• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 32 subscribers
  • Views 184 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPD12S521: Leak current when source side is off and sink side (External equipment) is ON.

Motoyasu Hattori
Genius 9415 points
Part Number: TPD12S521

Hi,
My customer has the following questions.  Could you please answer them?

*1.
According to the following figure.2 on the datasheet P.1, DCLK_OUT signal is pull-up on 5V.  Also, on Sink side, 47kohm pull-up is required on DCLK_OUT.

On the case that Source side (TPD12S521) is power-off and Sink side (outside of HDMI connector) is power-on,  is it possible that leak current is occurred from outside equipment (47kohm pull-up) to TPD12S521 equipment?

*2.
If yes, could you please propose how to protect this leak current?

*3.
According to IBACK DRIVE parameter on datasheet P.5, MAX current is 5uA.  Is this included CEC pin?   On HDMI specification, when source is OFF, CEC leak current is less than 1.8uA.  Can TPD12S521 meet this specification?   Please advise us.

Thanks and best regards,
M.HATTORI

  • 0
    TI__Expert 3890 points

    Hi M.HATTORI,

    Please see the below comments:

    1/2. I think might be due to the internal is intergraded MOS (from in to OUT) with the body diode. But it is up to the DCLK pin of HDMI controller.

    3. Yes, as the table shown.

    Regards,

    Ansel

  • 0 in reply to Ansel Song
    TI__Genius 9415 points

    Ansel-san,

    I want to confirm it.

    >> 3. Yes, as the table shown.

    Your answer is "IBACLK DRIVE parameter is less than 1.8uA."  Is it correct?

    Also, 

    >>On HDMI specification, when source is OFF, CEC leak current is less than 1.8uA.  Can TPD12S521 meet this specification?

    Please let us know your comments.

    Thanks and best regards,
    M.HATTORI.

  • 0 in reply to Motoyasu Hattori
    TI__Expert 3890 points

    Hi M.HATTORI-san,

    >> 3. Yes, as the table shown.

    Your answer is "IBACLK DRIVE parameter is less than 1.8uA."  Is it correct?

    [AS]: No, I mean is Max-5uA.

    Also, 

    >>On HDMI specification, when source is OFF, CEC leak current is less than 1.8uA.  Can TPD12S521 meet this specification?

    [AS]: Actually, there is no any spec. for TPD12S521, I think it is determined by he DCLK pin of HDMI controller. 

    Regards,

    Ansel