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.

  • TI Thinks Resolved

TUSB1064: TUSB1064

Genius 3985 points

Replies: 19

Views: 505

Part Number: TUSB1064

Hi Sir,

Our customer used the TUSB1064EVM with Dell XPS15 9550, But no DP Alt mode output.

The DA400.Zip file is used DPA-400 read data, 20190103-source.bin.html is MUX side, 20190103-sink.bin.html is after MUX.

The Good NB Waveform.Zip File is used other NB waveform, But  Dell XPS15 9550 no waveform.

Could you give us a suggestion?

Hugo

DA400.zipGood NB Waveform.zip

  • Hugo

    Please use a multi-meter and check the common mode voltage on AUXP and AUXN. AUXP common mode voltage needs to be between 0 and 0.4V and AUXN common mode voltage needs to be between 2.7 and 3.6V.

    Thanks
    David
  • In reply to David (ASIC) Liu:

    Hi David,

    If by pass TUSB1064 the AUX function is ok, we are use jump.
    for DELL NB have other TI Device to choose? we need Adjustment DELL AUX voltage level?

    Hugo
  • In reply to Hugo Liu:

    Hugo

    I am suspect the SBU/AUX common mode voltage is not correct, please measure the common mode voltage on AUXP and AUXN. Common mode voltage is achieve by the pullup/pulldown resistor on AUXP/AUXN. There should be 100k pulldown on the source NB side and 1M pullup on the TUSB1064 side for AUXP, gives you 0.3V common mode voltage on AUXP. There should be 100k pullup on the source NB side and 1M pulldown on the TUSB1064 side for AUXN, gives you 3V common mode voltage. Common mode voltage must be correct in order for the communication to pass through the SBU/AUX switch.

    Thanks
    David
  • In reply to David (ASIC) Liu:

    Hi David,

    Our customer is used they are Product & TI EVM verify this issue, But this issue is following Dell XPS15 9550. other NB is Good.
    in Dell XPS15 9550 no AUX Signal, So no input & output waveform on AUX/SBU pin.
    This issue only on Dell XPS15 9550 be found.

    They are old product used the HD3SS460 with DELL XPS15 9550 is function OK. 

    Test Pass NB, DELL XPS13 9350/9360/9370, Lenovo X1, Apple MAC 2016/2017.

    Hugo

  • In reply to Hugo Liu:

    Hugo

    HD3SS460 does not check AUX common mode voltage, TUSB1064 does. Please check the common mode voltage on AUXP/AUXN, I am suspecting the AUXP/AUXN common mode voltage is out of spec with Dell XPS15 9550.

    You can also try to have AUXP pull low through 1M resistor and AUXN pull high through 1M resistor.

    Thanks
    David
  • In reply to David (ASIC) Liu:

    Hi David,

    Our customer used multi-meter check the common mode voltage on AUXP and AUXN as below.

    Is this out of spec?

    AUXP(SBU1)=1.743V
    AUXN(SBU2)=53.6mV
    MUX_AUXP(Pin26)=1.74V
    MUX_AUXN(Pin27)=55.5mV

    Hugp

  • In reply to Hugo Liu:

    Hugo

    This verifies that the common mode voltage is not correct and therefore SBU/AUX communication will not go through the TUSB1064. Common mode voltage for AUXP needs to be 0 to 0.4V and common mode voltage on AUXN needs to be 2.7 to 3.6V. Can you please try to have 1M pulldown on AUXP, 1M pullup on AUXN, and re-check the voltage?

    Thanks
    David

  • In reply to David (ASIC) Liu:

    Hi David,

    Confirmed customer, they are have used the 1M pulldown on AUXP , 1M pullup on AUXN.

    Hugo

  • In reply to Hugo Liu:

    Hugo

    To clarify, when they did measurement
    AUXP(SBU1)=1.743V
    AUXN(SBU2)=53.6mV
    MUX_AUXP(Pin26)=1.74V
    MUX_AUXN(Pin27)=55.5mV

    Do they have 1M pulldown on AUXP and 1M pullup on AUXN?

    The correct implementation is 1M pullup on AUXP and 1M pulldown on AUXN.

    Please share the schematic so that we are all on the same page.

    Thanks
    David
  • In reply to David (ASIC) Liu:

    Dear David,

    we are use the DELL  P2415Q monitor to verify the TUSB1064RNQEVM,

    the DELL XPS13 7390 & HP SPECTRE can be show the picture to monitor.

    But XPS15 9550 still not Picture on Monitor.

    we had rework TUSB1064RNQEVM 1M on R12 & R13.

      NB AUXP AUXN SBU1 SBU2
    DELL  XPS15 9550 2.964 0.0056 1.7 0.023
    XPS13 7390 0.743 2.364 0.742 2.363
    HP SPECTRE 0.716 2.324 0.717 2.324

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.