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[DRA829] USB related pin

Tomotaroh Kohro
Mastermind 19665 points

Support team.

I have some question for USB pins.
(1) I would like to know if USB0_ID and USB1_ID can be N/C(Open) when it will not be used.

(2) I would like to know if USB0_VBUS and USB1_VBUS can be connected with 3.3V when it will not be used.

(3) I would like to know if USB0_RCALIB and USB1_RCALIB needs to connect to PD (500Ω±１％） when it will not be used too.

(4) I would like to know If USB0_DM/DP and USB1_DP/DM can be N/A (Open) when it will not be used.

Best Regards

KORO

  • 0
    TI__Mastermind 24850 points

    Hi KORO,

    1) Better option is to pull down or up

    2) Slightly safer option is to pull down to gnd. This tells the controller there is no USB cable attached (no session). An USB driver may still load for some reason , accidently.

    3) Safer option is to mount RCALIb resistors. This will allow PHY state machine to complete recalibration. And also,, USB driver may load for some reason, and which may result in system hang .

    4) these are ok to leave open.

    A friendly reminder to connect (power) all power supplies related to USB. Which is true also for any other unused peripheral.

    Regards,

    Stan

  • 0 in reply to Stanislav Stilyanov
    TI__Mastermind 19665 points

    Hello Stan-san

    Thanks a lot.

    Br

    KORO