Arduino Duemilanove의 신모델 Arduino UNO 기존 Duemilanove 와의 차이점은, FTDI USB-to-serial 드라이버 칩 대신 Atmega8U2를 사용하여 데이터 전송이 더 빠르고, 더 강력합니다

The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip.
Additional features coming with the R3 version are:

• ATmega16U2 instead 8U2 as USB-to-Serial converter.
• 1.0 pinout: added SDA and SCL pins for TWI communication placed near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board and the second one is a not connected pin, that is reserved for future purposes.
• stronger RESET circuit.