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'32khz osc problems'
2000\04\14@094727 by Marc

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Today I had an 32khz XTAL startup problem, that was obviously caused by a
too small load capacitance.  For the product it is essential that the
PIC always runs. Therefore I want to make further reliability tests with
the XTAL and caps.

What is the worst case condition for voltage and temperature, under which
a marginally connected XTAL is most likely to fail?

I have set the PIC to LP mode, if that matters.

2000\04\14@103310 by James Wilson

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We use LP mode at 32KHz a lot. Have you considered the reliability of this
under varying humidity. You need to carefully consider how you protect your
PCB. We use 12pF both sides and keep all leads short.

James Wilson
spam_OUTjwilsonTakeThisOuTspamgeminidataloggers.com


| {Original Message removed}

2000\04\14@120522 by Martin SchŠfer

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You probably need a series resistance between OSCOUT and the XTAL (about
some 100K). The crystals with 32kHz have a maximum power consumption of 1
uW. So be careful. If the Cap's are too big the quarz is destroyed
thermally.

Martin

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;**   name:      Martin Schaefer             **
;**   company:   elektronik 21 GmbH, Germany **
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> {Original Message removed}

2000\04\14@124714 by David VanHorn

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At 01:08 AM 4/14/00 +0000, you wrote:
>Today I had an 32khz XTAL startup problem, that was obviously caused by a
>too small load capacitance.  For the product it is essential that the
>PIC always runs. Therefore I want to make further reliability tests with
>the XTAL and caps.

What ate the xtal specs?
(Loading C, Impedance at resonance, Operating temperature etc)
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2000\04\14@191928 by William K. Borsum
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<x-flowed>We use carbon composition resistors 100K in series to also introduce enough
noise into the circuit to guarantee startup--also seems to significantly
improve startup times from up to 20-30 seconds down to 1-2.  NOTE: Carbon
Comp--not metal film!
Kelly

At 09:18 AM 4/14/00 , you wrote:
{Quote hidden}

> > {Original Message removed}

2000\04\14@193418 by David E Arnold

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Just curious,

What are the typical applications that people are using low freq. oscillators
in the 32khz range? What's the main advantage? Low power consumption?
Anything else?

-Dave





"William K. Borsum" <.....borsumKILLspamspam.....DASCOR.COM> on 04/14/2000 04:09:46 PM

Please respond to pic microcontroller discussion list <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>

To:   PICLISTspamspam_OUTMITVMA.MIT.EDU
cc:    (bcc: David E Arnold/SYBASE)
Subject:  Re: 32khz osc problems




We use carbon composition resistors 100K in series to also introduce enough
noise into the circuit to guarantee startup--also seems to significantly
improve startup times from up to 20-30 seconds down to 1-2.  NOTE: Carbon
Comp--not metal film!
Kelly

At 09:18 AM 4/14/00 , you wrote:
{Quote hidden}

> > {Original Message removed}

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