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july 2010 doc id 16483 rev 5 1/36 1 stts751 2.25 v low-voltage local digital temperature sensor features operating voltage 2.25 v to 3.6 v operating temperature ?40 c to +125 c programmable ? 10 different conversion rates 0.0625 to 32 conversions/sec. 1 conversion/sec. - default ? 4 different resolutions 9-bit (0.5 c/lsb) to12-bit (0.0625 c/lsb) 10-bit (0.25 c/lsb) - default low supply current ? 50 a (typ) for 8 conversions/sec. ? 20 a (typ) for 1 conversion/sec. ? 3 a (typ) standby accuracy ? 1.0 c (typ) 0 c to +85 c ? 2.0 c (typ) ?40 c to +125 c one-shot mode for power saving fast conversion time 21 ms (typ) 10-bit pull-up resistor value allo ws single pin to select one of four slave addresses supports 400 khz serial clock smbus 2.0 compatible ? smbus alert (ara) support ? smbus timeout rohs/green applications solid state drives portable electronics notebook computers smart batteries servers telecom udfn-6l sot23-6l table 1. device summary order code pull-up resistor value smbus address comments stts751-0dp3f stts751-0wb3f 7.5 k 5% 1001 000 b address selection via resistor pull-up on addr/therm pin 12 k 5% 1001 001 b 20 k 5% 0111 000 b 33 k 5% 0111 001 b STTS751-1DP3F stts751-1wb3f 7.5 k 5% 1001 010 b address selection via resistor pull-up on addr/therm pin 12 k 5% 1001 011 b 20 k 5% 0111 010 b 33 k 5% 0111 011 b www.st.com
contents stts751 2/36 doc id 16483 rev 5 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 smbus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 smbus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 write byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 read byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 send byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.5 receive byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.6 smbus addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.7 smbus timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.8 alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 stts751 register summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 stts751 register formats and details . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 temperature register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 temperature limit register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 temperature examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.5 status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.6 configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7 conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.8 one-shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.9 therm limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.10 therm hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.11 smbus timeout register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.12 stts751 product id . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.13 stts751 manufacturer?s id . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.14 stts751 revision id . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 event output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
stts751 contents doc id 16483 rev 5 3/36 6 addr/therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 8 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 9 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 10 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
list of tables stts751 4/36 doc id 16483 rev 5 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 4. smbus write byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 5. smbus read byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 6. smbus send byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 7. smbus receive byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 table 8. smbus protocol response to ara . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 9. registers/pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 10. pointer register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 11. temperature register (two?s complement) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 12. temperature limit register (two?s complement format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 13. temperature examples (two?s complement format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 14. status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 15. configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 16. conversion resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 17. conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 18. conversion rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 19. one-shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 20. therm limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 21. therm hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 22. smbus timeout register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 23. product id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 24. manufacturer?s id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 25. revision id register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 26. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 27. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 28. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 29. ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 30. udfn-6l (2 mm x 2 mm x 0.5 mm) package mechanical data . . . . . . . . . . . . . . . . . . . . . 29 table 31. sot23-6l (2.90 mm x 2.80 mm) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . 30 table 32. carrier tape dimensions for udfn-6l and sot23-6l packages . . . . . . . . . . . . . . . . . . . . 32 table 33. reel dimensions for 8 mm carrier tape - udfn-6l and sot23-6l packages . . . . . . . . . . 33 table 34. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 35. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
