Do you have a spare pin you could use to drive a PFET or transistor on your
fussy chip's power rail?
Then you would be able to reset the device at will (assuming that you set
all other pins connected
to it to low).
You say you need 100mA which is too much for a PIC pin, but I have used PIC
pins to directly switchable power
to low current drain devices. With a series inductor and small cap to
filter out noise you get a decent
switchable power line.
--=20
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