INA228 I2C High / Low Side Power Monitor 85V 20-bit – STEMMA QT / Qwiic Compatible

The INA228 is a high-precision power monitoring module designed for measuring DC current, bus voltage, and power on either the high side or low side of a circuit. It features a 20-bit ADC and supports bus voltages up to 85V, making it suitable for accurate power analysis in embedded systems, robotics, and industrial electronics.

Key Features

• High or low side current and voltage measurement

• 20-bit ADC for high-resolution readings

• Measures bus voltage, current, and calculated power

• Wide common-mode voltage range up to 85V DC

• Integrated precision shunt resistor

• I2C communication interface

• STEMMA QT / Qwiic connector available and compatible

• Adafruit library compatible

Technical Specifications

• IC Model: INA228

• Measurement Type: Current, voltage, and power monitoring

• Measurement Method: High-side or low-side sensing

• Bus Voltage Range: 0 to +85V DC

• ADC Resolution: 20-bit

• Shunt Resistor: 15 mΩ, 0.1 percent tolerance (onboard)

• Current Measurement Capability:

  • Up to approximately 10A continuous (high current mode)

  • Up to approximately 2.75A continuous (low current mode)

• Current Resolution:

  • 10 µA per LSB (high current mode)

  • 2.5 µA per LSB (low current mode)

• Communication Interface: I2C

• Logic Level Compatibility: 3.3V or 5V

• Supported Voltage Type: DC only (not for AC use)

Applications / Use Cases

• Power monitoring in embedded systems

• Battery and power supply testing

• Robotics and motor control systems

• Energy usage measurement

• Industrial and laboratory instrumentation

• Educational and development projects

Package Includes

• 1 x INA228 power monitor breakout module

• 1 x 3.5 mm terminal block

• 1 x Pin header

Notes / Warnings

• Designed for DC voltage measurements only

• Ensure correct wiring for high-side or low-side measurement

• Observe maximum voltage and current limits

• Some soldering may be required for header installation

• QT cable not included

The INA228 power monitoring module provides a flexible and highly accurate solution for measuring current, voltage, and power in demanding DC applications. With its wide voltage range, fine resolution, and STEMMA QT / Qwiic compatibility, it is well suited for advanced power measurement and analysis tasks.