Haptic 2 Click Board

Product Description

How Does The Haptic 2 Click Board™Work?

The Haptic 2 Click Board™ as its foundation uses the LC898302AXA, a linear vibration motor driver dedicated to LRA (Linear Resonant Actuator) and ERM (Eccentric Rotating Mass) applications from ON Semiconductor. The original driving waveform enables low power consumption, and it is helpful to maintain battery lifetime. It allows crisp vibration thanks to automatic braking and over-driving feature. The drive frequency automatically adjusts to the resonance frequency of the linear vibrator without the use of other external parts.

As a result of this very effective drive, the vibration is as powerful as possible using minimal energy compared to classical solutions. It also ignores the deviation of resonance frequency thanks to auto-tuning function. This function can increase the perceived vibration force by over 20%, making it far more efficient than conventional haptic driving solutions. They require minimal power but can maintain a high level of vibration.

The LRA motors rely on a magnet attached to the case by a spring where a magnetic field from the coil causes vibration activity initiation. Compared to ERM, the LRA have better responsiveness improving system performance. The ERM type of haptic motor causes the off-balance mass to rotate. The mass movement results in an asymmetric centripetal force, leading to the motor’s displacement. Using ERM motor, ERM driving voltage can be adjusted through an adjustment resistor connected between OUT1 pin of Click board terminal and ERM motor pin.

The Haptic 2 Click Board™ operates only with the PWM signal from the mikroBUS™ socket that drives the LC898302AXA and offers fully configurable drive and brake functions. Also, it has a jumper setting labelled as MODE SEL used to choose between LRA or ERM motor to drive.

The Haptic 2 Click Board™ can operate only with a 3.3V logic voltage. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the Haptic 2 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	PWM	PWM Signal
NC	2	RST	INT	15	NC
NC	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	NC
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

HAPTIC 2 CLICK ELECTRICAL SPECIFICATIONS

Software Support

void application_task ( void ) {
    //  Task implementation.
    log_printf( &logger, "--------------------------rn" );
    
    for ( float duty = 0.1; duty < 0.9; duty += 0.1 ) {
        Delay_ms( 500 );
        haptic2_set_duty_cycle ( &haptic2, duty );
        log_printf( &logger, "   PWM duty cycle : %.1f rn", duty );
    }

    Delay_ms( 1000 );

    for ( float duty = 0.8; duty >= 0; duty -= 0.1 ) {
        Delay_ms( 500 );
        haptic2_set_duty_cycle ( &haptic2, duty );
        log_printf( &logger, "   PWM duty cycle : %.1f rn", duty );
    }

    Delay_ms( 1000 );
}

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