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MSP432E401Y: MSP432E401Y customized board debugging, lost connection between PC and MSP432E401Y

zhonghai wang
Prodigy 110 points
Part Number: MSP432E401Y
Other Parts Discussed in Thread: TPS631000,

Tool/software:

Hi there,

I built a customized MSP432E401Y board to control a signal generator. The MSP432 and the signal generator share the same power module (TI TPS631000). The MSP432 is directly powered on when the system is switched on. The signal generator power is controlled by the MSP432 through a MOSFET switch (SiA517DJ). The signal generator has about 80uF bypass capacitor over its 3.3V+ and GND. 

At first, I can connect to MSP432 through XDS110 (coming with the MSP432 launch pad) and I can debug the MSP432 （the signal generator power is switched off).

As I switch on the signal generator power (turn on the MOSFET switch (SiA517DJ)) in debugging, I lost the connection between MSP432  and XDS110. 

Now the PC can detect the XDS110 as I disconnect the customized board from the XDS110. If I connect the customized board with the XDS110, the PC cannot detect the XDS110.  

Is the MSP432 on the customized board physically damaged? Should I remove it and reinstall a new MSP432 on the board?

Thank you very much for any suggestion,

Zhonghai     

  • 0
    TI__Guru**** 179696 points
    zhonghai wang said:

    Now the PC can detect the XDS110 as I disconnect the customized board from the XDS110. If I connect the customized board with the XDS110, the PC cannot detect the XDS110.  

    Is the MSP432 on the customized board physically damaged? Should I remove it and reinstall a new MSP432 on the board?

    Do you have a standalone XDS110 debug probe rather than using the on-board XDS110 on the LaunchPad?

    Is your LaunchPad on the same ground as your custom board?

    Can you show Windows Device Manager for XDS110 when:

    1. Not connected to your custom board

    2. Connected to your custom board with the signal generator disabled

    3. Connected to your custom board with the signal generator enabled

    Can you observe the power supply when you do the above three actions. Do you see any surge in current or unstable power. This may indicate some shorts on your custom board.

  • 0 in reply to Charles Tsai
    Prodigy 110 points

    Hi Charles,

    Thank you very much for your reply. 

    Do you have a standalone XDS110 debug probe rather than using the on-board XDS110 on the LaunchPad?

    -- I do not have now. If needed, I can order one. 

    Is your LaunchPad on the same ground as your custom board?

    --The customized board is powered with a 3.7V, 2000 mAh battery (currently it is 4.1V), and the XDS110 is powered with USB from PC. The ground is connected through the JTAG port (a 10-pin connector). 

    Can you show Windows Device Manager for XDS110 when:

    1. Not connected to your custom board

    -- Yes, The PC can detect the XDS110.

    2. Connected to your custom board with the signal generator disabled

    -- No.

    3. Connected to your custom board with the signal generator enabled

    -- Not tried.

    Can you observe the power supply when you do the above three actions. Do you see any surge in current or unstable power. This may indicate some shorts on your custom board.

    -- Currently I cannot measure the current. I will do the experiment next and post.

    Thank you,

    Zhonghai 

  • 0 in reply to zhonghai wang
    Prodigy 110 points

    Hi Charles,

    The issue was addressed with a clearer power supply. The power supply on board has too high ripples/noise (low to 1.76V and high to 3.84V). 

    Best,

    Zhonghai