TUSB1064: TUSB1064

In reply to David (ASIC) Liu:

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:

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:

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.