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TPS2549: When connecting a BC1.2 portable device in DCP Auto Mode

Kaji@PAN
Mastermind 7795 points
Part Number: TPS2549

Hi,

I would like to ask you about DCP Auto Mode.
When connecting a BC1.2 portable device, I think that 2.7V will be applied to the D + and D- pins of the portable device when the portable device is connected.
With such a voltage applied to the pins on the portable device side, how can the TPS2549 recognize that a BC1.2 portable device is connected?
I don't know how the hardware works, so it would be great if you could tell me.
Also, if you have a timing chart for this connection, please provide it.

Best regards,

  • 0
    TI__Genius 9630 points

    Hello,

    The attached device is in charge of enumeration and goes through primary and secondary detection using the D+/D- lines. BC1.2 DCP shorts the D+/D- lines together. Divider3 will apply 2.7V to the D+/D- lines. Divider3 and BC1.2 DCP are two different modes, and Divider3 is a proprietary standard that is not included in BC1.2.

    I would highly recommend checking out the BC1.2 specification from USB-IF. USB-IF determines the timings and enumeration that all BC1.2 modes follow.

    Thanks,

    Emma