STTS75DS2F

STTS75 Digital temperature sensor and thermal watchdog 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 SO8 Low operating current: 75 A (typ) No external components required 2 2-wire I C/SMBus-compatible serial interface Selectable serial bus address allows connection of up to eight devices on the same bus Thermometer resolution is user-configurable from 9 (default) to 12 bits (0.5 C to 0.0625 C) 9-bit conversion time is 45 ms (typ) MSOP8 (TSSOP8) Programmable temperature threshold and hysteresis set points Wide power supply range-operating voltage range: 2.7 V to 5.5 V Power saving one-shot temperature measurement Power-up defaults permit standalone operation as thermostat Shutdown mode to minimize power consumption Separate open drain output pin operates as an interrupt or comparator/thermostat output (dual purpose event pin) Packages: SO8 MSOP8 (TSSOP8) June 2010 Doc ID 13298 Rev 11 1/41 www.st.com 1Contents STTS75 Contents 1 Description . 6 1.1 Serial communications 6 1.2 Temperature sensor output 6 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 2.9 One-shot mode . 16 3 Functional description 17 3.1 Registers and register set formats 17 3.1.1 Command/pointer register . 17 3.1.2 Configuration register 18 3.1.3 Temperature register . 19 3.1.4 Overlimit temperature register (T ) . 19 OS 3.1.5 Hysteresis temperature register (T ) . 20 HYS 3.2 Power-up default conditions . 20 3.3 Serial interface . 21 3.4 2-wire bus characteristics . 21 3.4.1 Bus not busy . 21 2/41 Doc ID 13298 Rev 11