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TMS320F28027

mAmper
Prodigy 80 points

Other Parts Discussed in Thread: TMS320F28027

Hello!
I have a small board using tms320f28027. Usually current consumption is 0.13/0.11 A - depends on using jtag xds100v3 or not. At some moment something get wrong and I couldn`t debug. I found that current consumption became about 0.07/0.05 A accordingly. There is 0 volts on TRST pin(2), as I remember there should be some level about "1".
I cant change tms write now. 

Any idea how to check operability and fix this problem?

  • 0
    Guru 192875 points

    Hi,

    mAmper said:
    There is 0 volts on TRST pin(2), as I remember there should be some level about "1".

    TRST should be pulled down and should be at 0. Do you get any error while debugging?


    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Prodigy 80 points
    Hi!
    It`s started to work again after i disconnect jtag and switch to usb jtag alone for his identifying. I did some simple manipulations like this (connect/disconnect jtag to board). At some moment current consumption became normal and jtag was identified when it was connected to board. It`s strange, because all connections on board looks fine.
    There is a pull-down 2.2 k on pin 2 (TRST). And when it`s all ok there is RMS: 3.12 V exactly on TRST.
  • 0 in reply to mAmper
    Guru 192875 points
    Great that I started working again.

    Regards,
    Gautam