TC72-3.3MUA - 

TC72 Digital Temperature Sensors
The TC72 series of digital temperature sensors have been developed for temperature management within PC, mobile phone, hard disk drive, entertainment system and office equipment designs amongst many others. You can use the sensors in 2 modes - continuous temperature conversion mode or one-shot conversion mode. Continuous Temperature Conversion Mode measures the temperature every 150 milliseconds and then stores the data in the temperature registers. One-Shot Mode carries out 1 temperature measurement before returning to a shutdown mode.