• Old / clones / Version 1 : WIZ5100 chipset → Arduino “Ethernet” library
• Modern / Adafruit shields / Version 2 : WIZ5500 chipset → “Ethernet2” library

➯ https://www.arduino.cc/en/Main/ArduinoEthernetShieldV1

• Requires an Arduino board
• Operating voltage 5V (supplied from the Arduino Board)
• Ethernet Controller: W5100 with internal 16K buffer
• Connection speed: 10/100Mb
• Connection with Arduino on SPI port

• https://www.wiznet.io/product-item/w5100/
• Wiznet 5100 Datasheet
• All-in-one Ethernet Controller : Hardware TCP/IP, MAC & PHY
• Fully hardwired network protocol
• Direct & Indirect Bus and SPI for Host Interface
• Stable Data Communication

• Hardwired TCP/IP protocols : TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE
• Un-attackable hardware network engine for preventing network attacks such as flooding, spoofing, injection
• Host Interface : Direct/Indirect Bus & Serial Peripheral Interface (SPI MODE 0, 3)
• 4 Independent hardware socket
• Internal 16Kbytes memory for TCP/IP packet processing
• 10BaseT / 100Base TX Ethernet PHY Embedded
• Support Auto-Negotiation (Full & Half Duplex, 10 & 100 Based)
• Support Auto-MDIX
• 3.3V Operation with 5V I/O signal tolerance
• LED outputs (TX, RX, full/half duplex, Collision, link, speed)
• 80LQFP lead-free package (10x10mm)