Re: Choosing a Crystal for a Microcontroller
From: John Larkin (jjSNIPlarkin_at_highTHISlandPLEASEtechnology.XXX)
Date: 02/08/05
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Date: Mon, 07 Feb 2005 19:18:30 -0800
On Tue, 08 Feb 2005 01:23:15 GMT, "Chris Graham" <chrisgr@shaw.ca>
wrote:
>I'm not clear on what the considerations are for choosing a crystal. I've
>looked at electronics reference books and web sites but can't find a clear
>answer. I know which microcontroller I want to use (in this case an
>ATMEGA8). I also know the frequency (16 mhz).
>
>How would I select a compatible crystal based on factors like the load
>capacitance and ESR (equivalent series resistance)?
>
>I this case I need to select the smallest surface mount crystal that will
>work. Maybe a Citizen CS10?
>
>Also, how would I determine the capacitors to use with the crystal?
>
>Thanks.
>
Unless it's for volume production and cost is critical, just use a
surface-mount oscillator. You can have a lot of trouble with uP
on-board oscillator circuit.
John
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