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TPS65910: Which Power Supply is the GPIO PU Referenced to...?

David Beaty
Prodigy 70 points
Part Number: TPS65910

I'm a bit confused about which power supply the GPIO pullup is referenced to...  The Signal Description Table 4.1 says VDDIO but the I/O Pullup and Pulldown Characteristics Table 5.5 says VRTC...  Which is it...? 

  • 0
    TI__Genius 16410 points
    Hello David,

    I've assigned this post to the appropriate applications engineer, he will respond to your question.

    Regards,
    Karl
  • 0
    TI__Genius 17380 points
    Hi David,

    I just went to the lab with an EVM and it looks like the Signal Description Table is the closest to correct. In particular, it has a programmable *pull down* resistor, not a pull up resistor.

    For the TPS659109 at least, this pull-down resistor was disabled by default, not default active.

    When programmed as a GPI, it's VIH / VIL is relative to VDDIO. When programmed as a GPO, it can be pulled up to a variety of supplies. VRTC 1.8V appears to have been used in testing the VOL when used as a GPO. Hopefully this clears up the confusion.

    Thank you for bringing this to my attention, I've submitted this for datasheet cleanup.