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MSP430FR2433: MSP430FR2433 SVS and crystal

Part Number: MSP430FR2433

Hi Ti!

I am designing a battery powered sensor with the MSP430FR2433IYQW.

I need to have an idea (during the sensor operation life) of the battery status.

1-) Is it a good idea to use the SVS to know the battery status ?

I ask because the MSP430FR2433IYYQW has no battery monitor, only SVS.

2-) Is it possible to generate 16MHz on the DCOCLK from XT1 (32,768KHz) ?

My intention is to have a stable frequency (16MHz) in DCOCLK to achieve UART without failures.

Thank you very much. Best regrads

  • Hi albgarc2014,

    Thanks for your post.

    1-) Is it a good idea to use the SVS to know the battery status ?

    I ask because the MSP430FR2433IYYQW has no battery monitor, only SVS.

    The SVS would not be the ideal choice for a battery monitor on the MSP430FR2433. The SVS in this device only really monitors the DVCC value. This could be relevant if you are powering the MSP430 directly from your battery, but it largely is just used to trigger the low power reset state.

    It would be better to use the internal ADC for the purposes of monitoring battery voltage. 

    2-) Is it possible to generate 16MHz on the DCOCLK from XT1 (32,768KHz) ?

    My intention is to have a stable frequency (16MHz) in DCOCLK to achieve UART without failures.

    Yes, the 16MHZ DCOCLK can work quite well with XT1 at 32.768kHz as a reference for the FLL.

    Table 22-5 of the MSP430FR2xx Family User's Guide also provides the expected TX and RX Error rates based on the operating frequency of the UART system clock you are using (BRCLK). You can reference this to determine what your expected error rate would be under various settings. 

    Best Regards,
    Brandon Fisher

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