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BD6083GUL
Datasheet
● ALC (Auto Luminous Control)
LCD backlight current adjustment is possible in the basis of the data detected by external ambient light sensor.
? Extensive selection of the ambient light sensors (Photo Diode, Photo Transistor, Photo IC(linear / logarithm)) is possible by
building adjustment feature of Sensor bias, gain adjustment and offset adjustment.
? Ambient data is changed into ambient level by digital data processing, and it can be read through I 2 C I / F.
? Register setting can customize a conversion to LED current. (Initial Value is pre-set.)
? Natural dimming of LED driver is possible with the adjustment of the current transition speed.
Always ON / Intermittence
PWM enabling
WPWMIN
SBIAS
SBIAS
Conversion
Slope Timer
Mode Select
LED*
LCD
Sensor
SSENS
ADC
Average
Logarithmic Conv.
Ambient Level
Current
Conversion
Slope
process
Backlight
DC current setup
Main Group
setup
GC1
GC2
Gain
Control
Gain Control ON/OFF
Ambient Level
： Effective also in ALC functional the case of not using it
Figure 13.
(1)Auto Luminous Control ON/OFF
? ALC block can be independent setting ON/OFF.
? It can use only to measure the Ambient level.
Register: ALCEN
Register: MLEDEN
Register: MLEDMD
? Refer to under about the associate ALC mode and Main LED current.
ALCEN
0
0
0
1
1
1
MLEDEN
0
1
1
0
1
1
MLEDMD
x
0
1
x
0
1
Sensor I/F
OFF
( AMB(3:0)=0h )
ON
LED control
OFF
ON
OFF
ON
Mode
OFF
Non ALC mode
ALC mode
Main LED current
-
IMLED(6:0)
IU0(6:0) ( * 1)
-
IMLED(6:0)
ALC mode ( * 2)
( * 1)
( * 2)
At this mode, because Sensor I/F is OFF, AMB(3:0)=0h.
So, Main LED current is selected IU0(6:0).
At this mode, Main LED current is calculated (See(8)Convert LED Current)
It becomes current value corresponding to each brightness.
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? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
28/42
TSZ02201-0G3G0C200100-1-2
05.Oct.2012 Rev.001
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