LamaPLC: CJMCU-219/INA-219 breakout board/IC with I²C communication

The CJMCU-219 is a breakout board featuring the INA219 IC, a zero-drift, bidirectional current and power monitor with an I²C interface.

Core Technical Specifications

Voltage Measurement: Can detect bus voltages from 0V to +26V DC. Current Range: Measures up to ±3.2A bidirectionally using its built-in 0.1 ohm shunt resistor. Supply Voltage: Operates on +3.0V to +5.5V. Precision: Features a 12-bit ADC with a maximum error accuracy of 1% over -40°C to +85°C. Interface: Uses I²C communication (standard 100kHz or high-speed 400kHz/3.4MHz) with a default address of 0x40.

Key Features

• High-Side Sensing: Unlike many sensors, it can measure current on the high side (between the power source and the load), thereby avoiding ground-reference issues.
• Multi-Function Reporting: It calculates and reports bus voltage, shunt voltage drop, current, and total power (W) directly.
• Programmability: Supports software-programmable calibration, filtering (averaging up to 128 samples), and conversion times.
• Daisy-Chaining: Supports up to 16 programmable I2C addresses, allowing multiple modules to run on the same bus.

Safety & Limitations

• Voltage Limit: The chip may be damaged if bus voltage exceeds its absolute hardware limit of 26V.
• Inductive Loads: Users should be cautious with large motors, as “flyback” voltage spikes can exceed the 26V threshold and destroy the sensor.

• SCL: A5
• GND: GND
• SDA: A4
• Vdd: 5V

sample

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