Zone0

Zone1

Zone2

Zone3

Zone4

Zone0

Zone1

Zone2

Zone3

Zone4

1 Ave

Period

Zone0

Zone1

Zone2

Zone3

Zone4

Averager Output

LED Brightness

Zone

ALS Input

Zone0

Zone1

Zone2

Zone3

Zone4

µ5¶ = Rest, µ+¶ = Increase, µ-µ = Decrease

0

1

1

3

4

4

0

4

+

R

+

+

+

R

R

R

Averager Output

Brightness

Zone

Zone0

Zone1

Zone2

Zone3

Zone4

4

3

3

1

0

0

4

0

-

R

-

-

-

R

R

R

Brightness

Zone

Zone0

Zone1

Zone2

Zone3

Zone4

0

4

4

4

4

1

0

1

+

+

-

+

-

-

R

R

Brightness

Zone

23

LM3535

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SNVS598B – AUGUST 2010 – REVISED MARCH 2018

Product Folder Links: LM3535

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Figure 33. Brightness Zone Change Examples

Using the diagram for the ALS block (Figure 30), Figure 34 shows the flow of information starting with the A/D,

transitioning to the averager, followed by the discriminator. Each state filters the previous output to help prevent

unwanted zone to zone transitions.

Figure 34. Ambient Light Input To Backlight Mapping