Mikroelektronika d.o.o.
I2C Isolator 4 Click Board
I2C Isolator 4 Click Board
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Key Features
- Robust galvanic isolation of digital signals, withstands 5kVRMS for 60s, low power consumption, supports I2C clock stretching, glitch-free operation, excellent reliability, long operational life, and more
- Based on the MAX14937 - two-channel I2C digital isolator from Analog Devices
- Can be used for transferring digital signals between circuits with different power domains
- mikroBUS: I2C Interface
Overview
The I2C Isolator 4 Click Board™ is a compact add-on board that offers completely isolated bidirectional communication. This board features the MAX14937, a two-channel, 5kVRMS I2C digital isolator from Analog Devices. The MAX14937 provides two bidirectional, open-drain channels for applications that require data to be transmitted in both directions on the same line. It supports data rates from DC up to 1.7MHz and can be used in isolated I2C busses with or without clock stretching. This Click board™ is suitable for transferring digital signals between circuits with different power domains at ambient temperatures.
The I2C Isolator 4 Click Board™ is supported by a mikroSDK-compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
How Does The I2C Isolator 4 Click Board™ Work?
The I2C Isolator 4 Click Board™ 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 the 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.
The I2C Isolator 4 Click Board™ also possesses two terminals labelled as VIN and SDA/SCL at the bottom of the Click board™, where VIN represents the B-side power supply of the isolator. At the same time, 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, it is allowed for both 3.3V and 5V capable MCUs to 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
| Type | I2C,Isolators |
| Applications | Can be used for transferring digital signals between circuits with different power domains |
| On-board modules | MAX14937 - two-channel I2C digital isolator from Analog Devices |
| Key Features | Robust galvanic isolation of digital signals, withstands 5kVRMS for 60s, low power consumption, supports I2C clock stretching, glitch-free operation, excellent reliability, long operational life, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the I2C Isolator 4 Click Board™ 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
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
I2C ISOLATOR 4 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Maximum Withstand Isolation Voltage | - | - | 5000 | Vrms |
| Maximum Frequency | - | - | 1.7 | MHz |
| Data Rate | - | - | 1.6 | Mbps |
Software Support
Software Support
We provide a library for the II2C Isolator 4 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on the MikroE Github account.
Library Description
This library contains API for the I2C Isolator 4 Click Board™ driver.
Key functions
-
i2cisolator4_generic_writeI2C Isolator 4 I2C writing function. -
i2cisolator4_generic_readI2C Isolator 4 I2C reading function. -
i2cisolator4_set_slave_addressI2C Isolator 4 set I2C Slave address function.
Example Description
This library contains API for the I2C Isolator 4 Click Board™ driver. This demo application shows an example of an I2C Isolator 4 Click Board™ wired to the VAV Press Click Board™ 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 The 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 Information
Depending on the development board you are using, you may need USB UART Click Board™, 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.
MIKROSDK
The I2C Isolator 4 Click Board™ is supported with mikroSDK - MikroElektronika 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.
Software Support
Software Support
We provide a library for the II2C Isolator 4 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on the MikroE Github account.
Library Description
This library contains API for the I2C Isolator 4 Click Board™ driver.
Key functions
-
i2cisolator4_generic_writeI2C Isolator 4 I2C writing function. -
i2cisolator4_generic_readI2C Isolator 4 I2C reading function. -
i2cisolator4_set_slave_addressI2C Isolator 4 set I2C Slave address function.
Example Description
This library contains API for the I2C Isolator 4 Click Board™ driver. This demo application shows an example of an I2C Isolator 4 Click Board™ wired to the VAV Press Click Board™ 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 The 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 Information
Depending on the development board you are using, you may need USB UART Click Board™, 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.
MIKROSDK
The I2C Isolator 4 Click Board™ is supported with mikroSDK - MikroElektronika 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.
Frequently Asked Questions
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