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Bit 7

(Not Used)

Bit 6

ALS Input

Select 2

Bit 5

ALS Input

Select 1

Bit 4

ALS Mode

Bit 0

ALS

Averaging

Time

Bit 1

ALS

Averaging

Time

ALS Configuration Register

Address 0x20, Default Value 0x2C

MSB

LSB

Bit 3

ALS

Enable

Bit 2

ALS

Averaging

Time

Bit 7

Simple

Interface

Enable

Bit 6

PWM

Polarity

Bit 5

PWM

Enable

Bit 4

Full

Scale

Current

Select

Bit 0

I2C

Interface

Enable

Bit 1

Brightness

Mapping

Mode

Select

General Configuration Register

Address 0x10, Default Value 0xB0

MSB

LSB

Bit 3

Full

Scale

Current

Select

Bit 2

Full

Scale

Current

Select

LM3530

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SNVS606L – JUNE 2009 – REVISED DECEMBER 2014

*Note: Unused bits in the LM3530 Registers default to a logic '1'.

8.6.1.1 General Configuration Register (GP)

The General Configuration Register (address 0x10) is described in Figure 41 and Table 5.

Figure 41. General Configuration Register

Table 5. General Configuration Register Description (0x10)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(PWM Simple

(PWM Polarity)

(EN_PWM)

(Full-Scale

(Mapping Mode

(I2C Device

Enable

see Figure 31

Current

Select)

Enable)

Select)

0 = Simple

0 = PWM active

0 = LED current

000 = 5 mA full-scale current

0 = exponential

0 = Device

Interface at

high

is not a function

001 = 8.5 mA full-scale current

mapping

Disabled

PWM Input is

1 = PWM active

of PWM duty

010 = 12 mA full-scale current

1 = linear

1 = Device

Disabled

low

cycle

011 = 15.5 mA full-scale current

mapping

Enabled

1 = Simple

1 = LED current

100 = 19 mA full-scale current

Interface at

is a function of

101 = 22.5 mA full-scale current

PWM Input is

duty cycle

110 = 26 mA full-scale current

Enabled

111 = 29.5 mA full-scale current

8.6.1.2 ALS Configuration Register

The ALS Configuration Register controls the Ambient Light Sensing input functions and is described in Figure 42

and Table 6.

Figure 42. ALS Configuration Register

Table 6. ALS Configuration Register Description (0x20)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ALS Input

ALS Enable

ALS

Select

Averaging

Time

N/A

00 = The Average of ALS1 and

00 or 10 = ALS is disabled. The

000 = 32 ms

ALS2 is used to control the LED

Brightness Register is used to

001 = 64 ms

brightness

determine the LED current.

010 = 128 ms

01 = ALS1 is used to control the

01 = ALS is enabled. The

011 = 256 ms

LED brightness

Brightness Register is used to

100 = 512 ms

10 = ALS2 is used to control the

determine the LED Current.

101 = 1024 ms

LED brightness

11 = ALS inputs are enabled.

110 = 2048 ms

11 = The ALS input with the

Ambient light determines the LED 111 = 4096 ms

highest voltage is used to control

current.

the LED brightness

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