stts751 list of figures doc id 16483 rev 5 5/36 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. pinout - sot23-6l and udfn-6l. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 4. application hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 5. smbus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 6. event output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 7. therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 figure 8. ac measurement i/o waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5 figure 9. udfn-6l (2 mm x 2 mm x 0.5 mm) package mechanical drawing . . . . . . . . . . . . . . . . . . 29 figure 10. sot23-6l (2.90 mm x 2.80 mm) package mechanical drawing. . . . . . . . . . . . . . . . . . . . . 30 figure 11. udfn-6l package footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 figure 12. sot23-6l package footprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 figure 13. carrier tape for udfn-6l and sot23-6l packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 figure 14. reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
description stts751 6/36 doc id 16483 rev 5 1 description the stts751 is a digital temperature sensor which communicates over a 2-wire smbus 2.0 compatible bus. the temperature is measured with a user-configurable resolution between 9 and 12 bits. at 9 bits, the smallest step size is 0.5 c, and at 12 bits, it is 0.0625 c. at the default resolution (10 bits, 0.25 c/lsb), the conversion time is no minally 21 milliseconds. the open-drain event output is used to indicate an alarm condition in which the measured temperature has exceeded the user-programmed high limit or fallen below the low limit. when the event pin is asserted, the host can respond using the smbus alert response address (ara) protocol to which the stts7 51 will respond by sending its slave address. the stts751 is a 6-pin device that supports user-configurable slave addresses. via the pull-up resistor on the addr/therm pin, one of four different slave addresses can be specified. two order numbers (stts751-0 and stts751-1) provide two different sets of slave addresses bringing the total available to eight. thus, up to eight devices can share the same 2-wire smbus without ambiguity, thereby allowing monitoring of multiple temperature zones in an application. the two-wire interface can support transfer rates up to 400 khz. two small footprint packages are available: a udfn-6l and a standard sot23-6l package. figure 1. logic diagram 1. this pin may not float. table 2. signal names symbol type description addr/therm output address selection pin / thermal status pin event output event (alert) output sda i/o smbus interface data i/o scl input smbus interface clock input v dd power device power supply gnd ground device ground sda v dd stts751-0 gnd scl event (1) addr/therm stts751-1 am03028v1
stts751 description doc id 16483 rev 5 7/36 figure 2. pinout - sot23-6l and udfn-6l sda v dd gnd scl event addr/therm 1 2 3 6 5 4 sda v dd gnd scl 1 2 3 6 5 4 event addr/therm sot23-6l udfn-6l am03029v1 table 3. pin descriptions pin name description sot23-6l udfn-6l 14 addr/therm open-drain output that can be used to turn on/off a fan or throttle a cpu clock in the event of an overtemperature condition. the pin at power-up determines the smbus slave address according to the pull-up resistor value as shown in ta bl e 1 . this pin must have a pull-up resistor connected to the same voltage as v dd or tied to gnd (pin cannot float). total capacitance on this pin must be <100 pf. note: by tying addr/therm to ground, the device functions as one address device only. the therm functionality is then not available. the address for device stts751-0 is 72h and the address for device stts751-1 is 76h. 25gndgnd 33v dd power supply v dd 4 1 scl smbus clock 5 2 event open-drain interrupt output. output supports the smbus alert (ara). note: this pin may not float. 6 6 sda smbus data input/output
description stts751 8/36 doc id 16483 rev 5 figure 3. block diagram figure 4. application hardware hookup interrupt enabling smbus interface control logic sensor a to d converter digital comparator alert response temperature registers configuration conversion rate high limit registers low limit registers one-shot therm limit therm hysteresis smbus timeout product id manufacturer id address pointers registers scl sda v dd event status addr/therm revision id am03030v1 v dd gnd f a n driver ho s t controller s cl s da s tt s 751-0 s tt s 751-1 addr/therm event v dd r am0 3 0 3 1v1 gnd
stts751 functional description doc id 16483 rev 5 9/36 2 functional description the stts751 digital temperature sensor acquires the temperature and stores it in the temperature register. the resolution is programmable which allows the host controller to select the optimal configuration between sensitivity and conversion times. the stts751 can be placed in standby mode to minimize power consumption. the user can control the update rate of the temperature measurements via the configuration register ( table 15 on page 17 ). sample rates can be adjusted from once every 16 seconds up to 32 sample s per second, in powers-of-2 steps. these devices also offer a one-shot feature. when the device is in the standby mode, writing to the one-shot register initiates a single temperature conversion. the result is compared with the limit registers, and the outputs updated accordingly. then the device returns to the standby mode. operating the device in this mode allows for very low average power consumption, thereby making this device ideal for low power applications. the device supports the smbus alert response address (ara) protocol. the ara is polled by the controller (host) device that supports this protocol whenever it detects that the event pin has been asserted. the stts751 will re spond with its device address (refer to section 3.8 on page 12 ). the stts751 contains 16 registers. the register summary is shown in table 9 on page 13 . using register addresses not specified in the table may result in an incorrect response. these registers and their functions are described in more detail in the following sections.
