This repository contains all the firmware and hardware for Electrium Mobility's 2026 ESC, which is a 36V/15A 3-phase BLDC motor controller built around the STSPIN32G4 SiP's integrated gate driver and STM32G4 MCU, supporting 6-step and FOC commutation!
- Voltage: 10-36V (maximum 10S battery pack)
- Current: 15A continuous (25A peak)
- Power: 500W (implied by above)
- External 5V/1A Buck Regulator
- Internal VCC (using 10V)/200mA Buck Regulator
- Internal 3.3V/150mA LDO
- 1410uF Bulk Capacitor Bank (bleed resistor discharges it in 1 min)
- Reverse Polarity Protection (dual back-to-back PMOS)
- Inrush Current Limiting (RC soft-start)
- Transient Overvoltage Protection (60V TVS clamp)
- Short-circuit and Overcurrent Protection (SCREF divider)
- Phase Currents (0.5m shunt resistors) using Internal PGA with Overcurrent Protection (note: measures negative currents, but regenerative braking is not supported)
- Phase Voltages (for sensorless feedback method using BEMF zero-crossings)
- PCB Temperature (NTC thermistor)
- Power Supply Input (VM+, VM-)
- SWD Programming/Debug (STDC14)
- Throttle: UART (digital commands), ADC (analog pot)
- Motor: Phase Outputs (U, V, W), Hall Sensors (A, B, C), Winding Temperature
- CAN (FD)
- Expansion Headers: SPI, I2C, 4 unused pins
- Buttons: RESET, BOOT, USER
- LEDs: Power Rails, READY, FAULT, 2 configurable (STATUS1, STATUS2)
- Onboard Test Points
- 4-layer (stackup: Signal/Power, Ground, Ground, Signal)
- 125x80mm with 2oz Outer and 0.5oz Inner Copper
- Partitioned Grounding Scheme (separates high-power PGND and logic GND)
