The scenario
Design a gateway circuit to bridge RS-232 serial devices to Ethernet using an STM32F107 microcontroller, supporting Modbus TCP. The circuit integrates a MAX3232 level shifter, LAN8720 Ethernet PHY, and a 3.3V regulator with decoupling capacitors for reliable operation.
What is in this drawing
Read the decisions behind it.
01
STM32F107 chosen for integrated Ethernet MAC and UART peripherals
02
MAX3232 provides 3.3V-compatible RS-232 level shifting
03
Single 3.3V supply derived from 5V input using LDO regulator
04
External terminal blocks allow connection to RS-232 and Ethernet networks
Use when building an industrial IoT gateway that translates legacy RS-232 protocols to Ethernet, enabling cloud connectivity and remote monitoring.
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