What to do with unused USB pins on LPC4337?

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What to do with unused USB pins on LPC4337?

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thomaslantinga
Contributor I

I'm creating a design with the LPC4337JET100 where I don't use the USB functionality.

What should I do with the following pins:

  • USB0_DP
  • USB0_DM
  • USB0_VBUS
  • USB0_ID
  • USB0_RREF
  • USB1_DP
  • USB1_DM

Can I leave the pins unconnected or should I pull them up or down?

I looked in all the available datasheets and manuals but none of them are telling what to do when not using the USB peripherals.

 

Kind regards,

Thomas Lantinga

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soledad
NXP Employee
NXP Employee

Hello Thomas,

I suggest the below connections. I hope this helps.

  • USB0_DP----- unconnected
  • USB0_DM---- unconnected
  • USB0_VBUS pulled low
  • USB0_ID---- unconnected
  • USB0_RREF pulled low
  • USB1_DP----- unconnected
  •   USB1_DM---- unconnected


Have a great day,
Sol

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xianduidong
Contributor II

Config them to general IO mode and treat them as IO pins.

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thomaslantinga
Contributor I

The pins I mentioned above are dedicated USB pins. I can't configure them as GPIO.

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