Other Parts Discussed in Thread: HD3SS3220,
Hello!
I am working on a design with TUSB1002A for re-driving purposed, and also HD3SS3220 for USB-C flip control in a USB 3.1 application with a type-C connector.
My question has two parts.
A)
Are all USB traces in this design properly biased, as per the note in the HD3SS3220 datasheet which states: "HD3SS3220 mux does not provide common mode biasing for the channel. Therefore it is required that the device is biased from either side for all active channels".
And B)
Am I satisfying the statement in the TUSB1002A datasheet that states: "The TUSB1002A differential receivers and transmitters have internal BIAS and termination. For this reason, the TUSB1002A must be connected to the USB3.2 host and receptacle through external A/C coupling capacitors" with the exception that the TUSB1002A's RX pin caps are optional as described on page 20 of the datasheet "1) DC couple TUSB1002A's RX pins to USB connector".
Please see the attached schematic. This is my best effort to design the two ICs together. Will this work? I decided to place the AC caps for the TUSB1002A TX outputs AFTER the HD3SS3220 . I assume this is safe because the HD3SS3220 does not bias the signals itself, and also this allows the TUSB1002A to provide the biasing the HD3SS3220 requires on the TX line. I assume the omitted RX caps is safe due to the exception I mentioned above.
7875.TUSB1002A with HD3SS3220 schematic.pdf
Thoughts?
Thank you very much for your help!
- Zoltan
