Features Suppport 3.3V / 5V High Speed Ethernet controller W5500 chip SPI interface Internal 32Kbytes Tx/Rx buffer 10/100 Ethernet PHY embedded Support Auto Negotiation (Full / Half duplex, 10 / 100-based) Hardwired TCP/IP Protocols : TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE User Selectable GPIO pin Support SD-card slot for storage Support I2C, UART interface