In my experience with running uPs cold, the problem is that the port pin
drive goes out of spec, then the oscillator stops (or won't start).  If
you lightly load the ports, and use an external oscillator or a crystal
brand you trust, you may be able to bend the rules significantly.  I
have never used the 16F628 so you will have to run tests yourself.

Sherpa Doug

> -----Original Message-----
> From: Gary [mailto:questuk1@HOTMAIL.COM]
> Sent: Tuesday, March 19, 2002 2:19 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Can standard 16F628 operate below 0 centigrade?
>
>
> Hi,
>
> PIC16F628-04/P running at 4Mhz @ 3V
>
>
> I have designed a project using the PIC16F628-04/P, microchip
> states that the operating temperature is 0c to +70c, how low
> have you run this chip at successfully.
>
> I realise you can get different versions for lower
> temperatures, but I am interested how close you have to be to
> the tolerance in the book?
>
> This is going into a commercial device, so I assume we may
> well have to go for the 'lower temperature version' ?
>
> Any idea on the difference in price between PIC16F628-04/P,
> PIC16F628-04I/P, PIC16F628-04E/P versions.
>
>
> Thanks Gary
>
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