 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| ? 2009 microchip technology inc. ds22153c-page 1 mcp9843/98243 features meets jedec specification - mcp9843 - jc42.4-tse3000b3 temperature sensor - mcp98243 --> jc42.4-tse2002b3 temperature sensor with 2 kbit serial eeprom for serial presence detect (spd) 2-wire i 2 c?/smbus interface available packages: - dfn-8, tdfn-8, udfn-8, tssop-8 temperature sensor features temperature-to-digital converter sensor accuracy (grade b): - 0.2c/1c (typ./max.) +75c to +95c - 0.5c/2c (typ./max.) +40c to +125c - 1c/3c (typ./max.) -20c to +125c specified v dd range: 3.0v to 3.6v operating current: 200 a (typical) operating v dd range: 2.7v to 5.5v serial eeprom features (mcp98243) specified v dd range: 1.8v to 5.5v operating current: -write 1.1 ma (typical) for 3.5 ms (typical) - read 100 a (typical) permanent and reversible software write protect software write protection for the lower 1 kbit organized as 1 block of 256 x 8-bit (2 kbit) typical applications dimm modules for servers, pcs, and laptops general purpose temperature datalog description microchip technology inc.s mcp9843/98243 digital temperature sensors convert temperature from -40c and +125c to a digital word. these sensors meet jedec specification jc42.4-tse3000b3 and jc42.4-tse2002b3 memory module thermal sensor component. it provides an accuracy of 0.2c/1c (typical/maximum) from +75c to +95c. in addition, mcp98243 has an internal 256 byte eeprom which can be used to store memory module and vendor information. the mcp9843/98243 digital temperature sensor comes with user-programmabl e registers that provide flexibility for dimm temperature-sensing applications. the registers allow user-selectable settings such as shutdown or low-power modes and the specification of temperature event boundaries. when the temperature changes bey ond the specified event boundary limits, the mcp9843/98243 outputs an alert signal at the event pin. the user has the option of setting the temperature event output signal polarity as either an active-low or active-high comparator output for thermostat operation, or as a temperature event interrupt output for mi croprocessor-based systems. the mcp98243 eeprom is designed specifically for dram dimms (dual in-line memory modules) serial presence detect (spd). the lower 128 bytes (address 0x00 to 0x7f) can be permanent write protected (pwp) or software reversib le write protected (swp). this allows dram vendor and product information to be stored and write protec ted. the upper 128 bytes (address 0x80 to 0xff) can be used for general purpose data storage. these addresses are not write protected. this sensor has an industry standard 2-wire, i 2 c compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. package types dimm module mcp9843/98243 8-pin 2x3 dfn/tdfn/udfn * sda gnd event scl 1 2 3 4 8-pin tssop a0 v dd a1 a2 8 7 6 5 * includes exposed thermal pad (ep); see table 3-1 . scl event sda a1a2 1 2 3 4 8 7 6 5 gnd a0 v dd ep 9 memory module temperature sensor w/ eeprom for spd downloaded from: http:///
mcp9843/98243 ds22153c-page 2 ? 2009 microchip technology inc. sensor typical accuracy performance note: this accuracy data from the production system repr esents the typical accuracy performance of the mcp98242 memory module temperature sensor. the mcp98242 production methodology is also used for the mcp9843/98243 to achieve the same typical accuracy performance. 0% 10% 20% 30% 40% 50% -1.0 -0.8 -0.6 -0.4 -0.2 0.00.2 0.4 0.6 0.8 1.0 temperature accuracy (c) occurrences t a = +85c 1,063,478 units 63 production lots statistics: average = 0.003 c st. dev = 0.13 c 3 sigma = 0.4 c mcp98243 vs. mcp98242 feature mcp98243 mcp98242 event output in shutdown mode event output de-asserts event output remains in previous state. if the output asserts before shutdown command, it remains asserted during shutdown i 2 c communication timeout range t out = 25 ms to 35 ms t out = 20 ms to 50 ms i 2 c maximum bus frequency 400 khz 100 khz i 2 c scl & sda v il /v ih voltage levels v il_max =0.3*v dd , v ih_min =0.7*v dd v il_max = 0.8v, v ih_min = 2.1v v hv a0 range 7v to 12v 8v to 12v i 2 c spike supression 50 ns i 2 c input hysteresis 0.05v dd 0.5v device/revision id register 0x2101 (hex) 0x2001 downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 3 mcp9843/98243 1.0 electrical characteristics absolute maximum ratings ? v dd .................................................................................. 6.0v voltage at all input/output pins ............... gnd C 0.3v to 6.0v pin a0 ................................................... gnd C 0.3v to 12.5v storage temperature .....................................-65c to +150c ambient temp. with power applied ................-40c to +125c junction temperature (t j ) .......................................... +150c esd protection on all pins (hbm:mm) ................. (4 kv:300v) latch-up current at each pin (25c) ....................... 200 ma ?notice: stresses above those listed under maximum ratings may cause permanent dam age to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. temperature sensor dc characteristics electrical specifications: unless otherwise indicated, v dd = 3.0v to 3.6v, gnd = ground, and t a = -20c to +125c. parameters sym min typ max unit conditions temperature sensor accuracy +75c < t a +95c t acy -1.0 0.2 +1.0 c jc42.4 - tse2002b3 grade b accuracy specification +40c < t a +125c -2.0 0.5 +2.0 c -20c < t a +125c -3.0 1 +3.0 c t a = -40c -1 c temperature conversion time 0.25c/bit t conv 65 125 ms 15 s/sec (typical) (see section 5.2.4 ) power supply specified voltage range v dd 3.0 3.6 v jc42.4 specified voltage range operating voltage range v dd 2.7 5.5 v note 1 operating current i dd_ts 200 500 a eeprom inactive shutdown current - mcp9843 mcp98243 i shdn 1 2 a eeprom inactive, i 2 c bus inactive 1 3 a power on reset (por) v por_ts 2.2 v threshold for falling v dd voltage power supply rejection, t a = +25c c/ v dd 0.3 c/vv dd = 2.7v to 5.5v 0.15 c v dd = 3.3v+150 mv pp ac (0 to 1 mhz) event output (open-drain output, ex ternal pull-up or pull-down resi stor required), see section 5.2.3 high-level current (leakage) i oh 1 av oh = v dd (active-low, pull-up resistor) low-level voltage v ol 0 . 4 vi ol = 3 ma (active-low, pull-up resistor) low-level current (leakage) i ol 1 av ol = v ss (active-high, pull-down resistor) high-level voltage v oh v dd -0.5 v i oh = 3 ma (active-high, pull-down resistor) thermal response, from +25c (air) to +125c (oil bath) dfn/udfn/tdfn-8 t res 0.7 s time to 63% (89c) tssop-8 1.4 s note 1: characterized but not produ ction tested. also, see section 2.0 typical performance curves . downloaded from: http:/// mcp9843/98243 ds22153c-page 4 ? 2009 microchip technology inc. mcp98243 eeprom dc characteristics electrical specifications: unless otherwise indicated, v dd = 1.8v to 5.5v, gnd = ground, and t a = -20c to +125c. parameters sym min typ max unit conditions power supply operating voltage range v dd 1.8 5.5 v current, eeprom write i dd_ee 1100 2000 a sensor in shutdown mode (for t wc ), ( note 1) current, eeprom read i dd_ee 100 500 a sensor in shutdown mode ( note 1) power on reset (por) v por_ee 1.6 v eeprom write cycle time (byte/page) t wc 3 5 m s endurance t a = +25c 1m cycles number of write cycles, v dd = 5v (note 2) eeprom write temperature ee write 0 8 5 c eeprom read temperature ee read -40 125 c for minimum read temperature, see note 2 write protect voltage swp and cwp voltage v hv 7 12 v applied at a0 pin (note 3) pwp voltage v dd v note 1: for v dd ranges of 1.8v to the temperature sensor v por_ts , the temperature sensor becomes partially biased and consumes 80 a (typical) until the sensor po r resets and acknowledges a shutdown command. see figure 2-15 . 2: characterized but not production tested. for endurance estima tes in a specific applicati on, please consult the total endurance? model which can be obtained from microchips web site at www.microchip.com. 3: the range of voltage applied at a0 pin for permanent write protect is gnd to v dd + 1v. see figure 2-13 and section 5.3.3 write protection . input/output pin dc characteristics (note 1) electrical specifications: unless otherwise indicated, v dd = 1.8v to 5.5v, gnd = ground and t a = -20c to +125c. parameters sym min typ max units conditions serial input/output (scl, sda, a0, a1, a2) (note 2) input high-level voltage v ih 0.7v dd v low-level voltage v il 0 . 3 v dd v input current i in 5 a sda and scl only input impedance (a0, a1, a2) z in 1m v in > v ih input impedance (a0, a1, a2) z in 2 0 0k v in < v il output (sda only) low-level voltage v ol 0 . 4vi ol = 3 ma high-level current (leakage) i oh 1 a v oh = v dd low-level current i ol 6m a v ol = 0.6v capacitance c in 5p f sda and scl inputs hysteresis v hyst 0.05v dd vv dd > 2v 0 . 1 v dd vv dd < 2v spike supression t sp 50 ns note 1: these specifications apply for th e temperature sensor and eeprom. 2: for v dd ranges of 1.8v to the temperature sensor v por_ts , the temperature sens or becomes partially biased and consumes 80 a (typical) until the s ensor por resets and acknowledges a shutdown command. see figure 2-15 . downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 5 mcp9843/98243 sensor and eeprom se rial interface timing specifications electrical specifications: unless otherwise indicated, gnd = ground, t a = -20c to +125c, and c l = 80 pf ( note 1, 5 ). v dd = 1.8v to 5.5v v dd = 2.2v to 5.5v parameters sym min max min max units conditions 2-wire i 2 c interface serial port frequency f scl 10 100 10 400 khz note 2, 4 low clock t low 4700 1300 n s note 2 high clock t high 4000 600 n s note 2 rise time t r 1000 20 300 ns fall time t f 20 300 20 300 ns data in setup time t su:di 250 100 n s note 3 data in hold time t hd:di 0 0 n s note 6 data out hold time t hd:do 200 900 200 900 ns note 4 start condition setup time t su:sta 4700 600 n s start condition hold time t hd:sta 4000 600 n s stop condition setup time t su:sto 4000 600 n s bus idle t b:free 4700 1300 n s time out (sensor only) t out 25 35 ms v dd = 3.0v to 3.6v bus capacitive load c b 400 pf note 1: all values referred to v il max and v ih min levels. 2: if t low > t out or t high > t out , the temperature sensor i 2 c interface will time out. a repeat start command is required for communication. 