HD3SS3220: Design review

Jeffrey Chung1

Part Number: HD3SS3220

Hi Team,

There is a USB 3.0 working issue on the customer's board. The USB connection of this device isn't worked properly, so please check this schematic and let me know the points that have to change.

5383.HD3SS3220.pdf

Regards,

over 1 year ago

0 Shane Hauser over 1 year ago

TI__Mastermind 30130 points

Hi Jeffrey,

I am working on this and will have an answer for you this week.

Best,

Shane

+1 Shane Hauser over 1 year ago

TI__Mastermind 30130 points

Hi Jeffrey,

I looked at your schematic and noticed a couple things you should fix.

You do not want common mode chokes on the RX lines as they are not transmitting into a receptacle.

Don’t use size 0603 AC caps on the TX lines, use 0201 or 0402 to minimize signal reflections in the trace.

Can you provide more details on the issue you are having? This may help narrow down the cause.

Best,

Shane

0 Jeffrey Chung1 over 1 year ago in reply to Shane Hauser

Genius 3300 points

Hi Shane,

Thanks for your response. When USB 3.0 device is connected into a receptacle(CN2), the USB host of customer board can't be detected it. It makes sense if it is common mode choke issue on RX line.

Regards,

0 Shane Hauser over 1 year ago in reply to Jeffrey Chung1

TI__Mastermind 30130 points

Hi Jeffrey,

I see, in that case let me know if there are still issues after removing those chokes.

Best,

Shane

0 Jeffrey Chung1 over 1 year ago in reply to Shane Hauser

Genius 3300 points

Hi Shane,

This issue has been resolved after removing those common mode chokes. Thanks for your support.

Regards,

Power management

Power management forum

HD3SS3220: Design review