How does it work?

I2C Isolator Click is based on the ISO1540, a 2.5kVrms I2C digital isolator from Texas Instruments. The ISO1540 enables a completely isolated I2C interface, supporting Fast Mode Plus up to 1MHz, with two isolated bidirectional channels for clock and data lines. It provides advantages such as performance, size, and power consumption compared to optocouplers, which makes it suitable for multi-master and applications where slave clock stretching is possible. Isolated bidirectional communication is accomplished by offsetting the low-level output voltage on the MCU side to a value greater than its high-level input voltage, preventing an internal logic latch that would occur with standard digital isolators.

The ISO1540 has logic input and output buffers separated by Texas Instruments Capacitive Isolation technology using a silicon dioxide (SiO2) barrier. Also, the ISO1540 internally splits a bidirectional line into two unidirectional lines, each isolated through a single-channel digital isolator. This way, each channel output is made open-drain to comply with the open-drain technology of I2C. When used with isolated power supplies, the ISO1540 blocks high voltages, isolates grounds and prevents noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

This Click board™ can operate on both 3.3V and 5V logic voltage levels selected via the VCC1 SEL jumper. Therefore, both 3.3V and 5V capable MCUs to use the communication lines properly. The Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on I2C Isolator Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Onboard settings and indicators

I2C Isolator Click electrical specifications

Software Support

We provide a library for the I2C isolator Click as well as a demo application (example), developed using Mikroe . The demo can run on all the main Mikroe .

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our or found on .

Library Description

This library contains API for I2C isolator Click driver.

Key functions

• Generic write function.

• Generic read function.

Example Description

This is an example which demonstrates the use of I2C Isolator Click board.

 void application_task ( void ) 
 { 
     i2cisolator_get_temperature( );    

     log_printf( &logger, " Temperature : %0.2f Crn", temperature ); 
     log_printf( &logger, "---------------------------rn" ); 
     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our or found on .

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.I2Cisolator

Additional notes and informations

Depending on the development board you are using, you may need , or to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroe .

mikroSDK

This Click board™ is supported with - Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the and installed for the compiler you are using.

For more information about mikroSDK, visit the .