Hello, I've got a circuit where a uC is monitoring for a loss in input (5V wall DC adapter). I have a large capacitor involved so the circuit can stay powered for a brief time when input power is lost and perform a few functions. I have the circuit working fine with a schottky and the uC input tied in behind the schottky so that the capacitor doesn't backfeed power to the uC sense pin when power is lost. The issue is the forward voltage drop of the schottky is affecting load stability (need as close to 5V as possible and the 0.34v loss of the current diode is too much). Does anyone know of a way for the uC to sense a loss of power without the capacitor backfeeding to the pin? I've attached a basic schematic of what I have going on here.
Thanks for any help!
Thanks for any help!