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MSP430F6779: MSP430F6779

Dhanabal PMCPL
Prodigy 55 points
Part Number: MSP430F6779

Hi,

Will MSP430F6779 family operate under 15 to 60 Hz frequency? Because we place it in-between VFD and load.

So, Kindly explain it for different operating frequencies.

Thanks in advance

  • 0
    TI__Genius 13215 points

    Hi Dhanabal,

    The answer is no. You can find the MCLK source as below:

    The DCO frequency is min 0.07MHz, find the table of DCO Frequency in page68 of the device datasheet.

    The DCODIV frequency is divided by the DCO clock and also can't reach as slow as 60Hz

    The LFXT will set fault flag below 1000Hz, find the fFault,LF  in table Crystal Oscillator, XT1, Low-Frequency Mode in page67 of the device datasheet.

    The VLO frequency is min 6kHz, find the table of Internal Very-Low-Power Low-Frequency Oscillator (VLO) in page68 of the device datasheet.

    The REFO frequency is 32768Hz, find the table of Internal Reference, Low-Frequency Oscillator (REFO) in page68 of the device datasheet.

  • 0 in reply to Wei.Jetim Zhao
    Prodigy 55 points

    Hi Wei,

    Thanks for your reply.

    If any other microcontroller will measure 15 to 60 Hz line frequency for energy meter application, kindly give suggestion.

  • 0 in reply to Dhanabal PMCPL
    TI__Genius 13215 points
    Hi Dhanabal,

    Can you please clarify the "operating frequencies" you mentioned? Is it the main clock frequency the CPU works or the frequency of measured line?
    My understanding was the main clock frequency the CPU works which named MCLK inside the MCU.
  • 0 in reply to Wei.Jetim Zhao
    Prodigy 55 points

    Hi Wei,

    I mentioned frequency of measured line only and not a system clock. Sorry for the inconvenience.

    Because we measure the energy after the Variable Frequency Drive(VFD) and line frequency will be change in-between 15 to 60 Hz.

    So MSP430f6779 family, will accurately measure the energy readings in 15 to 60Hz line frequency?

    Kindly explain it.

    Thanks in advance.

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