1

Solution overview

The STEVAL-SPIN3204 motor control board can be set up to control a three-phase brushless DC (BLDC) motor

based on position feedback data from one of the following sources:

•

external quadrature encoders or Hall Effect sensors

•

on-board circuitry that senses the back electromotive force (BEMF) generated by the load motor.

OC comp

threshold

select

DC/DC Buck conv

SW

VM

STM32F031 MCU

OC_SEL

control

Gate Driver

Control Logic

12V

VREG

VREG12

VM

3.3V

R

HS

OUT

LS

VBOOT

3x Power Half-bridge

GH

R

VBUS

GL

HS

LS

BEMF

circuit

VDD

GPIO_BEMF

STSW-SPIN3204

motor control

Firmware

STM32F103CB

LDO regulator

LD3985

ESD protection

USBLC6-2

3V3_STLINK

USB Type B Mini

MCU

STSPIN32F0B

BLDC

controller

ST-LINK/V2-1

programming interface

THREE-PHASE

BLDC MOTOR

← Hall or encoder →

STEVAL-SPIN3204

evaluation board

OPAMP

configuration managed by the triple half-bridge gate driver on the BLDC controller.

The board senses the current flowing into the motor phases through a shunt resistor, and the resulting signal is

amplified, filtered and forwarded to the STSPIN32F0B BLDC controller MCU and control logic gate driver for

monitoring and peak current limitation or overcurrent protection, depending on the driving method implemented in

the firmware (voltage mode or current mode, respectively). Voltage sensing is implemented through a voltage

divider from the motor supply voltage (VBUS) and sent to the BLDC controller MCU for monitoring purposes.

The board also features an embedded ST-LINK/V2-1 programmer/debugger to help you load, test and modify the

motor controller firmware.

STEVAL-SPIN3204

Solution overview

DB3914 - Rev 1

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