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AS3676 Datasheet(PDF) 56 Page - ams AG

Part # AS3676
Description  Flexible Lighting Management
PDF  92 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3676 Datasheet(HTML) 56 Page - ams AG

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AS3676
Datasheet - D e ta i l e d D e s c r i p t i o n
8.4.9
DLS - Dynamic Luminance Scaling Input
The pin GPIO1/DLS can be used for dynamic backlight scaling input. Dynamic backlight scaling is used to reduce the
power of the backlight especially when showing dark picture contents on the display. The control unit to operate DLS
is the display processor sending a PWM signal to the AS3676 and in parallel changing the display content to compen-
sate for a reduced brightness backlight.
Note: If the input signal from the PWM (e.g. for DLS) is '0', the voltage on the current sink is captured with a S/H.
Do not enable DLS operation using the DCDC step up converter if the input GPIO1/DLS is continuously at 0.
When this feature is enabled, the current sink current is disabled when the pin GPIO1/DLS is at 0. If GPIO1/DLS=1,
the current sink operates at its programmed current as shown in Figure 24:
Table 87. ALS group 3 X1 Register
Addr: A6h
ALS group 3 X1
Bit
Bit Name
Default Access
Description
7:0
group3_x1
00h
R/W
Group 3 x1 value
Table 88. ALS group 3 K1 Register
Addr: A7h
ALS group 3 K1
Bit
Bit Name
Default Access
Description
7:0
group3_k1
00h
R/W
Group 3 k1 value - divided by 32 defines first slope
Table 89. ALS group 3 X2 Register
Addr: A8h
ALS group 3 X2
Bit
Bit Name
Default Access
Description
7:0
group3_x2
00h
R/W
Group 3 x2 value
Table 90. ALS group 3 K2 Register
Addr: A9h
ALS group 3 K2
Bit
Bit Name
Default Access
Description
7:0
group3_k2
00h
R/W
Group 3 k2 value- value divided by 32 defines second slope
Table 91. DLS Input Parameters
Symbol
Parameter
Condition
Min
Typ
Max
Unit
fDLS
DLS input frequency
range
pin GPIO1/DLS if used for DLS (any bit set
in register DLS mode control1 or DLS mode
control2)
25
1000
kHz



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