main[7:0]

en_main

8-Bit IDAC

en_main_pwm

External PWM

&

MAIN

main[7:0]

en_main

8-Bit IDAC

en_main_pwm

External PWM

&

MAIN

sub[7:0]

en_sub

8-Bit IDAC

en_sub_pwm

External PWM

&

SUB

LP5526

SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

www.ti.com

Figure 23. MAIN output for 4 LEDs (DISPL = 0)

Figure 24. SUB output for 2 LEDs (DISPL = 0)

Figure 25. MAIN and SUB outputs for 8 LEDs (DISPL = 1)

EXTERNAL PWM CONTROL

The GPIO[0]/PWM pin can be used to control the backlight drivers brightness or set LEDs on/off. External PWM

control is enabled by writing 1 to EN_MAIN_PWM and/or EN_SUB_PWM bits in register address 2BH.

GPIO[0]/PWM pin is used as external PWM input when EN_PWM_PIN is set high. PWM input is active high, i.e.

LED is activated when in high state.

FADE IN / FADE OUT

LP5526 has an automatic fade in and out for main and sub backlight. The fade function is enabled with

EN_FADE bit. The slope of the fade curve is set by the SLOPE bit. Fade control for main and sub display is set

by FADE_SEL bit.

Recommended fading sequence:

1. Set SLOPE

2. Set FADE_SEL

3. Set EN_FADE = 1

4. Set EN_MAIN / EN_SUB = 1

22

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