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roger_lynx
Visitor II
April 11, 2007
Question

Crystal selection/oscillator considerations

  • April 11, 2007
  • 6 replies
  • 1217 views
Posted on April 11, 2007 at 17:35

Crystal selection/oscillator considerations

    This topic has been closed for replies.

    6 replies

    R
    roger_lynxAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    Hi,

    Would you please point me at the part of the STR9 documention which deals with crystal selection for the main internal oscillator?

    I can not seem to find any reference to the crystal properties/specs that are required by the STR9's oscillator to work properly.

    For example: crystal's cap. load CL, xtal's ESR, or the values for ext. parallel capacitors from MCU's terminals X1_CPU/X2_CPU to ground.

    Any help in this area is appreciated in advance.

    Thanks.

    H
    halim
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    Hi,

    I suggest to look STR9 getting started hardware.

    With best regards,

    Punto

    R
    roger_lynxAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    I missed that. Thank you.

    S
    sjackson
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    I saw nothing concerning main crystal ESR, load capacitance, etc in the STR9 getting started guide.

    R
    roger_lynxAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    I saw nothing concerning main crystal ESR, load capacitance, etc in the STR9 getting started guide.

    'cause it ain't there, I thanked for the excellent koan.:-]

    ..but my design works with a crystal having these specs:

    f = 12 MHz

    C_load = 18 pF

    C_shunt = 7 pF

    ESR = 100 Ohm

    S
    sjackson
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:31

    Thanks for your crystal specs. It will serve as a good starting point for me.

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