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MSP430 Noise

abhishek Sabnis
Expert 1730 points


I am using Ti's MSP430F2132 in a noisy environment and request your assistance to solve an issue.

In our new application, I am seeing 3 output port pins change state from 0 to 1 when a fast switching transient occurs nearby.

The software appears to be working correctly and will eventually re-write these ports back to low states.

Thus far our efforts to solve the problem have not been successful. These efforts included:

1. Changes and improvements to the grounding of the MSP430.

2. Improve filtering of 3.3V power.

3. Some filtering on port pin that were closed to the vicinity of noise.

I am  fairly confident that this is not a controller reset

I  appreciate any assistance you could provide.

 Thanks,

  • 0
    Expert 1255 points

    I think there's a fairly broad range of things that could be causing this problem -- but the fact that the bits "eventually re-write the ports back to low states" suggests a software issue to me.  A stack overflow (related, somehow perhaps, to that fast transient you're seeing -- or perhaps causing that transient)  could cause this behavior, for example -- or a short power brown-out.

    What kind of debugging are you able to do to monitor this issue?  Have you watched your Vcc line to see if it is clean, and not experiencing major spikes toward ground?

  • 0
    Expert 1610 points

    Hi,

    did you monitor your ground, supply and port lines if there are any transients on it? Are all port pins properly terminated and decoupled? Can you post a part of your schmatic and layout? Im curios as this is the second post with this problem in short time.

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