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Original question:

MSP430F147: Datasheet change and power-up failures at 8MHz

MSP430F147: Power-up failures at 8MHz

anand2623
Prodigy 180 points
Part Number: MSP430F147

Hi,

We are using MSP430F147 in our boards with a 8Mhz on XT2.

On few of our boards, we see that the microcontroller cant seem to get a stable XT2 for ever.

i.e the OSC fault is never gets cleared. We tried replacing the oscillators but to no effect.

Reprograming the chip with the same code seems to fix the issue.

We have used the same chip on many versions of the same board with no issues.

Please do advice on this

  • 0
    TI__Mastermind 49692 points
    Hello,

    What's your supply voltage? Keep in mind that the datasheet mentions that VCC must be greater than or equal to 2.8V for XT2 frequencies up to 8MHz.

    Regards,

    James
  • 0 in reply to James Evans
    Prodigy 180 points

    Hi James,

    Our supply voltage is 3.2V

    regards,

    Anand

  • 0 in reply to anand2623
    TI__Mastermind 49692 points
    Hello,

    Thanks for letting me know. Can you try increasing your supply voltage to 3.6V and see if the issue goes away? I had some detailed discussion about this issue in the original thread linked at the top of this thread. As I mentioned in the other thread, Figure 5-1 in the datasheet seems to have the arrow labels swapped, but more importantly, at 8MHz operation, the device requires a supply voltage greater than 3.2V for proper programming execution. Since your supply voltage could be slightly below the 3.2V minimum, this could be why you're seeing this issue.

    Regards,

    James

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