smbus interface stts751 10/36 doc id 16483 rev 5 3 smbus interface 3.1 smbus protocol the stts751 communicates over a 2-wire serial interface compatible with the smbus standard. temperature data, alarm limits and configuration information are communicated over the bus. a detailed timing diagram is shown below in figure 5 . figure 5. smbus timing diagram the stts751 supports standard smbus protocols (see ta b l e 4 , 5 , 6 , and 7 ). write byte read byte send byte receive byte alert response address ps p s - start condition p - stop condition t buf t hd; sta t low t r t high t hd; sta t f t su:sto t su:sta t su:dat t hd:dat s smclk smdata am03067v1
stts751 smbus interface doc id 16483 rev 5 11/36 3.2 write byte the write byte protocol is used to write one byte of data to the registers as shown in ta bl e 4 . the gray data is sent by the stts751 while the white data is sent by the host. 3.3 read byte the read byte protocol is used to read one byte of data from the registers as shown in ta bl e 5 . 3.4 send byte the send byte protocol is used to set the inter nal address register to the correct address. it sends a register address with no data (see ta bl e 6 ). the send byte can be followed by the receive byte protocol described below in order to read data from the register. 3.5 receive byte the receive byte protocol is used to read data from the register when the internal register address pointer is known (see ta bl e 7 ). this can be used for consecutive reads of the same register. table 4. smbus write byte protocol start slave address wr ack register address ack data ack stop 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 8 bits 1 bit 1 bit table 5. smbus read byte protocol start slave address wr ack register address ack start slave address rd ack data nack stop 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 1 bit table 6. smbus send byte protocol start slave address wr ack register address ack stop 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 1 bit table 7. smbus receive byte protocol start slave address rd ack data nack stop 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 1 bit
smbus interface stts751 12/36 doc id 16483 rev 5 3.6 smbus addresses the stts751 is available in two versions. each version has 4 slave addresses determined by the pull-up resistor value connected to the addr/therm pin. refer to ta b l e 1 for valid address and recommended resist or values. the device will not respond to an invalid slave address. 3.7 smbus timeout the stts751 supports smbus timeout which is enabled by default at power-up. this can be disabled via bit 7 in the timeout register, refer to section 4.11: smbus timeout register . when timeout is enabled, the stts751 will time out after 25 to 35 ms of inactivity. the stts751 supports the smbus timeout feature. if the host holds scl low or the device drives sda low for more than t timeout (max), the stts751 resets and releases the bus. this feature is turned on by default. the stts751 also supports timeout while in standby mode and when the device is driving sda low. note: the stts751 never drives the clock line and it does not support clock stretching. 3.8 alert response address the stts751supports the smbus alert response address (ara) protocol. in the event of an out-of-limit temperat ure measurement, the event output will be asserted. in response, the host (supporting the ara protocol) will send th e smbus alert response address to the general (slave) address of 0001_100b. all de vices with active interr upts will respond with their client addresses as shown in table1 on page1 (with the lsb bit set to 0). the stts751 will acknowledge the ara and re spond with its slave device address. ta bl e 8 shows the ara transfer. see section 5 for more information. table 8. smbus protocol response to ara field start alert response address rd ack stts751 slave address nack stop bits 171 1 81 1
