LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 33

• Manufacturer Part Number: LM3532TMX-40ANOPB
• Description: High Efficiency White Led Driver With Programmable Ambient Light Sensing Capability And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

ALS DOWN DELAY
The ALS Down Delay Register adds additional average time
delays for ALS changes in the backlight current during falling
ALS CONFIGURATION
The ALS Configuration register controls the ALS average
times, the ALS enable bit, and the ALS input select.
N/A
00 = Average of ALS1 and
ALS2 is used to determine
backlight current
01 = Only the ALS1 input is
used to determine backlight
current (default)
10 = Only the ALS2 input is
used to determine the
backlight current
11 = The maximum of ALS1
and ALS2 is used to
determine the backlight
current
ALS Input Select
Bits [7:6]
Not Used
Bits [7:6]
TABLE 17. ALS Configuration Register Description (Address 0x23)
TABLE 16. ALS Down Delay Register Description (Address 0x22)
00 = Direct ALS Control. ALS
inputs respond to up and down
transitions (default)
01 = This setting is for a future
mode.
1X = Down Delay Control. Extra
delays of 3 x t
added for down transitions, before
the new backlight target is
programmed. (see
DELAY
0 = ALS Fast startup is Disabled
1 = ALS Fast startup is Enabled (default)
section).
ALS Control
ALS Fast startup Enable
Bit [5:4]
AVE
to 34 x t
DOWN
Bit [5]
AVE
are
33
0 = ALS is disabled
(default)
1 = ALS is enabled
ALS input voltages. Code 00000 adds 3 extra average period
delays on top of the 3 default delays (6 total). Code 11111
adds 34 extra average period delays.
ALS Enable
Bit 3
00000 = 6 total Average Period delay for Down
Delay Control (default)
:
:
:
11111 = 34 total Average Periods of Delay for
Down Delay Control
000 = 17.92 ms
001 = 35.84 ms
010 = 71.68 ms
011 = 143.36 ms
100 = 286.72 ms (default)
101 = 573.44 ms
110 = 1146.88 ms
111 = 2293.76 ms
Down Delay
Bits [4:0]
ALS Average Time
Bits [2:0]
www.national.com