NCT210

NCT210 Low Cost Microprocessor System Temperature Monitor Microcomputer The NCT210 is a two-channel digital thermometer and under/overtemperature alarm, intended for use in personal computers and other systems requiring thermal monitoring and management. The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which can be provided on-chip with the processor, or can be a low cost discrete NPN/PNP device, such as the 2N3904/2N3906. A novel measurement technique cancels out the absolute value of the transistor’s base emitter voltage so that no calibration is required. The second measurement channel measures the output of an on-chip temperature sensor to monitor the temperature of the device and its environment. The NCT210 communicates over a two-wire serial interface compatible with SMBus standards. Under/overtemperature limits can be programmed into the device over the serial bus, and an ALERT output signals when the on-chip or remote temperature is out of range. This output can be used as an interrupt or as an SMBus alert. Features http://onsemi.com QSOP−16 CASE 492 PIN ASSIGNMENT NC VDD D+ D− NC ADD1 GND GND 1 2 3 4 5 6 7 8 16 15 14 NC STBY SCLK NC SDATA ALERT ADD0 NC NCT210 (Top View) 13 12 11 10 9 Alternative to the ADM1021A On-chip and Remote Temperature Sensing No Calibration Necessary 1°C Accuracy for On-chip Sensor 3°C Accuracy for Remote Sensor Programmable Over/Undertemperature L...