3: this device can be used in a standard-mode i 2 c-bus system, but the requirement t su:dat 250 ns must be met. this device does not stretch scl low time. it outputs the next data bit to the sda line within t rmax + t su:di min = 1000 ns + 250 ns = 1250 ns (according to the standard-mode i 2 c-bus specification) before the scl line is released. 4: as a transmitter, the device provides internal minimum delay time t hd:dat min to bridge the undefined region (min. 300 ns) of the falling edge of scl t f max to avoid unintended generation of start or stop conditions. 5: for v dd ranges of 1.8v to the temperature sensor v por_ts , the temperature sens or becomes partially biased and consumes 100 a (typical) until the sensor por resets and acknowledges a shutdown com- mand. 6: as a receiver, sda should not be sampled at the falling edge of scl. sda can transition t hd:di 0ns after scl toggles low. downloaded from: http:/// mcp9843/98243 ds22153c-page 6 ? 2009 microchip technology inc. temperature characteristics timing diagram graphical symbol description electrical specifications: unless otherwise indicated, v dd = 1.8v to 5.5v for the eeprom, v dd = 3.0v to 3.6v for the temperature sensor, and gnd = ground. parameters sym min typ max units conditions temperature ranges specified temperature range t a -20 +125 c note 1 operating temperature range t a -40 +125 c storage temperature range t a -65 +150 c thermal package resistances thermal resistance, 8l-dfn ja 6 8 c / w thermal resistance, 8l-tdfn ja 52.5 c/w thermal resistance, 8l-tssop ja 139 c/w thermal resistance, 8l-udfn ja 4 1 c / w note 1: operation in this range must not cause t j to exceed maximum junction temperature (+150c). t s u:st o t su:d i t su:di t s u : s to t b:free s c l sda t hd : di / t hd: d o t high t low t o u t t r , t f start condition data transmission stop condition v dd v ih v il i in voltage current time v dd i oh voltage current time input output v ol i ol downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 7 mcp9843/98243 2.0 typical performance curves note: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground, sda/scl pulled-up to v dd , and t a = -40c to +125c. figure 2-1: average temperature accuracy. figure 2-2: temperature accuracy histogram, t a = +95c. figure 2-3: temperature accuracy histogram, t a = +75c. figure 2-4: supply current vs. temperature. figure 2-5: serial bus time-out vs. temperature. figure 2-6: power-on reset threshold voltage vs. temperature. note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purpose s only. the performance characteristics listed herein are not tested or guaranteed. in so me graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power suppl y range) and therefore outs ide the warranted range. -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 -40 -20 0 20 40 60 80 100 120 t a (c) temperature accuracy (c) v dd = 3.3v spec. limits 0% 10% 20% 30% 40% 50% 60% 70% -1.00 -0.75 -0.50 -0.25 0.000.25 0.50 0.75 1.00 temperature accuracy (c) occurrences t a = +95c v dd = 3.3v 221 units 0% 10% 20% 30% 40% 50% 60% 70% -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 temperature accuracy (c) occurrences t a = +75c v dd = 3.3v 221 units 1 10 100 1000 10000 -40 -20 0 20 40 60 80 100 120 t a (c) i dd (a) eeprom write (sensor in shutdown mode) sensor (eeprom inactive) eeprom read (sensor in shutdown mode) 25 30 35 -40-20 0 20406080100120 t a (c) t out (ms) v dd = 3.3v to 3.6v 0 0.5 1 1.5 2 2.5 3 -40-20 0 20406080100120 t a (c) v por (v) v por_ts v por_ee downloaded from: http:/// mcp9843/98243 ds22153c-page 8 ? 2009 microchip technology inc. note: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground, sda/scl pulled-up to v dd , and t a = -40c to +125c. figure 2-7: event and sda v ol vs. temperature. figure 2-8: conversion rate vs. temperature. figure 2-9: power supply rejection vs. frequency. figure 2-10: sda i ol vs. temperature. figure 2-11: temperature accuracy vs. v dd . figure 2-12: package thermal response. 0 0.1 0.2 0.3 0.4 -40 -20 0 20 40 60 80 100 120 t a (c) sda and event output (v) event v ol sda v ol i oh = i ol = 3 ma event (v dd - v oh ) 35 50 65 80 95 110 125 -40 -20 0 20 40 60 80 100 120 t a (c) t conv (ms) -1.0 -0.5 0.0 0.5 1.0 100 1,000 10,000 100,000 1,000,000 frequency (hz) normalized temp. error (c) c/ v dd , v dd = 3.3v + 150 mv pp (ac) 1k 10k 100k 1m 100k 1m 10k 100k 1m 1k 10k 100k 1m 100 1k 10k 100k 1m t a = 25c no decoupling capacitor 6 12 18 24 30 36 42 48 -40 -20 0 20 40 60 80 100 120 t a (c) sda i ol (ma) v ol = 0.6v -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 -40 -20 0 20 40 60 80 100 120 t a (c) temperature accuracy (c) c/ v dd = 0.4c/ v v dd = 2.7v v dd = 3.0v v dd = 3.6v v dd = 5.5v 0% 20% 40% 60% 80% 100% 120% -2 0 2 4 6 8 10 12 14 16 time (s) thermal response (%) 22c (air) to 125c (oil bath) tssop-8 dfn-8 downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 9 mcp9843/98243 note: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground, sda/scl pulled-up to v dd , and t a = -40c to +125c. figure 2-13: swp/cwp/pwp high voltage range. figure 2-14: shutdown current vs. temperature. figure 2-15: shutdown current vs. v dd . 0 2 4 6 8 10 12 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v dd (v) v hv (v) maximum pwp voltage (v dd + 1v) minimum swp/cwp voltage v hv applied at a0 pin. see table 5-4 for pins a1 and a2 connection no swp/cwp/pwp function within this range 0.00 0.50 1.00 1.50 2.00 2.50 3.00 -40 -20 0 20 40 60 80 100 120 t a (c ) i shdn (a) 0 20 40 60 80 100 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v dd (v) i shdn (a) v por_ts , sensor in shutdown mode t a = -40c t a = +25c t a = +85c t a = +125c downloaded from: http:/// mcp9843/98243 ds22153c-page 10 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 11 mcp9843/98243 3.0 pin description the descriptions of the pins are listed in table 3-1 . table 3-1: pin function tables 3.1 address pins (a0, a1, a2) these pins are device address input pins. the address pins correspond to the least significant bits (lsb) of address bits. the most significant bits (msb) (a6, a5, a4, a3). this is shown in ta b l e 3 - 2 . the a0 address pin is a multi-function pin. this input pin is also used for high voltge input v hv to enable the eeprom software write protect feature, see section 5.3.3 write protection . all address pin have an internal pull-down resistors. 3.2 ground pin (gnd) the gnd pin is the system ground pin. 3.3 serial data line (sda) sda is a bidirectional input/ output pin, used to serially transmit data to/from the host controller. this pin requires a pull-up resistor. (see section 4.0 serial communication ). 3.4 serial clock line (scl) the scl is a clock input pin. all communication and timing is relative to the signal on this pin. the clock is generated by the ho st or master controller on the bus. (see section 4.0 serial communication ). 3.5 temperature alert, open-drain output (event) the mcp9843/98243 temperature event output pin is an open-drain output. the device outputs a signal when the ambient temperat ure goes beyond the user- programmed temperature limit. (see section 5.2.3 event output configuration ). 3.6 power pin (v dd ) v dd is the power pin. the operating voltage range, as specified in the dc electric al specification table, is applied on this pin. 3.7 exposed thermal pad (ep) there is an internal electrical connection between the exposed thermal pad (ep) and the gnd pin; they can be connected to the same potential on the printed cir- cuit board (pcb). this provides better thermal conduc- tion from the pcb to the die. mcp9843/98243 symbol description dfn, tdfn, udfn tssop 1 1 a0 slave address and eeprom soft ware write protect high voltage input (v hv ) 2 2 a1 slave address 3 3 a2 slave address 4 4 gnd ground 5 5 sda serial data line 6 6 scl serial clock line 7 7 event temperature alert output 88 v dd power pin 9 ep exposed thermal pad (ep); can be connected to gnd. table 3-2: mcp9843/98243 address byte device address code slave address a6 a5 a4 a3 a2 a1 a0 sensor 0 0 1 1 xxx eeprom 1 0 1 0 eeprom write protect 0110 note: user-selectable address is shown by x. downloaded from: http:/// mcp9843/98243 ds22153c-page 12 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 13 mcp9843/98243 4.0 serial communication 4.1 2-wire standard mode i 2 c? protocol-compatible interface the mcp9843/98243 serial clock input (scl) and the bidirectional serial data line (sda) form a 2-wire bidirectional standard mode i 2 c compatible communication port (refer to the input/output pin dc characteristics (note 1) table and sensor and eeprom serial interfac e timing specifications table). the following bus protocol has been defined: table 4-1: mcp9843/98243 serial bus protocol descriptions 4.1.1 data transfer data transfers are initiated by a start condition (start), followed by a 7-bit device address and a read/write bit. an acknowledge (ack) from the slave confirms the reception of each byte. each access must be terminated by a stop condition (stop). repeated communication is initiated after t b-free . this device does not support sequential register read/ write. each register needs to be addressed using the register pointer. this device supports the receive protocol. the register can be specified using the pointer for the initial read. each repeated read or receive begins with a start condition and address byte. the mcp9843/98243 retain the previously selected register. therefore, they output data from the prev iously-specified register (repeated pointer specific ation is not necessary). 4.1.2 master/slave the bus is controlled by a master device (typically a microcontroller) that controls the bus access and generates the start and stop conditions. the mcp9843/98243 is a slave de vice and does not control other devices in the bus. both master and slave devices can operate as either transmitter or receiver. however, the master device determines which mode is activated. 4.1.3 start/stop condition a high-to-low transition of the sda line (while scl is high) is the start condition. all data transfers must be preceded by a start conditi on from the master. a low- to-high transition of the sda line (while scl is high) signifies a stop condition. if a start or stop condition is introduced during data transmission, the mcp9843/98243 releases the bus. all data transfers are ended by a stop condition from the master. 