As of June 23rd, 2025 – By popular demand! We've updated this design to expose the 'second' ADC input (B+ and B-), so we've updated this PCB to now come with a 6-pin terminal block port, instead of 4-pin.
The default I2C address for the NAU7802 is 0x2A.
Power Pins
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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
- 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 I2C STEMMA QT / Qwiic connectors or to other things with various associated accessories.
The secondary ADC (pins B+ and B-) are only broken out on rev C of the breakout.
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.
- B+ (rev C only) - Connected to VIN2P, which is Non-Inverting Input #2. It is a differential output from the bridge.
- B- (rev C only) - Connected to VIN2N, which is Inverting Input #2. 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
Page last edited June 24, 2025
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