Re: Ultra low temperature microcontroller ?


"Everett M. Greene" <mojaveg@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:20070712.79D3A60.ABA3@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Paul Burke <paul@xxxxxxxxxx> writes:
Morten M Jørgensen wrote:
We are having a hard time finding a suitable microcontroller for our
new
automotive project. The product will have to operate in a very harsh
enviroment including temperatures lower than -40 deg. C.

Put the microcontoller between the driver's thighs. If it drops below
-40 there, nobody's going anywhere.

A little more seriously, can anyone give a simple explanation as to
why low temperatures are a problem for solid-state electronics? Do
the eletrons freeze?

When I talked to a Microchip Rep about using their chips for operating down
to -76 deg C they said that one of the problems is differential
expantion/contraction between the die and the package. At that temperature
the die often will crack.

Don


.

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