The ADM1023 is a 2-channel digital thermometer and under- and overtemperature alarm for use in personal computers and other systems requiring thermal monitoring and management. Optimized for the Pentium® III, the higher accuracy allows systems designers to safely reduce temperature guard banding and increase system performance. The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which may be provided on-chip with the Pentium III or similar processors; or it 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.
Features
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On-chip and remote temperature sensing
Offset registers for system calibration
1°C accuracy and resolution on local channel
0.125°C resolution/1°C accuracy on remote channel
Programmable over/under temperature limits
Programmable over/under temperature limits
2-wire SMBus serial interface
200 µA max operating current (0.25 conversions/second)
