LM3532 datasheet(32/52 Pages) TI2

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LM3532

SNVS653E – JULY 2011 – REVISED AUGUST 2015

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7.6.15 ALS Configuration

The ALS Configuration register controls the ALS average times, the ALS enable bit, and the ALS input select.

Table 17. ALSConfiguration Register Description (Address 0x23)

Bits [7:6]

Bit [5:4]

Bit 3

Bits [2:0]

ALS Input Select

ALS Control

ALS Enable

ALS Average Time

00 = Average of ALS1 and

00 = Direct ALS Control. ALS inputs

0 = ALS is disabled (default)

000 = 17.92 ms

ALS2 is used to determine

respond to up and down transitions

1 = ALS is enabled

001 = 35.84 ms

backlight current

(default)

010 = 71.68 ms

01 = Only the ALS1 input is

01 = This setting is for a future

011 = 143.36 ms

used to determine backlight

mode.

100 = 286.72 ms (default)

current (default)

1X = Down Delay Control. Extra

101 = 573.44 ms

10 = Only the ALS2 input is

delays of 3 x tAVE to 34 x tAVE are

110 = 1146.88 ms

used to determine the

added for down transitions, before

111 = 2293.76 ms

backlight current

the new backlight target is

11 = The maximum of ALS1

programmed. (see Down Delay

and ALS2 is used to

section).

determine the backlight

current

7.6.16 ALS Zone Readback / Information

The ALS Zone Readback and ALS Zone Information Readback registers each contain information on the current

ambient light brightness zone. The ALS Zone Readback register contains the ALS Zone after the averager and

discriminator block and reflects both up and down changes in the ambient light brightness zone. The ALS Zone

Information register reflects the contents of either the ALS Zone Readback register (with up and down transition).

This register also includes a Zone Change bit (bit 3) which is written with a 1 each time the ALS zone changes.

This bit is cleared upon read back of the ALS Zone Information register.

Table 18. ALS Zone Information Register Description (Address 0x24)

Bits [7:4]

Bit 3

Bits [2:0]

Not Used

Zone Change Bit

Brightness Zone

N/A

0 = No change in ALS Zone (default)

000 = Zone 0 (default)

1 = There was a change in the ALS Zone

001 = Zone 1

since the last read of this register. This bit is

010 = Zone 2

cleared on read back.

011 = Zone 3

1XX = Zone 4

Table 19. ALS Zone Readback Register Description (Address 0x25)

Bits [7:3]

Bits [2:0]

Not Used

Brightness Zone

N/A

000 = Zone 0 (default)

001 = Zone 1

010 = Zone 2

011 = Zone 3

1XX = Zone 4

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