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see table 2 for pin descriptions. general description the ds1631, ds1631a, and ds1731 digital thermome - ters provide 9, 10, 11, or 12-bit temperature readings over a -55c to +125c range. the ds1631 and ds1631a thermometer accuracy is 0.5c from 0c to +70c with 3.0v v dd 5.5v, and the ds1731 accuracy is 1c from -10c to +85c with 3.0v v dd 5.5v. the ther - mostat on all three devices provides custom hysteresis with user-defined trip points (t h and t l ). the t h and t l registers and thermometer configuration settings are stored in nv eeprom so they can be programmed prior to installation. in addition, the ds1631a automatically begins taking temperature measurements at power-up, which allows it to function as a stand-alone thermostat. pin descriptions for the ds1631/ds1631a/ds1731 are pro - vided in table 2 and user-accessible registers are summa - rized in table 3 . a functional diagram is shown in figure 1 . applications network routers and switches cellular base stations portable products any space-constrained thermally sensitive product beneits and features maximize system accuracy in broad range of thermal management applications ? operating temperature range: -55c to +125c (-67f to +257f) ? ds1631 and ds1631a: 0.5c accuracy over 0c to +70c range ? ds1731: 1c accuracy over a -10c to +85c range ? user-selectable output resolution from 9 bits to 12 bits reduce cost with no external components simplify distributed temperature-sensing applications with multidrop capability ? up to eight devices can operate on a 2-wire bus flexible and nonvolatile user-defined thermostatic modes with custom hysteresis available in 8-pin sop and so (ds1631 and ds1631a only) and the 8-pin dip (ds1631 only) packages ordering information appears at end of data sheet. 19-7488; rev 1; 1/15 pin conigurations 2 sda scl t out gnd v dd a 0 a 1 a 2 ds1631 sop (ds1631u+, ds1631au+, ds1731u+) + 1 4 3 7 8 5 6 top view 2 sda scl t out gnd v dd a 0 a 1 a 2 ds1631 so (150 mil and 208mil) (ds1631z+, ds1631s+) + 1 4 3 7 8 5 6 ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat downloaded from: http:///
voltage on any pin relative to ground ................ -0.5v to +6.0v operating temperature range ......................... -55c to +125c storage temperature range ............................ -55c to +125c solder dip temperature (10s) ....... see ipc/jedec j-std-020a specification reflow oven temperature ............................................... +220c (v dd = 2.7v to 5.5v; t a = -55c to +125c.) parameter symbol condition min max units supply voltage v dd (note 1) 2.7 5.5 v ds1631, ds1631a thermometer error (note 2) t err 0c to +70c, 3.0v v dd 5.5v 0.5 c 0c to +70c,2.7v v dd < 3.0v 1 -55c to +125c 2 ds1731 thermometer error (note 2) t err -10c to +85c, 3.0v v dd 5.5v 1 c -10c to +85c, 2.7v v dd < 3.0v 1.5 -55c to +125c 2 low-level input voltage v il -0.5 0.3 x v dd v high-level input voltage v ih 0.7 x v dd v dd + 0.3 v sda low-level output voltage v ol1 3ma sink current 0 0.4 v v ol2 6ma sink current 0 0.6 input current each i/o pin 0.4 < v i/o < 0.9v dd -10 +10 a active supply current (note 3) i dd temperature conversion -55c to +85c 1 ma temperature conversion +85c to +125c 1.25 e 2 write 400 a communication only 110 standby supply current i stby 0c to +70c (note 4) 800 na t out output logic voltage v oh 1ma source current (note 1) 2.4 v v ol 4ma sink current (note 1) 0.4 v ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 2 absolute maximum ratings * these are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. dc electrical characteristics downloaded from: http:///
(v dd = 2.7v to 5.5v; t a = -55c to +125c.) note 1: all voltages are referenced to gnd. note 2: see figure 2 for typical operating curves. note 3: specified with t out pin open; a 0 , a 1 , a 2 = 0v or v dd ; and f scl 2hz. note 4: specified with temperature conversions stopped; t out pin open; sda = v dd ; scl = v dd ; and a 0 , a 1 , a 2 = 0v or v dd . note 5: see timing diagram in figure 3 . all timing is referenced to 0.9 x v dd and 0.1 x v dd . note 6: after this period the first clock pulse is generated. note 7: for example, if c b = 300pf, then t r [min] = t f [min] = 50ns. (v dd = 2.7v to 5.5v; t a = -55c to +125c.) parameter symbol condition min typ max units temperature conversion time t tc 9-bit resolution 93.75 ms 10-bit resolution 187.5 11-bit resolution 375 12-bit resolution 750 scl frequency f scl 0 400 khz bus free time