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shorting of VDD and VSS of TMS320F28069PZT

Amtech
Genius 4575 points
Other Parts Discussed in Thread: TMS320F2811, TMS320F28335, TMS320F28069

We are using TMS320F28069PZT dsp. Presently we observed a problem. When we powered up the card 3.3v level of dsp is ok, but dsp is get heat and we found the dsp is not working. And resistance between VDD & VSS pin of dsp is 2.3Ω ~3.0Ω, it seems that 1.9v not develope properly. We have given power manytimes earlier and it was working ok. What could be a reason for shorting between VDD and VSS?

Please give the solution

  • 0
    Guru 192875 points
    Hi,

    This can be due to improper probing or hardware connections.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    TI__Genius 13961 points

    Hi Amtech,

      Are you using TI hardware such as a control card or development kit or is this custom HW?

    Regards,

    Joe

  • 0 in reply to Joe Prushing
    Genius 4575 points
    Hi Gautam/all,

    Thanks for replay
    This is our custom hardware.
    we are using TI DSP from last 15 years. we have developed many products on TMS320F2811 & TMS320F28335. we are developed our new custom Hardware with TMS320F28069 series. What could be a reason for shorting between VDD and VSS?

    Regards,
    chirag
  • 0 in reply to Amtech
    Guru 192875 points
    What could be a reason for shorting between VDD and VSS?

    Look Chirag, its not fair to comment on the above without even checking the hardware. I've listed the 2 main reasons above, apart from that you'll have to check your board thoroughly. Check which component has got damaged thus later compromising your controller pins.

    Regards,
    Gautam
  • 0 in reply to Amtech
    Genius 4575 points
    Hi Gautam/Joe,

    We resolve the problem. The capacitor connected between VDD (pin no. 81) & VSS is shorted. So the 1.9 V was not developed. After replacing that capacitor the DSP working properly.

    But now the question is, we placed a capacitor of 2.2uf, 6.3v at every VDD pin (pin no. 3, 14, 37, 63, 81 & 91). why only the pin no 81 (VDD) capacitor is damage.

    Regards,
    Chirag
  • 0 in reply to Amtech
    Guru 192875 points
    There's a possibility that the capacitor was a damaged component itself!
  • 0 in reply to Gautam Iyer
    Genius 4575 points
    Hi Gautam,

    Thanks for your support.

    Regards,
    Chirag
  • 0 in reply to Amtech
    Guru 192875 points
    You're Welcome!

    Goodluck & Regards,
    Gautam