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Product description: INA3221 - current and voltage sensor 0 - 26 V DC 3.2 A - 3-channel - I2C - STEMMA QT / Qwiic - Adafruit 6062
The Adafruit INA3221 module is designed for convenient power monitoring in electronics projects, battery systems, embedded systems, and test setups. The module measures both high-side voltage and DC current draw for three independent channels , allowing you to control multiple power supplies with a single sensor . The board uses 0.05Ω shunt resistors with a 1% tolerance , and the 13-bit ADC provides a current measurement resolution of 0.4mA . Additional features include alarm outputs, I2C addressing, and ready-made libraries for Arduino and CircuitPython/Python , making the module easy to implement in practical applications.
INA3221 - current and voltage sensor 0 - 26 V DC 3.2 A - 3-channel - I2C - STEMMA QT / Qwiic - Adafruit 6062.
The INA3221 allows you to measure the high-side voltage as well as the DC current consumption of up to three power supplies .
Main features of the sensor
- Three measurement channels : enable simultaneous monitoring of three independent power lines
- Voltage measurement from 0 V to 26 V : allows you to monitor the bus voltage in a wide range
- Current measurement up to ±3.2 A per channel : thanks to built-in 0.05 Ω shunt resistors
- High precision measurements : accuracy reaches about ±1%, maximum gain error is 0.25%, and maximum offset voltage is ±80 µV
- High and low side measurement : facilitates current draw analysis without disturbing the system ground reference
- I2C interface : a simple way to communicate with a microcontroller and a single-board computer
- STEMMA QT / Qwiic : quick connection without the need to solder signal wires
- Programmable alerts : available warning lines and signaling of operating parameter exceedances
- Supports 3V and 5V logic : the module can be powered from 2.7V to 5.5V
- Possibility to change the I2C address : default address 0x40, after soldering the jumper 0x41
Pinouts and interfaces of the INA3221 module
The module is equipped with clearly labeled power and communication pins , making integration into the project quick and convenient. The VCC , GND , SDA , and SCL pins are used for basic operation, and the board also includes two STEMMA QT connectors simplify connection to compatible development boards and accessories. You also have three input channels , VIN1 , VIN2 , and VIN3 , each with a positive and negative line, allowing you to independently measure voltage and current for three circuits. The board also features interrupt pins, WRN , CRI , TC , and VALID , enabling the development of more advanced power monitoring systems. These pins can detect exceeded current thresholds, incorrect power-up sequences, or voltage integrity. An additional feature is an address jumper that allows you to change the I2C address and facilitates the use of more than one module on the same bus.
Example of connection with the Feather RP2040 board.
The module can measure current on the high or low side, up to 26 V DC, when powered by 3 V or 5 V.
Current Sensor Compatibility and Programming
The Adafruit INA3221 works with many popular platforms, such as Arduino , Raspberry Pi , CircuitPython boards, and other microcontrollers that support the I2C bus. Compatibility with 3V and 5V logic allows for easy integration with both simple hobby projects and more advanced measurement systems. STEMMA QT/Qwiic connectors further accelerate integration with modern development kits. The manufacturer provides ready-made libraries for Arduino and CircuitPython/Python , significantly reducing implementation time. Reading the bus voltage, shunt voltage, and current for each channel can be accomplished with a few simple commands. This makes the module well-suited for both learning electronics programming and projects requiring continuous energy consumption monitoring.
Technical specifications of the current and voltage sensor
- Measuring system: INA3221
- Number of measurement channels: 3
- Bus voltage measurement range: 0 V to 26 V
- Current measurement range: up to ±3.2 A per channel
- Shunt resistors: 0.05 Ω, 1% tolerance
- Maximum input differential voltage: ±163.8 mV
- Current measurement resolution: 0.4 mA
- ADC: 13-bit
- Maximum offset voltage: ±80 µV
- Maximum gain error: 0.25%
- Communication interface: I2C
- Default I2C address: 0x40
- Alternate I2C address: 0x41
- Module supply voltage: 2.7 V to 5.5 V
- Supported logic levels: 3V and 5V
- Communication connectors: STEMMA QT / Qwiic
- Alarm outputs: WRN, CRI, TC, VALID
- Dimensions: 38.6 x 22.9 x 10.5 mm
- Weight: 5.8 g
Contents of the set
- Adafruit INA3221 module
- Goldpin strip
Elements included in the set.
