Update: 29 September, 2023
The MAX6639 is a temperature monitor that monitors its own temperature and the temperature of an external diode-connected transistor or two external diode-connected transistors typically found in CPUs, FPGAs, or GPUs. It features a 2-wire serial interface that accepts SMBus commands for reading temperature data and setting alarm thresholds. Temperature data can be read at any time over the SMBus, and three programmable alarm outputs can be used for generating interrupts, throttle signals, or overtemperature shutdown signals. The temperature data is also used by the internal dual-PWM fan-speed controller to adjust the speed of up to two cooling fans, providing minimum noise when the system is running cool and maximum cooling when power dissipation increases. Speed control is achieved through tachometer feedback from the fan, ensuring control of the fan speed rather than just the PWM duty cycle. The speed measurement accuracy is ±4%. The MAX6639 is available in 16-pin QSOP and 16-pin thin QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V and consumes just 500µA of supply current. It is suitable for applications such as desktop computers, notebook computers, projectors, servers, and networking equipment.
File format: PDF
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MD5 Checksum: 6F60405E2FB84EFAD0E65E8BEAD611A6
Publication date: 11 April, 2012
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PDF Link: MAXIM MAX6639/MAX6639F Manual PDF