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'[PIC] [EE] Internal RC sensitive to PCB flex?'
2017\11\02@170141 by Van Horn, David

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Is there any documentation on sensitivity to PCB flex when using the internal RC?
I have seen this on SAM7 chips and I think it's happening on a 24F chip.

--
David VanHorn
Lead Hardware Engineer

Backcountry Access, Inc.
2820 Wilderness Pl, Unit H
Boulder, CO  80301 USA
phone: 303-417-1345  x110
email: spam_OUTdavid.vanhornTakeThisOuTspambackcountryaccess.com<.....david.vanhornKILLspamspam@spam@backcountryaccess.com>

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2017\11\02@184715 by Sean Breheny

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I don't know about documentation but I have seen this before but I cannot
remember whether it was with a 16F88 or dsPIC24. I noticed it only when I
applied pressure directly to the package of the chip, though. I would
suspect that anything which applies pressure to the die will change the
value of resistors and capacitors on the die.



On Thu, Nov 2, 2017 at 5:01 PM, Van Horn, David <
david.vanhornspamKILLspambackcountryaccess.com> wrote:

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2017\11\03@111427 by Van Horn, David

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I verified yesterday that it is happening, and that it's not just temperature.  On external crystal a pin toggle based on a timer is dead constant.  On internal RC, applying torque to the board wobbles the oscillator like a theremin.


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