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| 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 allows single pin to select one of four slave addresses Supports 400 kHz serial clock UDFN-6L SOT23-6L SMBus 2.0 compatible - SMBus ALERT (ARA) support - SMBus timeout RoHS/green Applications Solid state drives Portable electronics Notebook computers Smart batteries Servers Telecom Table 1. Device summary Pull-up resistor value 7.5 K 5% SMBus address 1001 000 b 1001 001 b 0111 000 b 0111 001 b 1001 010 b 1001 011 b 0111 010 b 0111 011 b Address selection via resistor pull-up on Addr/Therm pin Address selection via resistor pull-up on Addr/Therm pin Comments Order code STTS751-0DP3F STTS751-0WB3F 12 K 5% 20 K 5% 33 K 5% 7.5 K 5% STTS751-1DP3F STTS751-1WB3F 12 K 5% 20 K 5% 33 K 5% July 2010 Doc ID 16483 Rev 5 1/36 www.st.com 1 Contents STTS751 Contents 1 2 3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 SMBus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 SMBus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 WRITE byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 READ byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SEND byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 RECEIVE byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SMBus addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 SMBus timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Alert response address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 STTS751 register summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 STTS751 register formats and details . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Temperature register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Temperature limit register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Temperature examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Status register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 One-shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Therm limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Therm hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SMBus timeout register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 STTS751 product ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 STTS751 manufacturer's ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 STTS751 revision ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 EVENT output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/36 Doc ID 16483 Rev 5 STTS751 Contents 6 7 8 9 10 11 Addr/Therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Doc ID 16483 Rev 5 3/36 List of tables STTS751 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. Table 28. Table 29. Table 30. Table 31. Table 32. Table 33. Table 34. Table 35. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SMBus WRITE byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SMBus READ byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SMBus SEND byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SMBus RECEIVE byte protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SMBus protocol response to ARA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Registers/pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Pointer register format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Temperature register (two's complement) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Temperature limit register (two's complement format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Temperature examples (two's complement format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Conversion resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Conversion rate register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Conversion rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 One-shot register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Therm limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Therm hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SMBus timeout register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Product ID register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Manufacturer's ID register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Revision ID register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 UDFN-6L (2 mm x 2 mm x 0.5 mm) package mechanical data . . . . . . . . . . . . . . . . . . . . . 