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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 23 Apr 2002 15:36:43 +0300 |
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Jason
Are you using ultrasonic cleaning? This is a sure way of buggering up
quartz crystals.
Brian
Jason wrote:
>
> Has anyone had difficulty with crystal start-up.
> Currently we are having problems with a circuit that uses a PIC16C711-
> 201/P, 2 @ 22pF load caps and a 20 Mhz AT crystal. The configuration is for
> fundamental operation.
>
> We are using a high temp screen (85 deg C storage before functional check)
> to try and weed out problems but have still found modules not functional at
> the production plant.
> Sleepy crystals have been discussed but we have experimented with three
> different manufactures of crystals we have ruled this out.
> One of our action items is to redesign and use 10 Mhz, but right now we
> aren't sure of the root cause of failure so there really isn't a guarantee
> that this plan will work.
>
> What are some specific design parameters that could be measured to arrive
> at the root cause?
>
> Thanks,
> Jason
>
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