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TMS320F28377D: MCU Pin overcurrent side effect

Joe Ji
Intellectual 2605 points
Part Number: TMS320F28377D

Tool/software:

Hi team

In customer design, they use GPIO51 (ZWTT package) to drive the LED through the pull up resistor. When GPIO set to low and LED turned on, there is 35mA current go into gpio. But I see in DS the maximum sink current is 20mA. My question is what’s the side effect if gpio sink current is large than 20mA. 

thanks 
Joe

  • 0
    Prodigy 10 points

    Hi Joe I found 4mA where did you find it is 20mA? I also have another question. What happens if I exceed the recommended value? Do I have internal protection or the gpio driver will just break?

    Thanks,

    Bing

  • 0 in reply to Binglei Xu
    TI__Intellectual 2605 points
    Binglei Xu said:
    Hi Joe I found 4mA where did you find it is 20mA?

    In DS 6.1 Absolute Maximum Ratings, input clamp current

    Binglei Xu said:
    What happens if I exceed the recommended value?

    Not sure, customer feedback in most of the time this design do not cause any issue, but sometimes MCU restart without control.

    Binglei Xu said:
    Do I have internal protection or the gpio driver will just break?

    I believe MCU has internal pull down and pull up diodes to protect pins, but not sure what will happen if the diodes broken.

    Thanks

    Joe

  • +1 in reply to Joe Ji
    TI__Expert 7085 points

    Hi Joe,

    The absolute maximum ratings violations may cause permanent damage to the device as mentioned in the datasheet.

    High level output source current and Low level output sink current is 4 mA as mentioned in datasheet. Check if the measurement of the current is accurate.

    Thanks