On Fri, Oct 11, 2013 at 3:53 AM, shawn mulligan
<mulliganspiclist@gmail.com> wrote:
> Can anyone offer their personal experiences when dealing  with PIC
> microcontrollers in high-temperature applications -- say, > 170C...
> Outside of the stated ranges.
>
> Specifically, is there a particular device that works for you? Do you
> consider thermal resistance in your design? Heat-sinking? PCB?

I do not know anything about this. But there are specialized
product which work at high temperature.

http://www.halliburton.com/en-US/ps/sperry/drilling/measurement-while-drill=
ing-mwd.page?node-id=3Dhfyjrqum
"Quasar PulseSM MWD/LWD Service

Extend the reach of current MWD/LWD sensors rated to temperatures
of 175=B0C (347=B0F) to 200=B0C (392=B0F), providing reliable directional d=
ata and
 steering capabilities in the most extreme downhole environments."

I heard that they use expensive components (eg: OpAMP, ADC, MCU,
DSP). On the other hand, the life span of some of the above product
will be quite short (< 1 hour).

--=20
Xiaofan

--=20
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