stts751 stts751 register summary doc id 16483 rev 5 13/36 4 stts751 register summary the stts751 uses 8-bit registers. variables longer than 8 bits are managed in byte pairs. for example, when reading a 10-bit temperature value (10 bits is the default resolution.) the application must read two registers and then concatenate the upper byte with the 2 most significant bits of the lower byte. ta bl e 9 below summarizes the register map for the device. accessing any invalid address results in inde terminate data. in the following sections are the detailed descriptions of the registers along with their power- up default values. examples are also included. table 9. registers/pointers address pointers (h) stts751 register map power-up default values binary (dec) device registers name size type 00 temperature value high byte 8 r undefined 01 status 8 r undefined 02 temperature value low byte 8 r undefined 03 configuration 8 r/w 0000 0000 04 conversion rate 8 r/w 0000 0100 05 temperature high limit high byte 8 r/w 0101 0101 (85 c) 06 temperature high limit low byte 8 r/w 0000 0000 07 temperature low limit high byte 8 r/w 0000 0000 (0 c) 08 temperature low limit low byte 8 r/w 0000 0000 0f one-shot 8 w n/a 20 therm limit 8 r/w 0101 0101 (85 c) 21 therm hysteresis 8 r/w 0000 1010 (10 c) 22 smbus timeout enable 8 r/w 1000 0000 (enabled) fd product id register 8 r stts751-0 [0000 0000] stts751-1 [0000 0001] fe manufacturer id 8 r 0101 0011 (53h) ff revision number 8 r 0000 0001
stts751 register summary stts751 14/36 doc id 16483 rev 5 4.1 stts751 register formats and details the stts751 register set is comprised of the 16 addresses shown in ta bl e 9 . the individual registers are accessed by transferri ng their addresses via the smbus interface as shown in section 3.2 , 3.3 , and 3.4 . in the case of the receive byte sequence ( section 3.5 ) the address used is the address sent in the previous write, read or send byte sequence. an example read sequence of the therm hysteresis register, address 21h, with its default value, 0ah, is shown below. the slave address used is 90h. the gray data is sent by the stts751 while the white data is sent by the host. note: all eight bits are used to select the register. 4.2 temperature register format the temperature data is a 12-bit number and is stored in two's complement format spanning the high byte and low byte registers as shown in ta b l e 1 1 . the integer portion of the temperature is stored in the high byte, and the fractional portion in the low byte. the lower four bits of the lo w byte will always read 0. at power-up, the stts751 defaults to 10-bit resolution. thus, bits b5 and b4 of the lower byte will also read 0 until the device is configured to a higher resolution (via the tres bits in the configuration register). table 10. pointer register format start slave address wr ack register address ack start slave address rd ack data nack stop 1001_000 0 0010_0001 1001_000 1 0000_1010 table 11. temperature register (two?s complement) addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 00 r temperature - high byte sign 64 c 32 c 16 c 8 c 4c 2 c 1 c 00 02 r temperature - low byte ? c ? c 1 / 8 c 1 / 16 c 0 0 0 0 00
stts751 stts751 register summary doc id 16483 rev 5 15/36 4.3 temperature limit register format the high and low limit registers have the same format as the temperature register with the integer portion of the two's complement value stored in the high byte and the fractional portion in the low byte. these registers are read-write. note that the high limit defaults to 85 c. 4.4 temperature examples the table below shows several examples of how the data is arranged in the high and low byte pairs used for the temperature and limit registers. note: the maximum and minimum values for the temperature registers are 127.9375 (7f:f0h, high byte : low byte) and ?64 (c0:00h), respectively. this also applies to the high and low limit registers. table 12. temperature limit register (two?s complement format) addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 05 r/w high limit - high byte sign 64 c 32 c 16 c 8 c 4c 2 c 1 c 55 (85 c, dec) 06 r/w high limit - low byte ? c ? c 1 / 8 c 1 / 16 c 0 0 0 0 00 07 r/w low limit - high byte sign 64 c 32 c 16 c 8 c 4c 2 c 1 c 00 08 r/w low limit - low byte ? c ? c 1 / 8 c 1 / 16 c 0 0 0 0 00 table 13. temperature examples (two?s complement format) b7 b6 b5 b4 b3 b2 b1 b0 weighting of the bits high byte sign 64 c 32 c 16 c 8 c 4c 2 c 1 c low byte ? c ? c 1 / 8 c 1 / 16 c 0 0 0 0 ?64 c high byte 1 1 0 0 0 0 0 0 low byte 0 0 0 0 0 0 0 0 ?63 c high byte 1 1 0 0 0 0 0 1 low byte 0 0 0 0 0 0 0 0 ?1 c high byte 1 1 1 1 1 1 1 1 low byte 0 0 0 0 0 0 0 0 +1 c high byte 0 0 0 0 0 0 0 1 low byte 0 0 0 0 0 0 0 0 +5.3125 c (1) high byte 0 0 0 0 0 1 0 1 low byte 0 1 0 1 0 0 0 0 +125 c high byte 0 1 1 1 1 1 0 1 low byte 0 0 0 0 0 0 0 0 1. with 12-bit resolution selected.