29 SOT23-6L (2.90 mm x 2.80 mm) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . 30 Carrier tape dimensions for UDFN-6L and SOT23-6L packages . . . . . . . . . . . . . . . . . . . . 32 Reel dimensions for 8 mm carrier tape - UDFN-6L and SOT23-6L packages . . . . . . . . . . 33 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4/36 Doc ID 16483 Rev 5 STTS751 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pinout - SOT23-6L and UDFN-6L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Application hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 SMBus timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 EVENT output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Therm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 UDFN-6L (2 mm x 2 mm x 0.5 mm) package mechanical drawing . . . . . . . . . . . . . . . . . . 29 SOT23-6L (2.90 mm x 2.80 mm) package mechanical drawing. . . . . . . . . . . . . . . . . . . . . 30 UDFN-6L package footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 SOT23-6L package footprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Carrier tape for UDFN-6L and SOT23-6L packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Doc ID 16483 Rev 5 5/36 Description STTS751 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 nominally 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 STTS751 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 VDD (1) SDA STTS751-0 STTS751-1 SCL EVENT Addr/Therm GND 1. This pin may not float. AM03028v1 Table 2. Signal names Type Output Output I/O Input Power Ground Description Address selection pin / thermal status pin Event (alert) output SMBus interface data I/O SMBus interface clock input Device power supply Device ground Symbol Addr/Therm EVENT SDA SCL VDD GND 6/36 Doc ID 16483 Rev 5 STTS751 Figure 2. Pinout - SOT23-6L and UDFN-6L SOT23-6L UDFN-6L Description Addr/Therm GND VDD 1 2 3 6 5 4 SDA EVENT SCL SCL EVENT VDD 1 2 3 6 5 4 SDA GND Addr/Therm AM03029v1 Table 3. Pin Pin descriptions Name Description SOT23-6L UDFN-6L 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 Table 1. Addr/Therm This pin must have a pull-up resistor connected to the same voltage as VDD 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. GND VDD SCL EVENT SDA GND Power supply VDD SMBus clock Open-drain interrupt output. Output supports the SMBus Alert (ARA). Note: This pin may not float. SMBus data input/output 1 4 2 3 4 5 6 5 3 1 2 6 Doc ID 16483 Rev 5 7/36 Description Figure 3. Block diagram V DD STTS751 REGISTERS Address Pointers Temperature Registers Status SDA SMBus Interface Configuration Conversion Rate SCL VDD High Limit Registers Interrupt Enabling Low Limit Registers One-Shot Therm LIMIT Addr/Therm Therm HYSTERESIS EVENT Sensor Control Logic SMBus Timeout Product ID Manufacturer ID A to D Converter Revision ID Digital Comparator Alert Response GND AM03030v1 Figure 4. VDD Application hardware hookup SCL SDA R STTS751-0 STTS751-1 EVENT Host Controller Addr/Therm Fan Driver GND AM03031v1 8/36 Doc ID 16483 Rev 5 STTS751 Functional description 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 samples 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 respond 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. Doc ID 16483 Rev 5 9/36 SMBus interface STTS751 3 3.1 SMBus interface 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 TLOW THIGH THD; STA TSU:STO SMCLK TR THD; STA THD:DAT TSU:DAT TF TSU:STA SMDATA P TBUF S S P S - start condition P - stop condition AM03067v1 The STTS751 supports standard SMBus protocols (see Table 4, 5, 6, and 7). WRITE byte READ byte SEND byte RECEIVE byte Alert response address 10/36 Doc ID 16483 Rev 5 STTS751 SMBus interface 3.2 WRITE byte The WRITE byte protocol is used to write one byte of data to the registers as shown in Table 4. The gray data is sent by the STTS751 while the white data is sent by the host. Table 4. Start 1 bit SMBus WRITE byte protocol Slave address 7 bits WR 1 bit ACK 1 bit Register address 8 bits ACK 1 bit Data 8 bits ACK 1 bit Stop 1 bit 3.3 READ byte The READ byte protocol is used to read one byte of data from the registers as shown in Table 5. Table 5. SMBus READ byte protocol WR 1 bit ACK 1 bit Register address 8 bits ACK