5.2 001 1111 1111 010 0000 0000 010 0000 0001 22 SMSC EMC1403/EMC1404 TEMPERATURE (C) Diode Fault -64 -1 0 0.125 Revision 1.16 (03-15-07) DEFAULT RANGE 0C TO 127C 000 0000 0000 000 0000 0000 000 0000 0000 000 0000 0000 Note 5.1 000 0000 0001 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 5.3 EMC1403 and EMC1404 Temperature Data Format (continued) EXTENDED RANGE RANGE -64C TO 191C 010 0000 1000 100 0000 0000 100 0000 1000 101 1111 1000 101 1111 1111 110 0000 0000 111 1111 0000 111 1111 1000 111 1111 1111 Note 5.4 TEMPERATURE (C) 1 64 65 127 127.875 128 190 191 >= 191.875 DEFAULT RANGE 0C TO 127C 000 0000 1000 010 0000 0000 010 0000 1000 011 1111 1000 011 1111 1111 011 1111 1111 Note 5.3 011 1111 1111 011 1111 1111 011 1111 1111 Note 5.1 Note 5.2 Note 5.3 Note 5.4 In default mode, all temperatures < 0C will be reported as 0C. In the extended range, all temperatures < -64C will be reported as -64C. For the default range, all temperatures > +127.875C will be reported as +127.875C. For the extended range, all temperatures > +191.875C will be reported as +191.875C. 5.12 Anti-parallel Diode Connections The EMC1404 supports reading two external diodes on the same set of pins (DP2, DN2). These diodes are connected as shown in Figure 5.2. Due to the anti-parallel connection of these diodes, both diodes will be reverse biased by a VBE voltage (approximately 0.7V). Because of this reverse bias, only discrete thermal diodes (such as a 2N3904) are recommended to be placed on these pins. 5.13 External Diode Connections The EMC1403 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal diode, or an AMD processor diode. The diodes can be connected in a variety of ways as indicated in Figure 5.6. The EMC1404 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal diode, or an AMD processor diode on the External Diode 1 channel only. The External Diode 2 and External Diode 3 channels are configured to measure a pair of discrete anti-parallel diodes (shared on pins DP2 and DN2). The supported configurations for the external diode channels are shown in Figure 5.6. SMSC EMC1403/EMC1404 23 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet to DP to DN to DP to DP to DN Local Ground Typical remote substrate transistor i.e. CPU substrate PNP Typical remote discrete PNP transistor i.e. 2N3906 Figure 5.6 Diode Configurations to DN Typical remote discrete NPN transistor i.e. 2N3904 Revision 1.16 (03-15-07) 24 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Chapter 6 Register Description The registers shown in Table 6.1 are accessible through the SMBus. An entry of `-' indicates that the bit is not used and will always read `0'. Table 6.1 Register Set in Hexadecimal Order REGISTER ADDRESS 00h 01h 02h DEFAULT VALUE 00h Page 28 R R External Diode 1 Data High Byte Status Stores the integer data for External Diode 1 Stores the status bits for the Internal Diode and External Diodes Controls the general operation of the device (mirrored at address 09h) Controls the conversion rate for updating temperature data (mirrored at address 0Ah) Stores the 8-bit high limit for the Internal Diode (mirrored at address 0Bh) Stores the 8-bit low limit for the Internal Diode (mirrored at address 0Ch) Stores the integer portion of the high limit for External Diode 1 (mirrored at register 0Dh) Stores the integer portion of the low limit for External Diode 1 (mirrored at register 0Eh) Controls the general operation of the device (mirrored at address 03h) Controls the conversion rate for updating temperature data (mirrored at address 04h) 00h 00h Page 29 R/W R REGISTER NAME Internal Diode Data High Byte FUNCTION Stores the integer data for the Internal Diode PAGE 03h R/W Configuration 00h Page 29 04h R/W Conversion Rate 06h (4/sec) 55h (85C) 00h (0C) Page 30 05h R/W Internal Diode High Limit Internal Diode Low Limit External Diode 1 High Limit High Byte External Diode 1 Low Limit High Byte 06h R/W Page 31 07h R/W 55h (85C) 00h (0C) 08h R/W 09h R/W Configuration 00h Page 29 0Ah R/W Conversion Rate 06h (4/sec) Page 30 SMSC EMC1403/EMC1404 25 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.1 Register Set in Hexadecimal Order (continued) REGISTER ADDRESS DEFAULT VALUE 55h (85C) 00h (0C) Page 31 0Dh R/W External Diode 1 High Limit High Byte External Diode 1 Low Limit High Byte One shot External Diode 1 Data Low Byte Scratchpad Scratchpad External Diode 1 High Limit Low Byte External Diode 1 Low Limit Low Byte