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TPS2540: D+/D- pass-through for OTG dual role devices

Benjamin Porter
Prodigy 30 points
Part Number: TPS2540

The TPS2540 datasheet shows a "Host Sense" block in the diagram on page 9, but doesn't describe its function.  If the TPS2540 detects the DM_OUT and DP_OUT pins are in a device mode state, will it simply turn on the data switches from in to out?

If not, is there another way to get the TPS2540 to pass through the D+ and D- signals, but not pass power from the OUT pin?  Or is there another product that behaves as a USB charge port power switch controller for a OTG device in host mode, but a signal pass-through when in device mode?

  • 0
    TI__Genius 9630 points

    Benjamin,

    I'm not sure what you mean by device mode and host mode. Are you referring to the difference between: SDP/DCP/CDP? What mode are you trying to accomplish from those three?

    I am also not sure what you mean by changing the data switches from in to out. DP_IN and DM_IN go to the peripheral and DP_OUT and DM_OUT go to the host controller or EC. 

    To clarify your last question, you want a device that can output D+ D- signals that does not have a dedicated power path? If that is the device you are looking for, the TPS251x may be what you need. 

    Thanks,

    Emma