Get ahead of the competition by integrating an advanced audio amplifier into your embedded solution
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Hardware Overview
How does it work?
StereoAmp Click is based on two LM48100Qs, Boomer mono audio power amplifiers with output fault detection and volume control from Texas Instruments. The inputs of the amplifiers can be mixed/multiplexed to the device’s outputs. Each input has its own independent 32-step volume control. Each amplifier has short circuit and thermal protection, advanced click-and-pop suppression, and high PSRR. The StereoAmp Click features a 3.5mm audio jack as input and two pairs of screw terminals as output for connecting passive speakers. Each amplifier is used for one channel, left or right. The amplifiers are designed to drive a load differentially, a configuration better known as a bridge-tied load (BTL). BTL is an output configuration where the speakers are
connected (bridged) between two audio amplifier outputs. In a single-ended configuration, one side of the load is connected to the ground. Here both channels are connected, but one has an inverted signal. Compared to a single-ended configuration, BTL has two times more voltage swing across the load (speakers). The doubled voltage swing means four times more power to the speakers. This is ideal for applications and devices with lower supply voltage due to battery size. The output fault detection system can sense load conditions, protect the device during short circuit events, and detect open circuit conditions. The LM48100Q-Q1 output fault diagnostics are controlled through the I2C interface. In addition, the IC has an I2C selectable low-power shutdown mode that turns
off the device, reducing current consumption to 0.01μA. The StereoAmp Click uses the standard write-only 2-Wire I2C interface to communicate with the host MCU, supporting clock rates up to 400KHz. There are two fault detection pins, labeled FLL and FLR, according to a left or right channel. Those pins will go logic LOW if the fault condition occurs. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR 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.
Features overview
Development board
Flip&Click PIC32MZ is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC32MZ microcontroller, the PIC32MZ2048EFH100 from Microchip, four mikroBUS™ sockets for Click board™ connectivity, two USB connectors, LED indicators, buttons, debugger/programmer connectors, and two headers compatible with Arduino-UNO pinout. Thanks to innovative manufacturing technology,
it allows you to build gadgets with unique functionalities and features quickly. Each part of the Flip&Click PIC32MZ development kit contains the components necessary for the most efficient operation of the same board. In addition, there is the possibility of choosing the Flip&Click PIC32MZ programming method, using the chipKIT bootloader (Arduino-style development environment) or our USB HID bootloader using mikroC, mikroBasic, and mikroPascal for PIC32. This kit includes a clean and regulated power supply block through the USB Type-C (USB-C) connector. All communication
methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, user-configurable buttons, and LED indicators. Flip&Click PIC32MZ development kit allows you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Track your results in real time
Application Output
After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.
After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.
Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.
Software Support
Library Description
This library contains API for StereoAmp Click driver.
Key functions:
stereoamp_set_power_on
- This function set the power On of both channels by write to the Mode Control register address of LM48100Q-Q1 chip on StereoAmp Clickstereoamp_set_volume
- This function set the volume of both channels to the Volume Control register address of LM48100Q-Q1 chip on StereoAmp Click
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* \file
* \brief StereoAmp Click example
*
* # Description
* This is an example which demonstrates the use of StereoAmp Click board -
* stereo amplifier and is ideal for battery operated devices or as a lab amplifier.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Application Init performs Logger and Click initialization.
*
* ## Application Task
* This examples first set volume level 20 of 31 ( gain: 1,5 dB ) for 10 seconds.
* After that, we increase the volume to level 10 ( gain: -13,5 dB ) for the next 10 seconds.
* Results are being sent to the UART Terminal where you can track their changes.
*
* \author Mihajlo Djordjevic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "stereoamp.h"
// ------------------------------------------------------------------ VARIABLES
static stereoamp_t stereoamp;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
stereoamp_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
Delay_ms ( 500 );
// Click initialization.
stereoamp_cfg_setup( &cfg );
STEREOAMP_MAP_MIKROBUS( cfg, MIKROBUS_1 );
stereoamp_init( &stereoamp, &cfg );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " --- StereoAmp Click --- \r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms ( 1000 );
stereoamp_default_cfg( &stereoamp );
Delay_ms ( 1000 );
log_printf( &logger, " Power On \r\n" );
stereoamp_set_power_on( &stereoamp );
Delay_ms ( 500 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " Set Volume: -80dB \r\n" );
stereoamp_set_volume( &stereoamp, STEREOAMP_GAIN_NEG_80dB );
Delay_ms ( 500 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " Enable Fault \r\n" );
stereoamp_enable_fault( &stereoamp );
Delay_ms ( 500 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " Enable Diagnostic \r\n" );
stereoamp_enable_diagnostic( &stereoamp );
Delay_ms ( 500 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " -- Initialization done --\r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms ( 500 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " ----- Play Music ----- \r\n" );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms ( 500 );
}
void application_task ( void )
{
log_printf( &logger, " Gain 1.5 dB \r\n" );
stereoamp_set_volume( &stereoamp, STEREOAMP_GAIN_1_5dB );
Delay_ms ( 10000 );
log_printf( &logger, "--------------------------\r\n" );
log_printf( &logger, " Gain -13.5 dB \r\n" );
stereoamp_set_volume( &stereoamp, STEREOAMP_GAIN_NEG_13_5dB );
Delay_ms ( 10000 );
log_printf( &logger, "--------------------------\r\n" );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END