SLYS021A January 2021 – May 2022 INA228
Connect the input pins (IN+ and IN–) to the sensing resistor using a Kelvin connection or a 4-wire connection. This connection technique ensures that only the current-sensing resistor impedance is sensed between the input pins. Poor routing of the current-sensing resistor commonly results in additional resistance present between the input pins. Given the very low ohmic value of the current-sensing resistor, any additional high-current carrying impedance causes significant measurement errors. Place the power-supply bypass capacitor as close as possible to the supply and ground pins.