4.1.4 address byte following the start condition, the host must transmit an 8-bit address byte to the mcp9843/98243. the address for the mcp9843/98243 temperature sensor is 0011,a2,a1,a0 in binary, where the a2, a1 and a0 bits are set externally by connecting the corresponding pins to v dd 1 or gnd 0 . the 7-bit address transmitted in the serial bit stream must match the selected address for the mcp9843/98243 to respond with an ack. bit 8 in the address byte is a read/write bit. setting this bit to 1 commands a read operation, while 0 commands a write operation (see figure 4-1 ). figure 4-1: device addressing. term description master the device that co ntrols the serial bus, typically a microcontroller. slave the device addressed by the master, such as the mcp9843/98243. transmitter device sending data to the bus. receiver device receiving data from the bus. start a unique signal from master to initiate serial interface with a slave. stop a unique signal from the master to terminate serial interface from a slave. read/write a read or write to the mcp9843/98243 registers. ack a receiver acknowledges (ack) the reception of each byte by polling the bus. nak a receiver not-acknowledges (nak) or releases the bus to show end-of-data (eod). busy communication is not possible because the bus is in use. not busy the bus is in the idle state, both sda and scl remain high. data valid sda must remain stable before scl becomes high in order for a data bit to be considered valid. during normal data transfers, sda only changes state while scl is low. 123456789 scl sda 0 0 1 1 a2 a1 a0 start address byte slave address r/w mcp9843/98243 response code address ac k downloaded from: http:/// mcp9843/98243 ds22153c-page 14 ? 2009 microchip technology inc. 4.1.5 data valid after the start condition, each bit of data in transmission needs to be settled for a time specified by t su-data before scl toggles from low-to-high (see sensor and eeprom seri al interface timing specifications on page 5 ). 4.1.6 acknowledge (ack/nak) each receiving device, when addressed, is obliged to generate an ack bit after the reception of each byte. the master device must generate an extra clock pulse for ack to be recognized. the acknowledging device pulls down the sda line for t su-data before the low-to-high transition of scl from the master. sda also needs to remain pulled down for t h-data after a high-to-low transition of scl. during read, the master must signal an end-of-data (eod) to the slave by not generating an ack bit (nak) once the last bit has been clocked out of the slave. in this case, the slave will leave the data line released to enable the master to generate the stop condition. 4.1.7 time out (mcp9843/98243, sensor only) if the scl stays low or high for time specified by t out , the mcp9843/98243 temperature sensor resets the serial interface. this dictates the minimum clock speed as specified in the specification. however, the eeprom does not reset t he serial interface. therefore, the master can hol d the clock indefinitely to process data from the eeprom. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 15 mcp9843/98243 5.0 functional description the mcp9843/98243 temperatur e sensors consists of a band-gap type temperature sensor, a delta-sigma analog-to-digital converter ( ? adc), user-program- mable registers and a 2-wire i 2 c protocol compatible serial interface. figure 5-1 shows a block diagram of the register structure. figure 5-1: functional block diagram. clear event 0.5c/bit 0.25c/bit 0.125c/bit 0.0625c/bit temperature t upper t lower configuration ? adc band-gap temperature sensor event status output control critical event only event polarity event comp/int t crit capability temp. range accuracy output feature register pointer critical trip lock alarm win. lock bit shutdown hysteresis manufacturer id resolution memory control logic address standard array write write protect circuitry sense amp r/w control protected (00h-7fh) (80h-ffh) device id/rev selected resolution hv generator decoder array x address decoder y standard i 2 c interface a0 a1 a2 event sda scl v dd gnd i 2 c bus time-out accepts v hv shutdown status mcp9843/98243 temperature sensor mcp98243 eeprom downloaded from: http:/// mcp9843/98243 ds22153c-page 16 ? 2009 microchip technology inc. 5.1 registers the mcp9843/98243 device has several registers that are user-accessible. these registers include the capability register, conf iguration register, event temperature upper-boundary and lower-boundary trip registers, critical temperature trip register, temperature register, m anufacturer identification register and device id entification register. the temperature register is read-only, used to access the ambient temperature data. the data is loaded in parallel to this register after t conv . the event temperature upper-boundary and lower-boundary trip registers are read/writes. if the ambient temperature drifts beyond the user-specified limits, the mcp9843/98243 device outputs a signal using the event pin (refer to section 5.2.3 event output configuration ). in addition, the critical temperature trip register is used to provide an additional critical temperature limit. the capability register is used to provide bits describing the mcp9843/98243s capability in measurement resolution, measurement range and device accuracy. the device configuration register provides access to configure the mcp9843/98243s various features. these registers are described in further detail in the following sections. the registers are accessed by sending a register pointer to the mcp9843/98243 using the serial interface. this is an 8-bit write-only pointer. however, the four least significant bits are used as pointers and all unused bits (bits 7-4) need to be cleared or set to 0 . register 5-1 describes the pointer or the address of each register. register 5-1: register pointer (write only) w-0 w-0 w-0 w-0 w-0 w-0 w-0 w-0 pointer bits bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 7-4 writable bits: write 0 bit 3-0 pointer bits: 0000 = capability register 0001 = configuration register (config) 0010 = event temperature upper-boundary trip register (t upper ) 0011 = event temperature lowe r-boundary trip register (t lower ) 0100 = critical temperature trip register (t crit ) 0101 = temperature register (t a ) 0110 = manufacturer id register 0111 = device id/revision register 1000 = resolution register 1xxx = reserved (this device has additional register s that are reserved for test and calibration. if these registers are accessed, the device may not perform according to the specification.) downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 17 mcp9843/98243 table 5-1: bit assignment summary fo r all temperature sensor registers (see section 5.4) register pointer (hex) msb/ lsb bit assignment 76543210 0x00 msb 0 0 0 0 0 0 0 0 lsb shdn status t out range v hv resolution range accuracy event 0x01 msb 0 0 0 0 0 hysteresis shdn lsb crt loc win loc int clr evt stat evt cnt evt sel evt pol evt mod 0x02 msb 0 0 0 sign 2 7 c 2 6 c 2 5 c 2 4 c lsb 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c 0 0 0x03 msb 0 0 0 sign 2 7 c 2 6 c 2 5 c 2 4 c lsb 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c 0 0 0x04 msb 0 0 0 sign 2 7 c 2 6 c 2 5 c 2 4 c lsb 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c 0 0 0x05 msb t a t crit t a > t upper t a < t lower sign 2 7 c 2 6 c 2 5 c 2 4 c lsb 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c 2 -3 c 2 -4 c 0x06 msb 0 0 0 0 0 0 0 0 lsb 0 1 0 1 0 1 0 0 0x07 mcp98243 msb 0 0 1 0 0 0 0 1 lsb 0 0 0 0 0 0 0 1 0x07 mcp9843 msb 0 0 0 0 0 0 0 0 lsb 0 0 0 0 0 0 0 1 0x08 lsb 0 0 0 0 0 0 0 1 downloaded from: http:/// mcp9843/98243 ds22153c-page 18 ? 2009 microchip technology inc. 5.1.1 capability register this is a read-only register used to identify the temperature sensor capability. for example, the mcp9843/98243 device is capable of providing temperature at 0.25c resolution, measuring temperature below and above 0c, providing 1c and 2c accuracy over the active and monitor temperature ranges (respectively) and providing user- programmable temperature event boundary trip limits. register 5-2 describes the capability register. these functions are described in further detail in the following sections. register 5-2: capability register (read-only) address 0000 0000b u-0 u-0 u-0 u-0 u-0 u-0 u-0 u-0 bit 15 bit 8 r-1 r-1 r-1 r-0 r-1 r-1 r-1 r-1 shdn status t out range v hv resolution meas range accuracy temp alarm bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-8 unimplemented: read as 0 bit 7 event output status during shutdown (shdn status): 0 = event output remains in previous state. if the output asserts before shutdown command, it remains asserted during shutdown. 1 = event output de-asserts during shutdown. after shutdown, it takes t conv to re-assert the event output (power-up default) bit 6 i 2 c bus time-out (t out range): 0 = bus time-out range is 10 ms to 60 ms 1 = bus time-out range is 25 ms to 35 ms (power-up default) bit 5 high voltage input 0 = pin a0 does not accept high voltage 1 = pin a0 accepts high voltage for the eepro m write protect feature (power-up default) bit 4-3 resolution: 00 = 0.5c 01 = 0.25c (power up default) 10 = 0.125c 11 = 0.0625c these bits reflect the selected resolution (see section 5.2.4 temperature resolution ) bit 2 temperature measurement range (meas. range): 0 =t a = 0 (decimal) for temperature below 0c 1 = the part can measure temper ature below 0c (power-up default) downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 19 mcp9843/98243 figure 5-2: timing diagram for reading th e capability register (see section 4.0 serial communication ). bit 1 accuracy: 0 = accuracy 2c from +75c to +95c (active range) and 3c from +40c to +125c (monitor range) 1 = accuracy 1c from +75c to +95c (active range) and 2c from +40c to +125c (monitor range) bit 0 temperature alarm: 0 = no defined function (this bit will never be cleared or set to 0) 1 = the part has temperature boundary trip limits (t upper /t lower /t crit registers) and a temperautre event output (jc 42.4 required feature) register 5-2: capability register (read-only) address 0000 0000b (continued) sda ac k 0011 a capability pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 0011 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r mcp9843/98243 mcp9843/98243 mcp9843/98243 master master w sda scl 000 00000 000 00001 111 downloaded from: http:/// mcp9843/98243 ds22153c-page 20 ? 