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EVM430-F6779: Part Number for Crystal used in EVM430-F6779

Bilal.m.Ahmad
Intellectual 280 points
Part Number: EVM430-F6779
Other Parts Discussed in Thread: TIDM-THREEPHASEMETER-F6779, MSP430F6779A

Part Number for Crystal used in EVM430-F6779. Its component XT1.

Also if possible to have BOM for EVM430-F6779.

  • 0
    TI__Mastermind 49692 points

    Hello,

    The BOM for EVM430-F6779 can be found on the TIDM-THREEPHASEMETER-F6779 product page (essentially a reference design that uses the EVM430-F6779). On that page, the BOM can be found under the "Design files" section towards the bottom. Then, search for "XT1" inside that document. The part number is there.

    Regards,

    James

  • 0
    TI__Mastermind 49692 points

    By the way, are you still using the Energy Measurement Design Center (EMDC) in your design? Also, make sure to use the A-version device, MSP430F6779A, in your final design.

    Regards,

    James

  • 0 in reply to James Evans
    Intellectual 280 points

    Yes we are using Energy Measurement Design Center (EMDC) in our design. Kept to the principle of using the metering code produced by EMDC.

    I noticed that the crystal in BOM dco is 32.7680KHZ but i believe one used on EVM is 25. KHZ. 

  • 0 in reply to Bilal.m.Ahmad
    TI__Mastermind 49692 points

    Bilal.m.Ahmad said:
    Yes we are using Energy Measurement Design Center (EMDC) in our design. Kept to the principle of using the metering code produced by EMDC.

    That's great to hear. Thanks for letting us know.

    Bilal.m.Ahmad said:
    I noticed that the crystal in BOM dco is 32.7680KHZ but i believe one used on EVM is 25. KHZ. 

    Interesting. It should also be 32.768 kHz. You could check by outputting the frequency through I think it's the ACLK pin. If you measure the crystal directly using probes, the extra capacitance can skew the measurements. Routing the clock signal through the MCU allows you to measure it without affecting the capacitance. Hope that helps!

    Regards,

    James

  • 0 in reply to James Evans
    Intellectual 280 points

    Unfortunately i dont have the EMV to hand to double check it straight away. But if you see the screen shot below. i have highlighted the SMCLK Freq. which is by default 25,165,824 Hz which also matches with the crystal.

  • 0 in reply to Bilal.m.Ahmad
    TI__Mastermind 49692 points

    Hi Bilal,

    Sorry for misunderstanding. Yes, you're correct that the EMDC GUI configures the MSP430F6779A's internal DCO for 25.165MHz operation. The DCO supplies the system clock (SCLK) and master clock (MCLK). The external crystal, XT1, is normally 32.768 kHz and used for ACLK. This low-frequency crystal can be used for low-power modes, clocking the RTC and also as the FLL reference clock for the internal DCO. I hope that makes more sense.

    Regards,

    James

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