AudioAMP 11 Click

How does it work?

AudioAMP 11 Click is based on the NAU8224, a stereo Class-D audio amplifier from Nuvoton Technology. Besides an excellent quantity performance, such as high efficiency, the NAU8224 is also characterized by high output power and low quiescent current. It can drive a 4Ω load with up to 3.1W output power. This audio amplifier is designed to reduce high-frequency emissions with the ferrite bead filters on its outputs (speaker channels). The ferrite beads have a low impedance in the audio range, and because of that, they act as a pass-through filter in the audio frequency range. Furthermore, the NAU8224 has several protection features like thermal overload, short circuit, and supply under-voltage protection allowing a reliable operation.

This Click board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting a Fast Mode operation up to 400kHz. The NAU8224 can be enabled or disabled using the EN pin of the mikroBUS™ socket, offering a switch operation to turn ON/OFF the audio amplifier. In addition to its possible digital control, the NAU8224 also has several gain settings, such as 6dB, 12dB, 18dB, and 24dB, selectable via onboard switches labeled as GAIN SEL. This audio amplifier also provides register-programmable volume control next to the hardware gain selection.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication 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 AudioAMP 11 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	NC
Enable	EN	2	RST	INT	15	NC
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

AudioAMP 11 Click electrical specifications

Software Support

We provide a library for the AudioAMP 11 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

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

Library Description

This library contains API for AudioAMP 11 Click driver.

Key functions

• audioamp11_enable_device AudioAMP 11 enable device function.

• audioamp11_check_gain AudioAMP 11 check gain function.

• audioamp11_set_output_volume_level AudioAMP 11 set output volume level function.

Example Description

This library contains API for the AudioAMP 11 click driver. This demo application shows use of a AudioAMP 11 Click board™.

void application_task ( void )  
 { 
     uint8_t gain_level = 0; 
     uint8_t volume_level = 0; 

     audioamp11_check_gain( &audioamp11, &gain_level ); 
     log_printf( &logger, " Gain set to %d dBrn", AUDIOAMP11_CALC_GAIN_CONFIG( gain_level ) ); 

     if ( AUDIOAMP11_GAINDEC_12dB == gain_level ) 
     { 
         float volume_table[ 32 ] = { OUTPUT_VOLUME_12dB }; 
         audioamp11_set_output_volume_level( &audioamp11, vol_ctrl ); 
         Delay_ms( 100 ); 

         if ( vol_ctrl > AUDIOAMP11_GS_12dB_VOLCTRL_12dB ) 
         { 
             vol_ctrl--; 
         } 
         else 
         { 
             vol_ctrl = AUDIOAMP11_GS_12dB_VOLCTRL_m20_5dB; 
         } 

         audioamp11_get_output_volume_level( &audioamp11, &volume_level ); 
         log_printf( &logger, " Volume set to  %.1f dBrn", volume_table[ volume_level ] ); 
     } 
     else 
     { 
         audioamp11_set_output_volume_level( &audioamp11, AUDIOAMP11_VOLUME_LEVEL_31 ); 
         audioamp11_get_output_volume_level( &audioamp11, &volume_level );         
     } 

     log_printf( &logger, " Volume Level %d: ", ( uint16_t ) ( AUDIOAMP11_VOLUME_LEVEL_0 - volume_level ) ); 
     for ( uint8_t n_cnt = 0; n_cnt < ( AUDIOAMP11_VOLUME_LEVEL_0 - volume_level ); n_cnt++ ) 
     { 
         log_printf( &logger, "|" );     
     } 
     log_printf( &logger, "rn----------------------rn" ); 
     Delay_ms( 1000 ); 
 }

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

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.AudioAMP11

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. A UART terminal is available in all Mikroe compilers.

mikroSDK

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

For more information about mikroSDK, visit the official page.