Operational Voltage (3 – 5.5 Volts): The INA219 operates between 3 to 5.5 volts, increasing its compatibility with various systems running at either 3.3V or 5V logic level. This feature enhances the module’s flexibility in diverse circuit designs.

Bus Voltage Range (0 – 26 Volts): The INA219 can monitor power supplies within 0 to 26 volts range. This broad range makes the module applicable to low-voltage logic circuits and higher-voltage power supplies.

Current Sensing Range (±3.2A with ±0.8mA resolution): The INA219 can monitor a current range of ±3.2A with a precise resolution of ±0.8mA. This capacity makes it suitable for various applications including power management, battery chargers, and DC motor control, enabling accurate tracking and control of power consumption.

0.1 ohm 1% 2W Current Sense Resistor: The module uses a 0.1-ohm shunt resistor with a 1% tolerance and 2W power rating for current sensing. The low resistance value minimizes power loss, while the 1% tolerance ensures measurement accuracy. The 2W power rating indicates its robustness, supporting current measurements up to ±3.2A.

VCC this pin is used to supply the operating voltage to the INA219 module. It can handle an input voltage of 3.3V to 5.5V.

GND this is the Ground pin.

SCL this pin is used for the clock line of the I2C interface.

SDA this pin is used for the data line of the I2C interface.

Vin- this pin connects to the negative terminal of the voltage supply that you want to measure. This pin is also where the shunt resistor is placed and is used for current sensing.

Vin+ this pin connects to the positive terminal of the voltage supply that you want to measure.

Adafruit INA219

INA219 Zerø-Drift, Bidirectional Current/Power Monitor With I2C Interface - Texas Instruments [EN]