LED Flash 2 click

Flash inhibition pin, or the FI pin - routed to the mikroBUS™ AN pin, with the corresponding bit in the Torch control register (02h), is used to limit the Flash mode current value to the Torch mode current value. This will effectively override the Flash mode.

For the Torch mode operation, the current is set to a lower value than for the Flash mode - with the 10K resistor connected to the TRSET, this current is set to 187.5mA. Similar as for the Flash mode, the torch control register (02h) controls the percentage of the current, set by the TRSET resistor.

Rising edge on the TEN or FEN - routed to the mikroBUS™ INT and PWM pins, will activate the Torch mode or the Flash mode, respectively. These modes can also be activated by setting the corresponding bits in the control registers.

EN pin - routed to the mikroBUS™ RST pin, along with the corresponding bit in the status register (00h), is used to enable the MIC2870 IC. Setting this pin to a HIGH logic level will put the IC into the standby state. Driving this pin low for more than 1 second - or setting the bit to a low state will put the MIC2870 IC into a shutdown mode, the lowest power consumption mode for this click board™.

All the control pins are internally pulled to a LOW logic state, so there is no need to use any pull-down resistors for this purpose, which further simplifies application designs with this click board™. 

Specifications

Pinout diagram

This table shows how the pinout on LED Flash 2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Flash inhibit	FI	1	AN	PWM	16	FEN	Flash enable
Chip enable	EN	2	RST	INT	15	TEN	Torch enable
		3	CS	RX	14	NC
		4	SCK	TX	13	NC
		5	MISO	SCL	12	SCL	I2C clock
		6	MOSI	SDA	11	SDA	I2C data
Power supply	+3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

LED Flash 2 click electrical specifications

Onboard settings and indicators

Software support

We provide a library for the LED Flash 2 click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

Library for LED Flash 2 click contains generic read / write functions. The library also contains control function (setMode), that can set click into any of the possible modes of operation, as well as a function that can toggle Flash inhibit pin on/off. 

Besides the mode parameter used to set the working mode of the click, the LED current is also forwarded to the functions as the parameter by means of constants, that are named according to the percentage of the current they are used to set - e.g. _LEDFLASH2_CUR_100 will not scale down the current and it will be 100% of what is set by the current limiting resistors on the click board. When using the FLASH mode (_LEDFLASH2_MODE_FLASH), another function parameter (_LEDFLASH2_FTMR_312) is used and it represents the safety timer, after which the LEDs will get turned off, to prevent damage. Otherwise it can be set to 0.

Key functions

uint8_t ledflash2_readRegister(uint8_t regAddress) - Generic read register function

void ledflash2_writeRegister(uint8_t regAddress, uint8_t regData) - Generic write register function

ledflash2_setMode(_LEDFLASH2_MODE_FLASH, _LEDFLASH2_CUR_100, _LEDFLASH2_FTMR_312);- Sets the operation mode

void ledflash2_toggleFlashInhibit(uint8_t pinState) - Toggles the Flash inhibit pin on/off

Examples description

The application is composed of three sections:

• System Initialization - Initializes pins, I2C peripheral, and logger.

• Application Initialization - Initializes driver, and sets the click into "OFF"

• Application Task - (Code snippet) This function will demonstrate how to use the flash mode, and the torch mode, with different power settings. It will then turn the click off

IMPORTANT NOTE: LED lights can be very bright, even with the lowest power settings. Avoid looking directly into the light, when working with the click.

    Delay_ms(1000);
    mikrobus_logWrite("Do not look directly into the led lights.", _LOG_LINE);
    mikrobus_logWrite("Triggering flash in 5...", _LOG_LINE);
    Delay_ms(1000);
    mikrobus_logWrite("4...", _LOG_LINE);
    Delay_ms(1000);
    mikrobus_logWrite("3...", _LOG_LINE);
    Delay_ms(1000);
    mikrobus_logWrite("2...", _LOG_LINE);
    Delay_ms(1000);
    mikrobus_logWrite("1...", _LOG_LINE);
    Delay_ms(1000);
    mikrobus_logWrite("Cheese!", _LOG_LINE);
    
    ledflash2_setMode(_LEDFLASH2_MODE_FLASH, _LEDFLASH2_CUR_100, _LEDFLASH2_FTMR_312);
    
    Delay_ms(350);
    ledflash2_setMode(_LEDFLASH2_MODE_OFF, 0, 0);
    Delay_ms(2000);
    mikrobus_logWrite("Switching to the torch mode in a moment...", _LOG_LINE);
    Delay_ms(2000);
    ledflash2_setMode(_LEDFLASH2_MODE_TORCH, _LEDFLASH2_CUR_100, 0);
    Delay_ms(5000);
    mikrobus_logWrite("Dimming the torch light...", _LOG_LINE);
    ledflash2_setMode(_LEDFLASH2_MODE_TORCH, _LEDFLASH2_CUR_18, 0);
    Delay_ms(5000);
    mikrobus_logWrite("Switching off...", _LOG_LINE);
    ledflash2_setMode(_LEDFLASH2_MODE_OFF, 0, 0);

• UART 

Downloads

 LibStock: LED Flash 2 click library 

 MIC2870 datasheet

 LED Flash 2 click schematic