IrDA 4 Click

How does it work?

IrDA 4 Click is based on the TFBS4650, an infrared transceiver from Vishay Semiconductors. It is a low-power consumption device with a standard IrDA link distance of 1m. At this distance, the transceiver supports data rates up to 115kbit/s per the IrDA standard. The MCP2122 encodes an asynchronous serial data stream, converting each data bit to the corresponding Infrared (IR) formatted pulse, with received IR pulses decoded back into the corresponding UART formatted serial data. The combination of the MCP2122 and TFBS4650 results in fast and stable infrared data communication covering the full IrDA range in distance and speed.

To communicate with the host MCU, IrDA 4 Click uses MCP2122 and its onboard clock generator for the fastest possible UART performance of 115.200 bps, so it does not need an additional clock signal to be generated by the MCU. The RST pin of the mikroBUS™ socket can reset the MCP2122, while the SD pin with an active HIGH logic state can be used to put the TFBS4650 into a Shutdown state.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL V1 jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Apart from the V1 jumper, there are two more: V2 and V3. The V2 jumper serves as the main power supply of the TFBS4650, while the V3 jumper allows you to set the voltage specifically for its IRED anode. Each of these positions can be selected independently, allowing you the flexibility to choose the configuration that best suits your requirements. 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 IrDA 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	SD	Shutdown
Reset	RST	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

IrDA 4 Click electrical specifications

Software Support

We provide a library for the IrDA 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 IrDA 4 Click driver.

Key functions

• irda4_generic_write IrDA 4 data writing function.

• irda4_generic_read IrDA 4 data reading function.

• irda_hw_reset IrDA 4 hardware reset function.

Example Description

This example demonstrates the use of IrDA 4 Click board™ by processing the incoming data and displaying them on the USB UART.

void application_task ( void )  
 { 
#if defined( DEMO_APP_TRANSMITTER )
    for ( uint8_t n_cnt = 0; n_cnt < 8; n_cnt++ )
    {
        irda4_generic_write( &irda4, &tx_message[ n_cnt ], 1 );
        Delay_ms( 500 );
    }
    log_printf( &logger, "Message sent rn" );
#else
    if ( 1 == irda4_generic_read( &irda4, &rx_message, 1 ) )
    {
        log_printf( &logger, "%c", rx_message );
    }
#endif
 }

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.IrDA4

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.