DIGI POT 13 click

DIGI POT 13 Click is a compact add-on board that contains a digitally controlled potentiometer. This board features the MAX5419, a 256-tap non-volatile digital potentiometer from Analog Devices. On this Click board™, one digitally I2C-controlled potentiometer is realized with typical end-to-end resistance values of 200kΩ. It can operate from both 3.3V and 5V power supplies and provides a low 35ppm/ºC end-to-end nominal resistance temperature coefficient and only 5ppm/ºC ratiometric.

click Product page

Click library

• Author : Nenad Filipovic
• Date : May 2023.
• Type : I2C type

Software Support

We provide a library for the DIGI POT 13 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 DIGI POT 13 Click driver.

Standard key functions :

• digipot13_cfg_setup Config Object Initialization function.

  void digipot13_cfg_setup ( digipot13_cfg_t *cfg );

• digipot13_init Initialization function.

  err_t digipot13_init ( digipot13_t *ctx, digipot13_cfg_t *cfg );

• digipot13_default_cfg Click Default Configuration function.

  err_t digipot13_default_cfg ( digipot13_t *ctx );

Example key functions :

• digipot13_set_resistance DIGI POT 13 set the resistance function.

  err_t digipot13_set_resistance ( digipot13_t *ctx, digipot13_cfg_res_t cfg_res, float res_kohm );

• digipot13_set_wiper_pos DIGI POT 13 set the wiper position function.

  err_t digipot13_set_wiper_pos ( digipot13_t *ctx, uint8_t wiper_pos );

• digipot13_write_data DIGI POT 13 write data function.

  err_t digipot13_write_data ( digipot13_t *ctx, uint8_t cmd, uint8_t data_in );

Example Description

This library contains API for DIGI POT 13 Click driver. The demo application uses a digital potentiometer to change the resistance values.

The demo application is composed of two sections :

Application Init

The initialization of I2C module, log UART, and additional pins. After the driver init, the app executes a default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    digipot13_cfg_t digipot13_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.
    digipot13_cfg_setup( &digipot13_cfg );
    DIGIPOT13_MAP_MIKROBUS( digipot13_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == digipot13_init( &digipot13, &digipot13_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( DIGIPOT13_ERROR == digipot13_default_cfg ( &digipot13 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, " ----------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

This example demonstrates the use of the DIGI POT 13 Click board™. The demo application iterates through the entire wiper range and sets the resistance in steps of approximately 50 kOhm. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    for ( uint8_t res_kohm = DIGIPOT13_RES_0_KOHM; res_kohm <= DIGIPOT13_RES_200_KOHM; res_kohm += DIGIPOT13_RES_50_KOHM )
    {
        if ( DIGIPOT13_OK == digipot13_set_resistance( &digipot13, DIGIPOT13_CFG_RES_WH, ( float ) res_kohm ) )
        {
            log_printf( &logger, " Resistance: %.1f kOhm\r\n", ( float ) res_kohm );
            log_printf( &logger, " ----------------------------\r\n" );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            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.DIGIPOT13

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.