INA219 I2C High Side DC Current and Power Monitor No Drift Bi-Directional Sensor Module

Product Description The INA219 is a high-side, bi-directional current shunt and power monitor module with an I2C interface. Unlike simple analog current sensors, the INA219 handles both current and voltage measurements digitally, calculating power consumption internally. This module measures the voltage drop across a 0.1-ohm shunt resistor and can monitor bus voltages from 0V up to 26V. Its digital nature ensures "no-drift" performance, making it highly accurate for battery charging cycles, solar panel monitoring, and power management in IoT devices. It integrates seamlessly with Arduino, ESP32, and Raspberry Pi, providing precise data without requiring the host microcontroller to perform complex analog-to-digital conversions.

Key Features

• Digital I2C Output: Provides bus voltage, shunt voltage, and calculated power directly over the I2C bus, reducing MCU processing load.

• High-Side Sensing: Measures current on the positive rail (up to 26V), allowing the load's ground to remain undisturbed.

• Bi-Directional Monitoring: Capable of measuring current flow in both directions, ideal for battery charge and discharge tracking.

• Selectable Gain: Features an internal programmable gain amplifier (PGA) to adjust the measurement range and resolution.

• Integrated Math Engine: Automatically calculates power in Watts and current in Amperes based on user-configured calibration registers.

Technical Details

• Sensing Architecture: Combines a high-precision 12-bit ADC with an I2C-compatible interface for robust data transmission.

• Voltage Monitoring: Capable of reporting bus voltages from 0V to 26V with high resolution, independent of the module's supply voltage.

• Shunt Resistor Quality: Utilizes a high-stability 0.1 Ohm (R100) precision resistor for low thermal noise and consistent readings.

• Address Configuration: Features two address pins (A0, A1) allowing up to 16 different INA219 modules to be used on a single I2C bus.

• Current Resolution: Default configuration allows for a resolution of 0.8mA; can be fine-tuned via software for higher precision at lower ranges.

• Supply Voltage Compatibility: The module logic can be powered by any 3V to 5.5V DC source, matching both 3.3V and 5V logic levels.

• Sampling Modes: Supports triggered or continuous sampling modes with internal averaging to filter out electrical noise.

• Operating Current: Draws an extremely low quiescent current of approximately 1mA, dropping to 6µA in power-down mode.

• Differential Input: Measures shunt voltages up to ±320mV across the resistor for precise current mapping.

• Hardware Interface: Standard 6-pin header for logic (VCC, GND, SDA, SCL) and a high-current 2-pin screw terminal for the load.

• Data Integrity: I2C interface supports speeds up to 3.4MHz (High-Speed Mode) with reliable data packet handling.

• Temperature Stability: Engineered to maintain accuracy across an industrial temperature range of -40°C to +125°C.

• Filtering Logic: Built-in programmable conversion times and averaging for both bus and shunt voltage measurements.

• PCB Construction: Industrial-grade FR-4 PCB with thick copper traces to safely handle currents up to 3.2A.

• Compact Design: Small footprint makes it suitable for integration into portable power banks and smart battery enclosures.