stts751 register summary stts751 16/36 doc id 16483 rev 5 4.5 status register the stts751 status register is read-only and located at address 01h. the various status bits function as described below. busy: [7] bit =1 when a temperature conversion is in progress. t high : [6] bit = 1 indicates temperature high limit has been exceeded (t a > high limit). t high is cleared when the status register is re ad, provided the condition no longer exists. t low : [5] bit = 1 indicates the is at or below the low limit (t a low limit). t low is cleared when the status register is read, provided the condition no longer exists. rfu: [4:1] not used - reserved. thrm: [0] bit = 1 indicates the measured temperature has crossed the therm limit. the thrm bit will go low when the temperature falls below the therm limit minus the therm hysteresis. when the thrm bit is high, the addr/therm output will be asserted low. table 14. status register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 01 r status busy t high t low rfu rfu rfu rfu thrm undefined
stts751 stts751 register summary doc id 16483 rev 5 17/36 4.6 configuration register the stts751 configuration register is read/write and controls the functionality of temperature measurements. it is located at address 03h. the configuration register bits function as described below. description mask1: [bit 7] 0: event is enabled. any out-of-limit condit ion asserts the event pin (active low). 1: event is disabled. run /stop: [bit 6] 0: device is running in continuous conversion mode. 1: device is in standby mode drawing minimum power. the run /stop bit controls temperature conversions by the adc. when this bit is 0, the adc converts temperatures in continuous mode, at a rate as selected by the conversion rate register ( section 4.7 ). when the run /stop bit is 1, the adc will be in standby mode, thus reducing current supply significantly. note: the device can still be accessed via the smbus while in standby mode. when run /stop is 1 and the one-sho t register is written to, the adc will execute a temperature measurement and then return to standby mode. [bit 5]: this bit must always be 0. rfu: [bit 4] not used - reserved. table 15. configuration register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 03 r/w configuration mask1 run /stop 0 rfu tres1 tres0 rfu rfu 00
stts751 register summary stts751 18/36 doc id 16483 rev 5 tres1:tres0 [bits 3 and 2] these bits select one of the four programmable resolutions for temperature data on the stts751 providing resolutions down to 0.0625 c/lsb. the default resolution is 10 bits, 0.25 c/lsb. rfu [bits 1 and 0] not used - reserved. 4.7 conversion rate register the stts751 conversion rate register is read/write and controls the number of times the temperature value will be updated ea ch second. the upper four bits of the register are reserved and default to 0 on power-up. the lower four bits control the conversion rate as shown in the table below. the power-up default is 1 conversion per second. the current draw is proportional to the conversion rate, and goes up at higher rates. table 16. conversion resolution tres1:tres0 temperature resolution lsb step size (c) 00 10 bits (default) 0.25 01 11 bits 0.125 11 12 bits 0.0625 10 9 bits 0.5 table 17. conversion rate register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 04 r/w conversion rate 0 0 0 0 conv[3:0] 04 (1/sec)
stts751 stts751 register summary doc id 16483 rev 5 19/36 note: the user must program the conversion rate and resolution bits (tres1:tres0 in the configuration register, address 03h) to be consistent with this table. for a sampling rate of 32 conversions per second, the maximum resolution is 10 bits. for 16 conversions per second, the maximum is 11 bits. 4.8 one-shot register the stts751 can be configured to perform a single temperature conversion on demand. when the device is placed in standby mode (by setting run /stop to 1 in the configuration register) a write to th e one-shot regi ster will invoke a temperature conversion. the device will set the busy bit while the conversion is in progress. the conversion is complete when the busy bit is cleared. the stts751 returns to standby mode upon completion of the conversion. the one-shot register is write-only and is located at address 0fh. the value written to invoke the one-shot conversion is a don't care. the device responds only to the write at address 0fh and ignores the value written. note: writes to the one- shot register will be ig nored when the stts7 51 is in continuous conversion mode (ie. when run /stop=0). table 18. conversion rates conv[3:0] (hex) conversions per second typical current (a) comment 00.0625 15 1 0.125 20.25 30.5 41 20 52 64 78 50 8 16 9, 10, or 11-bit resolutions only 9 32 125 9 or 10-bit resolutions only a-f reserved table 19. one-shot register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 0f w one shot x x x x x x x x n/a
