Power Pins

• VIN - This is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 3V microcontroller like a Feather M4, use 3V, or for a 5V microcontroller like Arduino, use 5V.
  
• AV - This is the AVDD pin. It is the analog power supply pin and can supply 2.4V to 4.0V.
• GND - This is common ground for power and logic.

I2C Logic Pins

The default I2C address for the NAU7802 is 0x2A.

• SCL - I2C clock pin, connect to your microcontroller I2C clock line. There's a 10K pullup on this pin.
• SDA - I2C data pin, connect to your microcontroller I2C data line. There's a 10K pullup on this pin.
• STEMMA QT - These connectors allow you to connect to development boards with STEMMA QT / Qwiic connectors or to other things with various associated accessories.

Terminal Block Pins

• A+ - Connected to VIN1P, which is Non-Inverting Input #1. It is a differential output from the bridge.
• A- - Connected to VIN1N, which is Inverting Input #1. It is a differential output from the bridge.
• E+ - Connected to AVDD for a generated voltage from the NAU7802. It can be configured from 2.4V to 4.0V for a solid positive reference.
• E- - Connected to common ground.

Data Ready Output Pin

• DRDY - Data Ready Output pin. It indicates when a conversion is complete and new data is available for readout

Power LED

• Power LED - In the bottom left corner, below the STEMMA connector, on the front of the board, is the power LED, labeled on. It is the green LED.