Objective Development Forums

Re: avrusb with external power source

2009-04-13T04:37:41+02:00

Most self-powered devices seem to request 2mA (smallest value possible) via config descriptor for that reason it seems.

Statistics: Posted by Grendel — Mon Apr 13, 2009 4:37 am

Re: avrusb with external power source

2009-04-11T15:50:04+02:00

It is possible to use an external supply. I'd recommend taking all the power from your own supply and leave the USB 5V unused. This violates the spec, I think, because your pull-up delivers current when the host is powered off, but that should not cause any real problems.

Statistics: Posted by christian — Sat Apr 11, 2009 3:50 pm

avrusb with external power source

2009-04-03T17:09:09+02:00

Hi everyone!
Is this possible to use avr usb when powering board from external source (large graphical display)?
What should be the proper schematic diagram?

Thank you in advance.
regards,
Grzegorz Sowa

Statistics: Posted by sowisz — Fri Apr 03, 2009 5:09 pm