Why not use the TI TL7757C Voltage Supervisor to reset the pic when
the voltage drops below 4,5V. I use it in the same kind of application
as yours with lots of uF's in it. Never had any problems.

Daniel..

>At 04:50 PM 2/6/99 -0800, you wrote:
>>Hello all,
>>I have a circuit (it contains a pic) which has a couple of rather
large
>>aluminum electrolytic capacitors (2200uF) as supply filters. the
problem
>>is that when the circuit is turned off, the charge takes a little
while to
>>dissipate (i have a power on led in series with a 1K resistor across
the
>>supply lines) and while its dissipating, the pic among other things
is
>>still funtioning. I am worred that the pic might end up in one of my
>>routines which, for example writes to an I2C EEPROM, and corrupt the
data
>>there. so what i need is a way to disipate the capacitor reletively
>>quickly after power down. I was thinking of putting a diode in
paralel in
>>the wrong direction (anode to gnd, cathode to vcc) but i dont think
this
>>will work, since the charge in the capacitor is polarized. I hope
someone
>>has an idea.. thanks agian
>>
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>>A member of the PI-100 Club:
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>|
>| Sean Breheny
>| Amateur Radio Callsign: KA3YXM
>| Electrical Engineering Student
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