Bare PCB breakout for an arduino compatible ATmega128?

Community PCB Design
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Anyone know where I can get a bare schematic for what components would be needed to add a bootloader to a surface mount ATmega128? I am working on a chip that will modify another motherboard, and all I really need are 8 input outputs and be able to program it with the Arduino IDE. Any help is MUCH MUCH MUCH appreciated, thanks guys/gals!

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dmcmulle:
Anyone know where I can get a bare schematic for what components would be needed to add a bootloader to a surface mount ATmega … and be able to program it with the Arduino IDE.

I'm assuming you are designing/modifying a board, and you want to be able to put a completely blank ATmega168 on your board, and later program it in the standard Arduino way.

The Lilypad is pretty close to the minimum components on a board needed to program that board in the Arduino way.

Look at [the Sparkfun Lilypad Arduino page and click “schematic”.

You should see 2 connectors:

  • - the 2x3-pin "ISP" connector. Typically the engineer at the board house plugs a "traditional" AVR programmer into this "ISP" connector to install the bootloader into a completely blank ATmega168.
  • - the 1x6 pin "JP2" connector. Typically the software person plugs a standard USB cable from a PC to "FTDI Basic Breakout", then plugs that into the "JP2" connector, to download scripts from the Arduino IDE into the ATmega.
    • Some Arduino boards replace the 1x6 pin "JP2" connector with a standard USB connector -- they incorporate all the stuff in the "FTDI Basic Breakout" board onto the Arduino board.

    If that’s what you want to do, skip the Lilypad schematic, and instead look at the

    [Arduino Duemilanove schematic.

    You’ll see it has the same 2x3-pin “ICSP” connector as the Lilypad.

    (The ATmega328 datasheet says that the ATmega48/ATmega88/ATmega168/ATmega328 differ only in memory sizes, boot loader support, and interrupt vector sizes).](http://arduino.cc/en/Main/ArduinoBoardDuemilanove)](LilyPad Arduino 328 Main Board - DEV-13342 - SparkFun Electronics)