2009 microchip technology inc. 5.1.2 sensor configuration register (config) the mcp9843/98243 device has a 16-bit configuration register (config) that allows the user to set various functions for a robust te mperature monitoring system. bits 10 thru 0 are used to select event output boundary hysteresis, device shutdown or low-power mode, temperature boundary and cr itical temperature lock, temperature event output enable/disable. in addition, the user can select the ev ent output condition (output set for t upper and t lower temperature boundary or t crit only), read event output status and set event output polarity and mode (comparator output or interrupt output mode). the temperature hysteresis bits 10 and 9 can be used to prevent output chatter when the ambient temperature gradually ch anges beyond the user- specified temperature boundary (see section 5.2.2 temperature hysteresis (t hyst ) . the continuous conversion or shutdown mode is selected using bit 8. in shutdown mode, the band gap temperature sensor circuit stops converting temperature and the ambient temperature register (t a ) holds the previous successfully converted temperature data (see section 5.2.1 shutdown mode ). bits 7 and 6 are used to lock the user-specified boundaries t upper , t lower and t crit to prevent an accidental rewrite. bits 5 thru 0 are used to configure the temperature event output pin. all functions are described in register 5-3 (see section 5.2.3 event output configuration ). register 5-3: configuration register (config) address 0000 0001b u-0 u-0 u-0 u-0 u-0 r/w-0 r/w-0 r/w-0 t hyst shdn bit 15 bit 8 r/w-0 r/w-0 r/w-0 r-0 r/w-0 r/w-0 r/w-0 r/w-0 crit. lock win. lock int. clear event stat. e vent cnt. event sel. event pol. event mod. bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-11 unimplemented: read as 0 bit 10-9 t upper and t lower limit hysteresis (t hyst ): 00 = 0c (power-up default) 01 = 1.5c 10 = 3.0c 11 = 6.0c (refer to section 5.2.3 event output configuration ) this bit can not be altered when either of the lock bits are set (bit 6 and bit 7). this bit can be programmed in shutdown mode. bit 8 shutdown mode (shdn): 0 = continuous conversion (power-up default) 1 = shutdown (low-power mode) in shutdown, all power-consuming activities are disabled, though all registers can be written to or read. event output will de-assert. this bit cannot be set 1 when either of the lock bits is set (bit 6 and bit 7). however, it can be cleared 0 for continuous conversion while locked (refer to section 5.2.1 shutdown mode ). downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 21 mcp9843/98243 bit 7 t crit lock bit (crit. lock): 0 = unlocked. t crit register can be wri tten. (power-up default) 1 = locked. t crit register can not be written when enabled, this bit remains set 1 or locked until cleared by internal reset ( section 5.4 summary of power-on default ). this bit does not require a double-write. this bit can be programmed in shutdown mode. bit 6 t upper and t lower window lock bit (win. lock): 0 = unlocked. t upper and t lower registers can be writ ten. (power-up default) 1 = locked. t upper and t lower registers can not be written when enabled, this bit remains set 1 or locked until cleared by power-on respell ( section 5.4 sum- mary of power-on default ). this bit does not require a double-write. this bit can be programmed in shutdown mode. bit 5 interrupt clear (int. clear) bit: 0 = no effect (power-up default) 1 = clear interrupt output. when read this bit returns 0 this bit clears the interrupt flag which de-asserts ev ent output. in shutdown mode, the event output is always de-asserted. therefore, setting this bit in sh utdown mode clears the interrupt after the device returns to normal operation. bit 4 event output status (event stat.) bit: 0 = event output is not asserted by the device (power-up default) 1 = event output is asserted as a comparator /interrupt or critic al temperature output in shutdown mode this bit will clear because event output is always de-asserted in shutdown mode. bit 3 event output contro l (event cnt.) bit: 0 = event output disabl ed (power-up default) 1 = event output enabled this bit can not be altered when either of the lock bits is set (bit 6 and bit 7). this bit can be programmed in shutdown mode, but event output will remain de-asserted. bit 2 event output select (event sel.) bit: 0 = event output for t upper , t lower and t crit (power-up default) 1 = t a t crit only. (t upper and t lower temperature boundaries are disabled.) when the alarm window lock bit is set, this bit cannot be altered until unlocked (bit 6). this bit can be programmed in shutdown mode, but event output will remain de-asserted. bit 1 event output polarity (event pol.) bit: 0 = active low (power-up default. pull-up resistor required) see section 5.2.3 event output configuration 1 = active-high (pull-down resistor required) see section 5.2.3 event output configuration this bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). this bit can be programmed in shutdown mode, but event output will remain de-asserted. bit 0 event output mode (event mod.) bit: 0 = comparator output (power-up default) 1 = interrupt output this bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). this bit can be programmed in shutdown mode, but event output will remain de-asserted. register 5-3: configuration register (config) address 0000 0001b downloaded from: http:/// mcp9843/98243 ds22153c-page 22 ? 2009 microchip technology inc. figure 5-3: timing diagram for writing to the configuration register (see section 4.0 serial communication . writing to the config register to enable the event output pin <0000 0000 0000 1000>b. sda ac k 0011 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte w mcp9843/98243 mcp9843/98243 msb data ac k ac k p 12345678 12345678 lsb data configuration pointer mcp9843/98243 mcp9843/98243 001 00000 000 00001 000 note: this is an example routine: i2c_start(); // send start command i2c_write(addressbyte & 0xfe); //write command //also, make sure bit 0 is cleared 0 i2c_write(0x01); // write config register i2c_write(0x00); // write data i2c_write(0x08); // write data i2c_stop(); // send stop command downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 23 mcp9843/98243 figure 5-4: timing diagram for reading from the configuration register (see section 4.0 serial communication ). sda ac k 0011 a configuration pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 0011 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r mcp9843/98243 mcp9843/98243 mcp9843/98243 master master w sda scl 001 00000 000 00001 000 reading the config register. note: it is not necessary to select the register pointer if it was set from the previous read/write. note: this is an example routine: i2c_start(); // send start command i2c_write(addressbyte & 0xfe); //write command //also, make sure bit 0 is cleared 0 i2c_write(0x01); // write config register i2c_start(); // send repeat start command i2c_write(addressbyte | 0x01); //read command //also, make sure bit 0 is set 1 upperbyte = i2c_read(a ck); // read 8 bits //and send ack bit lowerbyte = i2c_read (nak); // read 8 bits //and send nak bit i2c_stop(); // send stop command downloaded from: http:/// mcp9843/98243 ds22153c-page 24 ? 2009 microchip technology inc. 5.1.3 upper/lower/critical temperature limit registers (t upper /t lower /t crit ) the mcp9843/98243 device has a 16-bit read/write event output temperature upper-boundary trip register (t upper ), a 16-bit lower-boundary trip register (t lower ) and a 16-bit critical boundary trip register (t crit ) that contains 11-bit data in twos complement format (0.25c). this data represents the maximum and minimum temperature boundary or temperature window that c an be used to monitor ambient temperature. if this feature is enabled ( section 5.1.2 sensor configuration register (config) ) and the ambient temperature exceeds the specified boundary or window, the mcp9843/98243 asserts an event output. (refer to section 5.2.3 event output configuration ). register 5-4: upper/lower/critica l temperature limit register (t upper /t lower / t crit ) address 0000 0010b/0000 0011b / 0000 0100b (note 1) u-0 u-0 u-0 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 s i g n2 7 c 2 6 c 2 5 c 2 4 c bit 15 bit 8 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 u-0 u-0 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-13 unimplemented: read as 0 bit 12 sign: 0 =t a 0c 1 =t a < 0c bit 11-2 t upper /t lower /t crit : temperature boundary trip data in twos complement format. bit 1-0 unimplemented: read as 0 note 1: this table shows two 16-bit registers for t upper , t lower and t crit located at 0000 0010b , 0000 0011b and 0000 0100b , respectively. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 25 mcp9843/98243 figure 5-5: timing diagram for writing and reading from the t upper register (see section 4.0 serial communication ). sda ac k 0011 a t upper pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 0011 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r mcp9843/98243 mcp9843/98243 mcp9843/98243 master master w sda scl 010 00000 101 10100 000 reading from the t upper register. writing 90c to the t upper register <0000 0101 1010 0000>b. sda ac k 0011 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte w mcp9843/98243 mcp9843/98243 msb data ac k ac k p 12345678 12345678 lsb data t upper pointer mcp9843/98243 mcp9843/98243 010 00000 101 10100 000 note: it is not necessary to select the register pointer if it was set from the previous read/write. downloaded from: http:/// mcp9843/98243 ds22153c-page 26 ? 