stts751 register summary stts751 20/36 doc id 16483 rev 5 4.9 therm limit the therm limit is a read/write register located at address 20h. the power-on default value is 85 c (55h). the format is 8-bit, two's complement integer. this is the same format as the upper byte of the temperature register ( section 4.2: temperature register format ). whenever the temperature exceeds the value of the therm limit, the addr/therm output will be asserted (low). see section 6 for more information. 4.10 therm hysteresis the therm hysteresis values controls the hysteresis for addr/therm output. once therm output has asserted, it will not de-assert until the temperature has fallen below the respective therm limit minus the therm hysteresis value. see section 5 for more information. the therm hysteresis register is read/write and is located at address 21h. the power-up default value is 10 c (0ah). the format is 8-bit, two's complement integer. 4.11 smbus timeout register at power-up, the stts751 is configured with an smbus timeout of 25 to 35 milliseconds (t timeout ). see section 3.7 for more information. timeout: [bit 7] 1: smbus timeout is enabled. default condition. 0: smbus timeout is disabled. [bits 6:0] not used - reserved. table 20. therm limit addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 20 r/w therm sign 64 c 32 c 16 c 8 c 4 c 2 c 1 c 55 (85 c, dec) table 21. therm hysteresis addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 21 r/w therm hysteresis sign 64 c 32 c 16 c 8 c 4 c 2 c 1 c 0a (10 c, dec) table 22. smbus timeout register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 power-up default (hex) 22 r/w smbus timeout timeout 0 0 0 0 0 0 0 80
stts751 stts751 register summary doc id 16483 rev 5 21/36 4.12 stts751 product id the two versions of the stts751 as shown in ta b l e 1 can be identified via the read-only product id register at address fdh. the stts751-0 has a product id of 00h. the stts751-1 has a product id of 01h. 4.13 stts751 manufacturer?s id the read-only manufacturer's id is located at address feh. for the stts751, the value is 53h. 4.14 stts751 revision id the stts751 revision id register pointer is read-only and can be accessed at address ffh. the value is formatted as an unsigned, 8-bit integer. table 23. product id register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 hex fd r product id 0 0 0 0 0 0 0 0 00: stts751-0 0 0 0 0 0 0 0 1 01: stts751-1 table 24. manufacturer?s id register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 hex fe r mfg id 0 1 0 1 0 0 1 1 53 table 25. revision id register addr (hex) r/w register b7 b6 b5 b4 b3 b2 b1 b0 ff r revision id 0 0 0 0 0 0 0 1
event output stts751 22/36 doc id 16483 rev 5 5 event output the stts751 event output is open drain and requires a pull-up resistor. the event pin is asserted (low) whenever the temperature exceeds the high limit or is equal to or below the low limit. once assert ed, the output will rema in asserted until the stts751 receives an smbus alert response address (ara) from the host and acknowledges with its slave address. the ou tput will be deasserted when the ara is acknowledged. if the triggering c ondition is still true, the output will be rea sserted at the next temperature conversion. figure 6 below shows how the event output functions. figure 6. event output am0 3 0 3 2v1 temper a t u re time event s mb us ara a cknowledged temper a t u re high limit temper a t u re low limit
