On Wed, 20 Mar 2002, Peter L. Peres wrote:

>
> I've tested several PICs down to (unmeasured, theoretical) -55C
> (electronic freeze spray until it pools on part) with no bad effects. I
> did not see any one of them 'stop', until condensation reached the osc
> pins. The PICs were 16F84 (not A) and 16C54 CERDIP (not A). I also froze
> 12C508A OTPs on internal RC clock but their clock deviation prevented the
> circuit from working a long time before -55C was reached (for causes other
> than cold - the timing went bad). I did not test oscillator startup when
> cold on any of these parts, but I know that there will be problems with
> that. The circuits were started at room temperature and then heated and
> frozen alternately a few times.
>
  Could you tell us what's happening between +5...+10C ( long time
test ) after a frozing cycle ? How the humidity influenced your measurements ?
Thanks, Vasile

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