between a stop and start condition t buf (note 5) 1.3 s start and repeated start hold time from falling scl t hd:sta (note 5, 6) 0.6 s low period of scl t low (note 5) 1.3 s high period of scl t high (note 5) 0.6 s repeated start condition setup time to rising scl t su:sta (note 5) 0.6 s data-out hold time from falling scl t hd:dat (note 5) 0 0.9 s data-in setup time to rising scl t su:dat (note 5) 100 ns rise time of sda and scl t r (note 5, 7) 20 + 0.1c b 1000 ns fall time of sda and scl t f (note 5, 7) 20 + 0.1c b 300 ns stop setup time to rising scl t su:sto (note 5) 0.6 s capacitive load for each bus line c b 400 pf i/o capacitance c i/o 10 pf input capacitance c i 5 pf spike pulse width that can be suppressed by input filter t sp 0 50 ns parameter symbol condition min typ max units eeprom write cycle time t wr 4 10 ms eeprom writes n eewr -55c to +55c 50k writes eeprom data retention t eedr -55c to +55c 10 years ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 3 ac electrical characteristics eeprom ac electrical characteristics downloaded from: http:///
pin symbol description 1 sda data input/output pin for 2-wire serial communication port. open-drain. 2 scl clock input pin for 2-wire serial communication port. 3 t out thermostat output pin. push-pull. 4 gnd ground pin 5 a 2 address input pin 6 a 1 address input pin 7 a 0 address input pin 8 v dd supply voltage pin. +2.7v to +5.5v power-supply pin. figure 1. functional diagram figure 2. typical operating curves address and i/o control v dd scl sda a 0 a 1 a 2 gnd configuration register and control logic temperature sensor and ? adc temperature register t h register t l register digital comparator/logic t out ds1631 error (c) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 10 20 30 40 50 60 70 reference temperature (c) ds1631/ds1631a +3 mean -3 error (c) 0.8 -10 reference temperature (c) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 10 20 30 40 50 60 70 80 ds1731 +3 mean -3 ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 4 table 2. detailed pin description downloaded from: http:///
table 3. register summary register name (user access) size (bytes) memory type register contents and power-up state temperature (read only) 2 sram measured temperature in twos complement format. power-up state: -60oc (1100 0100 0000 0000) t h (read/write) 2 eeprom upper alarm trip point in twos complement format. factory state: 15oc (0000 1111 0000 0000) t l (read/write) 2 eeprom lower alarm trip point in twos complement format. factory state: 10oc (0000 1010 0000 0000) coniguration (various bits are read/ write and read onlysee table 5) 1 sram, eeprom coniguration and status information. unsigned data.6 msbs = sram 2 lsbs (pol and 1shot bits) = eeprom power-up state: 100011xx (xx = user deined) figure 3. timing diagram all timing is referenced to 0.9 x v dd and 0.1 x v dd . sda stop scl start repeated start t buf t low t r t hd:sta t f t hd:sta t sp t hd:dat t high t su:dat t su:sta t su:sto ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 5 downloaded from: http:///
operationmeasuring temperature the ds1631, ds1631a, and ds1731 measure tempera - ture using bandgap-based temperature sensors. a delta- sigma analog-to-digital converter (adc) converts the measured temperature to a 9-, 10-, 11-, or 12-bit (user- selectable) digital value that is calibrated in c; for f applications a lookup table or conversion routine must be used. throughout this data sheet, the term conversion is used to refer to the entire temperature measurement and adc sequence. the ds1631 and ds1731 always power-up in a low-pow - er idle state, and the start convert t command must be used to initiate conversions. the ds1631a begins conver - sions automatically at power-up in the mode determined by the configuration registers 1shot bit. the ds1631, ds1631a, and ds1731 can be programmed to perform continuous consecutive conversions (continu - ous-conversion mode) or to perform single conversions on command (one-shot mode). the conversion mode is programmed through the 1shot bit in the configuration register as explained in the configuration register sec - tion of this data sheet. in continuous-conversion mode, the ds1631a begins performing continuous conversions immediately at power-up, and the ds1631 and ds1731 begin continuous conversions after a start convert t command is issued. for all three devices, consecu - tive conversions continue to be performed until a stop convert t command is issued, at which