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TMS320F28379D: One gpio is damaged, can the gpio be isolated by disconnecting VDDIO nearby??

hai xuan
Intellectual 735 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: TPS62420

One gpio of the dsp is believed damaged: using a multimeter, the R between the gpio and GND is only 0.6 ohm. 

Current through VDDIO is pretty big, and measured the R between VDDIO and GND is as small as 8 ohm. 

I am thinking if there is other choice, such as disable or isolate the damaged gpio by disconnecting the VDDIO pin or pins nearby the damaged gpio, rather then replacing the f28379D. 

Any suggestion will be appreciated. Thanks 

  • 0
    Guru 192875 points
    Hi,

    It seems like a short throughout and so you'll have to replace the part itself. Are you experiencing mcu or LDO overheating?

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Intellectual 735 points
    It's sad, only one gpio, have to replace the dsp itself?
    no really overheating.
    At begin, I did realize a 100mA current bigger and I did nothing. Then I found the 3.3v LED indicator shut off because switch dc-dc can not maintain 3.3 v. I guess the supplying current is somehow limited so that I did not feel obvious overheating.
  • 0 in reply to hai xuan
    Guru 192875 points

    hai xuan said:
    It's sad, only one gpio, have to replace the dsp itself?

    You've no other option.

    hai xuan said:
    Then I found the 3.3v LED indicator shut off because switch dc-dc can not maintain 3.3 v

    What is the current rating of dc-dc part?

    hai xuan said:
    I guess the supplying current is somehow limited so that I did not feel obvious overheating.

    Yeah! that's what I feel.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Intellectual 735 points

    DC-DC is a typical TPS62420, which rates 600mA on output1, using 3.3V for the f28379D.