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PICList Thread
'16C57 resonator problems'
1998\07\27@133741 by Roger Morella

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We have been experiencing some high failure rates with resonators and
the
16C57.  We are using 3 different manufacturer's and have experienced
failure rates in the order of 2.5 to 10 %.  Some of these are
intermittant.  Someone had mentioned to me that this issue came up in
the past
on this list.

Any ideas?

Roger

1998\07\27@140613 by Todd Peterson

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At 10:23 AM 6/30/98 -0400, you wrote:
>We have been experiencing some high failure rates with resonators and
>the
>16C57.  We are using 3 different manufacturer's and have experienced
>failure rates in the order of 2.5 to 10 %.  Some of these are
>intermittant.  Someone had mentioned to me that this issue came up in
>the past
>on this list.

What speed resonators are you using?  20 MHz PIC is not reliable using a
resonator.  Also, are you using a resonator with internal capacitors?





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1998\07\27@150143 by Calvin

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I am using the ZTT-20.00MX part from ECS Inc. with complete success. I have
assembled about 50 devices using the 16C57 with this resonator and have yet
to have a single failure.

Digi-Key part# X909-ND

Calvin


{Quote hidden}

1998\07\27@152816 by myke predko

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Calvin wrote:
>I am using the ZTT-20.00MX part from ECS Inc. with complete success. I have
>assembled about 50 devices using the 16C57 with this resonator and have yet
>to have a single failure.
>
>Digi-Key part# X909-ND

I'm surprised at this - I had a lot of problems with this part on a 16C73A
(and ended up going to a ZTA with external caps) because the built in
capacitors of the ZTT (30 pF) were too much for the PICMicro at this speed.

I Just looked at the 16C5x datasheet and it it indcates that for ceramic
resonators (up to 16 MHz), 10 pF caps are required (and this was born out by
my experience with the 16C73A).

To the original requester, why don't you float the centre pin of the
resonator (ie disconnect it from ground) and wire in some caps and see what
happens?

myke

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1998\07\27@165056 by Reginald Neale

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Roger said:

>We have been experiencing some high failure rates with resonators and
>the
>16C57.  We are using 3 different manufacturer's and have experienced
>failure rates in the order of 2.5 to 10 %.  Some of these are
>intermittant.  Someone had mentioned to me that this issue came up in
>the past
>on this list.
>
>Any ideas?
>
Roger:

We have recently had some resonator problems which appear to be due to
moisture penetration of the case during post-soldering cleanup. It can seem
to be intermittent. Also, make sure that your PC boards are CLEAN. Flux
residue trapped under a crystal or resonator can also cause problems which,
again, can appear to be intermittent depending on the humidity. On a board
that works OK, breathe heavily on the area that has the resonator. If it
quits, that's a clue. On a board that doesn't work due to a suspected
resonator problem, use a heat gun to heat up the resonator. If it starts
working, maybe you've got moisture problems. If it's interior, it may stop
working again after a day or so.

Hope this is helpful,
Reg Neale

1998\07\28@010345 by Harold M Hallikainen

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       I tried several resonators with internal capacitors on a 16c74a.
The only ones I could get to work reliably at 16 MHz were those from
uRata Erie.  We've probably got over 1,000 units out now with those and
no problems.  Others (Integrity and the ones whose name I can't remember,
but Mouser or Digikey sells them) wouldn't oscillate in up to 50% of the
units.
       I talked with the manufacturers.  Each said that if it worked in
their sampe circuit with a cmos inverter the resonator was fine.  The
problem was with our circuit (which consists of just the 16c74a!).  uRata
actually tests the resonators with a variety of chips.  When I talked
with them they were still evaluating them with PICs, but I went ahead and
tried them anyway.  Never a problem.

Harold



On Tue, 30 Jun 1998 10:23:32 -0400 Roger Morella <spam_OUTrjmTakeThisOuTspamBUFFNET.NET>
writes:
{Quote hidden}

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