STR912 RTC Crystal

Jan 31, 2008 2 Replies
A

Hello, I am trying to use a surface mount crystal for the RTC clock on the STR912F microcontroller. The datasheet states that the load capacitance is 8pF (Typ). Unfortunately, I am unable to find an SMD crystal with that load capacitance. I can, however, find 7pF and



9pF. Can they be used? Any hints or ideas?

Thank you,



A
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I

No, Yes. Look at other crystals!

Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & >32K emails --> NUL:
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E

Your not just mating the XTAL to the CPU. The traces in between add several pF of capacitance as well. So find an XTAL with 10-12pF (12.5pF is common).

Eric

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