Charger 18 Click

Charger 18 Click is a compact add-on board representing a single-cell battery charger. This board features the LTC3553, a micropower, highly integrated power management, and battery charger for single-cell Li-Ion/Polymer battery applications from Analog Devices. Designed specifically for USB applications, it also includes a PowerPath manager with automatic load prioritization and input current limit, a battery charger, and numerous internal protection features. It also indicates a battery charge state, and it comes with a synchronous 200mA buck regulator and a 150mA low dropout linear regulator (LDO).

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Dec 2021.
• Type : GPIO type

Software Support

We provide a library for the Charger 18 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 Charger 18 Click driver.

Standard key functions :

• charger18_cfg_setup Config Object Initialization function.

  void charger18_cfg_setup ( charger18_cfg_t *cfg );

• charger18_init Initialization function.

  err_t charger18_init ( charger18_t *ctx, charger18_cfg_t *cfg );

Example key functions :

• charger18_buck_control This function controls the buck regulator enable state of Charger 18 Click board.

  void charger18_buck_control ( charger18_t *ctx, uint8_t state ); 

• charger18_ldo_control This function controls the low dropout (LDO) regulator enable state of Charger 18 Click board.

  void charger18_ldo_control ( charger18_t *ctx, uint8_t state );

• charger18_suspend_control This function controls the suspend charging mode state of Charger 18 Click board.

  void charger18_suspend_control ( charger18_t *ctx, uint8_t state ); 

Example Description

This example demonstrates the use of Charger 18 Click board by controlling the status of the charger as well as the LDO and BUCK regulators.

The demo application is composed of two sections :

Application Init

Initializes the driver and enables the chip with the charger, LDO and BUCK regulators disabled.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    charger18_cfg_t charger18_cfg;  /**< Click config object. */

    /** 
     * 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 " );

    // Click initialization.
    charger18_cfg_setup( &charger18_cfg );
    CHARGER18_MAP_MIKROBUS( charger18_cfg, MIKROBUS_1 );
    if ( DIGITAL_OUT_UNSUPPORTED_PIN == charger18_init( &charger18, &charger18_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    charger18_power_control( &charger18, CHARGER18_CONTROL_ENABLE );
    log_printf( &logger, " POWER   : ON\r\n" );
    charger18_suspend_control( &charger18, CHARGER18_CONTROL_ENABLE );
    log_printf( &logger, " CHARGER : OFF\r\n" );
    charger18_buck_control( &charger18, CHARGER18_CONTROL_DISABLE );
    log_printf( &logger, " BUCK    : OFF\r\n" );
    charger18_ldo_control( &charger18, CHARGER18_CONTROL_DISABLE );
    log_printf( &logger, " LDO     : OFF\r\n" );

    log_info( &logger, " Application Task " );
}

Application Task

This function enables the charger, BUCK and LDO in the span of 25 seconds, and displays the status of each feature on the USB UART.

void application_task ( void )
{
    charger18_suspend_control( &charger18, CHARGER18_CONTROL_DISABLE );
    log_printf( &logger, " CHARGER : ON\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    charger18_suspend_control( &charger18, CHARGER18_CONTROL_ENABLE );
    log_printf( &logger, " CHARGER : OFF\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    charger18_buck_control( &charger18, CHARGER18_CONTROL_ENABLE );
    log_printf( &logger, " BUCK    : ON\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    charger18_buck_control( &charger18, CHARGER18_CONTROL_DISABLE );
    log_printf( &logger, " BUCK    : OFF\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    charger18_ldo_control( &charger18, CHARGER18_CONTROL_ENABLE );
    log_printf( &logger, " LDO     : ON\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    charger18_ldo_control( &charger18, CHARGER18_CONTROL_DISABLE );
    log_printf( &logger, " LDO     : OFF\r\n\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

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.Charger18

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. UART terminal is available in all MikroElektronika compilers.