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.

This guide was first published on May 29, 2022. It was last updated on Apr 18, 2024.

This page (Pinouts) was last updated on Mar 08, 2024.

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