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LP5569: Current consumption related settings and queries

Part Number: LP5569

Hi,

I am using LP5569 in my battery-operated application.

I am using LP5569 for controlling 9 LEDs, just turn ON/OFF, No special effects.

Below is my register configurations.

reg[0] = LP5569_CONFIG; // config register
reg[1] = 0x00; // data
err_code = i2c_lp5569_write_data(reg, 2);

/* Delay requiered */

nrf_delay_ms(100);

reg[0] = LP5569_CONFIG; // config register
reg[1] = 0x40; // chip enabled
err_code = i2c_lp5569_write_data(reg, 0x02); 

reg[0] = LP5569_MISC; //MISC Register
reg[1] = 0x48; // chip enabled
err_code = i2c_lp5569_write_data(reg, 0x02);

reg[0] = LP5569_LED0_CONTROL; //LED Control Register
memset(&reg[1],0x08,0x09);

err_code = i2c_lp5569_write_data(reg, 0x0A);

reg[0] = LP5569_LED0_CURRENT; //LED Current Register
memset(&reg[1],0xFF/*(0x50 * 2)*/,0x09);
err_code = i2c_lp5569_write_data(reg, 0x0A);

for a turn, ON/OFF I am writing 0xFF on specific PWM register i.e LED0_PWM(led 0)

Below are my queries

1) when I am measuring current consumption I am getting the same current consumption for all LEDs like if I am using the only ane LED then also it consumes the same current as when I am using all LEDs.

-> As per my understanding current consumption should be less when I am turning ON only one LED.

2) can you please suggest some register settings for power-efficient, LED turn ON/OFF operation.

Please let me know if you need more information.

Thanks 

  • Hi, Rakesh,

    1.what does the current consumption mean? If meaning the LED current, it is determined by the LED current register. The current consumption of VCC varies by the numbers, current and pwm duty of OUTPUT pin.

    2.When the LED outputs are not active, the LP5569 device is able to enter the power-save mode automatically, thus lowering idle-current consumption down to 10 μA (typical). Automatic power-save mode is enabled when the MISC register (address 2Fh) POWERSAVE_EN bit = 1. 

    Best Regards

    Monet Xu