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The reset pin of MSP432 cannot go high

user4484512
Intellectual 600 points
Other Parts Discussed in Thread: MSP-FET

Hi,

        My schematic is as follows.

        

        The "V3.3M" is from a LDO with the output 3.3V. I measure the "nRST" level, and the value isn't pulled up to 3.3V. It's not stable and the MSP432 cannot work correctly.

        Any advice will be appreciated.

  • 0
    Guru 46710 points

    >I measure the "nRST" level, and the value isn't pulled up to 3.3V.
    Sayting that it is not 3.3V does not help much. What did you measure? exactly 3.2999V or 0? There are no any reports about reset problem you mention so you shall check against simple PCB soldering or routing error or PCB dirt or deffective capacitor. After alll pin 83 is between pins 82 and 84, both connected to GND

  • 0 in reply to Ilmars
    Intellectual 600 points
    The level of the RESET pin is a value between 0V and 3.3V, sometimes 1.2V, sometimes 2.4V, like that. It's not stable. I have checked the PCB with a multimeter, but no short-circuit can be observed between the RESET pin and any other pins. Also, I have tried to replace the 1nF capacitor with a new one, or even just remove it. But the result is still the same. Then I soldered another MSP432 in replace of the previous one, it doesn't help too. I don't know what the problem is.
  • 0 in reply to user4484512
    Guru 74080 points

    user4484512 said:
    The level of the RESET pin is a value between 0V and 3.3V, sometimes 1.2V, sometimes 2.4V

    But you do not measure this pin while a debug probe like the MSP-FET is connected and active?

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