7-SEG 2 Click

How does it work?

7-SEG 2 Click is based on the LDT-M2804RI, a three-digit seven-segment display from Lumex. The red LED segments have a common anode, a 635nm wavelength, and a luminous intensity of 5000mcd. The LED1202, a 12-channel low-quiescent current LED driver from STMicroelectronics, drives the display. The output current can be adjusted separately for each channel by a 12-bit digital dimming control. A slow turn-on and turn-off time improves the system’s low noise generation performance; moreover, the phase shifting function helps to reduce the inrush current. Eight patterns can be stored in the driver for automatic sequencing without MCU intervention.

7-SEG 2 Click uses a standard 2-wire I2C communication from the LED driver to allow the host MCU to control the seven-segment display. The I2C interface supports clock frequencies of up to 400kHz. The I2C address can be selected over the ADDR SEL jumpers. The interrupt INT pin will notify the host MCU when an interrupt event occurs. It can be an open LED detection, overtemperature protection, the pattern fault and status interrupt, the start of frame, and more.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC 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 7-SEG 2 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	INT	Interrupt
ID COMM	CS	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

7-SEG 2 Click electrical specifications

Software Support

We provide a library for the 7-SEG 2 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 7-SEG 2 Click driver.

Key functions

• c7seg2_set_segments_current This function is used to set the current value of the segment’s leds.

• c7seg2_write_segment This function is used to write a number [0..9] to a selected segment [0..2] with or w/o a decimal pointer.

• c7seg2_write_number This function is used to write a number [0..999] to a selected segment [0..2] with or w/o a decimal pointer.

Example Description

The example demonstrates the use of the 7-SEG 2 Click board™ by displaying a counter number [0.00-9.99] which is incremented by 0.01 at a desired rate.

void application_task ( void ) 
 { 
     static uint16_t counter = 0; 
     static uint16_t time = 0; 

     c7seg2_write_number( &c7seg2, counter, C7SEG2_DP_AT_SEGMENT_2 ); 

     if ( ++time >= C7SEG2_NUM_COUNTER_RATE )  
     { 
         if ( ++counter > C7SEG2_MAX_NUMBER ) 
         { 
             counter = 0; 
         } 
         time = 0; 
     } 
 }

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.7SEG2

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.