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MSP430G2433: Integrated effective load capacitance offset

Lisa Ding
Expert 6525 points
Part Number: MSP430G2433

Hi Champs,

I checked that datasheet which show Integrated effective load capacitance typical value in 5.22. However, it didn't show Min or Max. Customer would like to know does any drift offset on capacitor. Could anyone tell me is there any condition will impact capacitor value ? If yes, does TI provide drift value ? thanks! 

  • 0
    TI__Guru 56685 points
    Hello Lisa,

    We do not have any additional information about the integrated load caps for XT1 on this part outside of what is provided in the datasheet. For a more precise effective load capacitance, please use external load caps.
  • 0 in reply to Jace H
    TI__Expert 6525 points
    hi Jace,
    Thanks for your reply. Now customer used Integrated effective load capacitance and face crystal fault. However, it’s hard to duplicate the failure condition. Crystal worked fine at first and after a while it failed. Could you please tell me have you used CM315D32768DZFT crystal? If yes, could you please share your experience ? Have you ever met crystal fail ? Thank you!
  • 0 in reply to Lisa Ding
    TI__Guru 56685 points
    Lisa,

    I can't say I've used that specific Xtal. I looked it up and it has an effective load capacitance of 12.5pf, and the internal effective load capacitance for the MSP430G2433 can only go to 11pf. With this discrepancy, I can see why they are having stability problems. I would suggest either added external load capacitance to match this Xtal (check app note below for formula to calculate cap values), or change the Xtal to a similar one wiht lower effective load capacitance value.

    Please see the following application note for more information. http://www.ti.com/lit/slaa322
  • 0 in reply to Jace H
    TI__Expert 6525 points
    Hi JH,

    thanks for your reply. I passed the application note to customer and wait for their feedback.

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