LM40 Datasheet | National Semiconductor

LM40 Hardware Monitor with Dual Thermal Diodes and SensorPath™ Bus May 2004 LM40 Hardware Monitor with Dual Thermal Diodes and SensorPath™ Bus General Description The LM40 is a hardware monitor that measures 3 temperature zones, 5 voltages and has a single-wire interface patible with National Semiconductor’s SensorPath bus. SensorPath data is pulse width encoded, thereby allowing the LM40 to be easily connected to many general purpose micro-controllers. Several National Semiconductor Super I/O products include a fully integrated SensorPath master, that when connected to the LM40 can realize a hardware monitor function that includes limit checking for measured values, autonomous fan...