INA219AID datasheet | connection & current sensor

INA219 Pinout

INA219 Pinout Picture

INA219 is a zero-drift bi-directional current monitoring chip with IIC interface (zero-drift: roughly means that it is very accurate, there will be no current drift); the monitoring port can withstand a voltage of 0 to 26V is a very wide range of operating voltages; with 16 programmable addresses, you can read or control the chip through the IIC; high precision, in the appropriate operating temperature range of the accuracy of the accurate to 0.5%; the package is SOT23-8 or SOIC-8 two package form; mainly used in, rechargeable batteries, chargers and other devices. High precision, within the appropriate operating temperature range, the accuracy can be accurate to 0.5%; the package is SOT23-8 or SOIC-8 two package forms; mainly used in, rechargeable treasure, chargers and other equipment.
The specific pin definitions are as follows:

INA219 Circuit

ina219 Picture

The INA219 is a commonly used high-precision current, voltage and power detection chip from Texas Instruments. It is widely used in battery charging and discharging circuits, mobile phone chargers, solar chargers and various electronic circuits that require accurate detection of current, voltage and power parameters. INA219 can communicate with the microcontroller through the IIC communication protocol, and we can use the microcontroller to send instructions to INA219 to obtain various information collected by it. Next, we will introduce the detailed parameters of INA219 and the reference design of the circuit.
Basic parameters of INA219:
Bus voltage range: 0~26V ‘
Current measurement range: according to the peripheral resistance configuration to determine (maximum support 3.2A);
Power measurement range: calculated from the measured value of voltage and current;
Measurement accuracy: the maximum error is 0.5%;
INA219 circuit diagram design;

INA219 circuit diagram

As shown in the figure, the chip requires very few peripheral circuits to work; First look at pins 1 and 2 are the address of the device; The microcontroller uses this address (00,01,10,11) to identify which slave device it is. The 3、4 pins are SDA and SCL pins respectively used to communicate with the MCU. Theoretically, a 4.7K pull-up resistor is required here, but considering that most MCU GPIO has its own pull-up resistor; The other pins are clearly visible from the circuit; 7、8 is the input pin of the device to be tested, 6 is GND, and 5 is the chip power supply port, which is connected after a capacitor filter. R2 is used to collect the resistance, the official manual is used in 0.01 ohms, in actual use can be selected according to the need to collect the range of parameters.