Brushless 16 Click Board™

How Does The Brushless 16 Click Board™ Work?

The Brushless 16 Click Board™ as its foundation uses the LB11685AV, a three-phase full-wave current-linear-drive motor driver from ON Semiconductor. The LB11685AV adopts a sensorless control system without the use of a Hall-effect device. It features a current soft switching circuit for silent operation. Alongside, it is also characterized by easy control, current limit, and various protection features. This Click board™ makes the perfect solution for delivering quiet, cool operation to home appliances and office automation equipment.

Start-Up Mode is set when the LB11685AV starts up its operation. After the "START" position, the LB11685AV outputs energization timing patterns for a Start-Up in each output (U/V/W) to determine the position of a motor. Based on the timing pattern, the motor starts rotation in which LB11685AV detects back-EMF, which defines a motor position. As a result, the LB11685AV outputs energization timing, which synchronizes with the motor position to the motor. That's how a motor starts rotation. When the LB11685AV switches from Start-Up Mode to Regular rotation Mode, the driving current is switched to full driving mode, which increases the rotation speed until it is stabilized.

The Brushless 16 Click Board™ communicates with MCU using several GPIO pins. The device can be enabled or disabled through a dedicated Enable (EN) pin routed on the CS pin of the mikroBUS™ socket while the FG pin routed on the PWM pin serves as a rotation speed indicator and outputs a rectangular waveform in reverse to V motor signal made by back EMF. Besides, it is possible to detect motor lock events on the interrupt RD pin routed to the INT signal of the mikroBUS™ socket, where the indication of such a condition is performed using the red LED indicator labeled as MOTOR LOCK.

The Brushless 16 Click Board™ supports an external power supply connected to the input terminal labeled as VM, next to the U, V, W, and COM terminals on which the BLDC motor needs to be connected. The absolute maximum rating of the power supply voltage is 19V which must not be exceeded, even for a moment. Do not exceed any of these ratings!

The Brushless 16 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. It allows for both 3.3V and 5V capable MCUs to use the communication lines properly. Additionally, there is a possibility for LB11685AV power supply selection via jumper labeled as VFAN SEL to supply the LB11685AV from an external input terminal in the range from 4.5 to 19V or with a 5V from mikroBUS™ power rail.

Specifications

Pinout diagram

This table shows how the pinout on the Brushless 16 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	FG	Rotation Speed Indication
NC	2	RST	INT	15	RD	Motor Lock Detection
Enable	EN	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
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

Brushless 16 Click electrical specifications