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TMS320F28375S: Comments on GPIO configuration while connect directly to 5V

Benjamin Zhou
Expert 4000 points
Part Number: TMS320F28375S

Hi Team,

  My customer connected the GPIO93 to 5V directly with accident, and affected the VDDIO pulled up to 3.8V but without broken.

  Has informed that this operation is forbidden, later projects has modified, but few products has been shipped out,  so they wonder whether there is any way to decrease the voltage to 3.3V through the GPIO configuration,  could you kindly give comments?

Best Regards

Benjamin 

  • 0
    TI__Guru 52040 points

    Unfortunately, other than modifying the board and adding external resistors I am not aware of any way we can reduce the voltage on the pin. I dont think we have a feature in the GPIO module to combat this.

    Will also let  and  comment if they know of anything you can do.

    Nima

  • 0 in reply to Nima Eskandari
    TI__Expert 5450 points

    Benjamin,

    This condition will likely cause an early failure of the device.  There is not any way to solve this through software.  Configuring the GPIO to output drive high would reduce the voltage on the pin (current through output buffer instead of ESD diode), however this would probably accelerate the failure as it would allow higher current through this pin.

    To to some risk assessment, the customer could calculate or measure the current which is injected into this GPIO driven to 5V.  If the current is above 20mA then there is a very high chance of early failure.  If the current is above 2mA then there is a moderate risk of early failure.  If there is <2mA then there is lower risk but it is not strictly quantifiable.

    Best regards,
    Jason