WIZ550SR

Overview

The WIZ550SR is a compact serial-to-Ethernet module integrating the WIZnet W5500 TCP/IP controller and an STM32F103RCT6 microcontroller. It operates on a 3.3V supply (2.97V to 3.6V) with a typical current draw of 180mA at 100M link. The module features an MDI interface for direct PHY connection, UART data ports (RXD/TXD/RTS/CTS), and debug interfaces. It supports RS-232C conversion and includes status indicators for power, link, activity, and TCP connection state.

Feature Summary

• Integrates W5500 hardware TCP/IP stack with STM32 MCU
• Provides direct MDI signal access without onboard transformer
• Supports full UART handshake signals including RTS and CTS
• Includes dedicated debug UART and application boot triggers

Applications

• Serial-to-Ethernet gateway implementation
• Embedded system network expansion
• Industrial device remote monitoring
• IoT sensor data transmission

Procurement Notes

Verify specific revision levels against the latest datasheet before integration. Confirm that external magnetics are required as the module lacks an integrated transformer. Ensure voltage levels match the 3.3V logic requirements of the host system.

Selection Notes

Select this module when a small form factor serial-to-Ethernet solution is needed. It requires external RJ45 magnetics due to the exposed MDI pins. Suitable for designs where the host MCU needs direct access to Ethernet physical layer signals.

Part Context

This module utilizes the W5500 chip, which embeds a hardwired TCP/IP protocol stack. This architecture reduces CPU load by handling network protocols in hardware, allowing the connected STM32 microcontroller to focus on application logic rather than network processing overhead.

Replacement Considerations

WIZ550EVB serves as the evaluation platform for this module. No direct pin-compatible replacements are documented in the provided source material.