LED Driver 13 Click

How does it work?

LED Driver 13 Click as its foundation uses the A80604-1, a multi-output LED driver for automotive applications designed at a switching frequency of 400kHz from Allegro Microsystems. The A80604-1 implements a current-mode boost/SEPIC converter with gate driver for onboard external N-channel MOSFET. Thus, it provides an output current of 150mA per channel at an output voltage of approximately 26V, limited by the input voltage of the A80604-1, which must be in the range of 6V to 18V for proper operation. It also has integrated protection circuitry to guard against output short, overvoltage, LED short-circuit protections, and overtemperature.

This Click board™ offers two ways to implement the LED dimming: analog dimming via an onboard potentiometer or through an external PWM signal applied on the onboard header labeled as PWM, and PWM dimming using a PWM pin from the mikroBUS™ socket. Using the patented Pre-Emptive Boost control, an LED brightness contrast ratio of 15,000:1 can be achieved using PWM dimming at 200Hz. A higher ratio of 150,000:1 is possible when using a combination of PWM and analog dimming. The analog dimming selection can be made by positioning the SMD jumper labeled as ADIM SEL to an appropriate position marked as POT or PWM.

The switching frequency of the A80604-1 can be externally synchronized to an external clock or generated internally – programmed between 260kHz and 2.3MHz. The spread-spectrum technique (with user-programmable dithering range and modulation frequency) is provided to reduce EMI. A clock-out signal, available on the onboard header labeled CLKO, allows other converters to be synchronized to the switching frequency of A80604-1.

As mentioned in the product description, LED Driver 13 Click communicates with MCU using several GPIO pins. The Enable pin, labeled as EN and routed to the CS pin of the mikroBUS™ socket, optimizes power consumption used for power ON/OFF purposes of the board. In addition, it also uses a fault pin labeled as FLT and routed to the INT pin of the mikroBUS™ socket, which indicates the previously mentioned fault conditions to an external system if any fault occurs during operation. This fault signal is also visually indicated via a red LED labeled FAULT. Once the fault is removed, the soft-start process will continue.

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

Pinout diagram

This table shows how the pinout on LED Driver 13 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	PWM	PWM Signal
	NC	2	RST	INT	15	FLT	Fault Indicator
Enable	EN	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	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

LED Driver 13 Click electrical specifications

Software Support

We provide a library for the LED Driver 13 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for LED Driver 13 Click driver.

Key functions

• leddriver13_set_enable LED Driver 13 set enable function.

• leddriver13_pwm_start LED Driver 13 start PWM module.

• leddriver13_set_duty_cycle LED Driver 13 sets PWM duty cycle.

Example Description

This library contains API for LED Driver 13 Click driver.

  void application_task ( void )  
 { 
     static int8_t duty_cnt = 1; 
     static int8_t duty_inc = 1; 
     float duty = duty_cnt / 1000.0; 

     leddriver13_set_duty_cycle ( &leddriver13, duty ); 
     log_printf( &logger, "> Duty: %.1f%%rn", duty * 100 ); 
     Delay_ms( 100 ); 

     if ( 30 == duty_cnt )  
     { 
         duty_inc = -1; 
     } 
     else if ( 0 == duty_cnt )  
     { 
         duty_inc = 1; 
     } 
     duty_cnt += duty_inc; 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.LEDDriver13

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 MikroElektronika compilers.

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.