Texas Instruments INA219

the ina219 is a high-side current shunt and power monitor with an i2c interface. the ina219 monitors both shunt drop and supply voltage with programmable conversion times and filtering. a programmable calibration value combined with an internal multiplier enables direct readouts in amperes. an additional multiplying register calculates power in watts. the i2c 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 0v to 26v. the device uses a single +3v to +5.5v supply drawing a maximum of 1ma of supply current. the ina219 operates from 40c to +125c.