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Crystal problem..

Discussion in 'Electronic Basics' started by Shekhar, Feb 6, 2005.

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  1. Shekhar

    Shekhar Guest

    Hi all,
    I have a RALTRON make 32.768KHz crystal connected to a processor working
    on 5V logic. I can measure on a Osc correct freq. But when I connect the
    same crystal to a processor working on 3.3V logic, I can see oscillations
    at 200mV only on the oscilloscope. I have checked min voltage required for
    the crystal which is OK..
    CAn someone let me know as to what must be the problem ?
  2. Andrew Holme

    Andrew Holme Guest

    Do you have the same loading capacitors in both circuits?
  3. ILYA

    ILYA Guest

    IMHO loading capacitors need for choosing work harmonic of crystal.

    check oscilloscope, it must have high input impedance to except damping
    of oscillation...

    check wires, it must be short to except parasite inductive current...

    check startup circuit in chip or external...
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