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| USB Type C, beginner question on extending from male to female |
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| Jackster:
Hi all I have a small project that I am working on. Got this USB Type C drive that I need to plug into a circuit board using a male Type C SMT connector. Then there is a Type C female SMT socket for the regular cable to connect into. Example What I am trying to get my head around is how to wire this up on the PCB. Am I right to presume that one can just do A1 to A1 and B12 to B12 as the devices on either end don't care and will sort out what they are using? Thank you Jack |
| bson:
The short answer is you can't properly extend USB 3.1 cables because they have all kinds of info in an ID chip. The second matter is that USB C cables cross TX/RX (TX on one end goes to RX on the other and vice versa). So if you want to pretend two cables are one the signals will need to be crossed an odd number of times, and with two standard cables this means your little adapter gadget has to cross them as well. And they cross A/B (top/bottom), so for example A2 goes to B2 and vice versa. Your adapter will need to do the same. The best is probably to make it look like USB 2 for both upstream and downstream. Receptacle (end-on view): Plug (end-on view): Some brief info and the full spec: https://www.reclaimerlabs.com/blog/2017/1/12/usb-c-for-engineers-part-2 http://www.usb.org/developers/docs/ Edit: actually, they also seem able to cross left-right, or both, with the plug CC pins on the device end used to determine how to mux them in the device transceiver. |
| Ziya:
The short answer is you cannot. The long answer is in the wiring diagram in the technical specs. You end up putting a resistor on one set of the VBus pins to tell the USB C end to switch over to USB 2.0 and operate in that mode. There's quite a few videos about bad USB C to A connectors floating around that don't have the resistors correctly bridging the right connections. Better Explanation https://electronics.stackexchange.com/questions/323128/wiring-diagram-for-usb-c-to-usb-a-cable YouTube Guy's Rant https://www.theregister.co.uk/2016/08/30/anker_usbc_cables_recalled/ |
| amyk:
If you just make a straight passthrough extension, then that would work; but as mentioned by others, things get messy with separate cables because they have their own "intelligence". Given the choice I would stay very very far away from USB3. |
| Jackster:
Thanks for the info guys. I sort of need USB 3 for the transfer speeds. This project is dead without it. |
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