time the device goes into a low-power idle state. continuous conversions can be restarted at any time using the start convert t command. in one-shot mode the ds1631a performs a single con - version at power-up, and the ds1631 and ds1731 perform a single temperature conversion when a start convert t command is issued. for all three devices, when the conversion is complete the device enters a low-power idle state and remains in that state until a single temperature conversion is again initiated by a start convert t command. the resolution of the output digital temperature data is user-configurable to 9, 10, 11, or 12 bits, corresponding to temperature increments of 0.5c, 0.25c, 0.125c, and 0.0625c, respectively. the default resolution at power- up is 12 bits, and it can be changed through the r0 and r1 bits in the configuration register. note that the conver - sion time doubles for each additional bit of resolution. after each conversion, the digital temperature is stored as a 16-bit twos complement number in the two-byte temperature register as shown in figure 4 . the sign bit (s) indicates if the temperature is positive or negative: for positive numbers s = 0 and for negative numbers s = 1. the read temperature command provides user access to the temperature register. bits 3 through 0 of the temperature register are hardwired to 0. when the device is configured for 12-bit resolution, the 12 msbs (bits 15 through 4) of the temperature register contain temperature data. for 11 bit resolution, the 11 msbs (bits 15 through 5) of the temperature register contain data, and bit 4 is 0. likewise, for 10-bit resolution, the 10 msbs (bits 15 through 6) contain data, and for 9-bit the 9 msbs (bits 15 through 7) contain data, and all unused lsbs con - tain 0s. table 4 gives examples of 12-bit resolution output data and the corresponding temperatures. table 4. 12-bit resolution temperature/ data relationship temperature (c) digital output (binary) digital output (hex) +125 0111 1101 0000 0000 7d00h +25.0625 0001 1001 0001 0000 1910h +10.125 0000 1010 0010 0000 0a20h +0.5 0000 0000 1000 0000 0080h 0 0000 0000 0000 0000 0000h -0.5 1111 1111 1000 0000 ff80h -10.125 1111 0101 1110 0000 f5e0h -25.0625 1110 0110 1111 0000 e6f0h -55 1100 1001 0000 0000 c900h figure 4. temperature, t h , and t l register format bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 ms byte s 2 6 2 5 2 4 2 3 2 2 2 1 2 0 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 ls byte 2 -1 2 -2 2 -3 2 -4 0 0 0 0 ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 6 downloaded from: http:///
operationthermostat function the thermostat output (t out ) is updated after every temperature conversion, based on a comparison between the measured digital temperature and user-defined upper and lower thermostat trip points. t out remains at the updated value until the next conversion completes. when the measured temperature meets or exceeds the value stored in the upper trip-point register (t h ), t out becomes active and remains active until the measured temperature falls below the value stored in the lower trip-point register (t l ) (see figure 5 ). this allows the user to program any amount of hysteresis into the output response. the active state of t out is user-programmable through the polarity bit (pol) in the configuration register. the user-defined values in the t h and t l registers (see figure 4) must be in twos complement format with the msb (bit 15) containing the sign bit (s). the t h and t l resolution is determined by the r0 and r1 bits in the configuration register (see table 6 ), so the t h and t l resolution matches the output temperature resolution. for example, for 10-bit resolution bits 5 through 0 of the t h and t l registers read out as 0 (even if 1s are written to these bits), and the converted temperature is compared to the 10 msbs of t h and t l . the t h and t l registers are stored in eeprom; there - fore, they are nv and can be programmed prior to device installation. writing to and reading from the t h and t l registers is achieved using the access t h and access t l commands. when making changes to the t h and t l registers, conversions should first be stopped using the stop convert t command if the device is in continuous conversion mode. note that if the thermostat function is not used, the t h and t l registers can be used as general- purpose nv memory. another thermostat feature is the temperature high and low flags (thf and tlf) in the configuration