STLM75M2F STMicroelectronics

STLM75 Digital temperature sensor and thermal watchdog Features Measures temperatures from 55C to +125C (67F to +257F) 0.5C (typ) accuracy 2C (max) accuracy from 25C to +100C Low operating current: 125 A (typ) SO8 No external components required 2 2-wire I C/SMBus-compatible serial interface Supports bus time-out feature 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 150 ms (max) MSOP8 (TSSOP8) Programmable temperature threshold and hysteresis set points Pin- and software-compatible with LM75 (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) Packages: SO8 MSOP8 (TSSOP8) August 2010 Doc ID 13296 Rev 12 1/40 www.st.com 1Contents STLM75 Contents 1 Description . 6 1.1 Serial communications 6 1.2 Temperature sensor output 7 1.3 Pin descriptions . 9 1.3.1 SDA (open drain) . 9 1.3.2 SCL . 9 1.3.3 OS/INT (open drain) 9 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 12 2.3 Comparator mode 12 2.4 Interrupt mode . 13 2.5 Fault tolerance . 14 2.6 Shutdown mode 14 2.7 Temperature data format . 15 2.8 Bus timeout feature . 15 3 Functional description 16 3.1 Registers and register set formats 16 3.1.1 Command/pointer register . 16 3.1.2 Configuration register 17 3.1.3 Temperature register . 18 3.1.4 Overlimit temperature register (T ) . 18 OS 3.1.5 Hysteresis temperature register (T ) . 19 HYS 3.2 Power-up default conditions . 19 3.3 Serial interface . 20 3.4 2-wire bus characteristics . 20 3.4.1 Bus not busy . 20 3.4.2 Start data transfer . 20 2/40 Doc ID 13296 Rev 12