Start Slave address RD 1 bit 1 bit 7 bits ACK Data 8 bits NACK Stop 1 bit 1 bit Start Slave address 1 bit 7 bits 1 bit 1 bit 3.4 SEND byte The SEND byte protocol is used to set the internal address register to the correct address. It sends a register address with no data (see Table 6). The SEND byte can be followed by the RECEIVE byte protocol described below in order to read data from the register. Table 6. Start 1 bit SMBus SEND byte protocol Slave address 7 bits WR 1 bit ACK 1 bit Register address 8 bits ACK 1 bit Stop 1 bit 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 Table 7). This can be used for consecutive reads of the same register. Table 7. Start 1 bit SMBus RECEIVE byte protocol Slave address 7 bits RD 1 bit ACK 1 bit Data 8 bits NACK 1 bit Stop 1 bit Doc ID 16483 Rev 5 11/36 SMBus interface STTS751 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 Table 1 for valid address and recommended resistor 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 tTIMEOUT (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 temperature measurement, the EVENT output will be asserted. In response, the host (supporting the ARA protocol) will send the SMBus Alert Response Address to the general (slave) address of 0001_100b. All devices with active interrupts will respond with their client addresses as shown in Table 1 on page 1 (with the LSB bit set to 0). The STTS751 will acknowledge the ARA and respond with its slave device address. Table 8 shows the ARA transfer. See Section 5 for more information. Table 8. Field Bits SMBus protocol response to ARA START 1 ALERT RESPONSE ADDRESS 7 RD 1 ACK 1 STTS751 SLAVE ADDRESS 8 NACK 1 STOP 1 12/36 Doc ID 16483 Rev 5 STTS751 STTS751 register summary 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. Table 9 below summarizes the register map for the device. Accessing any invalid address results in indeterminate data. Table 9. Registers/pointers STTS751 register map Device registers name Temperature value high byte Status Temperature value low byte Configuration Conversion rate Temperature high limit high byte Temperature high limit low byte Temperature low limit high byte Temperature low limit low byte One-shot THERM limit THERM hysteresis SMBus timeout enable Size 8 8 8 8 8 8 8 8 8 8 8 8 8 Type R R R R/W R/W R/W R/W R/W R/W W R/W R/W R/W Power-up default values binary (dec) undefined undefined undefined 0000 0000 0000 0100 0101 0101 (85 C) 0000 0000 0000 0000 (0 C) 0000 0000 N/A 0101 0101 (85 C) 0000 1010 (10 C) 1000 0000 (Enabled) STTS751-0 [0000 0000] STTS751-1 [0000 0001] 0101 0011 (53h) 0000 0001 Address pointers (h) 00 01 02 03 04 05 06 07 08 0F 20 21 22 FD Product ID register 8 R FE FF Manufacturer ID Revision number 8 8 R R In the following sections are the detailed descriptions of the registers along with their powerup default values. Examples are also included. Doc ID 16483 Rev 5 13/36 STTS751 register summary STTS751 4.1 STTS751 register formats and details The STTS751 register set is comprised of the 16 addresses shown in Table 9. The individual registers are accessed by transferring 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. Table 10. Pointer register format DATA 0000_1010 NACK STOP SLAVE REGISTER SLAVE START WR ACK ACK START RD ACK ADDRESS ADDRESS ADDRESS 1001_000 0 0010_0001 1001_000 1 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 Table 11. Table 11. ADDR (hex) 00 02 R/W R R Temperature register (two's complement) Register Temperature - high byte Temperature - low byte b7 sign b6 64 C 1/4 C b5 32 C 1/ 8 b4 16 C 1/ 16 b3 8 C 0 b2 4C 0 b1 2 C 0 b0 1 C 0 Power-up default (hex) 00 00 1/2 C C C 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 low 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). 14/36 Doc ID 16483 Rev 5 STTS751 STTS751 register summary 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. Table 12. ADDR (hex) 05 06 07 08 Temperature limit register (two's complement format) Register High limit - high byte High limit - low byte Low limit - high byte Low limit - low byte b7 sign b6 b5 b4 16 C 1/ 16 R/W R/W R/W R/W R/W b3 8 C 0 8 C 0 b2 4C 0 4C 0 b1 b0 Power-up default (hex) 64 C 32 C 1/ 8 2 C 1 C 55 (85 C, dec) 0 0 00 00 00 1/2 C 1/4 C sign C C 64 C 32 C 1 16 C 1 2 C 1 C 0 0 1/2 C 1/4 C /8 C /16 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. Table 13. Temperature examples (two's complement format) b7 b6 64 C 1/4 C 1 0 1 0 1 0 0 0 0 1 1 0 b5 32 C 1 b4 16 C 1 b3 8 C 0 0 0 0 0 1 0 0 0 0 0 1 0 b2 4C 0 0 0 0 0 1 0 0 0 1 0 1 0 b1 2 C 0 0 0 0 0 1 0 0 0 0 0 0 0 b0 1 C 0 0 0 1 0 1 0 1 0 1 0 1 0 Weighting of the bits -64 C -63 C -1 C +1 C +5.3125 C(1) +125 C High byte Low byte High byte Low byte High byte Low byte High byte Low byte High byte Low byte High byte Low byte High byte Low byte sign 1/2 C 1 0 1 0 1 0 0 0 0 0 0 0 /8 C 0 0 0 0 1 0 0 0 0 0 1 0 /16 C 0 0 0 0 1 0 0 0 0 1 1 0 1. With 12-bit resolution selected. 