The UPDI-3, is a simple add-on board allowing the programming of the new AVR microcontroller from Microchip. The board works as bridge between the UPID target, and a serial communication. The serial communication can from different sources, eg. an FTDI cable or the FTDI-USB. The board has been designed in KiCAD by using the fab libraries.
Below the board schematic and layout :
Here the UPDI-3 pinout:
Here the soldered board , useful to look up which components are needed:
And here an example on how to connect the UPDI-3 board between a target and the FTDI-USB: