The Arduino Ethernet is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins, 6 analog inputs, a 16 MHz crystal oscillator, a RJ45 connection, a power jack, an ICSP header, and a reset button.
An optional Power over Ethernet module can be added to the board as well.
The Ethernet differs from other boards in that it does not have an onboard USB-to-serial driver chip, but has a Wiznet Ethernet interface. This is the same interface found on the Ethernet shield.
A six pin header can be connected to an FTDI cable or USB Serial board to provide USB power and communication to the board.
Summary
| Microcontroller | ATmega328 |
| Operating Voltage | 5V |
| Input Voltage Plug(limits) | 6-18V |
| Input Voltage PoE (limits) | 36-57V |
| Digital I/O Pins | 14 (of which 4 provide PWM output) |
| Arduino Pins reserved: | |
| 10 to 13 used for SPI | |
| 4 used for SD card | |
| 2 W5100 interrupt (when bridged) | |
| Analog Input Pins | 6 |
| DC Current per I/O Pin | 40 mA |
| DC Current for 3.3V Pin | 50 mA |
| Flash Memory | 32 KB (ATmega328) of which 0.5 KB used by bootloader |
| SRAM | 2 KB (ATmega328) |
| EEPROM | 1 KB (ATmega328) |
| Clock Speed | 16 MHz |
| W5100 TCP/IP Embedded Ethernet Controller | |
| Power Over Ethernet ready Magnetic Jack | |
| Micro SD card, with active voltage translators |
