I2C Isolator 4 Click

How does it work?

I2C Isolator 4 Click is based on the MAX14937, a two-channel, 5kVRMS I2C digital isolator from Analog Devices. The MAX14937 bidirectionally buffers the two I2C signals across the isolation barrier and supports I2C clock-stretching while providing 5kVrms of galvanic isolation. It transfers digital signals between circuits with different power domains at ambient temperatures and offers glitch-free operation, excellent reliability, and a very long operational life. The wide temperature range and high isolation voltage make the device ideal for harsh industrial environments.

This Click board™ also possesses two terminals labeled as VIN and SDA/SCL at the top of the Click board™, where VIN represents the B-isolated-side power supply of the isolator, while the other corresponds to the isolated bidirectional logic-bus terminal.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V MCUs can use the communication lines properly. However, 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 4 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

I2C Isolator 4 Click electrical specifications

Software Support

We provide a library for the I2C Isolator 4 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

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

Library Description

This library contains API for I2C Isolator 4 Click driver.

Key functions

• i2cisolator4_generic_write I2C Isolator 4 I2C writing function.

• i2cisolator4_generic_read I2C Isolator 4 I2C reading function.

• i2cisolator4_set_slave_address I2C Isolator 4 set I2C Slave address function.

Example Description

This library contains API for the I2C Isolator 4 click driver. This demo application shows an example of an I2C Isolator 4 click wired to the VAV Press click for reading differential pressure and temperature measurement.

 void application_task ( void ) { 
     get_dif_press_and_temp( ); 
     log_printf( &logger, " Diff. Pressure    : %.4f Parn", diff_press ); 
     log_printf( &logger, " Temperature       : %.4f Crn", temperature ); 
     log_printf( &logger, "--------------------------------rn" ); 
     Delay_ms( 2000 ); 
 }

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

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.I2cIsolator4

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 Mikroe compilers.

mikroSDK

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

For more information about mikroSDK, visit the official page.