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C6678 unused pin

g.f.
Guru 15520 points

Hi, I have a question about unused pin in C6678. The unused pin is as follow: - MCMREFCLKOUTP/N - TIMI1/TIMO0/TIMO1 Do I need external Pull-up/Pull-down for those pins? I have look at H/W Design Guide(sprabi2b) but there was no information for the pins. MCMREFCLKOUTP/N is output only, so is it okay to left floating? And TIMI1/TIMO0/TIMO1 are input but they have internal Pull-down, so is it okay to left floating? Best regards, g.f.

  • 0
    TI__Mastermind 18146 points

    Hi g.f.

    This is actually stated in the H/W Design Guide(sprabi2b):

    Generally, unused I/O pins should be configured as outputs and driven low to reduce ground bounce.
    Generally, if internal pullup or pulldown resistors are included, the pins can be left floating. Any pin that is output only can always be floated.

    Kind regards,

    one and zero

  • 0 in reply to one and zero
    Guru 15520 points

    Hi one and zero,

    Thank you for answering my question. Now, I understood how to process the unused pin.

    And I'm so sorry, I completely overlooked the part of H/W Design Guide which you pointed.
    I checked the guide again, and now I found the part.

    Best regards,
    g.f.