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TPD6S300: How to disconnect C_CCx and CCx

Daisuke Higa
Genius 4795 points

Part Number: TPD6S300
Other Parts Discussed in Thread: TPS65987DDK, , TPS65987

Tool/software:

Hi support team all.

I plan to use it in combination with the TPS65987DDK.
I would like to not support dead batteries, but since this does not seem to be possible with the TPS65987, I am considering whether this is possible with the TPD6S300.

I am thinking that with the TPD6S300, I should be able to disconnect the C_CC1/2 and CC1/2 lines using the FET circled in red in the diagram below.
To disconnect them, do I just need to turn off the device's power supply (VPWR)?
The switch circled in the red has a body diode, but if VPWR is disconnected, will current not flow from CC1/2 to C_CC1/2?

Best regards,

Higa

  • 0
    TI__Mastermind 34841 points

    Hi Higa,

    If you do not wish to support dead battery connections, then do not connect RPD_G1 to CC1 and RPD_G2 to CC2.  This connection was made external to the IC to support the exact case that you are wanting to support.

    The TPD6S300 should be powered from LDO_3V3 from the TPS65987DK.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Genius 4795 points

    Hi chuck-san

    Thank you for your prompt reply.

    However, my question is as follows.
    Could you please answer it?
    How can I turn off the internal FET?

    [My question]

    I am thinking that with the TPD6S300, I should be able to disconnect the C_CC1/2 and CC1/2 lines using the FET circled in red in the diagram below.
    To disconnect them, do I just need to turn off the device's power supply (VPWR)?
    The switch circled in the red has a body diode, but if VPWR is disconnected, will current not flow from CC1/2 to C_CC1/2?

    Best regards,

    Higa

  • +1 in reply to Daisuke Higa
    TI__Mastermind 34841 points

    Higa,

    The internal fet cannot be user controlled.  It will be turned off until LDO_3V3 is available, and then is fully self controlled as a OVP protection deevice.

    Because the device is powered by LDO_3V3, it will not present a dead battery resistor under the connections that I described earlier. There is a very small leakage across the FETS through the body diode, but this is not a large enough current to impact the type C negotiation because the DFP (source) will not apply RP until it is prepared for type C negotiation and the system is configured to not present RD in the dead battery condition, so there will be no type C connection negotiation until the TPS65987DK has completed it's boot.

    Regards,

    Chuck