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The CJMCU-219 INA219 I2C Bi-Directional Current and Power Monitoring Module is an advanced, software-programmable data acquisition board engineered to provide precise power telemetry for embedded systems. While older analog shunt amplifiers suffer from significant thermal calibration drift and struggle with high-side sensing, the Texas Instruments INA219 core handles everything digitally. It safely measures high-side currents—where the sensing resistor sits between the power source and the load—preventing ground-loop disruptions across your project circuits.

The board comes populated with a high-precision, low-profile 0.1Ω, 1% 2W current sense shunt resistor. The internal 12-bit Analog-to-Digital Converter (ADC) monitors the tiny voltage drop across this shunt (up to ±320mV), enabling it to compute currents up to ±3.2 Amps with an impressive 0.8mA resolution. For advanced hardware developers, swapping out this stock shunt resistor allows you to easily recalibrate the board's dynamic range (for instance, using a 0.01Ω resistor scales the module up to a massive 32 Amp tracking range).

Key Features & Benefits:

• Comprehensive Power Metrics: Tracks the shunt voltage drop, measures the overall bus supply voltage, and instantly calculates real-time power consumption in Watts via internal hardware registers.

• Smart Digital Filtering: Features a programmable averaging engine that can smooth up to 128 samples concurrently, filtering out high-frequency electrical noise in switching motor or radio environments.

• High-Speed I2C/SMBus Connectivity: Communicates over a standard 2-wire serial bus with a built-in bus timeout guard to prevent master lockups, supporting high-speed modes up to 3.4 MHz.

• True Zero-Drift Precision: Maintains less than a 1% absolute accuracy error margin and a maximum offset of just 100µV across its entire -40°C to +85°C industrial temperature envelope.

Technical Specifications