MSP432P401R: OVERHEATING issue on MSP432board (RED board)

Hello,
Previously, heating issues were related to the DCDC circuit found on the launchpad. Specifically, if a user were to touch the inductor or decoupling capacitors on Vcore there was a potential to cause the circuit to fall out of regulation and actually damage the device. In order to mitigate this from happening the inductor and caps were moved away from the edge of the board. This did not eliminate the issue, but decreased the likelihood of it occuring.

Another possible cause is EOS. Exposing the IO to voltages above Vcc will cause the internal ESD structures to become damage and short current to ground.

(1) Can you remove all jumpers on J101 and supply 3.3V and ground from a bench supply? Verify that the device is still heating up. If not, then the issue is most likely with the XDS110. If it does heat up, then the issue if EOS. Making accurate power measurements will not be possible and one or multiple GPIO will no longer be functional. You may find it helpful to set all outputs to logic high and use a multi-meter to determine which pins are damaged - they will be sitting at some intermediate voltage instead of Vcc.

(2) Are you using the DCDC in your application? Can you switch to the internal LDO and see if the device still heats up?

Regards,
Chris

Hello Chris,
thank you for your reply.

As per your instructions in (1), I had set all GPIO's to logic high, then I removed the 10 jumpers on J101 and gave external 3V3 and GND supply from my another MSP432 Board (from the right end corner pins on the Board). THE IC STILL HEATED UP.Using the multimeter I checked the voltage at many GPIO's and they were all around 2.9V to 3.0V.

For (2), I used the projects from tirex, pcm_active_ldo_dco_MSP_EXP432P401R_nortos_ccs and pcm_active_dcdc_dco_MSP_EXP432P401R_nortos_ccs, in BOTH the cases the IC HEATED UP.

You suggested that possible cause of heating up might be EOS but I haven't given the pins supply more than 3V3 while I operated the board. While communicating with BQ32000 I pulled up pins 1.6 and 1.7 to 3V3 using two 10k resistors. Also, I haven't connected any other external circuitry to both of my boards.

Note: I have taped the board so that my fingers would not touch any resistor or capacitors that are on the Board.

Hello Chris,
please reply soon.
I am afraid that if I continue working on the board, it might get more damaged. So please instruct me as to what I should do now!
My work is halted because of this heating issue.