I am interested in steady state idle current (or lack of current) measurement for fault detection. Also, for active current measurement I need to know the offset that corresponds to idle (i.e. zero current). VPROPI signal seems to drift up after power up for ~1hour while driver is idling; the drift before setting is ~170mV, which quite significant in terms of current measurement in our application. The test environment is thermally stable.
Is the drift a normal behavior? Is it possible/meaningful to use VPOPI output of the driver to detect idle current, i.e.winding current when ENABLE pin is low?
Thank you,
Raphael