LM3532 datasheet(17/52 Pages) TI2

Part #	LM3532

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

PDF	52 Pages

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Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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Zone 2

Zone Boundary 3 High

Zone Boundary 3 Low

Zone Boundary 2 High

Zone Boundary 2 Low

Zone Boundary 1 High

Zone Boundary 1 Low

Zone Boundary 0 High

Zone Boundary 0 Low

Zone 3

Zone 2

Zone 1

Zone 2

Zone 1

Zone 2

Zone 3

Zone 0

Zone 1

Zone 3

Zone 4

LM3532

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SNVS653E – JULY 2011 – REVISED AUGUST 2015

Figure 15. ALS Zone Boundaries + Hysteresis

7.4.10.4 PWM Enabled for a Particular Zone

The active PWM input for a specified control bank can be enabled/disabled for each ALS Brightness Zone. This

is done via bits[6:2] of the corresponding Control A, B, or C PWM Registers (see Table 6, Table 7, and Table 8).

For example, assuming Control Bank A is being used, then to make the PWM input active in Zones 0, 2, and 4,

but not active in Zones 1, and 3; bits[6:2] of the Control A PWM Register would be set to (1, 0, 1, 0, 1).

7.4.10.5 ALS Operation

Figure 16 shows a functional block diagram of the LM3532's ambient light sensor interface.

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LM3532 Datasheet(PDF) 17 Page - Texas Instruments