2009 microchip technology inc. 5.1.4 ambient temperature register (t a ) the mcp9843/98243 device uses a band gap temperature sensor circuit to output analog voltage proportional to absolute te mperature. an internal ? adc is used to convert the analog voltage to a digital word. the converter resolution is set to 0.25c + sign (11-bit data). the digital word is loaded to a 16-bit read- only ambient temper ature register (t a ) that contains 11-bit temperature data in twos comple ment format. the t a register bits (bits 12 thru 0) are double-buffered. therefore, the user can access the register while, in the background, the mcp9843/98243 performs an analog- to-digital conversion. the temperature data from the ? adc is loaded in parallel to the t a register at t conv refresh rate. in addition, the t a register uses three bits (bits 15, 14 and 13) to reflect the event pin state. this allows the user to identify the cause of the event output trigger (see section 5.2.3 event output configuration ); bit 15 is set to 1 if t a is greater than or equal to t crit , bit 14 is set to 1 if t a is greater than t upper and bit 13 is set to 1 if t a is less than t lower . the t a register bit assignment and boundary conditions are described in register 5-5 . register 5-5: ambient temperature register (t a ) address 0000 0101b (note 1) r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 t a vs. t crit t a vs. t upper t a vs. t lower sign 2 7 c 2 6 c 2 5 c 2 4 c bit 15 bit 8 r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 2 3 c 2 2 c 2 1 c 2 0 c 2 -1 c 2 -2 c 2 -3 c 2 -4 c bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15 t a vs. t crit (1) bit: 0 =t a < t crit 1 =t a t crit bit 14 t a vs. t upper (1) bit: 0 =t a t upper 1 =t a > t upper bit 13 t a vs. t lower (1) bit: 0 =t a t lower 1 =t a < t lower bit 12 sign bit: 0 =t a 0c 1 =t a < 0c bit 11-0 ambient temperature (t a ) bits: (note 2) 12-bit ambient temperature data in twos complement format. note 1: bits 15, 14 and 13 are not affected by t he status of the event output configuration (bits 5 to 0 of config) ( register 5-3 ). 2: bits 2, 1, and 0 may remain clear '0' depending on the status of the resolution register ( register 5-9 ). the power-up default is 0.25c/bit, bits 1 and 0 remain clear '0' . downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 27 mcp9843/98243 5.1.4.1 t a bits to temperature conversion to convert the t a bits to decimal temperature, the upper three boundary bits (bits 15, 14 and 13) must be masked out. then determine the sign bit (bit 12) to check positive or negative temperature, shift the bits accordingly and combine the upper and lower bytes of the 16-bit register. the upper byte contains data for temperatures greater than 32c while the lower byte contains data for temperature less than 32c, including fractional data. when combinding the upper and lower bytes, the upper byte must be right-shifted by 4bits (or multiply by 2 4 ) and the lower byte must be left-shifted by 4 bits (or multiply by 2 -4 ). adding the results of the shifted values provides the temperature data in decimal format, see equation 5-1 . the temperature bits are in twos compliment format, therefore, postive temperat ure data and negative tem- perature data are computed differently. equation 5-1 shows the temperature computation. the example instruction code outlined in figure 5-6 shows the communication flow, also see figure 5-7 for timing diagram. equation 5-1: bytes to temperature conversion figure 5-6: example instruction code. where: t a = ambient temperature (c) upperbyte = t a bit 15 to bit 8 lowerbyte = t a bit 7 to bit 0 temperature 0c temperature < 0c t a upperbyte 2 4 lowerbyte 2 4 C + () = t a 256 upperbyte 2 4 lowerbyte 2 4 C + () C = i2c_start(); // send start command i2c_write(addressbyte & 0xfe); //write command //also, make sure bit 0 is cleared 0 i2c_write(0x05); // write t a register address i2c_start(); //repeat start i2c_write(addressbyte | 0x01); // read command //also, make sure bit 0 is set 1 upperbyte = i2c_read(ack); // read 8 bits //and send ack bit lowerbyte = i2c_read(nak); // read 8 bits //and send nak bit i2c_stop(); // send stop command //convert the temperature data //first check flag bits if ((upperbyte & 0x80) == 0x80){ //t a t crit } if ((upperbyte & 0x40) == 0x40){ //t a > t upper } if ((upperbyte & 0x20) == 0x20){ //t a < t lower } upperbyte = upperbyte & 0x1f; //clear flag bits if ((upperbyte & 0x10) == 0x10){ //t a < 0c upperbyte = upperbyte & 0x0f; //clear sign temperature = 256 - (upperbyte x 16 + lowerbyte / 16); }else //t a 0c temperature = (upperbyte x 16 + lowerbyte / 16); // temperature = ambient temperature (c) this example routine assumes the variables and i 2 c communication subroutines are predefined: downloaded from: http:/// mcp9843/98243 ds22153c-page 28 ? 2009 microchip technology inc. figure 5-7: timing diagram for reading +25.25c temperature from the t a register (see section 4.0 serial communication ). sda ac k 0011 a t a pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 0011 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r mcp9843/98243 mcp9843/98243 mcp9843/98243 master master w sda scl 101 00000 001 10010 100 note: it is not necessary to select the register pointer if it was set from the previous read/write. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 29 mcp9843/98243 5.1.5 manufacturer id register this register is used to iden tify the manufacturer of the device in order to perform manufacturer specific operation. the manufacturer id for the mcp9843/ 98243 is 0x0054 (hexadecimal). figure 5-8: timing diagram for reading the manufacturer id register (see section 4.0 serial communication ). register 5-6: manufacturer id register (read-only) address 0000 0110b r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 manufacturer id bit 15 bit 8 r-0 r-1 r-0 r-1 r-0 r-1 r-0 r-0 manufacturer id bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-0 device manufacturer identification number . sda ac k 0011 a manuf. id pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 0011 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r mcp9843/98243 mcp9843/98243 mcp9843/98243 master master w sda scl 110 00000 000 01010 100 note: it is not necessary to select the register pointer if it was set from the previous read/write. downloaded from: http:/// mcp9843/98243 ds22153c-page 30 ? 2009 microchip technology inc. 5.1.6 device id and revision register the upper byte of this register is used to specify the device identification and the lower byte is used to specify device revision. the device id for the mcp98243 is 0x21 (hex) and the mcp9843 is 0x00 (hex). the revision (lower byte) begins with 0x00 (hex) for the first release, with the number being incremented as revised versions are released. the revision for both mcp9843 and mcp98243 is 0x01. register 5-7: mcp98243 device id and device revisi on (read-only) address 0000 0111b r-0 r-0 r-1 r-0 r-0 r-0 r-0 r-1 device id bit 15 bit 8 r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-1 device revision bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-8 device id: bit 15 to bit 8 are used for device id bit 7-0 device revision: bit 7 to bit 0 are used for device revision register 5-8: mcp9843 device id and device revision (read-only) address 0000 0111b r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 device id bit 15 bit 8 r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-1 device revision bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 15-8 device id: bit 15 to bit 8 are used for device id bit 7-0 device revision: bit 7 to bit 0 are used for device revision downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 31 mcp9843/98243 5.1.7 resolution register this register allows the user to change the sensor resolution (see section 5.2.4 temperature resolution ). the por default resolution is 0.25c. the selected resolution is also reflected in the capability register (see register 5-2 ). figure 5-9: timing diagram for changing t a resolution to 0.0625c <0000 0011>b (see section 4.0 serial communication ). register 5-9: resolution address 0000 1000b u-0 u-0 u-0 u-0 u-0 u-0 r/w-0 r/w-0 resolution bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 7-2 unimplemented: read as 0 bit 1-0 resolution: 00 = lsb = 0.5c (t conv = 30 ms typical) 01 = lsb = 0.25c (power up default, t conv = 65 ms typical) 10 = lsb = 0.125c (t conv = 130 ms typical) 11 = lsb = 0.0625c (t conv = 260 ms typical) sda ac k 0011 a ac k s 2 a 1 a 0 12345678 12345678 scl address byte w mcp9843/98243 mcp9843/98243 ac k p 12345678 data resolution pointer mcp9843/98243 00001 000 00000 011 downloaded from: http:/// mcp9843/98243 ds22153c-page 32 ? 2009 microchip technology inc. 5.2 sensor feature description 5.2.1 shutdown mode shutdown mode disables all power-consuming activities (including temperature sampling operations) while leaving the serial interface active. this mode is selected by setting bit 8 of config to 1 . in this mode, the device consumes i shdn . it remains in this mode until bit 8 is cleared 0 to enable continuous conversion mode, or until power is recycled. the shutdown bit (bit 8) cannot be set to 1 while bits 6 and 7 of config (lock bits) are set to 1 . however, it can be cleared 0 or returned to continuous conversion while locked. in shutdown mode, all registers can be read or written. however, the serial bus activity increases the shutdown current. if the device is shutdown while the event pin is asserted, then the event output will be de-asserted during shutdown. it will remain de-asserted until the device is enabled for normal operation. once the device is enabled it takes tconv before the device re-asserts the event output. 5.2.2 temperature hysteresis (t hyst ) a hysteresis of 0c, 1.5c, 3c or 6c can be selected for the t upper , t lower and t crit temperate boundaries using bits 10 and 9 of config. the hysteresis applies for decr easing temperature only (hot to cold), or as temperatur e drifts below the specified limit. the hysteresis bits can not be changed if either of the lock bits, bits 6 and 7 of config, are set to 1 . the t upper , t lower and t crit boundary conditions are described graphically in figure 5-2 . 