LM3532 datasheet(16/52 Pages) TI2

Part #	LM3532

Description	LM3532 High-Efficiency White LED Driver With Programmable Ambient Light Sensing Capability and I2C-Compatible Interface

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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Ambient Light (lux)

VALS_REF = 2V

Zone

Boundary 3_

Zone

Boundary 0_

Zone

Boundary 1_

Zone

Boundary 2_

Zone 0

Zone 4

Zone 3

Zone 2

Zone 1

LED Driver Input Code (0x00 - 0xFF)

Full

Scale

Zone

Target 4

Zone

Target 3

Zone

Target 2

Zone

Target 1

Zone

Target 0

LM3532

SNVS653E – JULY 2011 – REVISED AUGUST 2015

www.ti.com

Figure 14. Ambient Light Input to Backlight Mapping

7.4.10.3 Ambient Light Zone Hysteresis

For each Zone Boundary there are two Zone Boundary Registers: a Zone Boundary High Register and a Zone

Boundary Low Register. The difference between the Zone Boundary High and Zone Boundary Low Register set

points (for a specific zone) creates the hysteresis that is required to transition between two adjacent zones. This

hysteresis prevents the backlight current from oscillating between zones when the ALS voltage is close to a Zone

Boundary Threshold. Figure 15 describes this Zone Boundary Hysteresis. The arrows indicate the direction of the

ALS input voltage. The black dots indicate the threshold used when transitioning to a new zone.

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