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Not Using USB

Gloria Mattson
Prodigy 80 points
Other Parts Discussed in Thread: AM3352

My design for the AM3352 does not require any USB.  Do I still need to provide power and/or Ground to the USB unit?  Any other hardware requirements for disabling the USB section?

Thanks!

  • 0
    TI__Guru 62905 points
     
    This information is documented in the schematic checklist which can be found at the following location.
    http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist
    If USB0 or USB1 is not used...
    • Connect the respective VDDA1P8V_USB terminal to any 1.8-V power supply and respective VDDA3P3V_USB terminal to any 3.3-V power supply. If the system does not have a 3.3-V power supply, the VDDA3P3V_USB terminal may be connected to ground.
      • The OTG_PWRDN and CM_PWRDN bits in the respective USB_CTRL register can be used to power down the unused USB PHY to minimize power supply leakage current. These bits default to the powered-up state after the AM335x device has been reset. The USB PHY can be powered down by setting both of these bits to "1".
    • The respective VBUS, ID, DP, and DM terminals may be connected to ground or left floating.
    • The respective CE terminal should be left floating.