stts751 addr/therm output doc id 16483 rev 5 23/36 6 addr/therm output the addr/therm pin functions normally as an output to alert the system of an over temperature condition. it is open drain and requires a pull-up resistor. during power-up, the pull-up value is sensed by the stts751 to determine what its sl ave address will be as depicted in ta b l e 1 . the therm output is asserted low whenever the temperature exceeds the therm limit (address 20h). only the upper 8 bits of the temperature register are used in the comparison with the therm limit. once asserted, therm will remain asserted until temperature falls below the therm limit minus the therm hysteresis value. for example, if the therm limit is 25 c, and the therm hysteresis value is 10 c, the therm output will assert when the temperature exceeds 25 c. it will remain asserted until the temperature falls down to or below 15 c (25 ? 10). this pin can be used to control a fan or other failsafe device as shown in figure 4 on page 8 . figure 7 below shows how the therm output functions. figure 7. therm output am0 3 0 33 v1 time addr/therm therm limit therm limit min us therm hy s tere s i s temper a t u re therm hy s tere s i s
maximum ratings stts751 24/36 doc id 16483 rev 5 7 maximum ratings stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not imp lied. exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. table 26. absolute maximum ratings symbol parameter value unit t stg storage temperature (v dd off) ?55 to 150 c t sld (1) 1. reflow at peak temperature of 260 c. the time above 255 c must not exceed 30 seconds. lead solder temperature 260 c v io input or output voltage ?0.3 to v dd + 0.3 v v dd supply voltage 5.0 v i o output current 20 ma ja thermal resistance (junction to ambient) udfn-6l 78 c/w sot23-6l 191
stts751 dc and ac parameters doc id 16483 rev 5 25/36 8 dc and ac parameters this section summarizes the operating measurement conditions, and the dc and ac characteristics of the device. the parameters in the dc and ac characteristics tables that follow, are derived from tests performed under the measurement conditions summarized in table 27: operating and ac measurement conditions . designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. figure 8. ac measurement i/o waveform table 27. operating and ac measurement conditions parameter conditions unit v dd supply voltage - temperature sensor 2.25 to 3.6 v ambient operating temperature (t a ) ?40 to +125 c input rise and fall times 5 ns input pulse voltages 0.2 v dd to 0.8 v dd v input and output timing reference voltages 0.3 v dd to 0.7 v dd v input levels input and output timing reference levels 0.8 * v dd 0.2 * v dd 0.7 * v dd 0.3 * v dd am04731v1
dc and ac parameters stts751 26/36 doc id 16483 rev 5 table 28. dc and ac characteristics symbol description test condition (1) min typ (2) max unit v dd supply voltage 2.25 3.6 v i dd operating current dependent upon conversion rate 0.0625 conversions/second (3) 15 35 a 1 conversion/second (3) 20 40 a 8 conversions/second 50 85 a 32 conversions/second 125 250 a i sb standby current 3 8 a temperature measurement accuracy (4) 2.25 v to 3.6 v 0 c to 85 c 1.0 1.5 c ?40 c to +125 c 2.0 2.5 c resolution stts751 is programmable from 9 bits to 12 bits (0.5 c/lsb to 0.0625 c) 9-bit temperature data 0.5 c/lsb 9bits 10-bit temperature data (default) 0.25 c/lsb 10 bits 11-bit temperature data 0.125 c/lsb 11 bits 12-bit temperature data 0.0625 c/lsb 12 bits t conv conversion time 9-bit 10.5 14 ms 10-bit (default) 21 28 ms 11-bit 42 56 ms 12-bit 84 112 ms v ol low level output voltage addr/therm , event i ol = 4 ma 0.4 v i oh high level output leakage current event , sda, addr/therm v oh = v dd 1a smbus interface inputs (sda, scl) v ih input logic high (scl, sda) 2.3 v v dd 3.6 v 0.7 x v dd v v il input logic low (scl, sda) 2.3 v v dd 3.6 v 0.3 x v dd v i hi logical "1" input current 0 v v in v dd ?1 1 a i li logical "0" input current 0 v v in v dd ?1 1 a c in input capacitance (sda) 5 pf i sink smbus output low sink current sda forced to 0.6 v 6 ma
stts751 dc and ac parameters doc id 16483 rev 5 27/36 v pv pull-up supply voltage (open drain) (addr/therm )?0.3 3.6v event , sda, scl ?0.3 5.5 v v por power on reset threshold (por) - ts v dd falling edge 1.75 v t timeout smbus timeout (5) 25 35 ms t sp spike suppression pulse width of spikes that must be suppressed by the input filter input filter on scl and sda 50 ns 1. valid for ambient operating temperature: t a = ?40 to +125 c; v dd = 2.25 v to 3.6 v (except where noted). 2. typical numbers are for t a = +25 c; v dd = 3.0 v 3. not tested, guaranteed by design. 4. accuracy measurements made at resolutions > 10 bits. 5. smbus timeout min and max are valid for t a = ?30 to +125 c. table 28. dc and ac characteristics (continued) symbol description test condition (1) min typ (2) max unit table 29. ac characteristics symbol description min typ max unit f scl smbus/i 2 c clock frequency 10 400 khz t high clock high period 600 ns t low clock low period 1.3 s t r clock/data rise time 300 ns t f clock/data fall time 300 ns t su:dat data setup time 100 ns t hd:di data in hold time 0 ns t hd:dat data out hold time 300 ns t su:sta start condition setup time 600 ns t hd:sta hold time after (repeated) start condition. after this period, the first clock cycle is generated. 600 ns t su:sto stop condition setup time 600 ns t buf bus free time between stop (p) and start (s) conditions 1.3 s
