UT-L 7-SEG R Click

How does it work?

UT-L 7-SEG R Click is based on two red JSS-5611BUB-21s, ultra-thin single-digit numeric displays from Ningbo Junsheng Electronics. This high-intensity and reliable blue source color device is made with Indium-Gallium-Nitride light-emitting diode conducting material. It features low current operation, high light output, excellent character appearance, and is mechanically rugged. The display can work on 5V and 3.3V and has a common anode as its internal design. It consists of seven red LED segments that form an 8 number and the eighth segment as a decimal point, or DP.

The communication between the host MCU and the UT-L 7-SEG R Click is established via an industry-standard shift-register-plus-latch-type serial interface and the MAX6969, 16-port constant-current LED driver from Analog Devices. This driver has a 4-wire serial interface using four inputs and a data output. The output-enable input (OE) gates to all 16 outputs ON and OFF and is fast enough to be used as a PWM input for LED intensity control. The constant-current outputs are programmed together to around 15mA using a single external resistor.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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 UT-L 7-SEG R 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	OE	Output Enable
	NC	2	RST	INT	15	NC
SPI Chip Select	LE	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	NC
SPI Data IN	SDI	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

UT-L 7-SEG R Click electrical specifications

Software Support

We provide a library for the UT-L 7-SEG R 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 UT-L 7-SEG R Click driver.

Key functions

• utl7segr_generic_write This function writes a desired number of data bytes starting from the selected register by using SPI serial interface.

• utl7segr_display_state This function turns display on and off.

• utl7segr_display_number This function is used to show the number on the display.

Example Description

The demo application shows basic usage of the UT 7 SEG display.

 void application_task ( void ) {   
     log_info( &logger, "---- Number counter ----" ); 

     for ( uint8_t cnt = 0; cnt < 100; cnt++ ) { 
         utl7segr_display_number( &utl7segr, cnt, UTL7SEGR_DOT_LEFT ); 
         Delay_ms( 500 ); 
     } 
 }

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.UT-L7-SEGR

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.