Description:The LilyPad Simple just got a whole lot... simpler. We've updated the Simple board to create the LilyPad USB by replacing the classic ATMega328 with the new ATMega32U4. Not only does that mean that it's running a variation of the latest and greatest bootloader, but it also means no more FTDI Basic! The only extra piece of hardware you need to program the LilyPad USB is a micro-USB cable, since the new IC has built-in USB support. The LilyPad USB is also officially supported in the Arduino IDE as of version 1.0.2!

328 motherboard;
Digital I / O digital input / output terminals, a total of 0 to 13;
Analog I / O analog input / output, a total of 0 to 5;
Support ISP download function;
Support TX / RX terminal;
Support AREF terminal;
Six PWM terminals (Pin11, Pin9, Pin6 and Pin5) are supported.
Input voltage: 3.3 V DC;
Using Atmel Atmega328V - 20 pu microcontrollers;
Product Specifications:
Microcontroller: ATmega328V
Operating voltage: 2.7-5.5 V.
Input voltage: 2.7-5.5 V.
Digital I / O Pins: 14 (6 of which provide PWM outputs)
Analog input pin: 6
DC current per I / O pin: 40 mA
Flash memory: 16 KB (of which 2 KB is used by the bootloader)
SRAM: 1 KB
EEPROM: 512 bytes
Clock speed: 8 MHz