Open Drive

Dual-motor BLDC / FOC controller. Compatible with ODrive 3.5 and SimpleFOC.

Specification

Motor channels	2 (M0, M1), 3-phase each
MCU	STM32F405RGT7, LQFP-64, 8 MHz ceramic resonator (Y1)
Gate drivers	2 × DRV8301 (U1 = M0, U2 = M1), SPI-configured
Power stage	12 × IRF7480M DirectFET N-MOSFET (6 per motor)
Current sense	4 × 0.5 mΩ 2512 shunts (R12, R16, R32, R36), DRV8301 amplifiers
Supply	XT30 (J3), silk-marked MAX 48 V
Bulk capacitance	10 µF 50 V 1206 array on bottom side
Logic supply	5 V from DRV8301 (U1) buck (L1, D1); 3.3 V from U4 (SPX3819); 3.3 VA analog from U5 (LP5907)
USB	USB-C (J4), USBLC6-2SC6 ESD (U8); VBUS via F1 (500 mA) and D4 into +5 V
CAN	SN65HVD232 transceiver (U7), two connectors (J7, J8)
Auxiliary half-bridge	Q13, Q14 (CSD18540Q5B), LM5109B driver (U3); AUX_H / AUX_L from MCU; switch node HS on pad H6
Temperature	3 × 10 k NTC (TH1–TH3): M0_TEMP, M1_TEMP, AUX_TEMP
PCB	4 layers, 1.6 mm, approx. 85.5 × 56 mm, 4 × mounting holes
Assembly	JLCPCB, both sides

Firmware is not included in this repository.

Connectors

Ref	Silk	Type	Pins
J3	MAX 48V	XT30PW	1 GND, 2 VDC
J1	M0	MR30PW 3-pole	phases A, B, C
J2	M1	MR30PW 3-pole	phases A, B, C
J10	ENC0	JST SH 5-pin	1 GND, 2 +5 V, 3 A, 4 B, 5 Z
J11	ENC1	JST SH 5-pin	1 GND, 2 +5 V, 3 A, 4 B, 5 Z
J4	USB	USB-C	USB 2.0, DFU / serial via STM32
J5	Serial	JST SH 3-pin	1 GPIO_1, 2 GPIO_2, 3 GND
J6	GPIO	JST SH 6-pin	1–6 = GPIO_3 … GPIO_8
J7	CAN2	JST SH 2-pin	1 CAN_H, 2 CAN_L
J8	CAN1	JST SH 2-pin	1 CAN_H, 2 CAN_L
J9	DEBUG	JST SH 4-pin	1 +5 V, 2 SWDIO, 3 SWCLK, 4 GND

Bottom side also has solder pads for power (+ / −) and for each motor (U, V, W).

Indicators and controls

• SW1 (DFU): pulls BOOT0 to 3.3 V. Hold while powering to enter the STM32 DFU bootloader.
• D3: green LED.
• Test pads (top, right): nFAULT, VCC, AVCC, 5V.
• TP4, TP5: test points near J4.

Schematic

Open_Drive_Schematic.pdf. KiCad sheets in bldc_motor_cntroller/:

Sheet	Contents
bldc_motor_cntroller.sch	Top level
microcontroller_interface.sch	STM32F405
motor_driver.sch	M0 DRV8301 and power stage
motor_driver2.sch	M1 DRV8301 and power stage
power_management.sch	Buck, LDOs, auxiliary half-bridge
io_interface.sch	USB, CAN, encoders, GPIO, debug

Repository layout

bldc_motor_cntroller/
  *.sch, *.kicad_pcb, *.pro   KiCad project
  outputs/gerbers/            Gerber and drill files
  assembly/                   BOM and placement (KiCad export)
  production/                 JLCPCB BOM, placement, netlist, order zip
  bom/ibom.html               Interactive BOM
  images/                     Board renders
Open_Drive_Schematic.pdf

Ordering

1. Upload bldc_motor_cntroller/outputs/gerbers/ (or production/bldc_motor_cntroller.zip) to JLCPCB, 4 layers, 1.6 mm.
2. Enable assembly, both sides. Upload the BOM and positions files from production/.
3. Check part rotation in the JLCPCB PCBA viewer before ordering. Rotation of SW1 and U4 differs from the KiCad export.

Attribution

Based on X_driver by Dj140, which is based on the ODrive 3.5 schematic.

License

GPL-3.0. See LICENSE.