SparkFun Current Sensor – INA228 (Qwiic)

Resources:

Schematic
KiCad Files
Board Dimensions
Hookup Guide
Datasheet (INA228)
SparkFun INA2XX Arduino Library
GitHub Repository

20-Bit INA228 Qwiic Current and Power Sensor with Energy and Charge Monitoring
The SparkFun INA228 Qwiic Current Sensor is a high-precision DC and power-monitoring breakout based on the Texas Instruments INA228 digital power monitor. Its integrated 20-bit delta-sigma ADC measures current, bus voltage, power, and internal temperature while also tracking accumulated energy and charge. The sensor communicates over I2C, making it suitable for battery systems, power supplies, embedded electronics, and applications requiring detailed real-time power analysis.
The breakout includes a pre-installed 15 mOhm shunt resistor, a 3-pin screw terminal, and 2x Qwiic connectors for convenient solderless integration. A 0.1-inch spaced plated through-hole header provides access to power, SDA, SCL, and the multi-purpose alert output, while additional through-hole connections allow a custom shunt resistor to be used when required. With 0.5% full-scale power accuracy, 1.0% full-scale energy and charge accuracy, up to 154 dB common-mode rejection, and operation from -40 C to +125 C, the INA228 is well-suited for precision power-monitoring applications.
Key Features

20-Bit ADC: Integrated 20-bit delta-sigma ADC provides high-resolution electrical measurements.
Multi-Parameter Monitoring: Measures current, bus voltage, power, and internal temperature.
Energy Measurement: Tracks accumulated energy directly within the INA228.
Charge Accumulation: Measures accumulated charge for battery and energy-monitoring applications.
15 mOhm Shunt Resistor: Includes a pre-installed 15 mOhm current-sense resistor for immediate integration.
Custom Shunt Support: Through-hole connections allow installation of an application-specific external shunt resistor.
I2C Communication: Provides digital measurement data through an I2C interface.
Qwiic Connectivity: Includes 2x Qwiic connectors for solderless integration with compatible controllers and peripherals.
Screw-Terminal Interface: 3-pin screw terminal provides a convenient connection for the monitored DC power path.
Through-Hole Connections: 0.1-inch spaced plated through-holes provide access to power, SDA, SCL and alert signals.
Power Accuracy: Provides 0.5% full-scale power-monitoring accuracy.
Energy and Charge Accuracy: Provides 1.0% full-scale accuracy for accumulated energy and charge measurements.
Common-Mode Rejection: Supports up to 154 dB common-mode rejection for stable measurements in electrically demanding systems.
Programmable Alerts: Supports threshold-based alerts for voltage, current, power and temperature conditions.
Fast Alert Response: Provides an alert response time of approximately 75 us.
Conversion-Ready Indication: Alert output can signal when a measurement conversion has completed.
Open-Drain Alert Output: Multi-purpose digital output supports event-driven monitoring and threshold detection.
Wide Temperature Range: Operates from -40 C to +125 C for use across demanding thermal environments.
Processor Offloading: Built-in monitoring and alert functions can reduce continuous processing requirements on the host microcontroller.

Specifications:
INA228 Features

20-Bit Delta-Sigma ADC
Current Monitoring Accuracy:

Offset Voltage: uV (max)
Offset Drift: 0.01 uV/C (max)
Gain Error: 0.05% (max)
Gain Error Drift: 20 ppm/C (max)
Common Mode Rejection: 154 dB (max)

Power Monitoring Accuracy: 0.5% full scale, -40C to +125C (max)
Energy and Charge Accuracy: 1.0% full scale (max)
Alert Response Time: 75 uS
Common-Mode Range: -0.3 V to +85 V
Bus Voltage Sense Input: 0 V to 85 V
Shunt Full-Scale Differential Range: 163.84 mV / 40.96 mV
2.94MHz High-Speed I2C Interface

4 Available I2CAddresses (Selected by solder jumpers)
Default Address: 0x40

Supply Voltage: 2.7 V to 5.5V

Operational Current: 640 uA
Shutdown Current: 5 uA

Qwiic Breakout Features

2x Qwiic Connectors
1x 3-Pin Screw Terminal

Max Power Rating: 85V/10A
IN Shunt Resistor: 10m (Default)
Optional external shunt resistor connections
VBUS isolated from IN by default

0.1″-spaced Through Hole Header

Power (VCC/GND), I2C (SDA/SCL) and Alert

Red Power LED

Applications

Precision DC monitoring
Power-consumption measurement
Battery energy monitoring
Charge tracking systems
Power-supply analysis
Embedded power management
IoT power monitoring
Robotics and automation systems
Industrial electronics
Test and measurement equipment
Energy-monitoring systems
Battery-powered devices
Over-current and over-voltage monitoring
High-precision development projects
Low-power microcontroller systems

Dimension