External Diode 2 High Limit High Byte External DIode 2 Low Limit High Byte External Diode 2 High Limit Low Byte External Diode 2 Low Limit Low Byte External Diode 1 THERM Limit External Diode 2 THERM Limit External Diode Fault Channel Mask Register Stores the integer portion of the high limit for External Diode 1 (mirrored at register 07h) Stores the integer portion of the low limit for External Diode 1 (mirrored at register 08h) A write to this register initiates a one shot update. Stores the fractional data for External Diode 1 Scratchpad register for software compatibility Scratchpad register for software compatibility Stores the fractional portion of the high limit for External Diode 1 Stores the fractional portion of the low limit for External Diode 1 Stores the integer portion of the high limit for External Diode 2 Stores the integer portion of the low limit for External Diode 2 Stores the fractional portion of the high limit External Diode 2 Stores the fractional portion of the low limit for External Diode 2 Stores the 8-bit critical temperature limit for External Diode 1 Stores the 8-bit critical temperature limit for External Diode 2 Stores status bits indicating which external diode detected a diode fault Controls the masking of individual channels 55h (85C) 00h (0C) 00h 00h 00h 00h 00h Page 31 14h 15h 16h 17h 18h 19h 1Ah R/W R/W R/W R/W R/W R/W R/W 00h 55h (85C) Page 31 00h (0C) 00h Page 31 00h 55h (85C) 55h (85C) 00h Page 33 Page 33 Page 33 Page 28 Page 33 Page 33 R/W REGISTER NAME Internal Diode High Limit Internal Diode Low Limit FUNCTION Stores the 8-bit high limit for the Internal Diode (mirrored at address 05h) Stores the 8-bit low limit for the Internal Diode (mirrored at address 06h) PAGE 0Bh R/W 0Ch R/W 0Eh R/W 0Fh 10h 11h 12h 13h W R R/W R/W R/W 1Bh R-C Page 34 1Fh R/W 00h Page 34 Revision 1.16 (03-15-07) 26 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.1 Register Set in Hexadecimal Order (continued) REGISTER ADDRESS 20h 21h DEFAULT VALUE 55h (85C) Page 33 R/W THERM Hysteresis Stores the 8-bit hysteresis value that applies to all THERM limits Controls the number of out-of-limit conditions that must occur before an interrupt is asserted Stores the integer data for External Diode 2 Stores the fractional data for External Diode 2 Stores the Beta Compensation circuitry settings for External Diode 1 Stores the Beta Compensation circuitry settings for External Diode 2 Stores the ideality factor for External Diode 1 Stores the ideality factor for External Diode 2 Stores the fractional data for the Internal Diode Stores the integer data for External Diode 3 Stores the fractional data for External Diode 3 Stores the integer portion of the high limit for External Diode 3 Stores the integer portion of the low limit for External Diode 3 Stores the fractional portion of the high limit for External Diode 3 Stores the fractional portion of the low limit for External Diode 3 Stores the 8-bit critical temperature limit for External Diode 3 Stores the ideality factor for External Diode 3 Status bits for the High Limits Status bits for the Low Limits Status bits for the THERM Limits 27 R/W R/W REGISTER NAME Internal Diode THERM Limit FUNCTION Stores the 8-bit critical temperature limit for the Internal Diode PAGE 0Ah (10C) 70h Page 35 22h R/W Consecutive ALERT External Diode 2 Data High Byte External Diode 2 Data Low Byte External Diode 1 Beta Configuration External Diode 2 Beta Configuration External Diode 1 Ideality Factor External Diode 2 Ideality Factor Internal Diode Data Low Byte External Diode 3 High Byte External Diode 3 Low Byte External Diode 3 High Limit High Byte External Diode 3 Low Limit High Byte External Diode 3 High Limit Low Byte External Diode 3 Low Limit Low Byte External Diode 3 THERM Limit External Diode 3 Ideality Factor High Limit Status Low Limit Status THERM Limit Status 23h 24h R R 00h Page 28 00h 25h R/W 08h Page 36 26h R/W 08h or 07h 12h (1.008) 12h (1.008) 00h 00h Page 36 27h 28h 29h 2Ah 2Bh 2Ch 2Dh 2Eh 2Fh 30h 31h 35h 36h 37h R/W R/W R R R R/W R/W R/W R/W R/W R/W R-C R-C R Page 37 Page 37 Page 28 Page 28 00h 55h (85C) 00h (0C) Page 31 00h 00h 55h (85C) 12h (1.008) 00h 00h 00h Page 33 Page 37 Page 38 Page 39 Page 39 SMSC EMC1403/EMC1404 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.1 Register Set in Hexadecimal Order (continued) REGISTER ADDRESS 40h FDh FEh FFh DEFAULT VALUE 00h Table 6.24 5Dh 01h R/W R/W R R R REGISTER NAME Filter