1 Features

1• Senses Bus Voltages from 0 to 26 V

• Reports Current, Voltage, and Power

• 16 Programmable Addresses

• High Accuracy: 0.5% (Maximum) Over

Temperature (INA219B)

• Filtering Options

• Calibration Registers

• SOT23-8 and SOIC-8 Packages

2 Applications

• Servers

• Telecom Equipment

• Notebook Computers

• Power Management

• Battery Chargers

• Welding Equipment

• Power Supplies

• Test Equipment

3 Description

The INA219 is a current shunt and power monitor

with an I2C- or SMBUS-compatible interface. The device monitors both shunt voltage drop and bus

supply voltage, with programmable conversion times

and filtering. A programmable calibration value,

combined with an internal multiplier, enables direct

readouts of current in amperes. An additional multiplying register calculates power in watts. The

I2C- or SMBUS-compatible interface features 16

programmable addresses.

The INA219 is available in two grades: A and B. The

B grade version has higher accuracy and higher

precision specifications.

The INA219 senses across shunts on buses that can

vary from 0 to 26 V. The device uses a single 3- to

5.5-V supply, drawing a maximum of 1 mA of supply current. The INA219 operates from –40°C to 125°C.