I am using an INA226 in a low side sensing application. The bus working voltage could be up to 120V with an absolute max of 125V. I am looking at using a 150k/68k voltage divider to work with the internal 830k pulldown and drop the voltage to 36V. I am ok with using a crowbar circuit to blow a fuse on an overvoltage condition. However I would like the device to recover from reverse polarity without any fuses blowing.
Would the high input impedance of the voltage divider protect the chip from -120V (-36V on pin, although maybe there is an internal clamp)? Or do you have any other suggestions for how best to protect the chip without any loss in accuracy? I will be calibrating the devices so I only care about relative accuracy. But I would prefer to have a high gain accuracy and low tempco.