register. these bits provide a record of whether the temperature has been greater than t h or less than t l at anytime since the device was powered up. these bits power up as 0s, and if the temperature ever exceeds the t h register value, the thf bit is set to 1, or if the temperature ever falls below the t l value, the tlf bit is set to 1. once thf and/ or tlf has been set, it remains set until overwritten with a 0 by the user or until the power is cycled. ds1631a stand-alone thermostat operation since the ds1631a automatically begins taking tem - perature measurements at power-up, it can function as a standalone thermostat (i.e., it can provide thermostatic operation without microcontroller communication). for standalone operation, the nv t h and t l registers and the pol and 1shot bits in the configuration register should be programmed to the desired values prior to installation. since the default conversion resolution at power-up is 12 bits (r1 = 1 and r0 = 1 in the configuration register), the conversion resolution is always 12 bits during standalone thermostat operation. coniguration register the configuration register allows the user to program various ds1631 options such as conversion resolution, tout polarity, and operating mode. it also provides infor - mation to the user about conversion status, eeprom activity, and thermostat activity. the configuration register is arranged as shown in figure 6 and detailed descrip - tions of each bit are provided in table 5 . this register can be read from and written to using the access config command. when writing to the configuration register, con - versions should first be stopped using the stop convert t command if the device is in continuous conversion mode. note that the pol and 1shot bits are stored in eeprom so they can be programmed prior to installation is desired. all other configuration register bits are sram and power up in the state shown in table 5 . figure 5. thermostat output operation figure 6. configuration register t l temp t out pol = 1 (t out is active high) t h logic 1 logic 0 msb bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 lsb done thf tlf nvb r1 r0 pol* 1shot* *nv (eeprom) ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 7 downloaded from: http:///
table 5. configuration register bit descriptions table 6. resolution configuration *stored in eeprom bit name (user access) functional description donetemperature conversion done (read only) power-up state = 1. done = 0. temperature conversion is in progress. done = 1. temperature conversion is complete. thftemperature high flag (read/write) power-up state = 0. thf = 0. the measured temperature has not exceeded the value stored in the t h register since power-up. thf = 1. at some point since power-up the measured temperature has been higher than the value stored in the t h register. thf remains a 1 until it is overwritten with a 0 by the user, the power is cycled, or a software por command is issued. tlftemperature low flag (read/write) power-up state = 0. tlf = 0. the measured temperature has not been lower than the value stored in the t l register since power-up. tlf = 1. at some point since power-up the measured temperature has been lower than the value stored in the t l register. tlf remains a 1 until it is overwritten with a 0 by the user, the power is cycled, or a software por command is issued. nvbnv memory busy (read only) power-up state = 0. nvb = 1. a write to eeprom memory is in progress. nvb = 0. nv memory is not busy. r1resolution bit 1 (read/write) power-up state = 1. sets conversion, t h , and t l resolution (see table 6). r0resolution bit 0 (read/write) power-up state = 1. sets conversion, t h , and t l resolution (see table 6). pol*t out polarity (read/write) power-up state = last value written to this bit. factory setting = 0. pol = 1. t out is active high. pol = 0. t out is active low. 1shot*conversion mode (read/write) power-up state = last value written to this bit. factory setting = 0. 1shot = 1. one-shot mode. the start convert t command initiates a single temperature conversion and then the device goes into a low-power standby state. 1shot = 0. continuous conversion mode. the start convert t command initiates continuous temperature conversions. r1 r0 resolution (bit) conversion time (max) 0 0 9 93.75ms 0 1 10 187.5ms 1 0 11 375ms 1 1 12 750ms ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 8 downloaded from: http:///
