LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 35

• 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 ZONE BOUNDARIES
There are 4 ALS Zone Boundary registers which form the
boundaries for the 5 Ambient Light Zones. Each Zone Bound-
ary register is 8 bits with a maximum voltage of 2V. This gives
a step size for each Zone Boundary Register bit of:
(See ALS Zone Boundaries + Hysteresis
ZONE TARGET REGISTERS
There are 3 groups of Zone Target Registers (Control A, Con-
trol B, and Control C). The Zone Target registers have 2
functions. In Ambient Light Current control, they map directly
(See Ambient Light Input to Backlight Mapping,
In I
the particular Control Bank can be the LED brightness regis-
2
C Current Control, any of the 5 Zone Target Registers for
ALS Zone Boundary 3 High (Address 0x66), default = 0xDC (1725.5 mV)
Control C Zone Target Register 0 maps directly to Zone 0 (Address 0x7A)
Control C Zone Target Register 1 maps directly to Zone 1 (Address 0x7B)
Control C Zone Target Register 2 maps directly to Zone 2 (Address 0x7C)
Control C Zone Target Register 3 maps directly to Zone 3 (Address 0x7D)
Control C Zone Target Register 4 maps directly to Zone 4 (Address 0x7E)
Control A Zone Target Register 0 maps directly to Zone 0 (Address 0x70)
Control A Zone Target Register 1 maps directly to Zone 1 (Address 0x71)
Control A Zone Target Register 2 maps directly to Zone 2 (Address 0x72)
Control A Zone Target Register 3 maps directly to Zone 3 (Address 0x73)
Control A Zone Target Register 4 maps directly to Zone 4 (Address 0x74)
Control B Zone Target Register 0 maps directly to Zone 0 (Address 0x75)
Control B Zone Target Register 1 maps directly to Zone 1 (Address 0x76)
Control B Zone Target Register 2 maps directly to Zone 2 (Address 0x77)
Control B Zone Target Register 3 maps directly to Zone 3 (Address 0x78)
Control B Zone Target Register 4 maps directly to Zone 4 (Address 0x79)
ALS Zone Boundary 2 High (Address 0x64), default = 0xA1 (1262.7 mV)
ALS Zone Boundary 1 High (Address 0x62), default = 0x6A (831.4 mV)
ALS Zone Boundary 0 High (Address 0x60), default = 0x35 (415.7 mV)
ALS Zone Boundary 3 Low (Address 0x67), default = 0xCC (1600 mV)
ALS Zone Boundary 2 Low (Address 0x65), default = 0x99 (1200 mV)
ALS Zone Boundary 0 Low (Address 0x61), default = 0x33 (400 mV)
ALS Zone Boundary 1 Low (Address 0x63), default = 0x66 (800 mV)
Figure
Figure
6)
5)
35
to the corresponding ALS Zone. When the active ALS input
lands within the programmed Zone, the backlight current is
programmed to the corresponding zone target registers set
point (see below).
ters. This is set according to Control A, B, or C Brightness
Configuration Registers (Bits [4:2]).
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