3-channel current and voltage monitor INA3221 0–26 V ±3.2 A with terminal blocks and STEMMA QT/Qwiic – Adafruit 6062

Key features

• INA3221 chip: measures high-side voltage and DC current of three independent power supplies over I2C, with ±1% precision
• High-side or low-side current measurement, up to 26 V DC, while powered at 3–5 V: does not disturb the circuit ground reference
• Also reports the bus voltage, useful for tracking battery charge or solar panel output
• Built-in 0.05 Ω 1% shunt resistors: with a maximum differential input of ±163.8 mV it measures up to ±3.2 A with 0.4 mA resolution (13-bit ADC)
• Advanced users can replace the shunt to change the range (e.g. 0.01 Ω to measure up to 16.4 A with 2 mA resolution)
• Programmable alert outputs (warning and critical) for over-current; configurable averaging
• Pre-attached 3.5 mm terminal blocks and Qwiic-compatible STEMMA QT connectors for I2C: connect without soldering
• I2C logic level equal to the supply voltage; libraries for Arduino and CircuitPython/Python

Technical specifications

• Chip: INA3221
• Channels: 3
• Bus voltage: 0–26 V DC
• Current: ±3.2 A per channel (0.05 Ω 1% shunt)
• Resolution: 0.4 mA (13-bit ADC)
• Accuracy: offset ±80 µV max, gain error 0.25% max
• Power supply: 2.7–5.5 V
• Interface: I2C, address 0x40 (default) or 0x41 with solder jumper
• Dimensions: 38.6 × 22.9 × 10.5 mm
• Weight: 5.8 g

Typical uses

Monitoring multi-rail power systems, battery and solar panel consumption, test benches and data loggers, with Arduino, Raspberry Pi and CircuitPython boards: instead of several multimeters.

Package contents

• 1 INA3221 breakout board with 3.5 mm terminal blocks attached (STEMMA QT cable not included)
• 1 strip of 2.54 mm pin headers