CIRCUIT DESIGN
STM32L4 RS-232 Ethernet Bridge
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CASE ANALYSIS
Scenario
Designing a smart energy monitor that needs to log data from a legacy RS-232 device to a local web server and respond to Wake-on-LAN for remote management.
Key decisions
- Choosing STM32L4 for low-power operation and integrated Ethernet MAC
- Using MAX232 for RS-232 level translation
- Integrating magjack to simplify magnetics and ESD protection
- Providing a 5V to 3.3V regulator to power the system
When to reuse this
Suitable for IoT gateways, industrial serial-to-Ethernet converters, and building automation systems requiring low power and Wake-on-LAN.
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