Update: 01 October, 2023
The LM32 is a digital temperature sensor from National Semiconductor that measures 3 temperature zones and has a single-wire interface compatible with National Semiconductor's SensorPath bus. Sensor-Path data is pulse width encoded, thereby allowing the LM32 to be easily connected to many general purpose micro-controllers. Several National Semiconductor Super I/O prod- ucts include a fully integrated SensorPath master, that when connected to an LM32 can realize a hardware monitor func- tion that includes limit checking for measured values, au- tonomous fan speed control and many other functions. The LM32 measures the temperature of its own die as well as two external devices such as a processor thermal diode or a diode connected transistor. The LM32 can resolve tem- peratures up to 255˚C and down to -256˚C. The operating temperature range of the LM32 is 0˚C to +125˚C. The ad- dress programming pin allows two LM32s to be placed on one SensorPath bus.
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Publication date: 08 May, 2012
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PDF Link: NATIONAL SEMICONDUCTOR LM32 Dual Thermal Diode Temperature Sensor with SensorPath Bus Manual PDF