Power Pins

  • VIN - this is the power pin. Since the sensor chip uses 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V
  • 3Vo - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like
  • GND - common ground for power and logic

I2C Logic Pins

  • SCL - I2C clock pin, connect to your microcontroller I2C clock line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
  • SDA - I2C data pin, connect to your microcontroller I2C data line. This pin is level shifted so you can use 3-5V logic, and there's a 10K pullup on this pin.
  • STEMMA QT - These connectors allow you to connect to dev boards with STEMMA QT or Qwiic connectors or to other things with various associated accessories

Other Pins

  • TACH -Tachometer input for 4-pin fans or alert/interrupt pin
  • ALERT - This is the same pin as TACH, it can also be used for interrupts
  • FAN -The fan control output pin for 3 or 4 pin fans. Defaults to PWM output but can be configured to use a DAC to output a DC voltage
  • DN - External temperature diode negative pin
  • DP - External temperature diode positive pin

Jumpers

  • FAN - Cut this jumper to disable the built-in pullup on the Fan pin when using the DAC/DC voltage output
  • TACH - Cut this jumper to disable the pullup on the Tach pin when using the Tach pin for alerts

Either jumper can be bridged with solder later to re-enable the pullup after cutting the jumper

This guide was first published on Dec 15, 2020. It was last updated on Dec 15, 2020.

This page (Pinouts) was last updated on Oct 23, 2021.

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