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. Doc ID 16483 Rev 5 15/36 STTS751 register summary STTS751 4.5 Table 14. ADDR (hex) 01 Status register Status register Register Status b7 Busy b6 THIGH b5 TLOW b4 RFU b3 RFU b2 RFU b1 b0 Power-up default (hex) undefined R/W R RFU THRM 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. THIGH: [6] Bit = 1 indicates temperature high limit has been exceeded (TA > high limit). THIGH is cleared when the status register is read, provided the condition no longer exists. TLOW: [5] Bit = 1 indicates the is at or below the low limit (TA low limit). TLOW 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. 16/36 Doc ID 16483 Rev 5 STTS751 STTS751 register summary 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. Table 15. ADDR (hex) Configuration register Register b7 b6 b5 b4 b3 b2 b1 b0 Power-up default (hex) 00 R/W 03 R/W Configuration MASK1 RUN/STOP 0 RFU Tres1 Tres0 RFU RFU Description MASK1: [bit 7] 0: EVENT is enabled. Any out-of-limit condition 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-shot 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. Doc ID 16483 Rev 5 17/36 STTS751 register summary Tres1:Tres0 [bits 3 and 2] STTS751 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. Table 16. Conversion resolution Tres1:Tres0 00 01 11 10 Temperature resolution 10 bits (default) 11 bits 12 bits 9 bits LSB step size (C) 0.25 0.125 0.0625 0.5 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 each second. Table 17. ADDR (hex) 04 Conversion rate register Register Conversion rate b7 0 b6 0 b5 0 b4 0 b3 b2 b1 b0 Power-up default (hex) 04 (1/sec) R/W R/W CONV[3:0] 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. 18/36 Doc ID 16483 Rev 5 STTS751 STTS751 register summary Table 18. Conversion rates Conversions per second 0.0625 0.125 0.25 0.5 1 2 4 8 16 32 reserved 125 50 9, 10, or 11-bit resolutions only 9 or 10-bit resolutions only 20 Typical current (A) 15 Comment CONV[3:0] (hex) 0 1 2 3 4 5 6 7 8 9 A-F 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 the one-shot register 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 ignored when the STTS751 is in continuous conversion mode (ie. when RUN/STOP=0). One-shot register Register One shot b7 X b6 X b5 X b4 X b3 X b2 X b1 X b0 X Power-up default (hex) n/a Table 19. ADDR (hex) 0F R/W W Doc ID 16483 Rev 5 19/36 STTS751 register summary STTS751 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. Table 20. ADDR (hex) 20 Therm limit Register Therm b7 sign b6 64 C b5 32 C b4 16 C b3 8 C b2 4 C b1 b0 Power-up default (hex) 55 (85 C, dec) R/W R/W 2 C 1 C 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. Table 21. ADDR (hex) 21 Therm hysteresis Register Therm hysteresis b7 sign b6 64 C b5 32 C b4 16 C b3 8 C b2 4 C b1 b0 Power-up default (hex) 0A (10 C, dec) R/W R/W 2 C 1 C 4.11 SMBus timeout register At power-up, the STTS751 is configured with an SMBus timeout of 25 to 35 milliseconds (tTIMEOUT). See Section 3.7 for more information. Table 22. ADDR (hex) 22 SMBus timeout register Register b7 b6 0 b5 0 b4 0 b3 0 b2 0 b1 0 b0 0 Power-up default (hex) 80 R/W R/W SMBus timeout TIMEOUT TIMEOUT: [bit 7] 1: SMBus timeout is enabled. Default condition. 0: SMBus timeout is disabled. [bits 6:0] Not used - reserved. 