WIZ820IO

Overview

The WIZ820IO is an embedded Ethernet module manufactured by WIZnet Inc, designed for rapid integration into host systems. It integrates the W5200 hardware TCP/IP protocol stack chip with a magnetic jack (RJ-45) and transformer, eliminating the need for external PHY circuitry. The module operates on a 3.3V supply voltage with 5V-tolerant I/O signals and communicates via an SPI interface supporting modes 0 and 3. It supports 10/100 Base-TX speeds with auto-negotiation capabilities. The physical dimensions are 23mm x 25mm, featuring a compact form factor suitable for space-constrained applications.

Feature Summary

• Integrates W5200 chip with full hardware TCP/IP protocol stack including TCP, UDP, IPv4, ICMP, ARP, PPPoE, and IGMP support.
• Includes integrated RJ-45 connector with magnetics, removing the requirement for complex external peripheral circuit design.
• Supports eight independent sockets for concurrent connections, enabling multi-device communication without CPU overhead.
• Features auto-negotiation for 10/100 Base-TX speeds and cross-over detection to ensure compatibility with various network devices.

Applications

• Embedded industrial controllers requiring reliable Ethernet connectivity
• Remote I/O data acquisition terminals
• Edge gateway devices for IoT networks

Procurement Notes

Verify component status as the WIZ820IO has been marked as End of Life (EOL) since October 2023 per manufacturer PCN documentation. Confirm availability through authorized distributors or secondary markets. Ensure replacement strategies account for potential supply constraints given the discontinued status. Validate RoHS compliance and MSL rating prior to procurement planning.

Selection Notes

Select this module when a complete Ethernet solution with minimal external components is required. It is suitable for microcontrollers lacking built-in Ethernet MAC/PHY. Consider the W5500-based successors if newer silicon is preferred, noting that the WIZ820IO specifically utilizes the W5200 chipset. Verify SPI timing compatibility with the target MCU before final selection.

Part Context

The WIZ820IO belongs to the WIZ820 series of embedded Ethernet modules from WIZnet. It serves as a drop-in replacement for discrete Ethernet controller designs, simplifying PCB layout by combining the protocol stack chip and physical layer interface into a single unit. This series is widely recognized in the embedded industry for reducing development time associated with network implementation.

Replacement Considerations

Public confirmed substitute part numbers include the WIZ820iO (case variation) or modules based on the W5500 chip such as the WIZ850io or WIZ812mj, which offer similar functionality with updated silicon. Check pinout compatibility and firmware API differences when migrating to W5500-based alternatives.