You are using the P-FET as a power switch, turning +5volts ON and OFF? The
source lead of the FET is tied to +5V and the drain is driving your load?
The gate of the FET is pulled to +5V by a resistor, and you are connecting the
Gate/resistor point to a PortB pin and trying to turn the FET ON by pulling
that PortB pin LOW? Correct?

What is the pull-up resistor value? What does the gate voltage drop to when you
set that bit low?

It is hard to see why the FET wouldn't turn ON even if the gate doesn't get all
the way to 0.0Volts - 3 volts swing on the gate should do the job.


Roy J. Gromlich



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