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 INA232 device is a 16-bit digital current monitor with an I²C- or SMBus-compatible interface that is compliant with a wide range of voltages such as 1.2 V, 1.8 V, 3.3 V, and 5.0 V. The device monitors the voltage across an external sense resistor and reports values for current, bus voltage, and power. The INA232 senses current on common-mode bus voltages that can vary from –0.3 V to 48 V, independent of the supply voltage. The device operates from a single 1.7-V to 5.5-V supply, drawing a typical supply current of 300 μA in normal operation. The device can be placed in a low-power standby mode where the typical operating current is 2.2 μA.

Figure 1-2 compares some of the key electrical specifications of INA219 and INA232