Descriptions: USR-ES1 is the Ethernet module of a SPI interface, interface is TTL level of 3.3V, power supply voltage of +3.3V, please ensure that the current is not less than 200mA, voltage is continuous and stable +3.3V. Function features: High speed SPI interface 80MHz Hardware-TCPIP-protocol stack user built in, almost without understanding the complex network protocol knowledge Supports up to 8 Socket Support TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE protocol Integration of the data link layer, physical layer Support the wakeup Support high speed serial peripheral interface (SPI model 0, 3) Internal 32K bytes receive buffer The embedded 10BaseT/100BaseTX Ethernet physical layer (PHY) Support auto negotiation (10/100-Based full duplex or half duplex) Does not support the IP patch The working voltage of 3.3V, I/O and 5V voltage signal LED display (full duplex or half duplex, network connection, network speed,active) Pin type package ultra small, convenient for embedded applications Application of C sample project Package Include: 1 x W5500 SPI to LAN Ethernet Network Module