Ben Jackson wrote:

> After several passes at about room temperature and 'fridge temperature'
> (around 40F, 4C) I tried it in the freezer (around 0F, -18C) and
> consistently the programming loop failed to write (left at 0xFF) the
> first EEPROM byte.


Hi Ben,

It's not too clear what you are actually putting inside the freezer besides
the PIC -- is this a complete PCB board or a perf-board project?
If so, is the board conformally coated? Perhaps it is related to humidity
and condensation on the board?

I'm thinking you are using a environmental chamber, but you mentioned
'freezer' -- is this a food freezer?

Also, if you are using a crystal or ceramic resonator, are you operating in
the manufacturer's recommended temperature range of the crystal or
resonator?

Regards,

Ken Pergola

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