I have several of theses, and one of them, when hooked to a 5.0vcc has .36v as its zero current output voltage. All the other ones have something close to .5v as expected. The datasheet says that “The device is fully calibrated prior to shipment from the factory” but it doesn’t look like there is a way to recalibrate it. Temperature should not be an issue. With a load, the 133 mV/A specification seems to be holding up.
My application will never have a zero load condition, so I can’t dynamically calibrate it via software.
Any suggestions?