Buck 22 Click

Buck 22 Click is a compact add-on board that steps down the voltage from its input (supply) to its output (load). This board features the TPS62869, a high-frequency synchronous step-down converter with an I2C interface from Texas Instruments, providing an efficient, adaptive, and high power-density solution. The TPS62869 operates in PWM mode at medium to heavy loads (also for the slightest output voltage ripple), and it automatically enters Power-Save Mode operation at light load to maintain high efficiency over the entire output load current range. With its DCS-Control™ architecture, excellent load transient performance and tight output voltage accuracy are achieved alongside adjustable output voltage range from 0.8V to 3.35V with a 10mV step size.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Oct 2022.
• Type : I2C type

Software Support

We provide a library for the Buck 22 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 Buck 22 Click driver.

Standard key functions :

• buck22_cfg_setup Config Object Initialization function.

  void buck22_cfg_setup ( buck22_cfg_t *cfg );

• buck22_init Initialization function.

  err_t buck22_init ( buck22_t *ctx, buck22_cfg_t *cfg );

Example key functions :

• buck22_set_vout This function sets the output voltage by using I2C serial interface.

  err_t buck22_set_vout ( buck22_t *ctx, uint16_t vout_mv );

• buck22_read_vout This function reads the output voltage by using I2C serial interface.

  err_t buck22_read_vout ( buck22_t *ctx, uint16_t *vout_mv );

• buck22_get_pg_pin This function returns the power good (PG) pin logic state.

  uint8_t buck22_get_pg_pin ( buck22_t *ctx );

Example Description

This example demonstrates the use of Buck 22 Click by changing the output voltage.

The demo application is composed of two sections :

Application Init

Initializes the driver and sets the control settings.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    buck22_cfg_t buck22_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.
    buck22_cfg_setup( &buck22_cfg );
    BUCK22_MAP_MIKROBUS( buck22_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == buck22_init( &buck22, &buck22_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( BUCK22_ERROR == buck22_set_control ( &buck22, BUCK22_CONTROL_DEFAULT_SETTING ) )
    {
        log_error( &logger, " Set control." );
        for ( ; ; );
    }

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

Application Task

Changes the output voltage every 3 seconds and displays on the USB UART the currently set voltage output value. It also checks the power good pin indicator.

void application_task ( void )
{
    if ( !buck22_get_pg_pin ( &buck22 ) )
    {
        log_info ( &logger, " Device is shut down. " );
        while ( !buck22_get_pg_pin ( &buck22 ) );
        log_info ( &logger, " Device is powered up. " );
    }
    static uint16_t vout_mv = BUCK22_VOUT_MIN;
    if ( BUCK22_OK == buck22_set_vout ( &buck22, vout_mv ) )
    {
        if ( BUCK22_OK == buck22_read_vout ( &buck22, &vout_mv ) )
        {
            log_printf ( &logger, " Vout: %u mV\r\n", vout_mv );
        }
    }
    vout_mv += 100;
    if ( vout_mv > BUCK22_VOUT_MAX )
    {
        vout_mv = BUCK22_VOUT_MIN;
    }
    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.Buck22

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.