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