Control Product ID SMSC ID Revision FUNCTION Controls the digital filter setting for the External Diode 1 channel Stores a fixed value that identifies each product Stores a fixed value that represents SMSC Stores a fixed value that represents the revision number PAGE Page 40 Page 40 Page 41 Page 41 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 read 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 automatically refresh this stored low byte data. 6.2 Temperature Data Registers Table 6.2 Temperature Data Registers ADDR 00h 29h 01h 10h 23h 24h 2Ah 2Bh R/W R R R R R R R R REGISTER Internal Diode High Byte Internal Diode Low Byte External Diode 1 High Byte External Diode 1 Low Byte External Diode 2 High Byte External Diode 2 Low Byte External Diode 3 High Byte External Diode 3 Low Byte B7 128 0.5 128 0.5 128 0.5 128 0.5 B6 64 0.25 64 0.25 64 0.25 64 0.25 B5 32 0.125 32 0.125 32 0.125 32 0.125 B4 16 16 16 16 - B3 8 8 8 8 - B2 4 4 4 4 - B1 2 2 2 2 - B0 1 1 1 1 - DEFAULT 00h 00h 00h 00h 00h 00h 00h 00h As shown in Table 6.2, all temperatures are stored as an 11-bit value with the high byte representing the integer value and the low byte representing the fractional value left justified to occupy the MSBits. Revision 1.16 (03-15-07) 28 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 6.3 Status Register Table 6.3 Status Register ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 02h R Status BUSY - - HIGH LOW FAULT THERM - 00h The Status Register reports general error conditions. To identify specific channels, refer to Section 6.10, Section 6.15, Section 6.16, and Section 6.17. The individual Status Register bits are cleared when the appropriate High Limit, Low Limit, or THERM Limit register has been read or cleared. Bit 7 - BUSY - This bit indicates that the ADC is currently converting. This bit does not cause either the ALERT or THERM pins to be asserted. Bit 4 - HIGH - This bit is set when any of the temperature channels exceeds its programmed high limit. See the High Limit Status Register for specific channel information (Section 6.15). When set, this bit will assert the ALERT pin. Bit 3 - LOW - This bit is set when any of the temperature channels drops below its programmed low limit. See the Low Limit Status Register for specific channel information (Section 6.16). When set, this bit will assert the ALERT pin. Bit 2 - FAULT - This bit is asserted when a diode fault is detected on any of the external diode channels. See the External Diode Fault Register for specific channel information (Section 6.10). When set, this bit will assert the ALERT pin. Bit 1 - THERM - This bit is set when the any of the temperature channels exceeds its programmed THERM limit. See the THERM Limit Status Register for specific channel information (Section 6.17). When set, this bit will assert the THERM pin. 6.4 Configuration Register Table 6.4 Configuration Register ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 03h R/W 09h Configuration MASK _ALL RUN / STOP ALERT/ COMP RECD 1 RECD 2 RANGE DAVG_ DIS APDD 00h The Configuration Register controls the basic operation of the device. This register is fully accessible at either address. Bit 7 - MASK_ALL - Masks the ALERT pin from asserting. `0' (default) - The ALERT pin is not masked. If any of the appropriate status bits are set the ALERT pin will be asserted. `1' - The ALERT pin is masked. It will not be asserted for any interrupt condition unless it is configured as a secondary THERM pin. The Status Registers will be updated normally. Bit 6 - RUN / STOP - Controls Active/Standby modes. `0' (default) - The device is in Active mode and converting on all channels. `1' -The device is in Standby mode and not converting. Bit 5 - ALERT/COMP - Controls the operation of the ALERT pin. `0' (default) - The ALERT pin acts as described in Section 5.3. SMSC EMC1403/EMC1404 29 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet `1' - The ALERT pin acts in comparator mode as described in Section 5.3.2. In this mode the MASK_ALL bit is ignored. Bit 4 - RECD1 - Disables the Resistance Error Correction (REC) for External Diode 1. `0' (default)- REC is enabled for External Diode 1. `1' - REC is disabled for External Diode 1. Bit 3 - RECD2 - Disables the Resistance Error Correction (REC) for External Diode 2 and External Diode 3. `0' (default) - REC is enabled for External Diode 2 and External Diode 3. `1' - REC is disabled for External Diode 2 and