Features and Benefits

  • Monitors and Controls Speed of up to 4 Fans Independently
  • PWM Outputs Drive each Fan under Software Control
  • FULL_SPEED Input Allows Fans to be Blasted 100% by External Hardware
  • Tristate ADDR Pin Allows up to 3 Devices on a Single Bus
  • Monitors up to 10 Remote Temperature Sensors
  • SMBALERT Interrupt Signals Failures to System Controller
  • Temperature Decoder Interprets TMP05 / TMP06 Temperature Sensors and Communicates Values over I2C Bus
  • See datasheet for additional features

Product Details

The ADT74701 controller is a multichannel temperature sensor and PWM fan controller and fan speed monitor for systems requiring active cooling. It is designed to interface directly to an I2C® bus. The ADT7470 can monitor up to 10 daisy-chained TMP05 temperature sensors. It can also monitor and control the speed of four fans, in automatic or in manual control loops.

A FULL_SPEED input is provided to allow the fans to be blasted to maximum speed, via external hardware control, under extreme thermal conditions or on system startup. An SMBALERT interrupt communicates error conditions such as fan under speed and over temperature measurements to the system service processor. Individual error conditions can then be read from status registers over the I2C bus.


  • Servers
  • Networking and telecommunications equipment
  • Desktops

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.