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MSP430F5438A: Hanging Issue

Anburaja A
Intellectual 365 points

Part Number: MSP430F5438A

Tool/software:

Hi,


I'm working on an MSP430F5438A controller and facing an issue where the microcontroller occasionally hangs or behaves unexpectedly. To investigate, I measured the 3.3V input voltage  (VCC) using Oscilloscope and observed a peak-to-peak voltage noise of around 20V.

Interestingly, during the time this noise was present, the controller seemed to operate normally without hanging. Could such high-frequency noise on VCC lead to unpredictable behavior or intermittent issues in the microcontroller?

I've attached a screenshot from the Oscilloscope showing the voltage noise for reference.

Your input on this issue would be highly valuable.

Thanking You...!

  • 0
    TI__Mastermind 25097 points
    Anburaja A said:
    I'm working on an MSP430F5438A controller and facing an issue where the microcontroller occasionally hangs or behaves unexpectedly. To investigate, I measured the 3.3V input voltage  (VCC) using Oscilloscope and observed a peak-to-peak voltage noise of around 20V.

    This is too large for a MCU.

    Need to find out the root cause.

    Here is the max input voltage from datasheet:

    You can try to use a watchdog to see whether watchdog can help to recovery from hangs.

  • 0 in reply to Helic Chi
    Intellectual 365 points

    Hi Helic,
    Thank you for the response,


    If noise is present on the VCC input line, can it cause the microcontroller to hang or behave unpredictably?

    I would appreciate insights specifically related to this scenario.

  • 0 in reply to Anburaja A
    TI__Mastermind 25097 points
    Anburaja A said:
    If noise is present on the VCC input line, can it cause the microcontroller to hang or behave unpredictably?

    This condition is never tested from my side, since this is over spec behavior.

    Over spec behavior can cause uncontrollable results in the chip.

    Please try to provide a good working environment and then observe again to see if the problem occurs.

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