20/36 Doc ID 16483 Rev 5 STTS751 STTS751 register summary 4.12 STTS751 product ID The two versions of the STTS751 as shown in Table 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. Table 23. ADDR (hex) FD Product ID register R/W R Register Product ID b7 0 0 b6 0 0 b5 0 0 b4 0 0 b3 0 0 b2 0 0 b1 0 0 b0 0 1 hex 00: STTS751-0 01: STTS751-1 4.13 STTS751 manufacturer's ID The read-only manufacturer's ID is located at address FEh. For the STTS751, the value is 53h. Table 24. ADDR (hex) FE Manufacturer's ID register R/W R Register Mfg ID b7 0 b6 1 b5 0 b4 1 b3 0 b2 0 b1 1 b0 1 hex 53 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 25. ADDR (hex) FF Revision ID register R/W R Register Revision ID b7 0 b6 0 b5 0 b4 0 b3 0 b2 0 b1 0 b0 1 Doc ID 16483 Rev 5 21/36 EVENT output STTS751 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 asserted, the output will remain asserted until the STTS751 receives an SMBus Alert Response Address (ARA) from the host and acknowledges with its slave address. The output will be deasserted when the ARA is acknowledged. If the triggering condition is still true, the output will be reasserted at the next temperature conversion. Figure 6 below shows how the EVENT output functions. Figure 6. EVENT output Temperature Temperature high limit Temperature low limit Time EVENT SMBus ARA acknowledged AM03032v1 22/36 Doc ID 16483 Rev 5 STTS751 Addr/Therm output 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 slave address will be as depicted in Table 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 Temperature Therm limit Therm Limit minus Therm Hysteresis Therm Hysteresis Time Addr/Therm AM03033v1 Doc ID 16483 Rev 5 23/36 Maximum ratings STTS751 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 implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 26. Symbol TSTG TSLD(1) VIO VDD IO JA Absolute maximum ratings Parameter Storage temperature (VDD off) Lead solder temperature Input or output voltage Supply voltage Output current UDFN-6L Thermal resistance (junction to ambient) SOT23-6L 191 Value -55 to 150 260 -0.3 to VDD + 0.3 5.0 20 78 C/W Unit C C V V mA 1. Reflow at peak temperature of 260 C. The time above 255 C must not exceed 30 seconds. 24/36 Doc ID 16483 Rev 5 STTS751 DC and AC parameters 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. Table 27. Operating and AC measurement conditions Parameter Conditions 2.25 to 3.6 -40 to +125 5 0.2 VDD to 0.8 VDD 0.3 VDD to 0.7 VDD Unit V C ns V V VDD supply voltage - temperature sensor Ambient operating temperature (TA) Input rise and fall times Input pulse voltages Input and output timing reference voltages Figure 8. AC measurement I/O waveform Input levels 0.8 * VDD 0.2 * VDD Input and output timing reference levels 0.7 * VDD 0.3 * VDD AM04731v1 Doc ID 16483 Rev 5 25/36 DC and AC parameters Table 28. Symbol VDD STTS751 DC and AC characteristics Description Supply voltage 0.0625 conversions/second(3) Test condition(1) Min 2.25 15 20 50 125 3 Typ(2) Max 3.6 35 40 85 250 8 Unit V A A A A A IDD Operating current dependent upon conversion rate 1 conversion/second(3) 8 conversions/second 32 conversions/second ISB Standby current Temperature measurement Accuracy(4) 0 C to 85 C 2.25 V to 3.6 V -40 C to +125 C 9-bit temperature data 10-bit temperature data (default) 11-bit temperature data 11 0.0625 12-bit temperature data 12 9-bit 10-bit (default) tCONV Conversion time 11-bit 12-bit VOL IOH Low level output voltage Addr/Therm, EVENT High level output leakage current EVENT, SDA, Addr/Therm IOL = 4 mA VOH = VDD 42 84 56 112 0.4 1 ms ms V A 10.5 21 14 28 bits ms ms bits C/LSB 1.0 2.0 0.5 9 0.25 10 0.125 1.5 2.5 C C C/LSB bits C/LSB bits C/LSB Resolution STTS751 is programmable from 9 bits to 12 bits (0.5 C/LSB to 0.0625 C) SMBus interface inputs (SDA, SCL) VIH VIL IHI ILI CIN ISINK Input logic high (SCL, SDA) Input logic low (SCL, SDA) Logical "1" input current Logical "0" input current Input capacitance (SDA) SMBus output low sink current SDA forced to 0.6 V 6 2.3 V VDD 3.6 V 2.3 V VDD 3.6 V 0 V VIN VDD 0 V VIN VDD -1 -1 5 0.7 x VDD 0.3 x VDD 1 1 V V A A pF mA 26/36 Doc ID 16483 Rev 5 STTS751 Table 28. Symbol VPV VPOR tTIMEOUT tSP DC and AC parameters DC and AC characteristics (continued) Description Pull-up supply voltage (open drain) Power On Reset threshold (POR) - TS SMBus timeout(5) Spike suppression Pulse width of spikes that must be suppressed by the input filter Input filter on SCL and SDA Test condition(1) (Addr/Therm) EVENT, SDA, SCL VDD falling edge 25 Min -0.3 -0.3 1.75 35 50 Typ(2) Max 3.6 5.5 Unit V V V ms ns 1. Valid for ambient operating temperature: TA = -40 to +125 C; VDD = 2.25 V to 3.6 V (except where noted). 