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TMS320F28379D: Current source capability of the GPIO ports

Ralf Bartling
Expert 1095 points
Part Number: TMS320F28379D

Hello,

I have a question regarding the current source capability of the GPIO ports. I have made a new pcb were GPIO64 and GPIO65 are connected with the same length to the pin header at the edge of the pcb. On both GPIO´s a rectangle signal is output.

 

C1: GPIO64 (yellow)

C2: GPIO65 (red)

 

On the scope plots you can see that the voltage overshoot on GPIO64 is much higher than GPIO65.

 

Is it possible that the GPIO64 and GPIO65 have a different current source capability?

 

 

Thank you very much

 

Ralf

 

  • 0
    TI__Guru 52020 points

    no there are many things that can cause the signals to show up like that on the scope. 

    1. your scope probe

    2. your scope input setting

    3. your pcb

    and more

    but it is not the silicon. try switching which probe is connected to which gpio and look at the signals on your scope.

    Nima