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Query on charging USB 2.0 Devices using TPS65982 IC

Other Parts Discussed in Thread: TPS65982

Hello,

We have heared about Type-C based TPS65982 which Power Delivery controller providing cable plug orientation detection at USB Type-C connector.

Kindly Let us know about TPS65982 IC is capable to charge USB 2.0 devices or not (As per BC1.2 specification - different types of charging profiles:- CDP, DCP, and SDP ) and If yes, Is there any mechanism to handle charging of USB 2.0 devices?


Any help in this case,it will be appreciated.

Thanks & Regards,
Ritul

  • Ritul,

    Moving your post to the right forum for your question.
  • Ritul,
    I apologize for us missing this question. Unfortunately, you were still not in the right forum. I moved you to the right one, but please contact me if you still need help getting your question answered.
  • The TPS65982 does not explicitly support charging of devices using the BC1.2 detection method.

    The TPS65982 integrates BC1.2 detection for when it is a power sink and looking into a host which support BC1.2

    According to the USB Type-C specification, a USB Type-C to Legacy Type-A Receptacle converter cable will have a pull-down resistor, Rd, which will allow the TPS65982 to supply 5V on VBUS and when USB PD communication fails, the TPS65982 will default to USB 2.0 and 3.0 communication.

    A BC1.2 host product can advertise SDP, CDP, or DCP by implementing a discrete or integrated solution on the D+/D- lines at the Type-C connector, and a device which supports BC1.2 detection should be able to sink 500mA, 900mA, or 1.5A through the PP_5V to VBUS switch integrated inside the TPS65982.

  • Hi Brian-san,

    I apologize for interupting..
    I would like to confirm just in case.
    ----------------------------------------------------
    A BC1.2 host product can advertise SDP, CDP, or DCP by implementing a discrete or integrated solution on the D+/D- lines at the Type-C connector, and a device which supports BC1.2 detection should be able to sink 500mA, 900mA, or 1.5A through the PP_5V to VBUS switch integrated inside the TPS65982.
    ----------------------------------------------------
    I believe PP_5V to VBUS switch is unidirectional switch from PP_5V to VBUS, so it couldn't sink current from VBUS of TypeC connector to PP_5V0.
    I believe PP_5V0 is incorrect and PP_HV is correct.
    Is my understanding correct?





    Best Regards,
    Yaita / Japan disty

  • Yaita-san,

    My post was referring to the USB2 Device as the Sink in that sentence.

    The TPS65982 is Sourcing through the PP_5V0 switch, acting as the USB2 Host.
    In this case, external circuitry it required to advertise BC1.2 capabilities.


    When the roles are reversed, the TPS65982 is the USB2 Device and the far-end device is the USB2 Host: in this case the TPS65982 will Sink through the PP_HV or PP_EXT FET path, depending on the confiugration.
    In this case, no external circuitry is required, as the TPS65982 performs BC1.2 detection as a Sink.


    Sorry for any confusion I may have caused with my wording in the previous post.
  • Hi Brian-san,

    Thank you for your kind reply.
    I understood what you said.

    Best Regards,
    Yaita