Have you considered a resiter and zener diode? Say a 5.1V one. That way you
get the best of both worlds, the zener keeps the voltage at 5.1V as long as
the input is about 5.1V, if it drops then the Zener does nothing and your
PIC will continue to function until the voltage is to low for it. TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Giles Honeycutt
> Sent: Friday, August 24, 2001 08:24
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC] 2 X 3VDC bat with PIC
>
>
> Dan,
> I did not want to use a Low Dropout regulator due to the loss of
> voltage.  I
> have not looked in a couple of years, but I think the best on the market
> still takes away 1.1 VDC.  I may go to a regulator in the future,
> as someone
> may want to "hotwire" the product with a 9V battery.
> I am continuing with a diode in series of the PIC's power supply.  Filter
> cap is on the PIC side of the diode.
> Best regards,
> Giles
>
> >
> >Giles, if 6v is critical, you can go with the older PICs - pre-flash,
> >as they handle a wider Vcc range. I am assuming you are not using
> >an LDO regulator in the ckt, but rather running directly off your
> >battery. Personally, I think I would go with a regulator.
> >
> >- dan
>
>
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