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MSP432P401R: Externally Powering LaunchPad

James Pace
Prodigy 110 points

Part Number: MSP432P401R

Hello,

I'm currently using the MSP432 Launchpad to control a small mobile robot. The robot will not be attached to a computer via USB while it is running. 

I have tried attaching 3.3V from my external voltage regulator to the microcontroller by attaching the voltage and ground from the external regulator to 3.3V and ground on J16. I have also removed the 3.3V jumper on J11. The microcontroller does not turn on unless I have the microcontroller connected to my computer via USB. If I disconnect from the computer, though, the microcontroller still runs, implying to me that the microcontroller is getting power from the external 3.3V, just not at the beginning?

I have also tried the same result, but removed the 5V jumper on J11 and got the same result.

How am I supposed to power the microcontroller externally, without using the USB?

Thanks,

James

  • 0
    TI__Expert 8510 points

    James,

     I don't recognize the jumper names you mentioned as being from the MSP432P401R Launchpad. (as shown in the MSP-EXP432P401R User Guide SLAU597). If you disconnect the jumpers on J101, then the Launchpad is isolated from the USB and the onboard regulator.  You can supply power externally (J6 is a good point to do this).

    Regards,

      Bob

  • 0 in reply to Bob Landers
    Prodigy 110 points

    Sorry about the jumper names. I'm not sure where the heck I got those numbers from. I had tried exactly what you described yesterday with no luck, removing the 3.3V and 5V jumpers only. Today I tried again, but also removed the Ground jumper which fixed my problem.

    Lesson learned: You also need to remove the ground jumper.

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