2-wire serial data bus the ds1631, ds1631a, and ds1731 communicate over a bidirectional 2-wire serial data bus that consists of a serial clock (scl) signal and serial data (sda) signal. the ds1631, ds1631a, and ds1731 interface to the bus through their scl input pins and open-drain sda i/o pins. the following terminology is used to describe 2-wire com - munication: master device: microprocessor/microcontroller that con - trols the slave devices on the bus. the master device gen - erates the scl signal and start and stop conditions. slave: all devices on the bus other than the master. the ds1631, ds1631a, and ds1731 always function as slaves. bus idle or not busy: both sda and scl remain high. sda is held high by a pullup resistor when the bus is idle, and scl must either be forced high by the master (if the scl output is push-pull) or pulled high by a pullup resistor (if the scl output is open-drain). transmitter: a device (master or slave) that is sending data on the bus. receiver: a device (master or slave) that is receiving data from the bus. start condition: signal generated by the master to indicate the beginning of a data transfer on the bus. the master generates a start condition by pulling sda from high to low while scl is high (see figure 8 ). a repeated start is sometimes used at the end of a data transfer (instead of a stop) to indicate that the master will per - form another operation. stop condition: signal generated by the master to indicate the end of a data transfer on the bus. the master generates a stop condition by transitioning sda from low to high while scl is high (see figure 8 ). after the stop is issued, the master releases the bus to its idle state. acknowledge (ack): when a device is acting as a receiver, it must generate an acknowledge (ack) on the sda line after receiving every byte of data. the receiv - ing device performs an ack by pulling the sda line low for an entire scl period (see figure 8 ). during the ack clock cycle, the transmitting device must release sda. a variation on the ack signal is the not acknowledge (nack). when the master device is acting as a receiver, it uses a nack instead of an ack after the last data byte to indicate that it is finished receiving data. the master indicates a nack by leaving the sda line high during the ack clock cycle. slave address: every slave device on the bus has a unique 7-bit address that allows the master to access that device. the 7-bit bus address is 1 0 0 1 a 2 a 1 a 0 , where a 2 , a 1 , and a 0 are user-selectable through the corresponding input pins. the three address pins allow up to eight ds1631s, ds1631as, or ds1731s to be mul - tidropped on the same bus. control byte: the control byte is transmitted by the mas - ter and consists of the 7-bit slave address plus a read/write (r/ w ) bit (see figure 7 ). if the master is going to read data from the slave device then r/ w = 1, and if the master is going to write data to the slave device then r/ w = 0. command byte: the command byte can be any of the command protocols described in the command set sec- tion of this data sheet.figure 7. control byte figure 8. start, stop, and ack signals bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 0 0 1 a 2 a 1 a 0 r/ w sda scl start conditions ack (or nack) from receiver stop condition ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 9 downloaded from: http:///
general 2-wire information all data is transmitted msb irst over the 2-wire bus. one bit of data is transmitted on the 2-wire bus each scl period. a pullup resistor is required on the sda line and, when the bus is idle, both sda and scl must remain in a logic-high state. all bus communication must be initiated with a start condition and terminated with a stop condition. dur - ing a start or stop is the only time sda is allowed to change states while scl is high. at all other times, changes on the sda line can only occur when scl is low: sda must remain stable when scl is high. after every 8-bit (1-byte) transfer, the receiving device must answer with an ack (or nack), which takes one scl period. therefore, nine clocks are required for every one-byte data transfer. initiating 2-wire communication to initiate 2-wire communication, the master generates a start followed by a control byte containing the ds1631, ds1631a, or ds1731 slave address. the r/ w bit of the control byte must be a 0 (write) since the master next writes a command byte. the ds1631/ds1631a/ds1731 responds with an ack after receiving the control byte. this must be followed by a command byte from the mas - ter, which indicates what type of operation is to be per - formed. the ds1631/ds1631a/ds1731 again respond with an ack after receiving the command byte. if the command byte is a start convert t or stop convert t command (see figure 9 ), the transaction is finished, and the master must issue a stop to signal the end of the communication sequence. if the command byte indi - cates a write or read operation, additional actions must occur as explained in the following sections. 