I2C Isolator 6 Click

I2C Isolator 6 Click is a compact add-on board that offers completely isolated bidirectional communication. This board features the ADUM2250, a two-channel, 5kVRMS I2C digital isolator from Analog Devices. The ADUM2250 provides two bidirectional channels, supporting a completely isolated I2C interface that eliminates the need for splitting I2C signals into separate transmit and receive signals for use with standalone optocouplers. It supports data rates from DC up to 1MHz and has a hot swap circuitry to prevent data glitches.

Click Product page

Click library

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

Software Support

We provide a library for the I2C Isolator 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 I2C Isolator 6 Click driver.

Standard key functions :

• i2cisolator6_cfg_setup Config Object Initialization function.

  void i2cisolator6_cfg_setup ( i2cisolator6_cfg_t *cfg );

• i2cisolator6_init Initialization function.

  err_t i2cisolator6_init ( i2cisolator6_t *ctx, i2cisolator6_cfg_t *cfg );

Example key functions :

• i2cisolator6_write I2C Isolator 6 I2C writing function.

  err_t i2cisolator6_write ( i2cisolator6_t *ctx, uint8_t *data_in, uint8_t len );

• i2cisolator6_read I2C Isolator 6 I2C reading function.

  err_t i2cisolator6_read ( i2cisolator6_t *ctx, uint8_t *data_out, uint8_t len );

• i2cisolator6_write_then_read I2C Isolator 6 I2C write then read function.

  err_t i2cisolator6_write_then_read ( i2cisolator6_t *ctx, uint8_t *data_in, uint8_t len_write_data, uint8_t *data_out, uint8_t len_read_data );

Example Description

This library contains API for the I2C Isolator 6 Click driver. This demo application shows an example of an I2C Isolator 6 Click wired to the Accel 21 Click for reading device ID. The library also includes an I2C writing and reading functions.

The demo application is composed of two sections :

Application Init

The initialization of the I2C module, log UART. After the driver init, the app sets Accel 21 Click I2C Slave address.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2cisolator6_cfg_t i2cisolator6_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.
    i2cisolator6_cfg_setup( &i2cisolator6_cfg );
    I2CISOLATOR6_MAP_MIKROBUS( i2cisolator6_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == i2cisolator6_init( &i2cisolator6, &i2cisolator6_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    Delay_ms ( 100 );

    if ( I2CISOLATOR6_ERROR == i2cisolator6_set_slave_address( &i2cisolator6, ACCEL21_DEVICE_ADDRESS_GND ) )
    {
        log_error( &logger, " Set I2C Slave address ERROR." );
        for ( ; ; );
    }
    Delay_ms ( 100 );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "---------------------\r\n" );
}

Application Task

This example demonstrates the use of the I2C Isolator 6 Click board™. Logs device ID values of the Accel 21 Click wired to the I2C Isolator 6 Click board™.

void application_task ( void ) 
{
    static uint8_t device_id = 0;
    static uint8_t reg = ACCEL21_REG_WHO_AM_I;
    if ( I2CISOLATOR6_OK == i2cisolator6_write_then_read( &i2cisolator6, &reg, 1, &device_id, 1 ) )
    {
        if ( ACCEL21_DEVICE_ID == device_id )
        {
            log_printf( &logger, " Device ID: 0x%.2X\r\n", ( uint16_t ) device_id );
            log_printf( &logger, "---------------------\r\n" );
        }
    }
    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.I2CIsolator6

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.