• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 78 subscribers
  • Views 357 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR5738: External oscillator

Tsurumoto
Genius 11760 points
Part Number: MSP430FR5738

Hi

Is the following external oscillator available?

- which include Spread spectrum function

  Center Spread: ±0.25%, ±0.5%, ±1.0%,±1.5%, ±2.0%, ±2.5%

- Freq: 24MHz

Thanks and Best regards,

HaTa.

  • 0
    TI__Mastermind 26420 points

    Hello Hata,

    I'm not sure I understand your question.  Are you asking for an external HF crystal recommendation or something about the FR5738 crystal support?  

    Thanks

    JD

  • 0 in reply to JD Crutchfield
    TI__Genius 11760 points

    Hi JD

    My question is if FR5738 can work with the external crystal which contains the following features.

    - which include Spread spectrum function

      Center Spread: ±0.25%, ±0.5%, ±1.0%,±1.5%, ±2.0%, ±2.5%

    - Freq: 24MHz

    Our customer has the exact crystal product in their mind, and they would like to know if it's available with FR5738 or not.

    Thanks and Best regards,

    HaTa.

  • 0 in reply to Tsurumoto
    TI__Genius 11760 points

    Hi JD

    Do you have any update?

  • 0 in reply to Tsurumoto
    TI__Genius 11760 points

    Hi JD

    Do you have any update?

  • 0 in reply to Tsurumoto
    TI__Mastermind 26420 points

    I’ve looked at this oscillator spec, and we don’t specify anything about center frequency spread, but we do specify max frequencies. Table 5.14 shows max frequency of 24 MHz input. Also, it’s noted that the “max frequency of operation the entire device can not be exceeded.” This is give in the Recommended operating conditions as 24MHz.

     Therefore, they shouldn’t use any crystal that has a chance of being over 24MHz. I think they should lower the center frequency of their crystal to leave room for these crystal tolerances.   As for the spread of the crystals, that shouldn’t have any impact on the MSP430 as an MCU, but they may notice these timing differences in their application since the MSP430s will be running at varying speeds. If their application can handle the +-2.5% variation in frequency, then it should be fine.

    Thanks,

    JD

  • 0 in reply to JD Crutchfield
    TI__Genius 11760 points

    Hi JD

    Do you agree that, for example, we set the down spread from 24MHz to -1.0%, and use software to handle it?

**Attention** This is a public forum