STEMMA QT INA238 DC Current Voltage Power Monitor - INA238 power monitoring module

Description

INA238 DC Current Voltage Power Monitor is an advanced power monitoring IC that supports a wide range of voltages and currents. The device can measure current and voltage on both high-side and low-side with a precise 16-bit ADC, allowing accurate measurements from milliamps to amps. With the I2C interface, configuring alarms, oversampling, and gain is straightforward. The INA238 can measure currents up to 10 A or 2.75 A and voltages up to 85 V DC, while also automatically calculating power. Compared to the INA228, it offers 16-bit resolution, ±0.1% gain error, and a maximum voltage offset of ±5 µV.

The device is compatible with microcontrollers using Arduino and CircuitPython, as well as single-board computers like Raspberry Pi. It operates with 3 V or 5 V logic and can measure bus voltages up to 85 VDC, but it is not intended for AC voltages. The built-in 15 milliohm (0.015Ω) shunt resistor enables accurate current measurements on both high-side and low-side, with 0.15 mA/LSB resolution in high-current mode and 42 µA/LSB in low-current mode. High-side measurement is simplified with a factory-connected jumper from V+ to VBUS.

The module requires 3–5 VDC power and uses two I2C pins for communication. Up to four sensors can be connected on a single I2C bus using address jumpers. Additionally, the STEMMA QT connector allows easy plug-and-play installation without soldering the power and I2C lines. The INA238 offers a fast alarm response time of 75 μs and operates over a wide temperature range from -40°C to +125°C, providing power measurement accuracy better than 1%. This makes it a comprehensive solution for current, voltage, and power monitoring in electronic projects with high precision and ease of use.

Features

• Bus voltage range: 0 V to +85 VDC
• Maximum current: 10 A or 2.75 A
• 16-bit ADC
• Gain error: ±0.1%
• Voltage offset: ±5 µV (max)
• Offset drift: ±0.02 µV/°C
• Gain error drift: ±25 ppm/°C
• Shunt differential range: ±163.84 mV / ±40.96 mV
• Temperature sensor: ±1°C (at 25°C)
• Fast alarm response: 75 μs
• Programmable conversion and averaging time
• Compatible with Arduino, CircuitPython, and Raspberry Pi
• STEMMA QT connector with I2C interface
• Dimensions: 25.4 × 20.3 mm

Kit contains

• Adafruit INA238 DC Current Voltage Power Monitor module
• Goldpin connector