The MAX6639 monitors its own temperature and oneexternal diode-connected transistor or the temperaturesof two external diode-connected transistors, typicallyavailable in CPUs, FPGAs, or GPUs. The 2-wire serialinterface accepts standard System Management Bus(SMBus) write byte, read byte, send byte, and receivebyte commands to read the temperature data and programthe alarm thresholds. Temperature data can beread at any time over the SMBus, and three programmablealarm outputs can be used to generate interrupts,throttle signals, or overtemperature shutdownsignals.
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