ISO ADC 6 Click

ISO ADC 6 Click is a compact add-on board that contains an eight-channel isolated ADC. This board features the AD7124-8, an 8-channel, low noise, low power, 24-bit, sigma-delta ADC from Analog Devices. The ADC has a programmable gain array (PGA) that allows gains of 1, 2, 4, 8, 16, 32, 64, and 128. Additionally, the ADC contains a 2.5V reference, which can be used with reference buffers, along with the externally applied references. The host MCU is isolated from the ADC by the ADuM341E, a 5kVrms quad digital isolator from Analog Devices.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Sep 2023.
• Type : SPI type

Software Support

We provide a library for the ISO ADC 6 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 ISO ADC 6 Click driver.

Standard key functions :

• isoadc6_cfg_setup Config Object Initialization function.

  void isoadc6_cfg_setup ( isoadc6_cfg_t *cfg );

• isoadc6_init Initialization function.

  err_t isoadc6_init ( isoadc6_t *ctx, isoadc6_cfg_t *cfg );

• isoadc6_default_cfg Click Default Configuration function.

  err_t isoadc6_default_cfg ( isoadc6_t *ctx );

Example key functions :

• isoadc6_get_voltage ISO ADC 6 get voltage level function.

  err_t isoadc6_get_voltage ( isoadc6_t* ctx, float *voltage );

• isoadc6_get_adc_data ISO ADC 6 get ADC data function.

  err_t isoadc6_get_adc_data ( isoadc6_t* ctx, uint32_t *adc_data );

• isoadc6_set_adc_control ISO ADC 6 set ADC control function.

  err_t isoadc6_set_adc_control ( isoadc6_t* ctx, uint16_t adc_ctrl_data );

Example Description

This example demonstrates the use of the ISO ADC 6 Click board™ by reading and writing data by using SPI serial interface and reading results of AD conversion.

The demo application is composed of two sections :

Application Init

Initialization of SPI module and log UART. After driver initialization, the app executes a default configuration which enables channel 0, puts A0 on positive analog input and A1 on negative analog input, enables internal reference voltage (approximately 2.65V (AVDD = 3.3V)), and also enables bipolar operation mode and puts device on full power mode.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    isoadc6_cfg_t isoadc6_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.
    isoadc6_cfg_setup( &isoadc6_cfg );
    ISOADC6_MAP_MIKROBUS( isoadc6_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == isoadc6_init( &isoadc6, &isoadc6_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ISOADC6_ERROR == isoadc6_default_cfg ( &isoadc6 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

The demo application reads the voltage levels from analog input (A0-A1) and displays the results. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void )
{
    float voltage = 0;
    if ( ISOADC6_OK == isoadc6_get_voltage( &isoadc6, &voltage ) )
    {
        log_printf( &logger, " Voltage: %.3f [V]\r\n", voltage );
        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.ISOADC6

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.