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Arduino Main Boards and Compatibles - Arduino A000023, The Arduino Leonardo Ethernet board is based on the ATmega32U4 microcontroller and the new Wiznet W5500 embedded Ethernet controller. The board also has Power Over Ethernet Module. The board has 20 digital I/O pins (7 can be used as PWM outputs and 12 as analog inputs). Additional features include a 16MHz xtal oscillator, RJ45 connection, micro USB connector, power jack, ICSP header, and a reset button. The Power Over Ethernet (PoE) module is designed to extract power from a conventional twisted pair Cat.5 ethernet cable. The PoE module features an input voltage range of 36 to 57V, overload and short circuit protection, 12V output, high efficiency DC/DC converter, 1500V isolation, and is IEEE802.3af compliant. The Leonardo ETH differs from the preceding Ethernet board in that the ATmega32u4 has built-in USB communication, eliminating the need for an external USB-to-serial converter. This allows the Leonardo ETH to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. The Eagle files can be downloaded here. The schematic can be downloaded here. The datasheet for the ATmega32U4 can be downloaded here. The Wiznet W5500 Ethernet chip datasheet can be downloaded here. Arduino Leonardo Ethernet with PoE A000023