BLDC Motor Controller PCB Design
Thought
Work done
- Project was named 35mm STM32 BLDC Controller and a specification file was created.
- Added and wired the core schematic: STM32H725-family MCU, DRV8316-family motor driver, MA702 encoder, CAN transceiver, 5V buck, 3.3V LDO, USB-C + USB ESD, dual JST-GH CAN connectors, XT30 input, motor phase connector, and support passives.
- Set the PCB to 35 x 35 mm with a 4-layer stackup intent: top signal/power, L2 ground plane, L3 power plane, bottom signal/encoder.
- Enforced the critical MA702 placement: U3 is set to bottom layer at board center (0 mm, 0 mm).
- ✅ Specified functional components were added, with documented substitutions where exact library MPNs were unavailable.
- ✅ ODrive Micro-style key schematic wiring was applied for PWM, current-sense outputs, MA702 SPI, CAN RX/TX, and USB DP/DM through ESD/series resistors.
- ✅ Board size and 4-layer stackup were configured.
- ✅ MA702 exact center/bottom placement was enforced.
- ❌ Full component placement, routing, dense DRV8316 via-in-pad thermal array, and ERC/DRC cleanup are still incomplete.
- Finish PCB placement for all remaining components, especially edge connectors and DRV8316 power-stage clustering.
- Add/verify the DRV8316 thermal via-in-pad GND array.
- Route USB/CAN/high-current motor and power nets, then review and clear ERC/DRC issues.
- Note: execution stopped because credits were exhausted before layout/routing/final checks could be completed.
Full component placement, routing, dense DRV8316 via-in-pad thermal array, and ERC/DRC cleanup are still incomplete.
Thought for 2 sec
You’re right — those items are still incomplete.
Current state:
- Schematic core components and key nets have been added/wired.
- Board is set to 35 x 35 mm, 4-layer intent.
- MA702 encoder is placed on the bottom layer at exact board center.
Remaining work:
- Place all remaining components on the PCB.
- Route power, motor phase, USB, CAN, SPI, and control nets.
- Add dense GND thermal via array under the DRV8316 exposed pad.
- Run and fix ERC/DRC issues.
I can’t continue executing those tasks right now because there are no available ACUs for AI actions.
Check ERC/DRC
Placement constraints
Thermal via pattern
Critical routing nets
