STSPIN233 Click Board™

How Does The STSPIN233 Click Board™ Work?

The STSPIN233 Click Board™ is optimized for driving brushless motors in portable applications. Therefore, the STSPIN233 from STMicroelectronics contains three independent H-Bridges, and each of them controls one phase of the brushless motor. These integrated H-Bridges are very efficient - with ON resistance of approximately 400mΩ (HS+LS) across each bridge. These features make STSPIN233 click perfectly suited for rapid development of various battery-powered stepper motor applications, including toys, printers, mechatronics, drones, robotics-related applications, etc.

Besides the brushless driver IC, the STSPIN233 Click Board™ also has STM32F031K6T6 MCU onboard, which serves as a "brain" of the STSPIN233 Click. It comes with a preloaded firmware, which is programmed to take control of the motor driver. It reads the current motor status and signals from an optional rotary encoder, calculates values of desired and real motor status in real time and makes necessary corrections to the motor driver. The motor can be controlled by using these pins: RST, INT, and UART pins – RX and TX. That way, very reliable brushless motor driver is achieved.

The RST pin of the STSPIN233 Click is used to set both bridge outputs in HIGH-Z mod, disconnecting the power supply from the H-Bridges. This pin allows lower average power consumption as no current can flow from the power supply to the motor. This pin is routed to the RST pin of the mikroBUS™.

The INT pin has a double purpose: when set to a high logic level, it acts as a chip enable, allowing the device to operate. In the case of a fault condition on the IC, it will be asserted to a LOW logic level, acting as an interrupt pin. After a timeout period defined by the external capacitor and resistor values, a restart attempt will be made. This pin is routed to both INT pin of the mikroBUS™, allowing the host MCU to use both functions. The mentioned pin is labelled as FLT on the Click board™, respectively.

The motor power supply can be connected to the input terminal labelled as VIN and should be within the range of 1.8V to 10V. Brushless motor coils can be connected to the terminals labelled as U, V, and W. The STSPIN233 Click Board™ requires an external power supply for the motor in order to work. However, it also requires 3.3V from the mikroBUS™ rail.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the STSPIN233 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
NC	1	AN	PWM	16	NC
Reset Input	RST	2	RST	INT	15	INT	Fault Interrupt Out
NC	3	CS	RX	14	RX	UART Receive
NC	4	SCK	TX	13	TX	UART Transmit
NC	5	MISO	SCL	12	NC
NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

STSPIN233 CLICK ELECTRICAL SPECIFICATIONS