Re: PIC at dry ice temperature

On Mon, 29 Aug 2005 21:54:22 +0200, Rene Tschaggelar <none@xxxxxxxx>
wrote:

>scott.manton@xxxxxxxxx wrote:
I've used it down
>> to -40 without problems, but when asked to ship it in dry ice it did
>> not work. The ram would clear for whatever reason.
>
>I wouldn't be surprised if the battery was frozen
>and didn't deliver any current at all.

I would agree that the problem here is most likely in the
battery. Temporary power loss would clear the RAM.
You might go over the manufacturers specs on the battery. You
might also look at supercapacitors instead of batteries if you find
one that can operate at those temperatures. I have read that they can
be used at low temperatures, but I do not recall specific specs.
.

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