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MAX6639 - 2-Channel Temperature Monitor

General Description

The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures of two external diode-connected transistors, typically available in CPUs, FPGAs, or GPUs.

Key Features

  • 2 Thermal-Diode Inputs.
  • Up to 25kHz PWM Output Frequency.
  • 3 Selectable SMBus Addresses.
  • Local Temperature Sensor.
  • 1°C Remote Temperature Accuracy.
  • Two PWM Outputs for Fan Drive (Open Drain; Can be Pulled Up to +13.5V).
  • Programmable Fan-Control Characteristics.
  • Automatic Fan Spin-Up Ensures Fan Start.
  • Controlled Rate-of-Change Ensures Unobtrusive Fan-Speed Adjustments.
  • ±3% Fan-Speed Measurement Accuracy.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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www.DataSheet4U.com 19-3682; Rev 0; 5/05 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller General Description The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures of two external diode-connected transistors, typically available in CPUs, FPGAs, or GPUs. The 2-wire serial interface accepts standard System Management Bus (SMBus TM ) write byte, read byte, send byte, and receive byte commands to read the temperature data and program the alarm thresholds. Temperature data can be read at any time over the SMBus, and three programmable alarm outputs can be used to generate interrupts, throttle signals, or overtemperature shutdown signals.