LP3954TLXSLASHNOPB datasheet(28/60 Pages) TI1

номер детали	LP3954TLX/NOPB

подробное описание детали	Advanced Lighting Management Unit

PDF	60 Pages

Scroll/Zoom	100%

производитель	TI1 [Texas Instruments]

домашняя страница	http://www.ti.com

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0.05

0.10

0.15

0.20

0.25

0.30

WLED OUTPUT VOLTAGE (V)

-40

LP3954

SNVS340D – JUNE 2005 – REVISED MARCH 2013

www.ti.com

ADJUSTMENT

WLED1-4[7:0]

Driver Current,

WLED5-6[7:0]

mA (typical)

0000 0000

0000 0001

0.1

0000 0010

0.2

0000 0011

0.3

…

1111 1101

25.3

1111 1110

25.4

1111 1111

25.5

Figure 28. WLED Output Current vs. Voltage

FADE IN / FADE OUT

LP3954 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.

Automatic fade disabled

EN_FADE

Automatic fade enabled

Fade execution time 1.3s

SLOPE

Fade execution time 0.65s

Fade controls WLED1-4

FADE_SEL

Fade controls WLED5-6

Recommended fading sequence:

1. ASSUMPTION: Current WLED value in register

2. Set SLOPE

3. Set FADE_SEL

4. Set EN_FADE = 1

5. Set target WLED value

6. Fading will be done either within 0.5s or 1s based on Slope selection

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