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Crystal for MSP430FR5739

Tchouga Yannick
Prodigy 30 points

Other Parts Discussed in Thread: MSP430FR5739

Hi,

I'm building at the moment a small module with the MSP430FR5739 controller and have some concerns:

- How should I select the crystal (for XT1 oscillator pins XIN and XOUT)? In several examples, a 32 KHZ Crystal was used. Since I also want to use the 'SPI interface, should I use (8 MHz RF Ca.), A crystal with a high value. As prescribed in the data sheet.

- Which programmer and environment do you recommend for programming the chip (MSP430FR5739). I would like to use a JTAG connection.

Thank you very much

Yannick

  • 0
    Mastermind 7925 points

    Tchouga Yannick said:
    How should I select the crystal (for XT1 oscillator pins XIN and XOUT)? In several examples, a 32 KHZ Crystal was used. Since I also want to use the 'SPI interface, should I use (8 MHz RF Ca.), A crystal with a high value. As prescribed in the data sheet.

    Please see MSP430FR57xx Family User's Guide (http://www.ti.com/lit/ug/slau272b/slau272b.pdf) 3.1 Clock System Introduction

    You can also play with Grace to see what clock settings are available.

    Tchouga Yannick said:
    Which programmer and environment do you recommend for programming the chip (MSP430FR5739). I would like to use a JTAG connection.

    http://www.ti.com/tool/msp-fet430uif and http://www.ti.com/tool/ccstudio

    Regards,
    Maciej 

  • 0
    Guru 227245 points

    Tchouga Yannick said:
    - How should I select the crystal

    Base don your requirements. For being SPI master, you don't need a crystal. As master, you provide the clock and therefore neither frequency nor jitter are a problem. YOu can simply use hte internal oscillator. A crystal is required when you need a precise frequency. Here again, the application determines the crystal you need. To drive an USB controller, you'd need a highspeed crystal. For keeping track of the time, a low-speed watch crystal is the better choice. (and also requires much less power)

    There is no general answer. That's why the MSP offers you to use both (or none).

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