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ECU – Single Ethernet Module

Compact 10/100 Mbps ECU add-on that pairs an M33-class MCU with the W5500 TCP/IP Ethernet controller. Offers RJ-45 or rugged M12-4 connectors, low BOM cost and

Lihan__

Published September 24, 2025

Original author: Jan Vidar BergerOriginal source (new tab)

ECU – Single Ethernet Module

Project description

Project Overview This module is a single-port Ethernet card for a modular ECU/PLC system. By embedding WIZnet’s W5500, the design gains a full TCP/IP stack in silicon, freeing the MCU for control tasks and keeping the BOM lean. Two connector footprints—industrial M12-4 and standard RJ-45—cover both harsh-environment and lab deployments. Key Features Embedded TCP/IP: W5500 off-loads MAC/PHY and protocol handling, enabling deterministic 10/100 Mbps links over SPI. Dual Form-Factor Ports: Board can be stuffed for either M12-4 or RJ-45 without schematic changes PoE-Ready: Extra footprint allows…

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