LED Driver 15 Click

How does it work?

LED Driver 15 Click is based on the MP3309C, a white LED step-up converter from Monolithic Power Systems that uses peak current mode to regulate the current through the LED string using an external low-side resistor. The MP3309C offers high efficiency and features a programmable switching frequency to optimize efficiency. It delivers up to 40mA of LED current supporting up to 8 white LEDs in series connected to the LED terminal. The MP3309C also has integrated protection circuitry to guard against thermal overstress and electrical damage featuring LED open protection, cycle-by-cycle current limit protection, under-voltage protection (UVP), and thermal shutdown protection.

The MP3309C provides two dimming methods, PWM and analog dimming mode. It uses a PWM signal from the mikroBUS™ socket for PWM dimming. When the PWM signal is in a low logic state, the MP3309C stops switching and resumes Normal operation when the PWM signal is in a high logic state. Using a 100Hz to 2kHz PWM dimming frequency for most dimming ratio requests is recommended. The MP3309C set the LED current amplitude for analog dimming through the I2C interface. LED Driver 15 Click communicates with MCU using the standard I2C 2-Wire interface that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation.

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. 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 15 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	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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

LED Driver 15 Click electrical specifications

Software Support

We provide a library for the LED Driver 15 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 LED Driver 15 Click driver.

Key functions

• leddriver15_set_i2c_dimming This function sets the LEDs dimming level in I2C mode.

• leddriver15_enable_device This function enables the device by setting the EN pin to high logic state.

• leddriver15_disable_device This function disables the device by setting the EN pin to low logic state.

Example Description

This example demonstrates the use of LED Driver 15 Click board™ by changing the LEDs dimming level.

void application_task ( void ) 
 { 
     static uint8_t dimming = LEDDRIVER15_I2C_DIMMING_MIN; 
     if ( LEDDRIVER15_OK == leddriver15_set_i2c_dimming ( &leddriver15, dimming ) ) 
     { 
         log_printf( &logger, " Dimming level: %urnn", ( uint16_t ) dimming ); 
     } 
     if ( ++dimming > LEDDRIVER15_I2C_DIMMING_MAX ) 
     { 
         dimming = LEDDRIVER15_I2C_DIMMING_MIN; 
     } 
     Delay_ms( 500 ); 
 }

The complete 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.LEDDriver15

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. A UART terminal is available in all Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK - Mikroe Software Development Kit, which needs to be downloaded from the LibStock and installed for the compiler you are using to ensure proper operation of mikroSDK compliant Click board™ demo applications.

For more information about mikroSDK, visit the official page.