External Diode 3. Bit 2 - RANGE - Configures the measurement range and data format of the temperature channels. `0' (default) - The temperature measurement range is 0C to +127.875C and the data format is binary. `1' -The temperature measurement range is -64C to +191.875C and the data format is offset binary (see Table 5.3). Bit 1 - DAVG_DIS - Disables the dynamic averaging feature on all temperature channels. `0' (default) - The dynamic averaging feature is enabled. All temperature channels will be converted with an averaging factor that is based on the conversion rate as shown in Table 5.1 and Table 5.2. `1' - The dynamic averaging feature is disabled. All temperature channels will be converted with a maximum averaging factor of 1x (equivalent to 11-bit conversion). For higher conversion rates, this averaging factor will be reduced as shown in Table 5.1 and Table 5.2. Bit 0 - APDD (EMC1404 only) - Disables the anti-parallel diode operation. Beta Compensation is disabled on External Diode 2 and 3 regardless of APDD setting. In addition, External Diode 2 Beta Configuration register will be ignored. `0' (default) - Anti-parallel diode mode is enabled. Two external diodes will be measured on the DP2 and DN2 pins. `1' - Anti-parallel diode mode is disabled. Only one external diode will be measured on the DP2 and DN2 pins. 6.5 Conversion Rate Register Table 6.5 Conversion Rate Register ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 04h R/W 0Ah Conversion Rate - - - - CONV[3:0] 06h (4/sec) The Conversion Rate Register controls how often the temperature measurement channels are updated and compared against the limits. This register is fully accessible at either address. Bits 3-0 - CONV[3:0] - Determines the conversion rate as shown in Table 6.6. Revision 1.16 (03-15-07) 30 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.6 Conversion Rate CONV[3:0] HEX 0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh - Fh 3 0 0 0 0 0 0 0 0 1 1 1 2 0 0 0 0 1 1 1 1 0 0 0 All others 1 0 0 1 1 0 0 1 1 0 0 1 0 0 1 0 1 0 1 0 1 0 1 0 CONVERSIONS / SECOND 1 / 16 1/8 1/4 1/2 1 2 4 (default) 8 16 32 64 1 6.6 Limit Registers Table 6.7 Temperature Limit Registers ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 05h R/W 0Bh 06h R/W 0Ch 07h R/W 0Dh Internal Diode High Limit Internal Diode Low Limit External Diode 1 High Limit High Byte External Diode 1 High Limit Low Byte External Diode 1 Low Limit High Byte 128 64 32 16 8 4 2 1 55h (85C) 00h (0C) 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 55h (85C) 13h R/W 0.5 0.25 0.125 - - - - - 00h 08h R/W 0Eh 128 64 32 16 8 4 2 1 00h (0C) SMSC EMC1403/EMC1404 31 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.7 Temperature Limit Registers (continued) ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 14h R/W External Diode 1 Low Limit Low Byte External Diode 2 High Limit High Byte External Diode 2 Low Limit High Byte External Diode 2 High Limit Low Byte External Diode 2 Low Limit Low Byte External Diode 3 High Limit High Byte External Diode 3 Low Limit High Byte External Diode 3 High Limit Low Byte External Diode 3 Low Limit Low Byte 0.5 0.25 0.125 - - - - - 00h 15h R/W 128 64 32 16 8 4 2 1 55h (85C) 16h R/W 128 64 32 16 8 4 2 1 00h (0C) 17h R/W 0.5 0.25 0.125 - - - - - 00h 18h R/W 0.5 0.25 0.125 - - - - - 00h 2Ch R/W 128 64 32 16 8 4 2 1 55h (85C) 2Dh R/W 128 64 32 16 8 4 2 1 00h (0C) 2Eh R/W 0.5 0.25 0.125 - - - - - 00h 2Fh R/W 0.5 0.25 0.125 - - - - - 00h The device contains both high and low limits for all temperature channels. If the measured temperature exceeds the high limit, then the corresponding status bit is set and the ALERT pin is asserted. Likewise, if the measured temperature is less than or equal to the low limit, the corresponding status bit is set and the ALERT pin is asserted. The data format for the limits must match the selected data format for the temperature so that if the extended temperature range is used, the limits must be programmed in the extended data format. The limit registers with multiple addresses are fully accessible at either address. When the device is in standby mode, updating the limit registers will have no affect until the next conversion cycle occurs. This can be initiated via a write to the One Shot Register or by clearing the RUN / STOP bit in the Configuration Register (see Section 6.4). Revision 1.16 (03-15-07) 32 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 6.7 Scratchpad