What is this?
The CJMCU-219 module is a zero-drift, bidirectional current/power monitoring integrated circuit (IC) with an I2C interface, which strengthens TI's energy-saving electronic product camp. With high accuracy and minimal size, the INA219 can not only monitor the voltage drop across the shunt resistor, sense the shunt supply voltage, but also calculate the power supply. It is widely used in servers, notebooks, power supplies, battery management, and automotive and telecommunications equipment

What will I get?
Interface zero-drift bidirectional current/power monitoring sensor module
The device can sense the bus voltage range from 0 V to +26 V
Powered by a single power supply, the operating voltage is +3.0V ~ +5.5V.
INA219 can achieve a maximum error accuracy of 1% within -40°C ~ +85°C, and a maximum offset of 100uV.
Footprint: SOT23
Size: 25mm x 22mm/0.98 x 0.87 inch(L*W)
Package Contains :4Set x Bidirectional DC Current Power Sensor

Are there any advantages of the product?
The I2C interface has a time out setting to avoid bus lock and provides a high-speed mode for communication requirements up to 3.4 MHz.
Up to 128 samples can be averaged to achieve filtering in noisy environments.
The high accuracy combined with the advantages of 12-bit resolution can help customers reduce the voltage drop across the shunt resistor, thereby reducing power loss and power consumption, saving board space.

How to use it?
The DC current monitor is packaged in a SOT23 package, and the programmable calibration register can directly read the current in amps and the power in watts.

What should I notice?
Ensure that the INA219 is provided with the appropriate supply voltage to ensure its normal operation