package mechanical data stts751 28/36 doc id 16483 rev 5 9 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
stts751 package mechanical data doc id 16483 rev 5 29/36 figure 9. udfn-6l (2 mm x 2 mm x 0.5 mm) package mechanical drawing table 30. udfn-6l (2 mm x 2 mm x 0.5 mm) package mechanical data sym mm inches min typ max min typ max a 0.45 0.50 0.55 0.018 0.020 0.022 a1 0.00 0.05 0.000 0.002 a3 0.065 0.003 b 0.20 0.25 0.30 0.008 0.010 0.012 d 1.95 2.00 2.05 0.077 0.079 0.081 e 1.95 2.00 2.05 0.077 0.079 0.081 e0.65 0.026 l 0.50 0.60 0.70 0.020 0.024 0.028 8 1 8 7 8 20_a
package mechanical data stts751 30/36 doc id 16483 rev 5 figure 10. sot23-6l (2.90 mm x 2.80 mm) package mechanical drawing table 31. sot23-6l (2.90 mm x 2.80 mm) package mechanical data sym mm inches min typ max min typ max a1.450.057 a1 0.00 0.15 0.000 0.006 a2 0.90 1.15 1.30 0.035 0.045 0.051 b 0.30 0.50 0.012 0.020 c 0.08 0.22 0.003 0.009 d2.90 0.114 e2.80 0.110 e1 1.60 0.063 e0.95 0.037 e1 1.90 0.075 l 0.30 0.45 0.60 0.012 0.018 0.024 0 4 8 0 4 8 n6 6 7049717_g
stts751 package mechanical data doc id 16483 rev 5 31/36 figure 11. udfn-6l package footprint figure 12. sot23-6l package footprint 8 1 8 7 8 20_a(lp) 7049714_g(lp)
package mechanical data stts751 32/36 doc id 16483 rev 5 figure 13. carrier tape for udfn-6l and sot23-6l packages t k 0 p 1 a 0 b 0 p 2 p 0 center line s of cavity w e f d top cover tape u s er direction of feed am0 3 07 3 v1 table 32. carrier tape dimensions for udfn-6l and sot23-6l packages package w d e p 0 p 2 fa 0 b 0 k 0 p 1 tunit udfn-6l 8.00 0.30 1.50 +0.10/ ?0.00 1.75 0.10 4.00 0.10 2.00 0.05 3.50 0.05 2.20 0.10 2.20 0.10 0.75 0.10 4.00 0.10 0.25 0.05 mm sot23-6l 8.00 +0.30/ ?0.10 1.50 +0.10/ ?0.00 1.75 0.10 4.00 0.10 2.00 0.10 3.50 0.05 3.23 0.10 3.17 0.10 1.37 0.10 4.00 0.10 0.254 0.013 mm
stts751 package mechanical data doc id 16483 rev 5 33/36 figure 14. reel schematic note: the dimensions given in ta b l e 3 3 incorporate tolerances that cover all variations on critical parameters. a d b f u ll r a di us t a pe s lot in core for t a pe s t a rt 2.5mm min.width g me asu red at h ub c n 40mm min. acce ss hole at s lot loc a tion t am0492 8 v1 table 33. reel dimensions for 8 mm carrier tape - udfn-6l and sot23-6l packages a (max) b (min) c d (min) n (min) g t (max) 180 mm (7 inch) 1.5 mm 13 mm 0.2 mm 20.2 mm 60 mm 8.4 mm + 2/?0 mm 14.4 mm
part numbering stts751 34/36 doc id 16483 rev 5 10 part numbering table 34. ordering information scheme for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: stts751-0 dp 3 f device type stts751-0 stts751-1 package dp = udfn-6l wb = sot23-6l temperature range 3 = ?40 c to 125 c shipping method f = ecopack ? package, tape & reel e = ecopack ? package, tubes
stts751 revision history doc id 16483 rev 5 35/36 11 revision history table 35. document revision history date revision changes 06-nov-2009 1 initial release. 21-jan-2010 2 updated features ; removed therm2 throughout document (from section 1 , 2 , 3.8 , 4.6 , 4.10 , 5 , figure 1 , 2 , 3 , 4 , 6 , ta b l e 2 , 3 , 15 , 28 ); updated figure 3 , section 3.4 , section 4.6 , section 4.8 , section 4.10 , ta b l e 1 0 , 11 , 12 , 13 , 14 , 15 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ; added package footprints ( figure 11 and 12 ); minor textual changes. 12-may-2010 3 updated section 3.7 , section 4.11 , section 5 ; figure 6 , 7 , 11 , 12 ; ta b l e 3 , 9 , 25 , 28 , ta b l e 3 1 ; added tape and reel information ( figure 13 , 14 and ta b l e 3 2 , 33 ); minor textual changes in title and document. 01-jul-2010 4 document status upgraded to full datasheet; updated cover page; added footnote to ta b l e 2 8 ; minor textual changes. 20-jul-2010 5 removed footnote from ta bl e 2 8 .
stts751 36/36 doc id 16483 rev 5 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2010 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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