The TC74 is a serially accessible digital temperature sensor that can determine temperatures in the range of 25°C to 85°C with ±2° absolute accuracy or 0°C to 125°C with ±3° absolute accuracy. Temperature infor-mation is retrieved from the TC74 via a two wire SMBus/I 2 C ™ compatible interface. The TC74 repre-sents the temperature as an 8-bit two’s complement signed integer that has a direct correspondence to the device’s temperature in degrees C resulting in a 1° tem-perature resolution. The TC74 is available in eight address versions so that eight devices can be moni-toredonthesametwowireSMBusinterfacewithno additional circuitry. TB050 Monitoring Multiple Temperature Nodes Using TC74 Thermal Sensors and a PIC16C505 additional circuitry, although care should be taken to Author: Ward Brown ensure that the combination of the PIC16C505 internal Microchip Technology Inc. pull-up impedance with the cumulative load capaci- tance meets the timing requirements of the TC74. Proper ……