I2C Isolator 5 Click

I2C Isolator 5 Click is a compact add-on board that offers completely isolated bidirectional communication. This board features ISO1644, a hot-swappable bidirectional I2C isolator with enhanced EMC and GPIOs from Texas Instruments. The ISO1644 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.

Click Product page

Click library

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

Software Support

We provide a library for the I2C Isolator 5 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 5 Click driver.

Standard key functions :

• i2cisolator5_cfg_setup Config Object Initialization function.

  void i2cisolator5_cfg_setup ( i2cisolator5_cfg_t *cfg );

• i2cisolator5_init Initialization function.

  err_t i2cisolator5_init ( i2cisolator5_t *ctx, i2cisolator5_cfg_t *cfg );

Example key functions :

• i2cisolator5_set_slave_address I2C Isolator 5 set I2C Slave address function.

  err_t i2cisolator5_set_slave_address ( i2cisolator5_t *ctx, uint8_t address );

• i2cisolator5_set_outa_state I2C Isolator 5 set output A state function.

  void i2cisolator5_set_outa_state ( i2cisolator5_t *ctx, uint8_t outa_state );

• i2cisolator5_get_ina_state I2C Isolator 5 get input A state function.

  uint8_t i2cisolator5_get_ina_state ( i2cisolator5_t *ctx );

Example Description

This library contains API for the I2C Isolator 5 Click driver. This demo application shows an example of an I2C Isolator 5 Click wired to the VAV Press Click for reading differential pressure and temperature measurement.

The demo application is composed of two sections :

Application Init

Initialization of I2C module and log UART. After driver initialization and default settings, the app set VAV Press Click I2C slave address ( 0x5C ) and enable device.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    i2cisolator5_cfg_t i2cisolator5_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.
    i2cisolator5_cfg_setup( &i2cisolator5_cfg );
    I2CISOLATOR5_MAP_MIKROBUS( i2cisolator5_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == i2cisolator5_init( &i2cisolator5, &i2cisolator5_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_printf( &logger, " Set VAV Press Click I2C Slave Address \r\n" );
    i2cisolator5_set_slave_address ( &i2cisolator5, I2CISOLATOR5_VAV_PRESS_DEV_ADDR );
    Delay_ms ( 100 );

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

Application Task

This is an example that shows the use of an I2C Isolator 5 Click board™. Logs pressure difference [ Pa ] and temperature [ degree Celsius ] values of the VAV Press Click written to the I2C Isolator 5 Click board™.
Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( void ) 
{
    if ( I2CISOLATOR5_OK == i2cisolator5_get_press_and_temp( ) )
    {
        log_printf( &logger, " Diff. Pressure : %.4f Pa \r\n", diff_press );
        log_printf( &logger, " Temperature : %.2f C \r\n", temperature );
        log_printf( &logger, "--------------------------------\r\n" );
    }

    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.I2CIsolator5

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.