INA220 Bi-Directional Current / Power Monitor The Texas Instruments INA220 bi-directional current shunt and power monitor with two-wire interface monitors shunt drop and supply voltage and features high- or low-side sensing. The INA220 bi-directional current / power monitor senses bus voltages from 0V to +26V and reports current, voltage, and power. The TI INA220 is designed for use with a variety of applications, including servers, telecom equipment, notebook computers, power management, battery chargers, automotive, power supplies, and test equipment.