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USB-C Bridge Board Design (from USB-C to FFC)

Former Community Member
Former Community Member

i'm working on a little bridge PCB with USB C Male for one side and EVAFLEX 5 VS connector (http://www.i-pex.com/product/evaflex-5-vs) on the other side. The target of this is to replace the USB C cable by FFC connector. The USB C side is connected to USB C Female on RealSense D435i device (3D camera), and the other side will be connected by FFC to a PCIe to USB 3.0 outputs (RX, TX and D lines).

My question is, what happens with CC lines? On the original design that FFC is USB-C to USB-A cable. olansi air purifier

EDIT: I have broken USB-C connector of USB-C to USB A connector and I have found this:

I understand the RP function but, which is the capacitor C1 job?

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    You may have intended to include a picture - not sure where C1 is as cannot see the drawing.

    There is nothing magical about going from USB C to USB A, except that there are additional twisted pairs for the data (much as in USB 3) but there are a lot of optional pins to think about - ‘cc’ is the configuration  channel to indicate direction.

    In the standards for cc

    “Type-A” ports become Downstream Facing Ports (DFP)

    “Type-B” ports become Upstream Facing Ports (UFP)

    A resistor is placed on CC to mark whether a USB Type-C connector is a DFP or a UFP

    DFP uses an Rp, or a pull-up resistor between CC and 5V (not Vbus, as Voltage may change using USB PD)

    UFP uses an Rd, or a pull-down resistor between CC and Gnd

     The CC lines are also how Type-C implements  cable twist. There are actually two CC pins in the Type-C receptacle on the equipment. Each Type-C cable and plug of any kind has just one CC pin fitted. By monitoring the voltage on both CCs, the host &  device can figure out which orientation the cable is in and route the other wires appropriately, so plugging it in works both ways  up.  The convention is that the side that forms the Rp/Rd resistor divider becomes the ‘top’ or ‘up’ side.

    Additionally  cables should have what is in effect an ID tag chip inside the connector to allow the cable to be recognized by the controller, and speeds and so forth to be matched to the specific cable in use.

    Mike

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  • 0

    You may have intended to include a picture - not sure where C1 is as cannot see the drawing.

    There is nothing magical about going from USB C to USB A, except that there are additional twisted pairs for the data (much as in USB 3) but there are a lot of optional pins to think about - ‘cc’ is the configuration  channel to indicate direction.

    In the standards for cc

    “Type-A” ports become Downstream Facing Ports (DFP)

    “Type-B” ports become Upstream Facing Ports (UFP)

    A resistor is placed on CC to mark whether a USB Type-C connector is a DFP or a UFP

    DFP uses an Rp, or a pull-up resistor between CC and 5V (not Vbus, as Voltage may change using USB PD)

    UFP uses an Rd, or a pull-down resistor between CC and Gnd

     The CC lines are also how Type-C implements  cable twist. There are actually two CC pins in the Type-C receptacle on the equipment. Each Type-C cable and plug of any kind has just one CC pin fitted. By monitoring the voltage on both CCs, the host &  device can figure out which orientation the cable is in and route the other wires appropriately, so plugging it in works both ways  up.  The convention is that the side that forms the Rp/Rd resistor divider becomes the ‘top’ or ‘up’ side.

    Additionally  cables should have what is in effect an ID tag chip inside the connector to allow the cable to be recognized by the controller, and speeds and so forth to be matched to the specific cable in use.

    Mike

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