[EN] Xmega - Development board

Hello.

I've just finished build my Xmega128a3u Dev board.
It offers:

• USART 
• USB
• TWI, aka I2C
• Atmel DataFlash
• 4x pushbuttons
• 4x LED
• SD card slot
• 2 analog ports with exteral clamping diodes (PORTA & PORTB)
• 1 digital port with current limiting resistor (PORTF)
• External voltage reference

It can be programmed via PDI, or USB (using bootloader). Also it have two sources of power:

1. From DC adapter - up to 12V
2. From USB - with circuit which prevents overshoot

Ovierview of board:

TOP:

BOTTOM:

There are some unpopulated pads - it's because I have ordered wrong size of resistor ladder, but it isn't so crucial - just for digital IO.

Surely they will fit. :)

...and bodge wires. First is well visible:

Second one caused USART to stop working. I've forgotten add trace to Vcc from nearby via (pin 9):

Overview with grouped parts and its purpose: