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PICList Thread
'Extreme cold temperature'
1996\11\11@144000 by Paul Bjork

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Anyone have any experience running a pic down to -60 degrees C?  I
tried a simple experiment with an externally clock driven PIC16c73
running a PWM output, all by itself. My can of envirotech chiller
spray, which says -62 F, killed the PWM output and so, I presume, the
whole chip.  I haven't yet characterized it accurately below -40 C.

I need a PWM output and a UART, although I could easily emulate them.
Also an ADC would be nice but not necessary at that temperature.

Is there a temperature range for any Microchip controller below -40 C?
It would seem that some of the lads driving cars in Iceland would
appreciate them.

1996\11\11@150456 by Wireless Scientific

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At 8:43 AM 11/11/96, Paul Bjork wrote:
>Anyone have any experience running a pic down to -60 degrees C?  I
>tried a simple experiment with an externally clock driven PIC16c73
>running a PWM output, all by itself. My can of envirotech chiller
>spray, which says -62 F, killed the PWM output and so, I presume, the
>whole chip.  I haven't yet characterized it accurately below -40 C.
>
>I need a PWM output and a UART, although I could easily emulate them.
>Also an ADC would be nice but not necessary at that temperature.
>
>Is there a temperature range for any Microchip controller below -40 C?
>It would seem that some of the lads driving cars in Iceland would
>appreciate them.


if you can spare the power, add a heater. There are several companies that
sell little heater elements (basically resistors) about the size of large
postage stamps that run on AC or DC.

craig




________________________________________________________
Dr. Craig Hollabaugh
Wireless Scientific, Inc.
1890 South 14th Street
Building 100, Suite 105
Amelia Island, FL 32034
904 261 6977
904 261 2129 fax
spam_OUTwsciTakeThisOuTspamnet-magic.net

Or you might know me as
Dr. Craig Hollabaugh
Analog Microelectronics, Georgia Institute of Technology
.....hollaKILLspamspam@spam@monique.adgrp.gatech.edu

or

Dr. Craig Hollabaugh
Aerospace Department, University of Texas, Austin
hollaspamKILLspamcfdlab.ae.utexas.edu

1996\11\11@155939 by optoeng

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Paul Bjork wrote:
>
> Anyone have any experience running a pic down to -60 degrees C?  I
> tried a simple experiment with an externally clock driven PIC16c73
> running a PWM output, all by itself. My can of envirotech chiller
> spray, which says -62 F, killed the PWM output and so, I presume, the
> whole chip.  I haven't yet characterized it accurately below -40 C.
>
> I need a PWM output and a UART, although I could easily emulate them.
> Also an ADC would be nice but not necessary at that temperature.
>
> Is there a temperature range for any Microchip controller below -40 C?
> It would seem that some of the lads driving cars in Iceland would
> appreciate them.


What usually happens with freeze mist is the consequent condensation
causes significant leakage currents.......you need low humidity air to
properly perform such a test.

There are a variety of materials incompatibility issues that become
serious problems below -40C, so regardless of electronic performance, I
agree with suggestion to include a heater.  The high positive tempco
polymeric types are particularly easy to apply.
--

Paul Mathews, consulting engineer
AEngineering Co.
.....optoengKILLspamspam.....whidbey.com
non-contact sensing and optoelectronics specialists

1996\11\12@111149 by Jon Bertrand

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    IMHO  :)

    The freeze-spray is a little misleading - condensation is a problem
    for sure - also the thrermal gradient is so large you will crack the
    die or pop wire bonds.  If you cool the part slowly it may work.  If
    you cool it quickly it'll crack.


    Jon Bertrand
    EraseMEjonbspam_OUTspamTakeThisOuTcirris.com

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