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MSPM0G3506: Use of external LF crystal

Dhananjay Yadav
Prodigy 75 points
Part Number: MSPM0G3506


Tool/software:

Hello, 

We are using MSPM0G3506SPTR MCU in one of the application and we want to avoid using external low frequency crystal, only high frequency crystal will be used. Application operation temperature range is from -10C to 65C. RS485 communication is used. MCU is used to monitor few analog and digital signals and provide digital outputs as per application use cases. 

In this case, please let me know if external low frequency crystal can be avoided?

What will be challenges if its removed?

In which cases, external LF crystal is required.

Thanks

Best Regards

  • 0
    TI__Mastermind 46765 points

    Hi,

    It depends on what clock source you are used for UART(RS485) module. If you are using the high frequency crystal as the clock source of UART module. Then there is no risk from my side. 

    However, if you use internal LFOSC(around 32.768k) as the UART clock source, then I would suggest you to use a LFXT instead. 

    Best regards,

    Cash Hao

  • 0
    TI__Genius 10355 points

    Hi,

    There is both internal high frequency and low frequency internal oscillator in MSPM0G350x. If the external low frequency crystal is not exist, the internal LFOSC could be used as clock source in case of low power mode, RTC.

    Please see below spec of internal  LFOSC, only when you need a better accuracy or thermal features of low frequency clock than the feature blow, the external low frequency crystal may be needed.

     

    Regards,

    Pengfei

  • 0 in reply to Pengfei Xie
    Prodigy 75 points

    Hello,

    Thanks for quick response.

    Can you please mention few application use cases as an example where high accuracy LF clock source is required.

    Regards