HD3SS3220: USB2.0 bus in USB-C - Using Dual Role and Opposite Direction

ali kelem

Part Number: HD3SS3220
Other Parts Discussed in Thread: TS3USB221

Hi,

I'm using HD3SS3220 and TS5USBC412 in a project.

I want to use one USB-C port as third functions.

Console & OTG & Host (opposite direction). These are different ports.

An idea is that;

Role of USB-C will be set by the type of connected device.

HD3SS3220 is in DRP mode and provides a proper USB2.0 direction path by CC pins on usb-c connector. Right?

When a laptop or PC connected to usb-c, HD3SS can sense it and will be set as UFP own.

When a peripheral (like a usb flash disk), will be set as DFP own.

There is a bidirectional USB2.0 mux (TS3USB221) at the output of port controller.

USB power provider will be supported by ideal diode ICs against power conflict.

Seems work in principle. Agree?

Thanks.

Ali

0 Brian Zhou over 3 years ago

USB2 should work, also you don't need TS5USBC412, DP1/DP2 are connected at Type C conector

0 ali kelem over 3 years ago in reply to Brian Zhou

Hi Brian,

Thanks for your reply.

I thinked to do it against signal reflection effect on unloaded 2.0 line.

Will I face reclection effect when top&bottom 2.0 lines when used in parallel?

Because I couldn't sure that regular type-c cable (in markets) has seperate usb2.0 lines or single 2.0 line.

Thanks.

Ali

0 Brian Zhou over 3 years ago in reply to ali kelem

how many usb2 lines goes into type-c,

0 ali kelem over 3 years ago in reply to Brian Zhou

One usb2 line will be using. I think usb-c cable (plug) has just single usb2 pair.

If so, I don't need usb2 mux IC, as you said.

Finally, I see (lately) that a standard usb-c_to_usb2 cable has single usb2 line.

Sorry for taking your time by second question.

Thanks Brian.

Ali

Interface forum