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BQ25611D: USB-UART bridge chip in parallel

Renan Santos Adriano
Mastermind 22270 points
Part Number: BQ25611D

Hello Team,

My customer would like to confirm if the input source type detection work by simply measuring a voltage on the USB D+- lines or does it actually communicate to the external charger? And wondering if I can connect a USB-UART bridge chip in parallel on the USB D+- lines without creating a bus conflict

Regards,

Renan

  • 0
    TI__Guru**** 166306 points

    Hi Renan,

    The D+/D- circuitry has both TX and RX voltage level and timing measurement requirements for the first 2 seconds following VBUS power up.  After that, the D+/D- pins go high impedance.  I recommend that the USB-UART be disabled or isolated by a USB switch.

    Regards,

    Jeff