Quad BLDC Drone ESC Design
When ACUs are available, add high-current pads for 6S_PROTECTED and GND plus a 3V3_A header.
Worked for 2 mins 57 sec
Added the ESC-side power input interface:
- J21: Würth REDCUBE M5 lug for
PM_6S_PROTECTED - J22: Würth REDCUBE M5 lug for
GND - J23: 5-pin low-current header for
3V3_Aand GND, with one spare pin marked no-connect
Focused ERC/connectivity check found no new issues for J21–J23.
Define the SPI mezzanine pinout between the ESC and flight controller with spare pins.
Thought for 5 sec
I’ll define a practical SPI mezzanine pinout for the stacked ESC ↔ flight-controller interface with grounds, reset/fault lines, temperature telemetry support, and spare pins, then record it in the project notes/spec.
Worked for 1 min 53 sec
Defined the ESC ↔ flight-controller mezzanine pinout in Project Specification.
Summary:
- 60-pin ERM8/ERF8-style pinout.
- Shared SPI bus with separate CS/INT/FAULT/RESET/READY for STM32 U1 and U2.
- Includes heartbeat, sync, arm/safe lines, 18 ground pins, and 18 spare/reserved pins.
- High-current 6S power stays off the mezzanine connector.
Add mezzanine connector
Assign MCU pins
Run full ERC
Review connector sourcing
Prepare PCB placement
