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TPS25820: USB type C VCONN design guide

sp lee
Prodigy 110 points
Part Number: TPS25820

Tool/software:

Hi,

I am developing a smart cable and found that TPS25820 is a good choice. However, from the datasheet I couldn't find detailed design guide lines for using the VCONN feature. Of course it is all according to the USB type C spec, but it is new to me as well.

My specific question is that if I hook a 1k pull down resistor to the CC2 line to indicate that the cable requires VCONN, does TPS25820 provide power to CC2 later until the cable is unplugged? Then how do I switch on the actual load on VCONN instead of the 1k pull down resistor?

Thanks for your help.

  • +1
    TI__Mastermind 25406 points

    Hi SP,

    The Vconn resistor (Ra) is presented by an E-marked USB Type-C cable, when TPS25820 detects the Ra (800Ohm to 1.2kOhm) on one of the CC lines in the cable it will automatically apply Vconn power to the cable through one of its CCx pins. TPS25820 will supply Vconn as long as the E-marked cable is connected, Vconn is removed when the cable detach. 

    For more information on Vconn refer to the snippet below from the USB Type-C Specification: 

    Thanks and Regards,

    Raymond Lin