TUSB542: The requirement of layout routing

Thanks Vish,

Is that means the length should less than 12 inches from the host to the USB Connector?

Hi Kailun,

Yes end to end 12in is the absolute maximum in trace length. 

pre-channel = from SoC to redriver

post-channel = from redriver to conn.

Its best to keep the redriver closer to the connector (id say 2/3 pre-channel 1/3 post channel)

Hi Vishesh, 

May I have your support for TUSB542 sch review? Thanks!

N16JK1_PVT_IO_DB_USB A&C redriver _V2_20250411.pdf

Hi,

Yes I will try to have the review ready be EoD Monday

Hi Vishesh, 

Is there any update of this?

Hi Vishesh, 

Adjust CNFG_B2 as +1V8A

N16JK1_PVT_IO_DB_V1_20250414_1545_typeA&C.pdf

Hi Kailun,

Apologies for the delay, here is the schematic review:

1) Is there any additional AC coupling on these paths? I see that this connects to the FPC connector, but I cannot see the path from the FPC to the MB.

2) I recommend having some filtering on the power to reduce power plane noise coupling: (recommendation 1x 10uF, and 1x 100nF)

3) Tri-level CFG pins all have PUP and PDWN options allowing for 0,F,1. OK

4) TX pins go through 100nF capacitor, to 220k PDOWN (no pop), to PESD5V0R1BSF, to connector. OK

RX pins go through 0ohm resistor, to 220k PDOWN (no pop), to PESD5V0R1BSF, to connector. OK

5) Sel will be controlled by a signal form the FPC conn. no need to connect to 1.8V