ESP32 S3 Circuit Design

flux

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Work done
  • Assessed the existing Ethernet block and confirmed the previous RMII PHY architecture centered on U3 was the non-viable portion to replace.
  • Researched an ESP32-S3-compatible LAN approach and selected a W5500 SPI Ethernet controller as the safer replacement architecture.
  • Replaced the old LAN PHY block in the schematic: removed the prior LAN8720A-CP-based support parts and added a new U3 plus new support parts C6, C7, R7, R8, R9, and R14.
  • Preserved the existing integrated-magnetics RJ45 connector J2 for DIN-rail mechanical continuity.
  • Verified the pre-replacement schematic had no critical ERC findings before the swap.
Success criteria review
  • ✅ The non-viable Ethernet architecture was identified and the replacement direction was implemented in the schematic.
  • ✅ A LAN solution proven compatible with the ESP32-S3 was selected: SPI Ethernet via U3.
  • ✅ The DIN-rail connector strategy was preserved by keeping J2 in place.
  • ❌ The new LAN interface is not yet fully wired. After component replacement, the old net connections were destroyed and the new U3 still needs full SPI, power, reset/interrupt, PMODE, and magnetics-side rewiring.
  • ❌ The project is not yet ready for layout review, because the new Ethernet block still needs connectivity restoration and then ERC/DRC re-validation.
Next steps The architecture replacement is started but not finished. The next step is to wire U3 to U1 over SPI, reconnect J2, add the required power/strap/reset network, and then rerun validation. I could not continue further in this session.
3 days
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DIN Rail ESP32-S3 Controller

DIN Rail ESP32-S3 Controller thumbnail
DIN-rail ESP32-S3 mains-powered controller with isolated 5 V supply, Ethernet RJ45, USB-C service port, and central LED module connector.

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