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PICList Thread
'Ceramic resonator accuracy'
1999\01\08@103104 by Jim Robertson

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Hi Piclisters,

I am enquiring as the the suitablity of using a 4Mhz
ceramic resonator. I need the frequency to be both stable
and accurate enough to run a software timed 28800 baud
uart. I am looking at a three pin device.

Can I resonably expect good enough performance to
use a resonator instead of a xtal?

Are there "resonators and resonators?" Any tips on brands
that would pass or fail?

Thanks for any advice.

Regards

Jim
--------------------------------------------------------
Jim Robertson
Email: spam_OUTnewfoundTakeThisOuTspampipeline.com.au

http://www.pipeline.com.au/users/newfound
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1999\01\08@115426 by Andy Kunz

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>and accurate enough to run a software timed 28800 baud
>uart. I am looking at a three pin device.

>From a practical point of view, you should be fine.  From a worst-case,
you're probably toeing the line.

Andy

==================================================================
 Andy Kunz - Montana Design - http://www.users.fast.net/~montana
==================================================================

1999\01\08@203844 by Harold Hallikainen

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On Sat, 9 Jan 1999 02:33:07 +1100 Jim Robertson
<.....newfoundKILLspamspam@spam@PIPELINE.COM.AU> writes:
>Hi Piclisters,
>
>I am enquiring as the the suitablity of using a 4Mhz
>ceramic resonator. I need the frequency to be both stable
>and accurate enough to run a software timed 28800 baud
>uart. I am looking at a three pin device.
>
>Can I resonably expect good enough performance to
>use a resonator instead of a xtal?
>
>Are there "resonators and resonators?" Any tips on brands
>that would pass or fail?
>


       I have had good luck with MuRata and bad luck with everyone else
at 16 MHz.  The companies I talked with other than MuRata all said "if it
works with an inverter, the resonator is ok."  MuRata actually
characterizes the resonators for use with various processors.  Their
search engine that tells you which resonator to use with which processor
is located at http://www.murata.co.jp/search/ic-e.html .
       As to frequency stability, a resonator is about 0.5% initial
accuracy and another 0.3% over temperature.  This is much more accurate
than that required for async communications.
       A crystal is typically somewhere between 10 and 100ppm (.01%), so
it's better, but costs more, takes more board space, and doesn't have
internal capacitors.

Harold



Harold Hallikainen
haroldspamKILLspamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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