5.2.3 event output configuration the event output can be enabled using bit 3 of config (event output control bit) and can be configured as either a compar ator output or as interrupt output mode using bit 0 of config (event mode). the polarity can also be specified as an active-high or active-low using bit 1 of config (event polarity). when active-high output is selected, a pull-down resistor is requried on the event pin. when active-low output is selected, a pull-up resistor is required on the event pin, see figure 5-10 and figure 5-11 for graphical circuit description. these configurations are designed to serve processors with low-to-high or high-to-low edge triggered inputs. with these configurations, when the event output de-asserts, power will not be dissipated across the pull-up or pull-down resistors. when the ambient temperature increases above the critical temperature limit, th e event output is forced to a comparator output (regardless of bit 0 of config). when the temperature drifts below the critical temperature limit minus hysteresis, the event output automatically returns to the state specified by bit 0 of config. figure 5-10: active-high event output configuration. figure 5-11: active-low event output configuration. the status of the event output can be read using bit 4 of config (event status). this bit can not be set to 1 in shutdown mode. bit 7 and 6 of the config register can be used to lock the t upper , t lower and t crit registers. the bits prevent false triggers at the event output due to an accidental rewrite to these registers. the event output can also be used as a critical temperature output using bi t 2 of config (critical output only). when this feature is selected, the event output becomes a comparator output. in this mode, the interrupt output configuration (bit 0 of config) is ignored. mcp9843/98243 event output r pd v dd mcp9843/98243 event output r pu v dd downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 33 mcp9843/98243 5.2.3.1 comparator mode comparator mode is selected using bit 0 of config. in this mode, the event output is asserted as active-high or active-low using bit 1 of config. figure 5-12 shows the conditions that togg le the event output. if the device enters shutdown mode with asserted event output, the output will de-assert. it will remain de- asserted until the device enters continuous conver- sion mode and after the first temperature conversion is completed, t conv . after the initial temperature conver- sion, t a must satisfy the t upper or t lower boundary conditions in order for event output to be asserted. comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. 5.2.3.2 interrupt mode in the interrupt mode, the event output is asserted as active-high or active-low (depending on the polarity configuration) when t a drifts above or below t upper and t lower limits. the output is deasserted by setting bit 5 (interrupt clear) of config. if the device enters shutdown mode with asserted event output, the output will de-assert. it will remain de-asserted until the device enters continuous conversion mode and after the first temperature conversion is completed, t conv . if the inter- rupt clear bit (bit 5) is nev er set, then the event output will re-assert after the first temperature conversion. in addition, if t a >= t crit the event output is forced as comparator mode and asserts until t a < t crit - t hyst . while the event output is asse rted, user must send clear interrupt command (bit 5 of config) for event output to de-assert, when temperature drops below the critical limit, t a < t crit - t hyst . otherwise, event output remains asserted (see figure 5-12 for graphical descrip- tion). switching from interr upt mode to comparator mode also de-asserts event output. this mode is designed for inte rrupt driven microcontroller based systems. the microcontroller receiving the interrupt will have to acknowledge the interrupt by setting bit 5 of config register from the mcp9843/98243. 5.2.4 temperature resolution the mcp9843/98243 device is capable of providing a temperature data with 0.5c to 0.0625c resolution. the resolution can selected using the resolution register ( register 5-9 ) which is located in address 00001000 b. this address location is not specified in jedec standard jc42.4. however, it provides additional flexibility while being functionally compatible with jc42.4 and provide a 0.25c resolution at 125 ms (max.). the selected resolution can be read by user using bit 4 and bit 3 of the capability register ( register 5-2 ). a 0.25c resolution is set as por default by factory. table 5-2: temperature conversion time resolution t conv (ms) samples/sec (typical) 0.5c 30 33 0.25c (power-up default) 65 15 0.125c 130 8 0.0625c 260 4 downloaded from: http:/// mcp9843/98243 ds22153c-page 34 ? 2009 microchip technology inc. figure 5-12: event output condition. t upper t lower event output t crit t a t upper - t hyst (active-low) comparator interrupt s/w int. clear critical only t crit - t hyst 1 2 3 4 5 7 table 5-10: temperature event output conditions note output boundary conditions comparator interrupt critical t a bits output state (active low/high) 15 14 13 1t a t lower high/low low/high high/low 0 0 0 2t a < t lower - t hyst low/high low/high high/low 0 0 1 3t a > t upper low/high low/high high/low 0 1 0 4 t a t upper - t hyst high/low low/high high/low 0 0 0 5 t a t crit low/high low/high low/high 1 1 0 6 when t a t crit the event output is forced to comparat or mode and bits 0 of config (event output mode) is ignored until t a < t crit - t hyst . in the interrupt mode, if interrupt is not cleared (bits 5 of config) as shown in the diagram at note 6 , then event will remain asserted at note 7 until interrupt is cleared by the controller. 7t a < t crit - t hyst low/high high/low high/low 0 1 0 t lower - t hyst t lower -t hyst t upper - t hyst 1 3 4 2 note: 6 event output (active-high) comparator interrupt s/w int. clear critical only downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 35 mcp9843/98243 5.3 mcp98243 eeprom feature description 5.3.1 byte write to write a byte in the mcp98243 eeprom, the master has to specify the memory location or address. once the address byte is transmitted correctly followed by a word address, the word address is stored in the eeprom address pointer. th e following byte is data to be stored in the specified memory location. figure 5- 13 shows the timing diagram. figure 5-13: timing diagram for byte write (see section 4.0 serial communication ). sda ac k 1010 a ac k s 2 a 1 a 0 12345678 12345678 scl address byte w mcp98243 mcp98243 ac k p 12345678 data word address mcp98243 xxxxx xx x xx xxx xxx downloaded from: http:/// mcp9843/98243 ds22153c-page 36 ? 2009 microchip technology inc. 5.3.2 page write the write address byte, word address and the first data byte are transmitted to the mcp98243 in the same way as in a byte write. instead of generating a stop condition, the master transmits up to 15 additional data bytes to the mcp98243, which are temporarily stored in the on-chip page buffer and will be written into the memory after the master has transmitted a stop condition. upon receipt of each word, the four lower order address pointer bits are internally incremented by one. the higher order four bits of the word address remain constant. if the master should transmit more than 16 bytes prior to generating the stop condition, the address counter will roll over and the previously received data will be overwritten. as with the byte write operation, once the stop condition is received, an internal write cycle will begin ( figure 5-14 ). figure 5-14: timing diagram for page write (see section 4.0 serial communication ). note: page write operations are limited to writing bytes within a single physical page, regardless of the number of bytes actually being written. physical page boundaries start at addresses that are integer multiples of the page buffer size (or page size) and end at addresses that are integer multiples of [page size - 1]. if a page write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (overwriting data previously stored there), instead of being written to the next page, as might be expected. it is therefore necessary for the application software to prevent page write operations that woul d attempt to cross a page boundary. sda ac k 1010 a xxxx ac k s 2 a 1 a 0 12345678 12345678 scl x address byte w mcp98243 mcp98243 data at (n) ac k p 12345678 12345678 data at (n+1) word address (n) mcp98243 mcp98243 xxx xxxxx xxx xxxxx xxx ac k data at (n+15) mcp98243 xxx xxx ac k note: n is the initial address for a page. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 37 mcp9843/98243 5.3.3 write protection the mcp98243 has a software write-protect (swp) feature that allows the lo wer half array (addresses 00h -7f h ) to be write-protected or permanently write- protected (pwp). the wr ite protected area can be cleared by sending clear write protect (cwp) command. however, once the pwp is executed the protected memory can not be cleared. the device will not respond to the cwp command. to access write protection, the device address code of the address byte is set to 0110 instead of 1010 . the 1010 address code is used to access the memory area and the 0110 address code is used to access the write protection. once the device is write protected it will not acknowledge certain commands. table 5-3 shows the corresponding address bytes for the write protect feature. table 5-3: write protect device addressing (note 1) eeprom operation address pins address byte a2 a1 a0 address code slave address r/w a2 a1 a0 swp write gnd gnd v hv 0110 0 0 1 0 read 1 cwp write gnd v dd v hv 0110 0 1 1 0 read 1 pwp (note) write x x x 0110 xx x 0 read 1 note 1: the address pins are x or dont cares. however, the slave address bits need to match the address pins. for v hv voltage levels, refer to figure 2-13 . table 5-4: device response when writing data or accessing swp/cwp/pwp (note 1) status command ack address ack data byte ack write cycle not protected swp/cwp/pwp ack x ack x ack yes page/byte write ack address ack data ack yes protected with swp swp noack x noack x noack no cwp ack x ack x ack yes pwp ack x ack x ack yes page/byte write lower 128 bytes ack address ack data noack no permanently protected swp/cwp/pwp noack x noack x noack no page/byte write lower 128 bytes ack address ack data noack no note 1: x is defined as dont care. downloaded from: http:/// mcp9843/98243 ds22153c-page 38 ? 2009 microchip technology inc. 5.3.3.1 software write protect (swp) the swp feature is invoked by writing to the write- protect register. this is done by sending an address byte similar to a normal write command. figure 5-17 shows the timing diagram. swp can be cleared using the cwp command. see section 5.3.3.2 clear write protect (cwp) the slave address bits need to correspond to the address pin logic configuration. for swp, a high voltage v hv needs to be applied to the a0 pin and the corresponding slave address needs to be set to 1 , as shown in table 5-3 . both a2 and a1 pins are grounded and the corresponding slave address bits are set to 0 . the device response in this mode is shown in ta b l e 5 - 4 and ta b l e 5 - 5 . figure 5-15: timing diagram for setting software write protect (see section 4.0 serial communication ). 