Feature: 1. The module integrates the full hardware TCP/IP protocol stacks, no codes is required to implement the TCP/IP protocol stacks. 2. Support 10/100MBPS transfer rate, support sleep mode and wake on networks. 3. The internal integrated 32K TX/RX buffer, supports 8 independent ports to run simultaneously. 4. The module supports 3.3V or 5V power supply, which is convenient for users to use in different microcontroller systems. 5. The communication method between the module and the microcontroller system is for SPI protocol, which supports for SPI clock frequencies up to 80M. Specification: Item Type: Ethernet Networks Module Material: PCB Purpose: Suitable for operation learning and development of college students, engineers, technicians, factories, DIY, electronic enthusiasts, etc. Simultaneous Support: 3.3V & 5V Support Hard-Wired TCP/IP Protocol: TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE 10BaseT/100BaseTX Ethernet PHY Embedded System Automatic Response (full duplex/half duplex mode): Support 8 Independent Sockets at the Same Time: Support Internal 32Kbytes memory for Tx/Rx buffer Shutdown Mode: Support Wake on LAN: Support Interface: for SPI interface (for SPI MODE 0.3) to facilitate the connection with the microcontroller for SPI Clock Frequency Maximum: 80M Size: Approx. 55 x 28mm/2.2 x 1.1in Pin Definition: Pin HeaderFunction DescriptionPin HeaderFunction Description 3.3V3.3V power input pin 5V5V power input pin MISOfor SPI master input slave output pin GNDPower ground pin MOSIfor SPI master output slave input pin RSTW5500 hardware initialization pin (active low) SCSfor SPI SLAVE selection pin (active low) INTW5500 interrupt pin (active low) SCLKfor SPI clock pin NCSuspend . Package List: 1 x Ethernet Networks Module