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TMS320F28034: How to keep GPIO26 output low during power-up period

Rayna Wang
Expert 3680 points
Part Number: TMS320F28034

Hi Expert,

Customer uses GPIO26 to control ULN2003 and relay, which should keep low during power up period, however they find there's a high level pulse. And in TRM, the default value of GPAPUD.bit.GPIO26 is 0, which enable the internal pullup and cause a high pulse.

Do we have any method to force the GPIO26 keeping low at power-up period by software or hardware?

Thanks!

Best Regards/Rayna

  • 0
    TI__Mastermind 41425 points

    Rayna,

    during power GPIO 26 has its internal pull-up resistor enabled. This is documented in the register description for GPAPUD.

    Please use another GPIO or add a pull-down resistor to the pin that can overpower the weak internal pull up. ~ 10K should be fine.

    Regards,
    Cody