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TPS65982 and TPS65986 CC control

Petri Koppinen
Prodigy 30 points

Other Parts Discussed in Thread: TPS65982

TPS65982 and TPS65986 Firmware User’s Guide:

 

1) Data role bits defines DFP or UFP. UFP also says port disabled, could you clarify is there possibility to put CC-lines to the Hi-Z to keep connection unattached state even devices physically connected?

 

2) CC-line activation seems be behind same control register. Is there separate control bits to disable & activate CC 1 & 2 independently?

 

  • 0
    TI__Mastermind 30310 points

    1) Data Role bits in Status Register is run-time status information. Data Status, bit 0 is also status info that indicates if anything is attached at the port with a valid CC connection for Type-C

    It sounds like you are trying to force the Type-C Port to be disabled, which is a Configuration option.

    • Register 0x28 (System Configuration), bits [2..0] = 111b = Type-C Port is disabled(Hi-Z, neither Rp pull-up or Rd pull-down enabled)

    2) No, CC1 and CC2 lines have the same behavior for a single Type-C port and both pins are needed for Cable orientation detection. They cannot operate independently when a Type-C Receptacle is used or the design will not work.

    • After Cable detection finishes, whichever CC1/2 pin is not connection to the CC wire becomes VCONN

    If a Type-C Plug is used (as in a dongle), the CC2 pin is un-used and may be pulled-down with an Ra (1kOhm nominal) to indicate VCONN power is needed by the dongle. But it cannot be used for a 2nd port.