상황
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.
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01
Choosing STM32L4 for low-power operation and integrated Ethernet MAC
02
Using MAX232 for RS-232 level translation
03
Integrating magjack to simplify magnetics and ESD protection
04
Providing a 5V to 3.3V regulator to power the system
Suitable for IoT gateways, industrial serial-to-Ethernet converters, and building automation systems requiring low power and Wake-on-LAN.