STCN75DS2F STMicroelectronics

STCN75 Digital temperature sensor and thermal watchdog Datasheet production data Features Measures temperatures from 55 C to +125 C (67 F to +257 F) 0.5 C (typ) accuracy 2 C (max) accuracy from 25 C to +100 C Low operating current:125 A (typ) MSOP8 (TSSOP8) No external components required 2 2-wire I C/SMBus-compatible serial interface Selectable bus address allows connection of up to eight devices on the bus Wide power supply range - operating voltage range: 2.7 V to 5.5 V Conversion time is 45 ms (typ) Programmable temperature threshold and hysteresis set points Pin- and software-compatible with TCN75 (drop-in replacement) Power-up defaults permit standalone operation as a thermostat Shutdown mode to minimize power consumption Output pin (open drain) can be configured for interrupt or comparator/thermostat mode (dual purpose event pin) MSOP8 (TSSOP8) package March 2012 Doc ID 13307 Rev 9 1/36 This is information on a product in full production. www.st.com 1Contents STCN75 Contents 1 Description . 6 1.1 Serial communications 6 1.2 Temperature sensor output 7 1.3 Pin descriptions . 8 1.3.1 SDA (open drain) . 8 1.3.2 SCL . 8 1.3.3 OS/INT (open drain) 8 1.3.4 GND . 9 1.3.5 A2, A1, A0 9 1.3.6 V DD . 9 2 Operation . 10 2.1 Applications information 11 2.2 Thermal alarm function 11 2.3 Comparator mode 12 2.4 Interrupt mode . 12 2.5 Fault tolerance . 13 2.6 Shutdown mode 13 2.7 Temperature data format . 14 3 Functional description 15 3.1 Registers and register set formats 15 3.1.1 Command/pointer register . 15 3.1.2 Configuration register 16 3.1.3 Temperature register . 17 3.1.4 Overlimit temperature register (T ) . 17 OS 3.1.5 Hysteresis temperature register (T ) . 18 HYS 3.2 Power-up default conditions . 18 3.3 Serial interface . 19 3.4 2-wire bus characteristics . 19 3.4.1 Bus not busy . 19 3.4.2 Start data transfer . 19 3.4.3 Stop data transfer . 19 2/36 Doc ID 13307 Rev 9