DIGI POT 14 Click

DIGI POT 14 Click is a compact add-on board that contains a digitally controlled potentiometer. This board features the TPL0102, a dual-channel digital potentiometer with non-volatile memory from Texas Instruments. It is a 100K resistance end-to-end potentiometer with a 256-position resolution, where the wiper position can be stored in EEPROM. It can operate from both 3.3V and 5V power supplies and provides a typical 92ppm/ºC end-to-end nominal resistance temperature coefficient and only 4ppm/ºC ratiometric.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Aug 2023.
• Type : I2C type

Software Support

We provide a library for the DIGI POT 14 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 14 Click driver.

Standard key functions :

• digipot14_cfg_setup Config Object Initialization function.

  void digipot14_cfg_setup ( digipot14_cfg_t *cfg );

• digipot14_init Initialization function.

  err_t digipot14_init ( digipot14_t *ctx, digipot14_cfg_t *cfg );

• digipot14_default_cfg Click Default Configuration function.

  err_t digipot14_default_cfg ( digipot14_t *ctx );

Example key functions :

• digipot14_reg_write DIGI POT 14 register write function.

  err_t digipot14_reg_write ( digipot14_t *ctx, uint8_t reg, uint8_t data_in );

• digipot14_set_pot_a_wiper DIGI POT 14 set the wiper position of potentiometer A function.

  err_t digipot14_set_pot_a_wiper ( digipot14_t *ctx, uint8_t wiper_pos );

• digipot14_set_pot_b_wiper DIGI POT 14 set the wiper position of potentiometer B function.

  err_t digipot14_set_pot_b_wiper ( digipot14_t *ctx, uint8_t wiper_pos );

Example Description

This library contains API for DIGI POT 14 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. */
    digipot14_cfg_t digipot14_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.
    digipot14_cfg_setup( &digipot14_cfg );
    DIGIPOT14_MAP_MIKROBUS( digipot14_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == digipot14_init( &digipot14, &digipot14_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( DIGIPOT14_ERROR == digipot14_default_cfg ( &digipot14 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

This example demonstrates the use of the DIGI POT 14 Click board™. The demo application iterates through the entire wiper range. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    for ( uint8_t wiper_val = DIGIPOT14_MIN_POSITION; wiper_val <= DIGIPOT14_MAX_POSITION; wiper_val++ )
    {

        digipot14_set_pot_a_wiper( &digipot14, wiper_val );
        digipot14_set_pot_b_wiper( &digipot14, wiper_val );
        log_printf( &logger, " Resistance = %.3f KOhm \r\n", 
                    ( DIGIPOT14_MAX_RESISTANCE_KOHM * ( wiper_val / DIGIPOT14_MAX_POSITION_NUM ) ) );
        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.DIGIPOT14

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.