lpcware

Is VBUS input required for device mode?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jdupre on Mon Jul 15 10:20:28 MST 2013
I have a LPC17xx system with USB2 configured as host.  I'd like USB1 to be in device mode.  Unfortunately, USB_PWRD2 and USB_VBUS are on the same pin.

User Manual indicates that USB_VBUS is internally pulled high when pin is not assigned to that function.  Does this just mean that the USB device system will always think that the device is connected?

In my case, the USB device port will either be connected to a power supply, or to a computer.  (i.e the system gets power from the USB device port in all cases-- there is no other power supply.)  Do I really need to detect VBUS for USB device mode to work?

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