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MSP430FR5969-SP: Serial Communication Limits

JDJ
Expert 5276 points

Part Number: MSP430FR5969-SP
Other Parts Discussed in Thread: USB2ANY

Can the MSP430FR5969-SP have 1 SPI (connected to three devices), I2C, UART, and connected to RS-422 interface (through DS16F95WML-SP) all at the same time? Would I need any external oscillators/ clock generators?

Additionally, how do I connect the MSP430FR5969-SP to my computer using USB2ANY? I have found the pin outs on table 2 of page 14 of snau288. Can I connect, pin 2 to a gpio on msp for cs, pin 3 to my MISO pin of msp, pin 4 to my MOSI pin of msp,  pin 8 to my SPI CLK pin, pin 5 to 3.3V, pin 6 to ground and leave all other pins open? 

  • 0
    TI__Mastermind 40195 points

    Hi Jack,

    For you application you need 1 SPI, 1 I2C, and 1 UART? Is it right? I can't find any information about DS16F95WML-SP.

    No you don't need any external oscillators. except you want a more stable clock.

    That is the right way to use USB2ANY to connect MSP430FR5969-SP.

    Eason

  • 0 in reply to Eason Zhou
    TI__Expert 5276 points

    Yes, I plan on using 1 SPI, 1 I2C, and 1 UART currently. 

    Is there a recommended stable clock? From the launchpad it appears that they have a 4mHz oscillator and 32.7638 oscillator. Would those be needed? 

    Thanks for the insight! 

  • 0 in reply to JDJ
    TI__Mastermind 40195 points

    Hi,

    Please see the UG. If you want to use high frequency clk, you can use HFXCLK or DCOCLK. The problem is that the highest frequency can't beyond  HFXCLK. And for DCOCLK, it will have a +-3.5% error range.

    My advice is that:

    1. For low power mode, you can choose LFXTCLK, VLOCLK(10kHz), MODCLK(5MHz)

    2. For High frequency application you can choose DCO, HFXTCLK

    3. For high stable application, you can choose  LFXTCLK, HFXTCLK

    4. A stable clock will have a low ppm value. But it will also be very expensive.

    Eason

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