Registers Table 6.8 Scratchpad Register ADDR 11h 12h R/W R/W R/W REGISTER Scratchpad Scratchpad B7 7 7 B6 6 6 B5 5 5 B4 4 4 B3 3 3 B2 2 2 B1 1 1 B0 0 0 DEFAULT 00h 00h The Scratchpad Registers are Read Write registers that are used for place holders to be software compatible with legacy programs. Reading from the registers will return what is written to them. 6.8 One Shot Register Table 6.9 One Shot Register ADDR. 0Fh R/W W REGISTER One Shot B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 00h Writing to this register initiates a single conversion cycle. Data is not stored and always reads 00h The One Shot Register is used to initiate a one shot command. Writing to the one shot register, when the device is in standby mode and BUSY bit (in Status Register) is `0', will immediately cause the ADC to update all temperature measurements. Writing to the One Shot Register while the device is in active mode will have no affect. 6.9 Therm Limit Registers Table 6.10 Therm Limit Registers ADDR. R/W REGISTER External Diode 1 THERM Limit External Diode 2 THERM Limit Internal Diode THERM Limit THERM Hysteresis External Diode 3 THERM Limit B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 55h (85C) 55h (85C) 55h (85C) 0Ah (10C) 55h (85C) 19h R/W 128 64 32 16 8 4 2 1 1Ah R/W 128 64 32 16 8 4 2 1 20h 21h R/W R/W 128 128 64 64 32 32 16 16 8 8 4 4 2 2 1 1 30h R/W 128 64 32 16 8 4 2 1 The THERM Limit Registers are used to determine whether a critical thermal event has occurred. If the measured temperature exceeds the THERM Limit, then the THERM pin is asserted. The limit setting must match the chosen data format of the temperature reading registers. SMSC EMC1403/EMC1404 33 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Unlike the ALERT pin, the THERM pin cannot be masked. Additionally, the THERM pin will be released once the temperature drops below the corresponding threshold minus the THERM Hysteresis. 6.10 External Diode Fault Register Table 6.11 External Diode Fault Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 1Bh R-C External Diode Fault - - - - E3FLT E2FLT E1FLT - 00h The External Diode Fault Register indicates which of the external diodes caused the FAULT bit in the Status Register to be set. This register is cleared when it is read. 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 Mask Register Table 6.12 Channel Mask Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 1Fh R/W Channel Mask - - - - E3 MASK E2 MASK E1 MASK INT MASK 00h The Channel Mask Register controls individual 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. The channel mask does not mask the THERM pin. Bit 3 - E3MASK - Masks the ALERT pin from asserting when the External Diode 3 channel is out of limit or reports a diode fault. `0' (default) - The External Diode 3 channel will cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. `1' - The External Diode 3 channel will not cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. Bit 2 - E2MASK - Masks the ALERT pin from asserting when the External Diode 2 channel is out of limit or reports a diode fault. `0' (default) - The External Diode 2 channel will cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. `1' - The External Diode 2 channel will not cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. Bit 1 - E1MASK - Masks the ALERT pin from asserting when the External Diode 1 channel is out of limit or reports a diode fault. `0' (default) - The External Diode 1 channel will cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. `1' - The External Diode 1 channel will not cause the ALERT pin to be asserted if it is out of limit or reports a diode fault. Revision 1.16 (03-15-07) 34 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Bit 0 - INTMASK - Masks the ALERT pin from asserting 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. `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 Table 6.13 Consecutive ALERT Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 22h R/W Consecutive ALERT TIME OUT CTHRM[2:0] CALRT[2:0] - 70h The Consecutive ALERT Register determines how many times an out-of-limit error or diode fault must be detected in consecutive measurements before the ALERT or THERM pin is asserted. Additionally, the Consecutive ALERT Register controls the SMBus Timeout functionality. An out-of-limit condition (i.e. HIGH, LOW, or FAULT) occurring on the same temperature channel in consecutive measurements will increment