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BQ24392 OTG Design

Sam Pan
Expert 3860 points
Other Parts Discussed in Thread: BQ24392, TSU6111A

Hi Team,

May I know if BQ24392 is able to be used in a tablet which support OTG?

Will BQ24392 D+/D- be connected when OTG device plugged in?

My understanding would be since BQ24392 only disconnect D+/D- when DCP or other adapter detected, an OTG as device or host plugged in can still function correctly, just need to add circuit to have tablet generate VBUS(to connector and also to BQ24392 VBUS pin) when opearated as host(Of course they need to design the ID pin detection to act as host or device)

So I think BQ24392 could be used in OTG sytem, is my understanding correct? 

  • 0
    TI__Genius 9860 points

    Hi Sam,

    When VBUS is applied to the BQ24392, it starts the charger detection sequence. Page 8 of the datasheet shows the parameters necessary for connection/disconnection of D+ and D-. We would need to know how D+ and D- are connected inside the OTG device in order to know how the BQ24392 would behave (See DP_CON and DM_CON in the Detection Table).


    -Ryan

  • 0 in reply to C. Ryan Land
    TI__Genius 9860 points

    Hi Sam,

    After reviewing the USB spec, I realized that the OTG pullups and pulldowns are defined.

    Based on that spec, the BQ24392 will not be able to close the switches (the device will be detected as a non-compliant charger per page 8 of the datasheet). 

    You would need a device that has ID detection built in and can recognize OTG, like the TSU6111A.

    Regards,

    Ryan