HD3SS3220: TX and RX Query

Mayur M Bharadwaj

Part Number: HD3SS3220

Hello team,

We had a query about the connection from MUX to the Type C Connector. Since Type C has a standard pinout, is there a necessity to swap TX and RX pins in our design?

over 2 years ago

Stanton Weaver over 2 years ago

TI__Intellectual 2850 points

Hi Mayur,

Can you please clarify your question and send me your schematic?

Best,

Stanton

Mayur M Bharadwaj over 2 years ago in reply to Stanton Weaver

Intellectual 400 points

USB Query.pdf

Hello Stanton, I have explained the query with help of pictorial representation in the attached pdf. I kindly request you to provide your feedback.

Stanton Weaver over 2 years ago in reply to Mayur M Bharadwaj

TI__Intellectual 2850 points

Hi Mayur,

Thank you for explaining in the pdf. Very helpful!

Scenario 1: If TX is connected to TX, RX is connected to RX, TX of host will be connected to TX at the connector as well. Is this okay? Yes, I have annotated the design with arrows to show the direction of TX (blue) and RX (yellow).

Scenario 2: Should TX and RX be swapped here? No, you have made connections correctly.

Best,

Stanton

Mayur M Bharadwaj over 2 years ago in reply to Stanton Weaver

Intellectual 400 points

Hello Stanton,

Thank you very much for your feedback.

For my understanding, I had few doubts:

1. Will TX & RX swap be taken care inside the laptop/PC to which our device is connected to? If this is not taken care, then eventually TX of our module will be connected to TX of laptop right?

2. Why TX and RX are swapped in eval kit schematics?