2-wire writes the master can write data to the ds1631/ds1631a/ ds1731 by issuing an access config, access t h , or access t l command following the control byte (see figures 9b and 9d). since the r/ w bit in the control byte was a 0 (write), the ds1631/ds1631a/ds1731 are already prepared to receive data. therefore, after receiv - ing an ack in response to the command byte, the master device can immediately begin transmitting data. when writing to the configuration register, the master must send one byte of data, and when writing to the t h or t l registers the master must send two bytes of data. after receiving each data byte, the ds1631/ds1631a/ds1731 respond with an ack, and the transaction is finished with a stop from the master. 2-wire reads the master can read data from the ds1631/ds1631a/ ds1731 by issuing an access config, access th, access tl, or read temperature command following the control byte (see figures 9c and 9e). after receiving an ack in response to the command, the master must generate a repeated start followed by a control byte with the same slave address as the first control byte. however, this time the r/ w bit must be a 1, which tells the ds1631/ ds1631a/ds1731 that a read is being performed. after the ds1631/ds1631a/ds1731 send an ack in response to this control byte, it begins transmitting the requested data on the next clock cycle. one byte of data will be trans - mitted when reading from the configuration register after which the master must respond with a nack followed by a stop. for two-byte reads (i.e., from the temperature, t h , or t l register), the master must respond to the first data byte with an ack and to the second byte with a nack fol - lowed by a stop. if only the most significant byte of data is needed, the master can issue a nack followed by a stop after reading the first data byte. command set the ds1631/ds1631a/ds1731 command set is detailed below: start convert t [ 51h ] initiates temperature conversions. if the part is in one-shot mode (1shot = 1), only one conversion is performed. in continuous mode (1shot = 0), continuous temperature conversions are performed until a stop convert t com - mand is issued. stop convert t [ 22h ] stops temperature conversions when the device is in continuous conversion mode (1shot = 0). read temperature [ aah ] reads last converted temperature value from the 2-byte temperature register. access th [ a1h ] reads or writes the 2-byte t h register. access tl [ a2h ] reads or writes the 2-byte t l register. access config [ ach ] reads or writes the 1-byte configuration register. software por [ 54h ] initiates a software power-on-reset (por), which stops temperature conversions and resets all registers and logic to their power-up states. the software por allows the user to simulate cycling the power without actually powering down the device. ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 10 downloaded from: http:///
figure 9. (a, b, c, d, e). 2-wire interface timing a d2 d6 d5 d4 d3 d1 d0 a0 w a a1 1 0 1 0 1 1 0 0 a d7 a2 s 1 1 0 0 p a) issue a "start convert t or stop convert t command scl sda s 1 0 0 1 a2 a1 a0 w a c7 c6 c5 c4 c3 c2 c1 c0 a p stop ack (therm) command byte ack (therm) control byte start b) write to the configuration register scl sda ack (therm) command byte ack (therm) control byte start data byte (from master) stop ack (therm) c) read from the configuration register scl sda s 1 0 0 a0 w a a1 1 0 1 0 1 1 0 0 a a2 1 s 1 0 0 1 a2 a1 a0 r a d7 d6 d5 d4 d3 d2 d1 d0 n p ack (therm) command byte ack (therm) control byte start repeat start control byte ack (therm) data byte (from therm) nack (master) stop scl sda s 1 0 0 a0 w a a1 a2 1 d) write to the t h or t l register c7 c6 c5 c4 c3 c2 c1 c0 a d7 d6 d5 d4 d3 d2 d1 d0 a d7 d6 d5 d4 d3 d2 d1 d0 a p command byte ack (therm) control byte start ack (therm) ms data byte (from master) ack (therm) ls data byte (from master) ack (therm) stop e) read from the temperature , t h , or t l register scl sda s 1 0 0 1 a2 a1 a0 w a c7 c6 c5 c4 c3 c2 c1 c0 a s 1 0 0 1 a2 a1 a0 r a d7 d6 d5 d4 d3 d2 d1 d0 a ack (therm) command byte ack (therm) control byte start repeat start control byte ack (therm) ms data byte (from therm) ack (master) d5 n d6 d4 d3 d2 d1 d0 p d7 ls data byte (from therm) nack (master) stop therm = ds1631, ds1631a, or ds1731 ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 11 downloaded from: http:///
