8-pin I2C Click

How does it work?

8-pin I2C Click is a breakout board that simplifies the connection of add-on boards to the mikroBUS™ socket. This Click board™ represents a small-size PCB that can be connected to the mikroBUS™ socket like any other Click board™, with a 2×4 female header placed on itself. Each of the header pins is corresponding to a pin on the mikroBUS™ socket being used such as I2C lines (SCL, SDA) with two jumpers for I2C lines pull-up function selection, 3V3 power supply, and ground. This Click board™ allows easy pin access and manipulation while retaining a perfect connection quality at all times.

Being compatible with Apple’s MFI is the most important feature of the 8-pin I2C Click board™ which ensures its proper operation with additional Apple accessories. The name is a shortened version of the long-form Made for iPod, the original program that ultimately became MFI which refers to peripherals that work with Apple’s iPod, iPad, and iPhone.

8-pin I2C Click communicates with MCU using the standard I2C 2-Wire interface. Lines of the mikroBUS™ to which this Click board™ is attached, are shared through the top 8-pin female header, which mirrors the pins of the connected mikroBUS™ socket. The 8-pin I2C Click also shares the 3V3 power rails, which makes it compatible with any other power compatible Click board™ and development systems.

This Click board™ is designed to be operated only with a 3.3V logic voltage level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic voltage levels. However, the Click board™ comes equipped with a library that contains easy to use functions and a usage example that may be used as a reference for the development.

Specifications

Pinout diagram

This table shows how the pinout on 8-pin I2C 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	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Software Support

We provide a library for the 8-pin I2C Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

The library contains a basic functions for using 8 pin I2C click.

Key functions:

• void c8pini2c_i2c_write(uint8_t slave_addr, uint8_t *data_buf,uint16_t len, uint8_t end_mode) – I2C Write function
• void c8pini2c_i2c_read(uint8_t slave_addr, uint8_t *data_buf,uint16_t len, uint8_t end_mode) – I2C Read function
• void c8pini2c_i2c_start ( void ) – I2C Start function

Examples description

The application is composed of three sections :

• System Initialization – Initializes I2C module
• Application Initialization – Initializes driver init and set up another click for test
• Application Task – Reads temperature and logs on the USB UART
• NOTE: Surface temp click board used for demonstrating work 8 pin I2C click-a

void application_task ( )
{
    float temperature;
    char demo_text[ 20 ];

    temperature = surfacetemp_get_temperature( );
    FloatToStr( temperature, demo_text );
    mikrobus_logWrite( "> Temperature : ", _LOG_TEXT );
    mikrobus_logWrite( demo_text, _LOG_LINE );
    Delay_ms( 1500 );
}

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• I2C Library
• UART Library
• Conversions library

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

mikroSDK

This 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.

For more information about mikroSDK, visit the official page.