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LM3532

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SNVS653E – JULY 2011 – REVISED AUGUST 2015

7.6.17 ALS Zone Boundaries

There are 4 ALS Zone Boundary registers which form the boundaries for the 5 Ambient Light Zones. Each Zone

Boundary register is 8 bits with a maximum voltage of 2V. This gives a step size for each Zone Boundary

(4)

ALS Zone Boundary 0 High (Address 0x60), default = 0x35 (415.7 mV)

ALS Zone Boundary 0 Low (Address 0x61), default = 0x33 (400 mV)

Line-Break

ALS Zone Boundary 1 High (Address 0x62), default = 0x6A (831.4 mV)

ALS Zone Boundary 1 Low (Address 0x63), default = 0x66 (800 mV)

Line-Break

ALS Zone Boundary 2 High (Address 0x64), default = 0xA1 (1262.7 mV)

ALS Zone Boundary 2 Low (Address 0x65), default = 0x99 (1200 mV)

Line-Break

ALS Zone Boundary 3 High (Address 0x66), default = 0xDC (1725.5 mV)

ALS Zone Boundary 3 Low (Address 0x67), default = 0xCC (1600 mV)

7.6.18 Zone Target Registers

There are 3 groups of Zone Target Registers (Control A, Control B, and Control C). The Zone Target registers

have 2 functions. In Ambient Light Current control, they map directly 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).

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)

Line-Break

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)

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)

In I2C Current Control, any of the 5 Zone Target Registers for the particular Control Bank can be the LED

brightness registers. This is set according to Control A, B, or C Brightness Configuration Registers (Bits [4:2]).

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