Copperhead circuit buckets: one-page list

Good fit now

• MCU control and dev boards: RP2040, ESP32 or STM32 boards. Matters: power tree and decoupling; 90 Ω USB pair; boot pins. Why this fit: core of its demo record.
• Sensor and IoT nodes (module-based): ESP32 soil sensor, BLE beacon. Matters: µA sleep budget; antenna keep-out; pre-certified module. Why this fit: low layout risk.
• Simple low-voltage regulators: 12 V to 5 V buck, LDO rails. Matters: tight input-capacitor loop; IPC-2152 widths; thermal. Why this fit: Fang buck demo.
• Single-cell chargers: Li-ion charger with fuel gauge. Matters: charger datasheet compliance; thermal. Why this fit: used in its logger demo.
• Low-voltage LED boards: PWM LED board. Matters: thermal path; current accuracy. Why this fit: LED demo board.

Partial: needs a human for layout

• Motor drives and robotics: brushed-DC driver, 24 V servo drive. Matters: short power loop; gate loop; heavy copper; thermal. Why this fit: servo drive is netlist only.
• Multi-cell low-voltage BMS: 4S–16S BMS. Matters: Kelvin sensing; FET current path; protection timing. Why this fit: own example rated "hard".
• Industrial I/O: 24 V PLC inputs, RS-485, 4–20 mA. Matters: IEC 61131-2 behaviour; isolation; surge. Why this fit: no creepage rules.
• USB-PD supplies and PoE: 100 W bench supply, PoE device. Matters: switching layout; 1500 V PoE isolation; EMC. Why this fit: no isolation net class.
• Precision analog and audio: ADC front end, microphone board. Matters: grounding; noise; drift. Why this fit: layout decides.
• Drone flight controllers: Betaflight-style FC boards. Matters: clean IMU supply; dedicated gyro SPI bus; vibration. Why this fit: dense layout.
• Automotive controller prototypes: CAN node, vehicle control unit. Matters: load-dump protection; AEC-Q parts; CISPR 25. Why this fit: no AEC-Q filtering.
• SBC/SoM carrier boards: CM5 or Jetson carrier. Matters: controlled impedance; length matching; stackup. Why this fit: human-led; no impedance defaults.

Out of reach

• Chip-down high-speed digital: DDR or PCIe processor boards. Matters: impedance; return paths; signal integrity. Why this fit: no impedance rules.
• Chip-down RF: discrete-matched radio, 5.8 GHz transmitter. Matters: 50 Ω lines; matching; certification. Why this fit: rated "hard".
• High-current ESCs: 4-in-1 drone ESC. Matters: power loop; heavy copper; thermal. Why this fit: routing left to humans.
• High-voltage and mains power: offline SMPS, inverter, on-board charger, high-voltage BMS. Matters: creepage; magnetics; certification. Why this fit: no creepage rules.
• Medical and safety-certified production: patient monitor, ISO 26262 or DO-254 hardware. Matters: 2×MOPP isolation; safety analysis; certification. Why this fit: process work, not PCB tooling.

Easiest to check automatically

• MCU control and dev boards
• Module-based sensor and IoT nodes
• Simple low-voltage regulators
• Precision analog (circuit level)
• Drone flight controllers (netlist rules)
• Industrial I/O (schematic side)

Open questions

• Does the Copperhead CLI call Fang simulation? [UNVERIFIED]
• Do IEC 62619 / UL 2580 apply to the BMS boards in scope? [UNVERIFIED]
• Can Copperhead or Fang run full signal-integrity simulation? [UNVERIFIED]
• Are AEC-Q filtering and ISO 26262 work truly absent? [UNVERIFIED]