2. Typical numbers are for TA = +25 C; VDD = 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 TA = -30 to +125 C. Table 29. Symbol fSCL tHIGH tLOW tR tF tSU:DAT tHD:DI tHD:DAT tSU:STA tHD:STA tSU:STO tBUF AC characteristics Description SMBus/I2C clock frequency Clock high period Clock low period Clock/data rise time Clock/data fall time Data setup time Data in hold time Data out hold time Start condition setup time Hold time after (repeated) start condition. After this period, the first clock cycle is generated. Stop condition setup time Bus free time between stop (P) and start (S) conditions 100 0 300 600 600 600 1.3 Min 10 600 1.3 300 300 Typ Max 400 Unit kHz ns s ns ns ns ns ns ns ns ns s Doc ID 16483 Rev 5 27/36 Package mechanical data STTS751 9 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 28/36 Doc ID 16483 Rev 5 STTS751 Figure 9. Package mechanical data UDFN-6L (2 mm x 2 mm x 0.5 mm) package mechanical drawing 8187820_A Table 30. Sym UDFN-6L (2 mm x 2 mm x 0.5 mm) package mechanical data mm Min Typ 0.50 Max 0.55 0.05 0.065 0.20 1.95 1.95 0.25 2.00 2.00 0.65 0.50 0.60 0.70 0.020 0.30 2.05 2.05 0.008 0.077 0.077 Min 0.018 0.000 0.003 0.010 0.079 0.079 0.026 0.024 0.028 0.012 0.081 0.081 inches Typ 0.020 Max 0.022 0.002 A A1 A3 b D E e L 0.45 0.00 Doc ID 16483 Rev 5 29/36 Package mechanical data Figure 10. SOT23-6L (2.90 mm x 2.80 mm) package mechanical drawing STTS751 7049717_G Table 31. Sym SOT23-6L (2.90 mm x 2.80 mm) package mechanical data mm Min Typ Max 1.45 0.00 0.90 0.30 0.08 2.90 2.80 1.60 0.95 1.90 0.30 0 0.45 4 6 0.60 8 0.012 0 1.15 0.15 1.30 0.50 0.22 0.000 0.035 0.012 0.003 0.114 0.110 0.063 0.037 0.075 0.018 4 6 0.024 8 0.045 Min inches Typ Max 0.057 0.006 0.051 0.020 0.009 A A1 A2 b c D E E1 e e1 L N 30/36 Doc ID 16483 Rev 5 STTS751 Figure 11. UDFN-6L package footprint Package mechanical data 8187820_A(LP) Figure 12. SOT23-6L package footprint 7049714_G(LP) Doc ID 16483 Rev 5 31/36 Package mechanical data Figure 13. Carrier tape for UDFN-6L and SOT23-6L packages STTS751 P0 D T P2 E A0 TOP COVER TAPE B0 F W K0 CENTER LINES OF CAVITY P1 USER DIRECTION OF FEED AM03073v1 Table 32. Package UDFN-6L Carrier tape dimensions for UDFN-6L and SOT23-6L packages W 8.00 0.30 8.00 +0.30/ -0.10 D 1.50 +0.10/ -0.00 1.50 +0.10/ -0.00 E 1.75 0.10 1.75 0.10 P0 4.00 0.10 4.00 0.10 P2 2.00 0.05 2.00 0.10 F 3.50 0.05 3.50 0.05 A0 2.20 0.10 3.23 0.10 B0 2.20 0.10 3.17 0.10 K0 0.75 0.10 1.37 0.10 P1 4.00 0.10 T 0.25 0.05 Unit mm SOT23-6L 4.00 0.254 mm 0.10 0.013 32/36 Doc ID 16483 Rev 5 STTS751 Figure 14. Reel schematic Package mechanical data T 40mm min. Access hole At slot location B D C A N Tape slot In core for Full radius Tape start 2.5mm min.width G measured At hub AM04928v1 Table 33. A (max) 180 mm (7 inch) Reel dimensions for 8 mm carrier tape - UDFN-6L and SOT23-6L packages B (min) 1.5 mm C 13 mm 0.2 mm D (min) 20.2 mm N (min) 60 mm G 8.4 mm + 2/-0 mm T (max) 14.4 mm Note: The dimensions given in Table 33 incorporate tolerances that cover all variations on critical parameters. Doc ID 16483 Rev 5 33/36 Part numbering STTS751 10 Part numbering Table 34. Example: Ordering information scheme 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(R) package, tape & reel E = ECOPACK(R) package, tubes For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. 34/36 Doc ID 16483 Rev 5 STTS751 Revision history 11 Revision history Table 35. Date 06-Nov-2009 Document revision history Revision 1 Initial release. Updated Features; removed Therm2 throughout document (from Section 1, 2, 3.8, 4.6, 4.10, 5, Figure 1, 2, 3, 4, 6, Table 2, 3, 15, 28); updated Figure 3, Section 3.4, Section 4.6, Section 4.8, Section 4.10, Table 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25; added package footprints (Figure 11 and 12); minor textual changes. Updated Section 3.7, Section 4.11, Section 5; Figure 6, 7, 11, 12; Table 3, 9, 25, 28, Table 31; added tape and reel information (Figure 13, 14 and Table 32, 33); minor textual changes in title and document. Document status upgraded to full datasheet; updated cover page; added footnote to Table 28; minor textual changes. Removed footnote from Table 28. Changes 21-Jan-2010 2 12-May-2010 3 01-Jul-2010 20-Jul-2010 4 5 Doc ID 16483 Rev 5 35/36 STTS751 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2010 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 36/36 Doc ID 16483 Rev 5 |
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