Good idea on adding usb pins. Would you want the associated circuitry on this board or leave out for the shield?
Cost wise I expect $13 all in. Assuming good volume of course
make VDBU available
Sorry, I missed a "D": VDDBU ...
got it. but why would this need to be broken out? why not leave it permanently tied to +3.3V supply?
What might need to be broken out is RTC crystal pads, right? I mean, if we go to the trouble of breaking out NRST, we should make RTC fully functional, right?
• Manages all Resets of the System, Including- External Devices through the NRST Pin- Processor Reset- Peripheral Set Reset
Quote from: valerun on Apr 16, 2014, 08:35 amgot it. but why would this need to be broken out? why not leave it permanently tied to +3.3V supply?Figure 5-3 in the Atmel-Dokumentation shows the purpose, when you wish to connect the backup-batterie like a small coin package. That may need some kind of solder-pad, where the connection to +3.3V can be cutted/solder-closed as needed.