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.
