Re: Separate power supply

2010-04-15T08:24:30+02:00

There is a setting in usbconfig.h (I think) about "self-powered" device.
I would try to use this, and connect the USB 5V to a I/O-pin. That can then be used in the code detect if USB is connected or not.

Statistics: Posted by PHermansson — Thu Apr 15, 2010 8:24 am

Separate power supply

2010-04-15T05:24:28+02:00

I am on my 2nd V-USB project for what essentially amounts to a battery powered high power stepper motor controller. The catch is the USB interface is optional and usually will not be present. I know this will cause some issues with software when I go to implement USB control, but for now, I'm working on board layout for the +5V rail. I don't know the finer points of the USB protocol, but my first thought is to simply leave the +5V from the PC unconnected. To my knowledge, the PC does not monitor the +5V rail for anything other than over current conditions, so it shouldn't care where the 3.3V logic is coming from. Please let me know If I am missing anything.

Statistics: Posted by Sigma Relief — Thu Apr 15, 2010 5:24 am

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Re: Separate power supply

Separate power supply