W5100 is a versatile single-chip network interface chip, internal integration 10/100 Ethernet controller, mainly used in high integration, high stability, high performance and low cost of embedded systems.Using W5100 can realize no Internet connection of the operating system.W5100 with IEEE802.3 10 base-t and 802.3 u 100 base - TX compatible.W5100 internal integration of the whole hardware, and after many years of market validation of TCP/IP protocol stack, Ethernet medium transport layer (MAC) and physical layer (PHY).Using W5100 don't need to consider the control of Ethernet, only need for a simple port (Socket) programming.

• Features
• A variety of interface can choose: direct bus, indirect bus and the SPI bus.
• Support hardware TCP/IP protocol stack, supports TCP, UDP, ICMP and IGMP, IPv4, ARP, PPPoE.
• As many as four separate port
• Internal integration 16 kbyte transceiver cache
• Indicate the output, a variety of information including RX and TX, Full/Duplex, Colision, Link, Speed
• Support automatic polar transformation (DMI/MDIX)
• 3.3 V power supply, IO is compatible with 5 V voltage signal
• Take so, double row 2 * 2.0 mm pin 14
• Size :5.2x3x1.5cm (length x width x high )