HD3SS3220: USB Type-C Mux design review HD3SS3220IRNHT

chethan md

Intellectual 840 points

Part Number: HD3SS3220

Hi,

I am using HD3SS3220IRNHT mux in my design and since I am using this part for the first time, need review support.

Attaching the Block diagram of my Board and the Schematic page which has HD3SS3220IRNHT.

FYI: the Type-C USB port is used as UFP.

Thanks,

Chethan.

5 months ago

0 chethan md 5 months ago

Intellectual 840 points

T171_Block_Diagram.pdf

0 chethan md 5 months ago

Intellectual 840 points

T171_LAN7800_Schematic.pdf

0 Shane Hauser 5 months ago in reply to chethan md

TI__Genius 16180 points

Hi Chethan,

I reviewed the schematic. Please look at the attached PDF file for my comments.

Octasic_HD3SS3220_Review.pdf

For the most-part, your schematic looks good. Aside from what I mention in my review, I recommend removing the common-mode chokes on the RX lines between the connector and the HD3SS3220. These are ok to have on TX lines, but are typically unnecessary on RX lines.

I could not see the datasheet for your ESD diodes. Please be sure the clamping voltage for these diodes is around 3V. If they do not, a diode we typically recommend is the PUSB3FR4.

Best,

Shane

0 chethan md 5 months ago in reply to Shane Hauser

Intellectual 840 points

Hello Shane,

Thanks for reviewing the Schematic, I have added the 1uF cap at pins 8 and 30. I Will remove the Choke on Rx line and also, the ESD diode used is EMI8142MUTAG which is recommended for USB3 applications.

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HD3SS3220: USB Type-C Mux design review HD3SS3220IRNHT