MSB

LSB

Internal ALS Resistor Register

Register Address: 0x51

R3A

bit7

R2A

bit6

R1A

bit5

R0A

bit4

R3B

bit3

R2B

bit2

R1B

bit1

R0B

bit0

MSB

LSB

ALS Control / SI Rev Register

Register Address: 0x50

ALS-EN

bit7

AVE2

bit6

AVE1

bit5

AVE0

bit4

0

bit3

0

bit2

Rev1

bit1

Rev0

bit0

MSB

LSB

ALS Zone Register

Register Address: 0x40

1

bit7

1

bit6

1

bit5

1

bit4

FLAG

bit3

ZONE2

bit2

ZONE1

bit1

ZONE0

bit0

LM3535

www.ti.com

SNVS598A – AUGUST 2010 – REVISED MAY 2013

0011110

0.725%

0111101

3.684%

1011110

18.713%

1111110

95.048%

0011111

0.763%

0111111

3.876%

1011111

19.687%

1111111

100.000%

GroupB and GroupC Brightness Levels = 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 25mA

Figure 34. ALS Zone Register Description

Internal Hex Address: 0x40

•

ZONE0-ZONE2: ALS Zone information: '000’ = Zone0, ‘001’ = Zone1, ‘010’ = Zone2, ‘011’ = Zone3, ‘100’ =

Zone4. Other combinations not used

•

FLAG: ALS Transition Flag. '1' = Transition has occurred. '0' = No Transition. The FLAG bit is cleared once

the 0x40 register has been read.

Figure 35. ALS Control / Silicon Revision Register Description

Internal Hex Address: 0x50

•

Rev0-Rev1 : Stores the Silicon Revision value. LM3535 = '11', LM3535-2ALS = '00'

•

AVE2-AVE0: Sets Averaging Time for ALS sampling. Need two to three Averaging periods to make transition

decision.‘000’ = 25ms, ‘001’ = 50ms, ‘010’ = 100ms, ‘011’ = 200ms, ‘100’ = 400ms, ‘101’ = 800ms, ‘110’ =

1.6s, ‘111’ = 3.2s

Figure 36. ALS Resistor Control Register Description

Internal Hex Address: 0x51

•

R3A-R0A are valid on both the LM3535 and LM3535-2ALS.

•

R3B-R0B are only valid on LM3535-2ALS.

•

R0-R3: Sets the internal ALS resistor value

Table 2. Internal ALS Resistor Table

R3x

R2x

R1x

R0x

ALSA

ALSB

Resistor

Resistor

Value (

Ω)

Value (

Ω)

0

0

0

0

High Impedance

0

0

0

1

13.6k

13.65k

0

0

1

0

9.08k

9.13k

0

0

1

1

5.47k

5.52k

0

1

0

0

2.32k

2.37k

0

1

0

1

1.99k

2.05k

0

1

1

0

1.86k

1.92k

0

1

1

1

1.65k

1.70k

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