the consecutive alert counter. The counters will also be reset if no out-of-limit condition or diode fault condition occurs in a consecutive reading. When the ALERT pin is configured as an interrupt, when the consecutive alert counter reaches its programmed value, the following will occur: the STATUS bit(s) for that channel and the last error condition(s) (i.e. E1HIGH, or E2LOW and/or E2FAULT) will be set to `1', the ALERT pin will be asserted, the consecutive alert counter will be cleared, and measurements will continue. When the ALERT pin is configured as a comparator, the consecutive alert counter will ignore diode fault and low limit errors and only increment if the measured temperature exceeds the High Limit. Additionally, once the consecutive alert counter reaches the programmed limit, the ALERT pin will be asserted, but the counter will not be reset. It will remain set until the temperature drops below the High Limit minus the THERM Hysteresis value. For example, if the CALRT[2:0] bits are set for 4 consecutive alerts on an EMC1403 device, the high limits are set at 70C, and none of the channels are masked, then the ALERT pin will be asserted after the following four measurements: 1. Internal Diode reads 71C and both external diodes read 69C. Consecutive alert counter for INT is incremented to 1. 2. Both Internal Diode and 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 external diodes read 71C. Consecutive alert counter for INT is incremented to 2, EXT2 is set to 2, and EXT1 is incremented to 4. The appropriate status bits are set for EXT1 and the ALERT pin is asserted. EXT1 counter is reset to 0 and all other counters hold the last value until the next temperature measurement. Bit 7 - TIMEOUT - Determines whether the SMBus Timeout function is enabled. `0' (default) - The SMBus Timeout feature is disabled. The SMCLK line can be held low indefinitely without the device resetting its SMBus protocol. `1' - The SMBus Timeout feature is enabled. If the SMCLK line is held low for more than 30ms, then the device will reset the SMBus protocol. SMSC EMC1403/EMC1404 35 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the corresponding THERM Limit before the THERM pin is asserted. All temperature channels use this value to set the respective counters. The consecutive THERM counter is incremented whenever any measurement exceed the corresponding THERM Limit. If the temperature drops below the THERM limit, then the counter is reset. If a number of consecutive measurements above the THERM limit occurs, then the THERM pin is asserted low. Once the THERM pin has been asserted, the consecutive therm counter will not reset until the corresponding temperature drops below the THERM Limit minus the THERM Hysteresis value. The bits are decoded as shown in Table 6.14. The default setting is 4 consecutive out of limit conversions. Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of limit condition or diode fault before the ALERT pin is asserted. All temperature channels use this value to set the respective counters. The bits are decoded as shown in Table 6.14. The default setting is 1 consecutive out of limit conversion. Table 6.14 Consecutive Alert / THERM Settings NUMBER OF CONSECUTIVE OUT OF LIMIT MEASUREMENTS 1 (default for CALRT[2:0]) 2 3 4 (default for CTHRM[2:0]) 2 0 0 0 1 1 0 0 1 1 0 0 1 1 1 6.13 Beta Configuration Registers Table 6.15 Beta Configuration Registers ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 25h R/W External Diode 1 Beta Configuration External Diode 2 Beta Configuration - - - - ENABLE1 BETA1[2:0] 08h 08h for EMC1403 or 07h for EMC1404 26h R/W - - - - ENABLE2 BETA2[2:0] This register is used to set the Beta Compensation factor that is used for the external diode channels. Bit 3 - ENABLEx - Enables the Beta Compensation factor autodetection function. This function shall be disabled for External Diode 2. `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 Compensation factor autodetection circuitry is enabled. At the beginning of every conversion, the optimal Beta Compensation factor setting will be determined and applied. The BETAx[2:0] bits will be automatically updated to indicate the current setting. Revision 1.16 (03-15-07) 36 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Bit 2-0 - BETAx[2:0] - These bits always reflect the current beta configuration settings. If autodetection circuitry is enabled, then these bits will be updated