5.3.3.2 clear write protect (cwp) the cwp feature is invoked by writing to the clear write-protect register. this is done by sending an address byte similar to a normal write command. figure 5-17 shows the timing diagram. cwp clears swp only. pwp can not be cleared using this command. the slave address bits need to correspond to the address pin logic configuration. for cwp, a high voltage v hv needs to be applied to the a0 pin and the corresponding slave address needs to be set to 1 . the a1 pin is set to v dd and the corresponding slave address bit is set to 1 . and a2 pins is set to ground and the corresponding slave address bits are set to 0 . table 5-3 shows the bit configuration. the device response in this mode is shown in ta b l e 5 - 4 and table 5-5 . figure 5-16: timing diagram for setting clear write protect (see section 4.0 serial communication ). sda ac k 0110 ac k s 12345678 12345678 scl address byte w mcp98243 mcp98243 ac k p 12345678 data word address mcp98243 xxxxx xxx xxxxx xxx 001 note: apply v hv at a0 pin and connect gnd to a1 and a2 pins to initiate swp cycle. sda ac k 0110 ac k s 12345678 12345678 scl address byte w mcp98243 mcp98243 ac k p 12345678 data word address mcp98243 xxxxx xxx xxxxx xxx 011 note: apply v hv at a0 pin, apply v dd at a1 pin, connect a2 pin to gnd to initiate cwp cycle. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 39 mcp9843/98243 5.3.3.3 pwp (permanent write protect) once the pwp register is writ ten, the lower half of the memory will be permanent protected and the device will not acknowledge any command. the protected area of the memory can not be cleared, reversed, or re- written. if a write is attemp ted to the protected area, the device will acknowledge the address byte and word address but not the data byte. (see ta b l e 5 - 4 and table 5-5 ). unlike swp and cwp, a v hv is not applied on the a0 pin to execute pwp. the state of a2, a1, and a0 is user selectable. however, the address pin states need to match the slave address bits, as shown in table 5-3 . figure 5-17: timing diagram for setting permanent write protect (see section 4.0 serial communication ). note: once the permanent write-protect is executed, it cannot be reversed, even if the device power is cycled. see figure 2-13 for v hv voltage levels. sda ac k 0110 a ac k s 2 a 1 a 0 12345678 12345678 scl address byte w mcp98243 mcp98243 ac k p 12345678 data word address mcp98243 xxxxx xxx xxxxx xxx note: unlike swp and cwp, v hv must be within the range of gnd to v dd + 1v to execute pwp. see figure 2-13 and section 5.3.3 w rite protection . downloaded from: http:/// mcp9843/98243 ds22153c-page 40 ? 2009 microchip technology inc. 5.3.4 read operation read operations are initiated in the same way as write operations, with the exce ption that the r/w bit of the slave address is set to 1 . there are three basic types of read operations: current address read, random read and sequential read. 5.3.4.1 current address read the mcp98243 contains an address counter that maintains the address of the last word accessed, internally incremented by 1 . therefore, if the previous access (either a read or write operation) was to address n , the next current address read operation would access data from address n+1 . upon receipt of the slave address with r/w bit set to 1 , the mcp98243 issues an acknowledge and transmits the 8-bit data word. the master will not acknowledge (nak) the transfer but does generate a stop condition and the mcp98243 discontinues transmission ( figure 5-18 ). figure 5-18: reading current word address (see section 4.0 serial communication ). table 5-5: device response when reading swp/cwp/pwp (note) status command ack address ack data byte ack not protected swp/cwp/pwp ack x noack x noack protected with swp swp noack x noack x noack cwp ack x noack x noack pwp ack x noack x noack permanently protected swp/c wp/pwp noack x noack x noack note: x is defined as dont care. 1010 a ac k na k s p 2 a 1 a 0 12345678 12345678 address byte current word address r mcp98243 master sda scl 00000 000 note: in this example, the current word address is the previously accessed address location n plus 1. downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 41 mcp9843/98243 5.3.4.2 random read random read operations allow the master to access any memory location in a random manner. to perform this type of read operation, the word address must first be set. this is done by sending the word address to the mcp98243 as part of a write operation. once the word address is sent, the master generates a start condition following the acknowledge. this terminates the write operation, but not before the internal address pointer is set. the master then issues the address byte again, but with the r/w bit set to a 1 . the mcp98243 then issues an acknowledge and transmits the 8-bit data word. the master will not acknowledge the transfer but does generate a stop condition and the mcp98243 discontinues transmission ( figure 5-19 ). figure 5-19: timing diagram for random read (see section 4.0 serial communication ). sda ac k 1010 a word address (n) 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte mcp98243 mcp98243 w 000 1010 a ac k na k s p 2 a 1 a 0 12345678 12345678 address byte data at (n) r mcp98243 master sda scl xxxxx xxx note: in this example, n is the current address word which 00h and the data is the byte at address n. downloaded from: http:/// mcp9843/98243 ds22153c-page 42 ? 2009 microchip technology inc. 5.3.4.3 sequential read sequential reads are initiat ed in the same way as a random read, with the exception that after the mcp98243 transmits the first data byte, the master issues an acknowledge, as opposed to a stop condition in a random read. this directs the mcp98243 to transmit the next sequentially addressed 8-bit word ( figure 5-20 ). to provide sequential reads, the mcp98243 contains an internal address pointer, which is incremented by one at the completion of each operation. this address pointer allows the entire memo ry contents to be serially read during one operation. figure 5-20: timing diagram for sequential read (see section 4.0 serial communication ). 5.3.5 standby mode the design will incorporate a low power standby mode (i shdn ). standby mode will be entered after a normal termination of any operation and after all internal functions are complete. this would include any error conditions occurring, such as improper number of clock cycles or improper instruction byte as defined previously. sda ac k 1010 a xxxx ac k s 2 a 1 a 0 12345678 12345678 scl x address byte r mcp98243 mcp98243 data at (n+1) ac k 12345678 12345678 data at (n+2) data (n) 1 mcp98243 mcp98243 xxx xxxxx xxx xxxxx xxx data at (n+m) (1) xxx xxx ac k note 1: n is the initial address location and m is the final address location (n+m < 256) na k p master downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 43 mcp9843/98243 5.4 summary of power-on default the mcp9843/98243 has an internal power-on reset (por) circuit. if the power supply voltage v dd glitches down to the v por_ts and v por_ee thresholds, the device resets the registers to the power-on default settings. table 5-6 shows the power-on default summary for the temperature sensor. the eeprom resets the address pointer to 0x00 hex. table 5-6: mcp9843/98243 temperatur e sensor power-on reset defaults registers default register data (hexadecimal) power-up default register description address (hexadecimal) register name 0x00 capability 0x00ef event output de-asserts in shutdown i 2 c time out 25 ms to 35 ms. accepts v hv at a0 pin 0.25c measurement resolution measures temperature below 0c 1c accuracy over active range temperature event output 0x01 config 0x0000 comparator mode active-low output event and critical output output disabled event not asserted interrupt cleared event limits unlocked critical limit unlocked continuous conversion 0c hysteresis 0x02 t upper 0x0000 0c 0x03 t lower 0x0000 0c 0x04 t crit 0x0000 0c 0x05 t a 0x0000 0c 0x06 manufacturer id 0x0054 0x0054 (hex) 0x07 device id/ device revision for mcp98243 0x2101 0x2101 (hex) 0x07 device id/ device revision for mcp9843 0x0001 0x0001 (hex) 0x08 resolution 0x01 0x01 (hex) downloaded from: http:/// mcp9843/98243 ds22153c-page 44 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 45 mcp9843/98243 6.0 applications information 6.1 layout considerations the mcp9843/98243 device does not require any additional components besides the master controller in order to measure temperature. however, it is recom- mended that a decoupling capacitor of 0.1 f to 1 f be used between the v dd and gnd pins. a high- frequency ceramic capacitor is recommended. it is necessary for the capacitor to be located as close as possible to the power and ground pins of the device in order to provide effective noise protection. in addition, good pcb layout is key for better thermal conduction from the pcb temperature to the sensor die. for good temperature sensitivity, add a ground layer under the device pins as shown in figure 6-1 . 6.2 thermal considerations a potential for self-heating errors can exist if the mcp9843/98243 sda, sclk and event lines are heavily loaded with pull-ups (high current). typically, the self-heating error is negligible because of the relatively small current consumption of the mcp9843/ 98243. a temperature accuracy error of approximately 0.5c could result from self-heating if the communication pins sink/source the maximum current specified. for example, if the event out put is loaded to maximum i ol , equation 6-1 can be used to determine the effect of self-heating. equation 6-1: effect of self- heating at room temperature (t a = +25c) with maximum i dd = 500 a and v dd = 3.6v, the self-heating due to power dissipation t is 0.2c for the dfn-8 package and 0.5c for the tssop-8 package. figure 6-1: dfn package layout. t ja v dd i dd v ol_event i ol_event v ol_sda i ol_sda ? + ? + ? () = where: t =t j - t a t j = junction temperature t a = ambient temperature ja = package thermal resistance v ol_event, sda = event and sda output v ol (0.4 v max ) i ol_event, sda = event and sda output i ol (3 ma max ) a0a1 a2 gnd v dd event scl sda ep9 downloaded from: http:/// mcp9843/98243 ds22153c-page 46 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 47 mcp9843/98243 7.0 packaging information 7.1 package marking information 8-lead 2x3x0.9 dfn example : 8-lead tssop example: xxxx xyww nnn 243b e944 256 legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part nu mber cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e 8-lead 2x3x0.75 tdfn example : 8-lead 2x3x0.5 udfn example : xxxyww nn abz944 25 xxxyww nn aag944 25 xxxyww nn aaa944 25 part number code mcp9843-be/mc agk mcp9843t-be/mc agk mcp98243-be/mc abz mcp98243t-be/mc abz part number code mcp9843t-be/mny aak mcp98243t-be/mny aag part number code mcp98243t-be/muy aaa part number code mcp9843-be/st 05ab mcp9843t-be/st 05ab mcp98243-be/st 243b mcp98243t-be/st 243b downloaded from: http:/// mcp9843/98243 ds22153c-page 48 ? 