USR-ES1 is an Ethernet module with SPI interface, the interface level is 3.3V TTL level, the power supply voltage is +3.3V, please ensure that the current is not less than 200mA, the voltage is continuously stable +3.3V, and the pins are compatible Wiznet's official module WIZ820io.<br> USR-ES1 embeds Wiznet's W5500 chip, uses hardware logic gates to implement the transport layer and network layer of the TCP/IP protocol stack (such as: TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE and other protocols), and integrates Data link layer, physical layer, and 32K bytes of on-chip RAM are used as data receiving and sending buffers.<br> Make the host computer main control chip only need to undertake the processing task of TCP/IP application layer control information. This greatly saves the workload of the host computer for data replication, protocol processing, and interrupt processing, and improves system utilization and reliability.<br> During operation, users can use W5500 as a peripheral RAM of MCU approximately. The external interface of W5500 is a universal 80MHz high-speed SPI, which is available for different platforms to expand high-speed Ethernet solutions.<br> size:26x24x17mm<br> Material:PCB<br> colour:As Shown<br> Package Contents:<br> 2 x Module<br> Only the above package content, other products are not included.<br> Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.