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BQ24392: Secondary Detection

Donovan Porter
Intellectual 1920 points
Part Number: BQ24392
Other Parts Discussed in Thread: TPS25820

Hi,

I am working on a TI-Design converting a USB Type-A port to USB Type-C.  I use the BQ24392 to determine what kind of Type-A port I am connected to and then use the CHG_DET pin to signal the Type-C device whether to advertise STD current or 1.5A.  I am using the TPS2546-EVM to act as the DCP, CDP, SDP, and Apple Charging.  The BQ24392 seems to detect every charger correctly but I wanted to understand the scope shots I took.

The system seems to work correctly but when looking at CDP and DCP ports I do not see secondary detection taking place.  Is this because the GOOD_BAT pin is always high and therefore the 2.0 switch is always on?

CDP:

DCP:

The primary detection pulses are different as well.  For DCP mode, the pulse is very short.

Thanks,

Donovan  

  • 0
    TI__Genius 16150 points
    Hi Donovan,

    Please take a look into the TUSB32x family. It fits your requirements.

    Best Regards,
    Luis Omar Moran
    High Speed Interface
    SWAT Team
  • 0 in reply to Luis Omar Moran
    TI__Intellectual 1920 points

    Hi Luis,

    Thank you for the recommendation.  The TUSB32x family would replace the TPS25820 which is not the goal.  The TPS25820 works perfect for the design as it includes an integrated power switch for protection and acts as a USB Type-C Source controller.

    The BQ24392 is still needed to detect what kind of Type-A port we are connected to.  Is there any reason the part is not doing secondary detection?

    Regards,

    Donovan