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trouble in MSP430FE4272 clock configuration

Getaneh Alesew79
Prodigy 70 points
Other Parts Discussed in Thread: MSP430FE4272

Hello there:I am using MSP430fe4272 for single phase electric energy measurment,the watch crystal I am using is a surface mounted oscilator of  AVX Corp/Kyocera Corp with a 32768 hz oscillating frequency,which requires a 7pf load capacitance.on the hardware external capacitors of 7pf each are added.in some boards my code works fine but on others,only some segments of the LCD are visible and an oscilator fault flag is turned on. The same code results different output

I tried by removing the external load capacitors and configure the internal load capacitors,in this case the oscilator fault flag is reset but the LCD is still not functioning.

I guess that there is a problem on oscilator configuration

any thing I should do please?

  • 0
    TI__Guru**** 202216 points
    Hello Getaneh,

    Please read through the MSP430 32-kHz Crystal Oscillators App Report(SLAA322) and Crystal Recommendations for TI MSP430 MCUs (SLAA367):

    www.ti.com/.../slaa322c.pdf
    www.ti.com/.../slaa367.pdf

    The MSP430FE4272 does not have the most dependable on-chip crystal driver and therefore special attention needs to be paid to both the type of crystal used (low ESR and tolerance) and the PCB layout (crystal close to the MCU, short traces, avoid crosstallk, implement a guard rail, clean and no solder flux present, protected from humidity, etc). External crystals are more dependable than the internal ones, and you could consider implementing the XTS toggling method. All of this is outlined in SLAA322.

    Regards,
    Ryan

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