Speaker Click

How does it work?

Speaker Click as its foundation uses the MAX9717, a 1.4W mono bridge-tied load (BTL) architecture audio power amplifier with a high-quality audio reproduction from Maxim Integrated. It delivers 1.4W continuous power into a 4Ω load from a single +5V supply, or 350mW continuous power into an 8Ω load while operating from a single +3.3V supply. This device features Maxim’s industry-leading, comprehensive click-and-pop suppression that reduces audible clicks and pops during Start-Up and Shutdown sequence. Output signal reproduction is possible through the onboard speaker, as well as through the headphone jack located on the bottom side of this Click board™.

Speaker Click communicates with MCU using two GPIO pins routed on the PWM and INT pins of the mikroBUS™ socket labeled B/S and PWR. The MAX9717 features a low-power shutdown mode that reduces quiescent current consumption to 10nA. Entering shutdown mode is possible through the PWR pin, which disables the bias circuitry, and forces the amplifier outputs to GND through an internal 20kΩ resistor. Driving the PWR to a low logic state will cause MAX9717 to enter shutdown mode while the high state will perform a normal operation.

As mentioned before, this Click board™ has an onboard speaker, a 20mm 4Ω Premium Micro Transducer for sound reproduction. This speaker features a neodymium-iron-boron magnet, a light aluminum cone, and a high-temperature polycarbonate frame together with low resonant frequencies and a full-range bandwidth. Also, the MAX9717 features a headphone sense input pin, labeled as B/S, that senses headphone connection to the device through a 3.5mm jack connector labeled as HEADPHONES. This feature is muting the speaker while driving the headphone as a single-ended load. An adjustable potentiometer labeled as GAIN serves to adjust the gain of the MAXS9717‘s internal amplifier.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it allows both 3.3V and 5V capable MCUs to use the GPIO lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on Speaker Click 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	B/S	Headphone Sense
	NC	2	RST	INT	15	PWR	Shutdown
	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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Software Support

We provide a library for the Speaker Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.

Library Description

This library contains API for Speaker Click driver.

Key functions:

• speaker_cfg_setup – Config Object Initialization function.
• speaker_init – Initialization function.
• speaker_default_cfg – Click Default Configuration function.

Examples description

This library contains API for the Speaker click driver. This application controls the operating modes of the Speaker click board™.

The demo application is composed of two sections :

void application_task ( void ) {
    log_printf( &logger, "-------------------------rn" );
    log_printf( &logger, "  Normal Operation Mode rn" );
    speaker_normal_operation( &speaker );
    Delay_ms( 10000 );
    
    log_printf( &logger, "-------------------------rn" );
    log_printf( &logger, "   Enter Shutdown Mode  rn" );
    speaker_shutdown( &speaker );
    Delay_ms( 10000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Speaker

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

mikroSDK

This Click board™ is supported with mikroSDK – MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.