2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller and Five GPIOs

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Industry's Only Dual Temperature Sensor and Fan Controller with Five GPIOs

Part Details
  • Two Thermal-Diode Inputs
  • Local Temperature Sensor
  • Five GPIO Input/Outputs
  • Two PWM Outputs for Fan Drive (Open Drain; May Be Pulled Up to +5V)
  • Programmable Fan-Control Characteristics
  • Automatic Fan Spin-Up Ensures Fan Start
  • Controlled Rate of Change Ensures Unobtrusive Fan-Speed Adjustments
  • 1°C Remote Temperature Accuracy (+60°C to +145°C)
  • Temperature Monitoring Begins at POR for Fail-Safe System Protection
  • Active-Low OT Output for Throttling or Shutdown
  • Four Versions Available, Each with a Different Address
  • 5mm x 5mm TQFN Package
Additional Details
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The MAX6678 monitors its own temperature and the temperatures of two external diode-connected transistors, which typically reside on the die of a CPU or other integrated circuit. The device reports temperature values in digital form using a 2-wire serial interface. The MAX6678 provides a programmable alarm output to generate interrupts, throttle signals, or overtemperature shutdown signals.

The 2-wire serial interface accepts standard System Management Bus (SMBus™) write byte, read byte, send byte, and receive byte commands to read the temperature data and program the alarm thresholds. The temperature data controls a PWM output signal to adjust the speed of a cooling fan, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. Five GPIO pins provide additional flexibility. The GPIO power-up states are set by connecting the GPIO preset inputs to ground or VCC.

The MAX6678 is available in a 20-pin QSOP package and a 5mm x 5mm thin QFN package. It operates from 3.0V to 5.5V and consumes just 500µA of supply current.


  • Desktop Computers
  • Networking Equipment
  • Notebook Computers
  • Servers
  • Workstations

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