operation example in this example, the master configures the ds1631/ds1631a/ds1731 (a 1 a 2 a 3 = 000) for continuous conversions and thermostatic function.* thermometer = ds1631, ds1631a, or ds1731 master mode thermeter* mode data (msb first ) comments tx rx start start condition from master. tx rx 90h master sends control byte with r/ w = 0. rx tx ack acknowledge bit from thermometer. tx rx ach master sends access conig command. rx tx ack acknowledge bit from thermometer. tx rx 02h master writes a data byte to the coniguration register to put the thermometer in continuous conversion mode and set the t out polarity to active high. rx tx ack acknowledge bit from thermometer. tx rx stop stop condition from master. tx rx start start condition from master. tx rx 90h master sends control byte with r/ w = 0. rx tx ack acknowledge bit from thermometer. tx rx a1h master sends access th command. rx tx ack acknowledge bit from thermometer. tx rx 28h master sends most signiicant data byte for t h = +40c. rx tx ack acknowledge bit from thermometer. tx rx 00h master sends least signiicant data byte for t h = +40c. rx tx ack acknowledge bit from thermometer. tx rx stop stop condition from master. tx rx start start condition from master. tx rx 90h master sends control byte with r/ w = 0. rx tx ack acknowledge bit from thermometer. tx rx a2h master sends access tl command. rx tx ack acknowledge bit from thermometer. tx rx 0ah master sends most signiicant data byte for t l = +10c. rx tx ack acknowledge bit from thermometer. tx rx 00h master sends least signiicant data byte for t l = +10c. rx tx ack acknowledge bit from thermometer. tx rx stop stop condition from master. tx rx start start condition from master. tx rx 90h master sends control byte with r/ w = 0. rx tx ack acknowledge bit from thermometer. tx rx 51h master sends start convert t command. rx tx ack acknowledge bit from thermometer. tx rx stop stop condition from master. ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 12 downloaded from: http:///
note: a + symbol will also be marked on the package near the pin 1 indicator. ordering number package marking description ds1631u+ d1631 (see note) ds1631 in lead-free 8-pin sop ds1631u+t&r d1631 (see note) ds1631 in lead-free 8-pin sop, 3000 piece tape-and-reel ds1631z+ ds1631z (see note) ds1631 in lead-free 150 mil 8-pin so ds1631z+t&r ds1631z (see note) ds1631 in lead-free 150 mil 8-pin so, 2500 piece tape-and-reel ds1631au+ 1631a (see note) ds1631a in lead-free 8-pin sop ds1631au+t&r 1631a (see note) ds1631a in lead-free 8-pin sop, 3000 piece tape-and-reel ds1631s+ ds1631s (see note) ds1631 in lead-free 208 mil 8-pin so ds1631s+t&r ds1631s (see note) ds1631 in lead-free 208 mil 8-pin so, 2000 piece tape-and-reel ds1631+ ds1631 (see note) ds1631 in lead-free 300 mil 8-pin dip ds1731u+ d1731 (see note) ds1731 in lead-free 8-pin sop ds1731u+t&r d1731 (see note) ds1731 in lead-free 8-pin sop, 3000 piece tape-and-reel ds1631u d1631 ds1631 in 8-pin sop ds1631u/t&r d1631 ds1631 in 8-pin sop, 3000-piece tape-and-reel ds1631z ds1631z ds1631 in 150mil 8-pin so ds1631z/t&r ds1631z ds1631 in 150mil 8-pin so, 2500-piece tape-and-reel ds1631au 1631a ds1631a in 8-pin sop ds1631au/t&r 1631a ds1631a in 8-pin sop, 3000-piece tape-and-reel ds1631s ds1631s ds1631 in 208 mil 8-pin so ds1631s/t&r ds1631s ds1631 in lead-free 208 mil 8-pin so, 2000 piece tape-and-reel ds1631 ds1631 ds1631 in 300 mil 8-pin dip ds1731u d1731 ds1731 in 8-pin sop ds1731u/t&r d1731 ds1731 in 8-pin sop, 3000-piece tape-and-reel ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat www.maximintegrated.com maxim integrated 13 table 1. ordering information downloaded from: http:///
revision number revision date description pages changed 0 10/07 initial release 1 1/15 updated beneits and features section 1 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2015 maxim integrated products, inc. 14 ds1631/ds1631a/ds1731 high-precision digital thermometer and thermostat revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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