TUSB1142: [DELL/FXCN] CRES-refresh sch review TUSB1142 x3

Hi Robin,

I reviewed the TUSB1142 in your schematic.

This review is for U3400, however all 3 devices seem to be implemented identically, so you can use this for the other two as well: TUSB1142 Review.pdf

One thing I was confused about is why you control the AEQENZ pin with the port controller? Is this intentional?

Best,

Shane

UFP to AEQEN, this should be a error. i'll let customer remove it.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/Brickyard_2D00_MB_2D00_BRD_2D00_20240624_2D00_U3400_2D00_U3600_2D00_U3800.7zCres Refresh TUSB1142+TPS25810 SCH Review_0619.pdf

hi Shane,

please help with the final sch and layout review.

and please reply me by PPT? Thanks~

regards,

Robin Liu

hi Shane,

please hlep double check

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/Brickyard_2D00_MB_2D00_BRD_2D00_20240703_5F00_USB_2D00_TYPE_2D00_c.7z

Cres Refresh TUSB1142+TPS25810 SCH Review_0703.pdf

regards,

Robin Liu

hi Shane,

by the way, do you have TUSB1142 sch review checklist file? 

DELL is asking for every vendor to provide every part sch checklist for archive. and the sch check should be based on the checklist

Hi Robin,

The ESD diodes look ok now. If the customer wants 8kV ESD protection, you can add 2 ohm resistors on the signal lines between the capacitors and ESD diodes as well.

The FLIP logic looks correct, as you have an inverter between the port controller and the 1142. This should align the MUX correctly with the active CC channel.

Robin Liu said:

by the way, do you have TUSB1142 sch review checklist file? 

We have a schematic helper tool for this part: 1142 schematic tool.pdf

It's not a full checklist, but can help when designing in the 1142. Is this what you had in mind?

Here is my review of the layout: 2450.DELL_FXCNN_1142_layout_review.pptx

A key question I have is what is the loss of your trace between the 1142 and the CPU? I see it is about 10in at the longest point, so I want to be sure your CPU and our re-driver have enough EQ compensation.

Best,

Shane

hi Shane,

for the tool, yes, but maybe you can share me a editable tool?

let  me check with customer for the trace loss;

regards,

Robin Liu

Hi Robin,

I'm not sure the editable form will send correctly over E2E as it is in HTML format. I see we have an application note you can download that may better fit the customer's needs. This app note is a more detailed schematic checklist that covers both the TUSB1142 and the TUSB1004. Let me know if that works for you.

Looking forward to hearing the trace loss on this design.

Best,

Shane

Hi Robin,

Per the call last night, here is the excel version of the 1142 schematic checklist: TUSB1142 Schematic Checklist Excel.xlsx

Can you provide the list of devices DELL needs these checklists for?

Best,

Shane