automatically and writing to these bits will have no effect. If the autodetection circuitry is disabled, then these bits will determine the beta configuration setting that is used for their respective channels. Care should be taken when setting the BETAx[2:0] bits when the autodetection circuitry is disabled. If the Beta Compensation factor is set at a beta value that is higher than the transistor beta, then the circuit may introduce measurement errors. When measuring a discrete thermal diode (such as 2N3904) or a CPU diode that functions like a discrete thermal diode (such as an AMD processor diode), then the BETAx[2:0] bits should be set to `111b'. Table 6.16 CPU Beta Values BETAX[2:0] HEX 0h 1h 2h 3h 4h 5h 6h 7h 8h - Fh ENABLEX 0 0 0 0 0 0 0 0 1 2 0 0 0 0 1 1 1 1 X 1 0 0 1 1 0 0 1 1 X 0 0 1 0 1 0 1 0 1 X MINIMUM BETA 0.11 0.18 0.25 0.33 0.43 1.00 2.33 Disabled Autodetection 6.14 External Diode Ideality Factor Registers Table 6.17 Ideality Configuration Registers ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 27h R/W External Diode 1 Ideality Factor External Diode 2 Ideality Factor External Diode 3 Ideality Factor - - IDEALITY1[5:0] 12h 28h R/W - - IDEALITY2[5:0] 12h 31h R/W - - IDEALITY3[5:0] 12h These registers store the ideality factors that are applied to the external diodes. Table 6.18 defines each setting and the corresponding ideality factor. Beta Compensation and Resistance Error Correction automatically correct for most diode ideality errors, therefore it is not recommended that these settings be updated without consulting SMSC. SMSC EMC1403/EMC1404 37 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Table 6.18 Ideality Factor Look-Up Table SETTING 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh 10h 11h 12h 13h 14h 15h 16h 17h FACTOR 0.9949 0.9962 0.9975 0.9988 1.0001 1.0014 1.0027 1.0040 1.0053 1.0066 1.0080 1.0093 1.0106 1.0119 1.0133 1.0146 SETTING 18h 19h 1Ah 1Bh 1Ch 1Dh 1Eh 1Fh 20h 21h 22h 23h 24h 25h 26h 27h FACTOR 1.0159 1.0172 1.0185 1.0200 1.0212 1.0226 1.0239 1.0253 1.0267 1.0280 1.0293 1.0306 1.0319 1.0332 1.0345 1.0358 SETTING 28h 29h 2Ah 2Bh 2Ch 2Dh 2Eh 2Fh 30h 31h 32h 33h 34h 35h 36h 37h FACTOR 1.0371 1.0384 1.0397 1.0410 1.0423 1.0436 1.0449 1.0462 1.0475 1.0488 1.0501 1.0514 1.0527 1.0540 1.0553 1.0566 6.15 High Limit Status Register Table 6.19 High Limit Status Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 35h R-C High Limit Status - - - - E3HIGH E2HIGH E1HIGH IHIGH 00h The High Limit Status Register contains the status bits that are set when a temperature channel high limit is exceeded. If any of these bits are set, then the HIGH status bit in the Status Register is set. Reading from the High Limit Status Register will clear all bits if. Reading from the register will also clear the HIGH status bit in the Status Register. The ALERT pin will be set if the programmed number of consecutive alert counts have been met and any of these status bits are set. The status bits will remain set until read unless the ALERT pin is configured as a comparator output (see Section 5.3.2). Bit 3 - E3HIGH - This bit is set when the External Diode 3 channel exceeds its programmed high limit. Bit 2 - E2HIGH - This bit is set when the External Diode 2 channel exceeds its programmed high limit. Bit 1 - E1HIGH - This bit is set when the External Diode 1 channel exceeds its programmed high limit. Revision 1.16 (03-15-07) 38 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Bit 0 - IHIGH - This bit is set when the Internal Diode channel exceeds its programmed high limit. 6.16 Low Limit Status Register Table 6.20 Low Limit Status Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 36h R-C Low Limit Status - - - - E3L OW E2L OW E1LOW ILOW 00h The Low Limit Status Register contains the status bits that are set when a temperature channel drops below the low limit. If any of these bits are set, then the LOW status bit in the Status Register is set. Reading from the Low Limit Status Register will clear all bits. Reading from the register will also clear the LOW status bit in the Status Register. The ALERT pin will be set if the programmed number of consecutive alert counts have been met and any of these status bits are set. The status bits will remain set until read unless the ALERT pin is configured as a comparator output (see Section 5.3.2). 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. 