Arduino Forum

Development => Other Hardware Development => Topic started by: westfw on Feb 17, 2012, 02:29 am

Title: Errors in Uno R3 Reference Design CAD files...
Post by: westfw on Feb 17, 2012, 02:29 am
On another (randomish) forum, someone was flaming about errors in the published Uno R3 Reference Design , but they don't seem to have reported them on any of the actual Arduino-related forums.  So I will...

In the R3 Schematic (both the EAGLE .SCH file and the pdf version), the USB power signal coming off of the fuse is mislabled (un-labled) n$2, when it should be "USBVCC":
(http://farm8.staticflickr.com/7181/6889091783_569daced82_z.jpg) (http://www.flickr.com/photos/58843278@N00/6889091783/)

And in the .BRD file for the PCB, there is a missing trace connecting the overvoltage protection circuitry on one of the USB signals to the USB Shield:
(http://farm8.staticflickr.com/7190/6889091847_93871eafab.jpg) (http://www.flickr.com/photos/58843278@N00/6889091847/)

Interestingly, if you were to have a board made based on these files, it should still work.  The misnamed signal has a PCB trace connecting it to the correct places, and the missing trace is in "protection" circuitry that shouldn't normally be relevant (and was not present prior to Uno.)