Data Sheet

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Optical Sensor
LTR-559ALS-01
PS_LED Register (0x82)
The PS_LED register controls the LED pulse modulation frequency, LED current duty cycle and LED peak current.
Field
Bits
Default
Type
Description
LED Pulse
Modulation
Frequency
7:5
011
RW
000
LED pulse period = 30kHz
001
LED pulse period = 40kHz
010
LED pulse period = 50kHz
011
LED pulse period = 60kHz (default)
100
LED pulse period = 70kHz
101
LED pulse period = 80kHz
110
LED pulse period = 90kHz
111
LED pulse period = 100kHz
LED Duty
Cycle
4:3
11
RW
00
DUTY = 25%
01
DUTY = 50%
10
DUTY = 75%
11
DUTY = 100% (default)
LED Current
2:0
111
RW
000
LED pulsed current level = 5mA
001
LED pulsed current level = 10mA
010
LED pulsed current level = 20mA
011
LED pulsed current level = 50mA
100
LED pulsed current level = 100mA (default)
101
110
111
0x82
PS_LED (default = 0x7F)
B7
B6
B5
B4
B3
B2
B1
B0
LED Pulse Frequency
LED Duty Cycle
LED Peak Current