LM3533 datasheet(39/63 Pages) TI1

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Code(D)

RALS

10 µA

LM3533

www.ti.com

SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015

Table 21. R_ALS Select Register (Address 0x30)

Bit 7

Bits [6:0]

Not Used

ALS Resistor Select Code

0000000 = ALS input is high impedance (Default)

0000001 = 200k

Ω (10µA at 2V full-scale)

0000010 = 100k

Ω (20µA at 2V full-scale)

1111110 = 1.587k

Ω (1.26mA at 2V full-scale)

1111111 = 1.575k

Ω (1.27mA at 2V full-scale)

The selectable codes are available which give a linear step in currents of 10 µA per code based upon 2V/R_ALS.

This gives a code to resistance relationship of:

(8)

Table 22. ALS Configuration Register (Address 0x31)

Bit [7:6]

Bits [5:3]

Bit 2

Bit 1

Bit 0

Not Used

ALS Average Times

Fast startup

ALS Input Mode

ALS Enable/Disable

Enable/Disable

000 = 17.92 ms

0 = ALS fast startup is

0 = ALS is set for Analog

0 = ALS is disabled

001 = 35.84ms

enabled (Default)

Sensor Input Mode

(Default)

010 = 71.68ms

1 = ALS fast startup is

(Default)

1 = ALS is enabled

011 = 143.36ms

disabled

1 = ALS is set for PWM

100 = 286.72ms (Default)

Sensor Input Mode

101 = 573.44ms

110 = 1146.88ms

111 = 2293.76ms

Table 23. ALS Algorithm Select Register (Address 0x32)

Bits [7:6]

Bits [5:4]

Bits [3:2]

Bits [1:0]

ALS Pattern Generator Zone

ALSM3 zone Algorithm Select

ALSM2 zone Algorithm Select

ALSM1 zone Algorithm Select

Algorithm Select

00 = Direct Control (Default)

00 = Direct Control

00 = Direct Control (default)

(Default)(Default)

01 = Up Only Control

01 = Up Only

1× = Down Delay Control

1X = Down Delay

1× = Down Delay

Table 24. ALS Down Delay Control Register (Address 0x33)

Bits [7:4]

Bits [4:0]

Not Used

Down Delay Settings

(# Indicates total average periods required to force a change in the down direction)

00000 = 6 (Default)

11111 = 37

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