TUSB1146: DP Lane Crossover

Owen

Part Number: TUSB1146
Other Parts Discussed in Thread: TUSB1064, TPS65987D, TUSB1064RNQEVM, TPS65987

I plan on using the TUSB1064 for a UFP and the TUSB1146 for a DFP and connecting the DP lanes between them. ( I will not be using a Display-port connector) Will I need to crossover the DP lanes between the two?

Also is it possible to get the design files and the PD project file/bin file for both EVM's.

Thank you in advance

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru**** 177301 points

Hi,

Are you doing an active cable design with Type-C on both ends?

Thanks

David

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Essentially yes. I have a USB-C Plug on the UFP and a USB-C receptacle on the DFP. USB 3.0 hub in-between and TPS65987D PD on both ends.

Thanks,

Owen

0 David (ASIC) Liu over 4 years ago in reply to Owen

TI__Guru**** 177301 points

Owen

The DP connection between the TUSB1064 and TUSB1146 is a straight connection, TUSB1064 DP0 connected to the TUSB1146 DP0, DP1 to DP1, etc.

Thanks
David

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Great. Thank you. Also do I need 100nF caps on the connections between the two?

Is it possible to get the design files for both EVMs. I noticed that the TUSB1064RNQEVM I received does not match the guide.

0 David (ASIC) Liu over 4 years ago in reply to Owen

TI__Guru**** 177301 points

Owen

The connection still requires the 100nF caps between the two.

Attached is the EVM schematic, do you also need the layout file?

HSDC069A_Schematic.pdf

3362.HSDC025A-002 Schematics.pdf

Thanks

David

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Thank you David.

Yes that would be helpful also.

Also by any chance. Would it be possible to get the PD controller project file for both EVMs?

0 David (ASIC) Liu over 4 years ago in reply to Owen

TI__Guru**** 177301 points

Owen

Would you please accept my friendship request and I will send you the file?

Thanks

David

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Okay I have a couple more questions.

1. Would AUXP connect to AUXP and AUXN to AUXN? And is there a recommended pull up or pull downs for these pins? Since I am connecting the DP lanes to each other.

2. If I plan to use the TUSB1064 and TUSB1146 in only GPIO mode. Will I have any issues regarding, getting them into USB 3.0 + 2 Lane mode, 4 Lane mode or USB 3.0 only mode. Using the TPS65987D PD controller to control each one.

0 David (ASIC) Liu over 4 years ago in reply to Owen

TI__Guru**** 177301 points

Owen

1. TUSB1064 AUXP AC coupling to TUSB1146 AUXP, and TUSB1064 AUXN AC coupling to TUSB1146 AUXN. I would recommend 0.22uF or 0.33uF for the AC coupling caps. On the TUSB1064 side, 1M pull up to 3.3V on AUXP and 1M pulldown on AUXN. On the TUSB1146 side, 100k pulldown on AUXN and 100k pull up to 3.3V on AUXP.

2. For the second question, l posted the question to our PI team and will let them address it.

Thanks
David

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Thanks David. I'll wait for their response.

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

David is there an update on this?

Thanks

Owen

0 Owen over 4 years ago in reply to David (ASIC) Liu

Prodigy 175 points

Hi David, checking in again to see if there is an update on question #2.

Thanks,

Owen

+1 Prajith Cheerakkoda over 4 years ago in reply to Owen

TI__Expert 8680 points

Hello Owen,

Answer to question 2 is Yes. TPS65987 can support this.

Thanks

Prajith

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TUSB1146: DP Lane Crossover