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Using USB 3.0 with a USB C receptacle/cable

Juan Ocampo
Intellectual 385 points
Other Parts Discussed in Thread: TPS65982

Hello, I basically would like a SMALL host receptacle to use on my PCB design to interface with cameras and other USB2.0 and USB3.0 devices. I came across USB C receptacle, which looks really small and should work for what I need. I have a few questions:

1. Should I bother with USB C or are there other small connectors that will work? 

2. What are the connections that I need? I noticed that USB C requires two SuperSpeed(SS1 and SS2) interfaces. Can I just connect the same SuperSpeed interface into both ports on the receptacle? It would be nice to be able to use the reversible feature of this connector. Also, can I do the same with the non SuperSpeed ports?

Type-C plug and receptacle pinouts
PinNameDescriptionPinNameDescription
A1 GND Ground return B12 GND Ground return
A2 SSTXp1 SuperSpeed differential pair #1, TX, positive B11 SSRXp1 SuperSpeed differential pair #2, RX, positive
A3 SSTXn1 SuperSpeed differential pair #1, TX, negative B10 SSRXn1 SuperSpeed differential pair #2, RX, negative
A4 VBUS Bus power B9 VBUS Bus power
A5 CC1 Configuration channel B8 SBU2 Sideband use (SBU)
A6 Dp1 Non-SuperSpeed differential pair, position 1, positive B7 Dn2 Non-SuperSpeed differential pair, position 2, negative[a]
A7 Dn1 Non-SuperSpeed differential pair, position 1, negative B6 Dp2 Non-SuperSpeed differential pair, position 2, positive[a]
A8 SBU1 Sideband use (SBU) B5 CC2 Configuration channel
A9 VBUS Bus power B4 VBUS Bus power
A10 SSRXn2 SuperSpeed differential pair #4, RX, negative B3 SSTXn2 SuperSpeed differential pair #3, TX, negative
A11 SSRXp2 SuperSpeed differential pair #4, RX, positive B2 SSTXp2 SuperSpeed differential pair #3, TX, positive
A12 GND Ground return B1 GND Ground return

3. Are the Configuration Channels(CC) and Sideband Use(SBU) pins needed?

Thank you very much for your time, 

  • 0
    TI__Guru 50120 points

    Hi Juan,

    The USB C receptacle is definitely a small connector with a mounted receptacle under 3mm. With the ability to be orientation agnostic, the USB C cable and be plugged in any orientation making it easy to use. USBC technology enables the transfer of data, video and power in a single connector.

    To answer your second question, all the listed Type C plug pinouts are required. The SS pins cannot be stub connected due to signal integrity requiring selection mux. It should be noted that the “flippabililty” of USB Type C plug requires the appropriate selection of the USB 3.1 SS signals and the USB 2.0 HS signal. On the other hand, USB 2.0(D+/D-) can be stub connected and will be appropriate for data transfer speeds up to 480Mbps.

    Lastly, the SBU pins are primarily used for the purpose of enabling display port and video streaming. If your PCB design’s application requires a display port, the SBU pins are required. The CC pin is required for cable attach detection, orientation, role detection (host or device), and power delivery.

    For your application, I would recommend using the TPS65982.



    TPS65982: USB Type-C™ and USB PD Controller Power Switch and High-Speed Multiplexer
     Product Folder:     http://www.ti.com/product/TPS65982
    Datasheet (PDF): http://www.ti.com/litv/pdf/slvsd02c

     

    Thank you,

    Jimmy Hua

  • 0
    TI__Guru 50120 points

    Hi Juan,

    Was I able to answer your question?

    Consider checking the "Verify Answer" button if I've answered the question to your satisfaction.

  • 0 in reply to Jimmy Hua
    Intellectual 385 points
    You did. Thank you. I ended up just using a USB 3.0 connector even if that connector is larger since I did not need all the additional features/headaches from USB C.