I’ll build the smallest practical CM5 support schematic: first I’ll inspect the CM5 pinout and requirements, then add only the essential power/regulation, decoupling, and required biasing, wire it, and run checks.

Minimum architecture selected: regulated 5 V enters through USB-C, CM5 handles its onboard 3.3 V/1.8 V regulation, and GPIO_VREF will be tied to CM5_3.3V for normal 3.3 V GPIO. I’m adding only the USB-C input, VBUS protection, and two input capacitors.

Wiring is complete. The remaining ERC items are expected unused CM5 interfaces and unused USB-C data/SBU pins, so I’m marking them explicitly as no-connect rather than adding expansion circuitry.

Done — I added a minimal CM5 bring-up schematic: USB-C 5 V input, VBUS TVS protection, 100 µF + 100 nF input capacitance, CC1/CC2 to the CM5, all 5 V/GND pins wired, GPIO_VREF tied to CM5_3.3V, and unused interfaces explicitly marked no-connect.

I also created Minimal CM5 Bring-Up Notes with the BOM, power budget, datasheet assumptions, and validation notes. Remaining review items are layout-stage airwires because the board is not placed/routed yet; U1:VBUS_EN is intentionally unused for this minimal boot-only design.