At 07:31 AM 2/27/2004 -0800, you wrote:
>I have a design where I am using a Micrel MIC94053 (internal pup) to switch
>5V.  I am driving this from portB:2, and it doesnt seem to want to drive it
>low enough (best way to describe it I suppose).  In that if I tie the gate
>to ground, the circuit works fine.  If I drive from Port D, it works fine.
>I have the bit set low in the PORT reg, and use the TRIS to enable/disable
>it.  I've verified that when I do this, it does go tristate and does goto a
>logic level low (0 V on the meter) but it can't seem to force the FET to
>turn off.

The FET (a p-channel type) is *supposed* to be on with 0V on the gate.

Maybe you've got it hooked up wrong so the PIC is attempting to sink the
load current through the gate diode. Just a thought.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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