2009 microchip technology inc. !""#$%& ' ! " #$ %! & '(!%&! %( % ")%% % " * & & # "% ( % " + * ) ! % " & "% ,- . /01 / & % # % ! ))%!%% ,21 $ & '! ! )%!%% '$$& % ! ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * 4% 55,, & 5&% 6 67 8 6!&( $ 6 9 % ./0 7 : % 9 % "$$ . 0% %* + ,2 7 5 % /0 7 ;"% , + /0 ,# " "5 % + < .. ,# " ";"% , . < . 0% %;"% ( . + 0% %5 % 5 + . 0% % % ,# " " = < < d n e note 1 1 2 exposed pad note 1 2 1 d2 k l e2 n e b a3 a1 a note 2 bottom view top view ) 0 +0 downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 49 mcp9843/98243 !""#$%& ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * downloaded from: http:/// mcp9843/98243 ds22153c-page 50 ? 2009 microchip technology inc. ()""#$%*& ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 51 mcp9843/98243 ()""#$%*& ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * downloaded from: http:/// mcp9843/98243 ds22153c-page 52 ? 2009 microchip technology inc. + )""#$%+& ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 53 mcp9843/98243 + )""#$%+& ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * downloaded from: http:/// mcp9843/98243 ds22153c-page 54 ? 2009 microchip technology inc. *, -.,/ -." 0 -.*1 1""#$%*..0 & ' ! " #$ %! & '(!%&! %( % ")%% % " & ", "%!" &"$ %! "$ %! % # " .&& " + & "% ,- . /01 / & % # % ! ))%!%% ,21 $ & '! ! )%!%% '$$& % ! ' 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * 4% 55,, & 5&% 6 67 8 6!&( $ 6 9 % >./0 7 : % < < " " * * 9 . % "$$ . < . 7 ;"% , > /0 " " * ;"% , + . " " * 5 % + + 2%5 % 5 . > . 2% % 5 ,2 2% ? < 9? 5 "* < 5 ";"% ( < + d n e e1 note 1 12 b e c a a1 a2 l1 l ) 0 9>/ downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 55 mcp9843/98243 noe: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// mcp9843/98243 ds22153c-page 56 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 57 mcp9843/98243 appendix a: revision history revision c (november 2009) the following is the list of modifications: 1. added the mcp9843 temperature sensor and updated all specification and description sections to include this device. 2. updated table 5-1 and table 5-6 with information on the mcp9843 device. 3. added register 5-8 for mcp9843 device. 4. updated section 7.1 package marking infor- mation . revision b (october 2009) the following is the list of modifications: 1. added mcp98243 vs mcp98242 comparison table. 2. added eeprom write temperature range. 3. changed i 2 c time out minimum specification to 25 ms. 4. replaced figure 2-5 . 5. updated bits 7 and 6 of register 5-2 : capability register. 6. updated device/revision id register. 7. updated functional block diagram ( figure 5-1 ). 8. updated section 5.2.3.1 comparator mode and section 5.2.3.2 interrupt mode . 9. updated figure 5-13 . 10. updated package marking drawings. revision a (may 2009) original release of this document. downloaded from: http:/// mcp9843/98243 ds22153c-page 58 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 59 mcp9843/98243 product identification system to order or obtain information, e.g., on pricing or de livery, refer to the factory or the listed sales office . device: mcp9843: digital temperature sensor mcp9843t: digital temperature sensor (tape and reel) mcp98243: digital temp. sensor + 2k bit eeprom mcp98243t: digital temp. sensor + 2k bit eeprom (tape and reel) grade: b = 1c (max.) from +75c to +95c, b 2c (max.) from +40c to +125c, and b 3c (max.) from -20c to +125c temperature range: e = -40c to +125c package: mc = dual flat no lead (2x3x0.9 mm body), 8-lead, mny * = dual flat no lead (2x3x0.75 mm body, 8-lead (tape and reel) muy * = dual flat no lead (2x3x0.5 mm body, 8-lead (tape and reel) st = plastic thin shrink small outline (4x4 mm body), 8-lead * y = nickel palladium gold manufacturing designator. only available on the tdfn and udfn packages. part no. x /xxx package temperature range device examples: a) mcp9843-be/mc: extended temp., 8ld dfn pkg. b) mcp9843t-be/mc: tape and reel, extended temp., 8ld dfn pkg. c) mcp9843-be/st: extended temp., 8ld tssop pkg. d) mcp9843t-be/st: tape and reel, extended temp., 8ld tssop pkg. e) mcp9843t-be/mny: tape and reel, extended temp., 8ld tdfn (nickel palladium gold) pkg. a) mcp98243-be/mc: extended temp., 8ld dfn pkg. b) mcp98243t-be/mc: tape and reel, extended temp., 8ld dfn pkg. c) mcp98243-be/st: extended temp., 8ld tssop pkg. d) mcp98243t-be/st: tape and reel, extended temp., 8ld tssop pkg. e) mcp98243t-be/mny:tape and reel, extended temp., 8ld tdfn (nickel palladium gold) pkg. f) mcp98243t-be/muy:tape and reel. extended temp., 8ld udfn (nickel palladium gold) pkg. Cx grade downloaded from: http:/// mcp9843/98243 ds22153c-page 60 ? 2009 microchip technology inc. notes: downloaded from: http:/// ? 2009 microchip technology inc. ds22153c-page 61 information contained in this publication regarding device applications and the like is prov ided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application me ets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safe ty applications is entirely at the buyers risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting fr om such use. no licenses are conveyed, implicitly or ot herwise, under any microchip intellectual property rights. trademarks the microchip name and logo, th e microchip logo, dspic, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, rfpic and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mxdev, mxlab, seeval and the embedded control solutions company are register ed trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, application maestro, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mplab certified logo, mplib, mplink, mtouch, octopus, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, pic 32 logo, real ice, rflab, select mode, total endurance, tsharc, uniwindr iver, wiperlock and zena are trademarks of microchip te chnology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2009, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the mo st secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal meth ods used to breach the code protection fe ature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchips c ode protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your softwa re or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the companys quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperi pherals, nonvolatile memory and analog products. in addition, microchips quality system for the design and manufacture of development systems is iso 9001:2000 certified. downloaded from: http:/// ds22153c-page 62 ? 2009 microchip technology inc. americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: http://support.microchip.com web address: www.microchip.com atlanta duluth, ga tel: 678-957-9614 fax: 678-957-1455 boston westborough, ma tel: 774-760-0087 fax: 774-760-0088 chicago itasca, il tel: 630-285-0071 fax: 630-285-0075 cleveland independence, oh tel: 216-447-0464 fax: 216-447-0643 dallas addison, tx tel: 972-818-7423 fax: 972-818-2924 detroit farmington hills, mi tel: 248-538-2250 fax: 248-538-2260 kokomo kokomo, in tel: 765-864-8360 fax: 765-864-8387 los angeles mission viejo, ca tel: 949-462-9523 fax: 949-462-9608 santa clara santa clara, ca tel: 408-961-6444 fax: 408-961-6445 toronto mississauga, ontario, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific asia pacific office suites 3707-14, 37th floor tower 6, the gateway harbour city, kowloon hong kong tel: 852-2401-1200 fax: 852-2401-3431 australia - sydney tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing tel: 86-10-8528-2100 fax: 86-10-8528-2104 china - chengdu tel: 86-28-8665-5511 fax: 86-28-8665-7889 china - hong kong sar tel: 852-2401-1200 fax: 852-2401-3431 china - nanjing tel: 86-25-8473-2460 fax: 86-25-8473-2470 china - qingdao tel: 86-532-8502-7355 fax: 86-532-8502-7205 china - shanghai tel: 86-21-5407-5533 fax: 86-21-5407-5066 china - shenyang tel: 86-24-2334-2829 fax: 86-24-2334-2393 china - shenzhen tel: 86-755-8203-2660 fax: 86-755-8203-1760 china - wuhan tel: 86-27-5980-5300 fax: 86-27-5980-5118 china - xiamen tel: 86-592-2388138 fax: 86-592-2388130 china - xian tel: 86-29-8833-7252 fax: 86-29-8833-7256 china - zhuhai tel: 86-756-3210040 fax: 86-756-3210049 asia/pacific india - bangalore tel: 91-80-3090-4444 fax: 91-80-3090-4080 india - new delhi tel: 91-11-4160-8631 fax: 91-11-4160-8632 india - pune tel: 91-20-2566-1512 fax: 91-20-2566-1513 japan - yokohama tel: 81-45-471- 6166 fax: 81-45-471-6122 korea - daegu tel: 82-53-744-4301 fax: 82-53-744-4302 korea - seoul tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 malaysia - kuala lumpur tel: 60-3-6201-9857 fax: 60-3-6201-9859 malaysia - penang tel: 60-4-227-8870 fax: 60-4-227-4068 philippines - manila tel: 63-2-634-9065 fax: 63-2-634-9069 singapore tel: 65-6334-8870 fax: 65-6334-8850 taiwan - hsin chu tel: 886-3-6578-300 fax: 886-3-6578-370 taiwan - kaohsiung tel: 886-7-536-4818 fax: 886-7-536-4803 taiwan - taipei tel: 886-2-2500-6610 fax: 886-2-2508-0102 thailand - bangkok tel: 66-2-694-1351 fax: 66-2-694-1350 europe austria - wels tel: 43-7242-2244-39 fax: 43-7242-2244-393 denmark - copenhagen tel: 45-4450-2828 fax: 45-4485-2829 france - paris tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany - munich tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy - milan tel: 39-0331-742611 fax: 39-0331-466781 netherlands - drunen tel: 31-416-690399 fax: 31-416-690340 spain - madrid tel: 34-91-708-08-90 fax: 34-91-708-08-91 uk - wokingham tel: 44-118-921-5869 fax: 44-118-921-5820 w orldwide s ales and s ervice 03/26/09 downloaded from: http:/// |
Price & Availability of MCP98243T-BEMNYAA
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |