I think you will need to design two boards. One supporting USB uCs and second for serial uCs. Keep 1206 smd components, otherwise you must provide the board assembled. And this is because of 5x5mm limit. Try to see how many features you can put on a single type of board.
Vasi On Jan 29, 6:03 am, Sebastien Lelong <[email protected]> wrote: > Hi guys, > > Here's my last version, including a 500mA fuse (not resettable, but I only > have this one in my eagle lib), a rectifier diode for reverse polarity > protection, onboard LED moved to RC2 (CCP1 pin). Some remaining "doubts": > > - which package would I need for the diode: DO-214AA, DO-214-AB or > DO-214AC ? > > - I still have doubts about the power supply part. Initially, I wanted to > have power through USB or a battery. The board should handle 3.3V and 5V, as > an option. When using a battery, say 2 x 1.5V AAA cells, I'd need to bypass > all regulation (maybe even a pump like > this:http://www.sparkfun.com/products/9216). Using a rectifier diode will also > drop the voltage down and may not be compatible. But I could also use a 9V > battery, and thus need 5V and/or 3.3V regulators... and what if 3.3V is > bypassed, but not the 5V regulator ? Xbee board will be powered with 5V, > instead of 3.3V!!! You guessed it, I want many things and I'm not sure which > is most important at this phase. Any input, advices ? I think when I'll > start to create the PCB choices will be easier to make as I discard options > to gain room :) > > - I added pin headers, 2 x 14 pins, I may add another one dedicated to > power pins (like in Medium) if I get enough room (I doubt about it) > > In order to save some precious room, I'm thinking of (high priority to low): > > - removing Reset-via-RTS option and make it always available (2-way jumper > saved) > - remove two I²C jumpers, always make the board acting as a master, and if > not wanted, just don't solder the resistors > - remove CTS jumper option (not used often ?) > - remove power from serial module option, focusing on USB or battery > - keep only one regulator, adding an optional resistor to match required > 3.3V for Xbee when using 5V reg only. > - move to 0603 smd components..... > > Any feedback highly appreciated! > > TIA > Cheers, > Seb > > 2011/1/25 mattschinkel <[email protected]> > > > > Maybe I should just use two different voltage regulator, one AMS1117/5V > > and > > > AMS1117/3V3. Having only one component would have helped while sourcing > > > them. > > > On one prototype board I bought, there is only a AMS1117/3V3. They > > assume you want to input > 5v and get 3v output. If you want another > > voltage you can put a jumper (just solder) to connect the input/output > > of the regulator so your voltage is whatever the input is. > > > Matt. > > > -- > > You received this message because you are subscribed to the Google Groups > > "jallib" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<jallib%[email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/jallib?hl=en. > > > > jaluino_v03_bee_schematic.png > 62KViewDownload -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