6.17 THERM Limit Status Register Table 6.21 THERM Limit Status Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 37h R-C THERM Limit Status - - - - E3 THERM E2 THERM E1 THERM ITHERM 00h The THERM Limit Status Register contains the status bits that are set when a temperature channel THERM Limit is exceeded. If any of these bits are set, then the THERM status bit in the Status Register is set. Reading from 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 automatically cleared. The THERM bit in the Status Register will be cleared when all individual channel THERM bits are cleared. Bit 3 - E3THERM - This bit is set when the External Diode 3 channel exceeds it's programmed THERM Limit. When set, this bit will assert the THERM pin. Bit 2 - E2THERM - This bit is set when the External Diode 2 channel exceeds it's programmed THERM Limit. When set, this bit will assert the THERM pin. Bit 1 - E1THERM - This bit is set when the External Diode 1 channel exceeds it's programmed THERM limit. When set, this bit will assert the THERM pin. SMSC EMC1403/EMC1404 39 Revision 1.16 (03-15-07) DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet Bit 0- ITHERM - This bit is set when the Internal Diode channel exceeds it's programmed THERM limit. When set, this bit will assert the THERM pin. 6.18 Filter Control Register Table 6.22 Filter Configuration Register ADDR. R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 40h R/W Filter Control - - - - - - FILTER[1:0] 00h The Filter Configuration Register controls the digital filter on the External Diode 1 channel. Bits 1-0 - FILTER[1:0] - Control the level of digital filtering that is applied to the External Diode temperature measurements as shown in Table 6.23. See Figure 5.3and Figure 5.4 for examples on the filter behavior. Table 6.23 Filter Settings FILTER[1:0] 1 0 0 1 1 0 0 1 0 1 Disabled (default) Level 1 Level 1 Level 2 AVERAGING 6.19 Product ID Register Table 6.24 Product ID Register ADDR FDh FDh R/W R R REGISTER Product ID Product ID B7 0 0 B6 0 0 B5 1 1 B4 0 0 B3 0 0 B2 0 1 B1 0 0 B0 1 1 DEFAULT 21h EMC1403 25h EMC1404 The Product ID Register holds a unique value that identifies the device. Revision 1.16 (03-15-07) 40 SMSC EMC1403/EMC1404 DATASHEET 1C Temperature Sensor with Beta Compensation Datasheet 6.20 SMSC ID Register (FEh) Table 6.25 Manufacturer ID Register ADDR. FEh R/W R REGISTER SMSC ID B7 0 B6 1 B5 0 B4 1 B3 1 B2 1 B1 0 B0 1 DEFAULT 5Dh The Manufacturer ID register contains an 8 bit word that identifies the SMSC as the manufacturer of the EMC1403 and EMC1404. 6.21 Revision Register (FFh) Table 6.26 Revision Register ADDR. FFh R/W R REGISTER Revision B7 0 B6 0 B5 0 B4 0 B3 0 B2 0 B1 0 B0 1 DEFAULT 01h The Revision register contains an 8 bit word that identifies the die revision. SMSC EMC1403/EMC1404 41 Revision 1.16 (03-15-07) DATASHEET REVISION HISTORY REVISION DESCRIPTION INITIAL RELEASE DATE 3/29/05 RELEASED BY S.K.ILIEV 3 5 D e A PIN 1 IDENTIFIER AREA (D/2 X E1/2) c 4 3 E1 E 4 2 10X b SEE DETAIL "A" TOP VIEW END VIEW A2 C A SEATING PLANE A1 ccc C NOTES: 1. ALL DIMENSIONS ARE IN MILLIMETER. 2. TOLERANCE ON THE TRUE POSITION OF EACH LEAD IS 0.04 mm AT MAXIMUM MATERIAL CONDITION. 3. PACKAGE BODY DIMENSIONS "D" AND "E1" DO NOT INCLUDE MOLD/INTERLEAD PROTRUSIONS OR FLASH. MAXIMUM MOLD PROTRUSIONS OR FLASH IS 0.15 mm (0.006 INCHES) PER END AND SIDE. DIMENSIONS "D" AND "E1" ARE DETERMINED AT THE OUTERMOST EXTREMES OF THE PLASTIC BODY, INCLUDING ANY MISMATCH BETWEEN TOP AND BOTTOM PLASTIC BODY. THEY ARE DETERMINED AT DATUM PLANE "H". 4. DIMENSIONS "b" AND "c" APPLY TO THE FLAT SECTION OF THE LEAD BETWEEN 0.08 mm AND 0.15 mm FROM THE LEAD TIP. 5. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. SIDE VIEW 3-D VIEW H C 0.25 SEATING PLANE GAUGE PLANE 0 - 8 L (0.95) UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN MILLIMETERS AND TOLERANCES ARE: DECIMAL 0.1 X.X X.XX 0.05 X.XXX 0.025 ANGULAR 1 THIRD ANGLE PROJECTION 80 ARKAY DRIVE HAUPPAUGE, NY 11788 USA TITLE DETAIL "A" DIM AND TOL PER ASME Y14.5M - 1994 MATERIAL NAME DRAWN DATE S.K.ILIEV CHECKED 3/29/05 3/29/05 SCALE FINISH PRINT WITH "SCALE TO FIT" DO NOT SCALE DRAWING DWG NUMBER REV S.K.ILIEV APPROVED MO-10-TSSOP-3x3 STD COMPLIANCE SHEET A 1 OF 1 S.K.ILIEV 3/29/05 1:1 JEDEC: MO-187 Figure 7.1 10 PIN MSOP / TSSOP Package SMSC EMC1403/EMC1404 - PACKAGE OUTLINE 10 PIN TSSOP, 3x3 MM BODY, 0.50 MM PITCH 42 DATASHEET Revision 1.16 (03-15-07) Chapter 7 Package Information |
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