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schematic review request for TCA6424

TS Yang
Genius 4800 points
Other Parts Discussed in Thread: TCA6424

Hi TI,

I'm developing new STB application with TI's TCA6424.

And I want you review my schematic attached.

Please kindly let me know if there's any suspicious point.

I always thanks for TI's pertinent help.

  • 0
    TI__Expert 5140 points
    Hi TS,

    Thanks for the question.

    My comments for your schematic are to keep in mind that your I/Os that are configured as inputs should not be left floating and will need pullup resistors. Outputs will not need this. Other than that, this should be fine.

    Thanks,
    Siby
  • 0 in reply to Siby James
    Genius 4800 points
    thanks for your quick answer.
  • 0
    Prodigy 80 points
    The only minor caution is be careful with the use of VCCP (+3V3_AON) and the pullups (R15701 & R15702) In certain conditions if the pullup potential of +3V3 and the VCC +3V3_AON are isolated from each other this can cause issues.

    Sometimes in designs like this its easy to use a switch mode supply for each rail and not fully realize that there is a high potential for isolation between the 2 rails. This may be desired for various reasons, but should be carefully reviewed in cases as noted in this schematic.

    Good luck

    Joe