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AM3505/17 Reserved Pins

Ken Turocy
Prodigy 160 points

For clarification, do the pins labeled "RESERVED" need to be pulled up to 1.8V through a 10K resistor for proper operation?

The data sheet does not specify what voltage to use on these pull ups.

  • 0
    TI__Mastermind 41665 points

    This is a good question, it seems this has been omitted from the datasheet, I will file this as a documentation bug.

    What is more concerning is that the schematics from the AM3517 EVM appear to leave the two reserved pins (U2 and V1 on the ZCN package) floating. Keep in mind however that the EVM is not meant to be a reference design, and is laid out early in the device validation process, so just because it leaves the pins floating does not mean production designs should.

    My impression is that the pull up would be based on the VDDSHV setting you have, either 1.8v or 3.3v, though this is not an official statement (until the datasheet is updated).

  • 0
    TI__Genius 9190 points

    Ken, those pins should be pulled to VDDSHV.  I have made note of this and will put it into the next rev of the data manual.

    Thanks,
    Jeff