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TSL2571
LIGHT-TO-DIGITAL CONVERTER
TAOS117A − FEBRUARY 2011
Features
D
Ambient Light Sensing (ALS)
Approximates Human Eye Response
Programmable Analog Gain
Programmable Integration Time
Programmable Interrupt Function with
Upper and Lower Threshold
− Resolution Up to 16 Bits
− Very High Sensitivity — Operates Well
Behind Darkened Glass
− Up to 1,000,000:1 Dynamic Range
Programmable Wait Timer
− Programmable from 2.72 ms
to > 8 Seconds
− Wait State — 65
mA
Typical Current
I
2
C Interface Compatible
− Up to 400 kHz (I
2
C Fast Mode)
− Dedicated Interrupt Pin
Small 2 mm
y
2 mm ODFN Package
Sleep Mode — 2.5
mA
Typical Current
−
−
−
−
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
V
DD
1
SCL 2
GND 3
6 SDA
5 INT
4 NC
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Applications
D
D
D
D
D
D
Display Management
Backlight Control
Portable Device Power Optimization
Cell Phones, PDA, GPS
Notebooks and Monitors
LCD TVs
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D
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Description
The TSL2571 family of devices provides ambient light sensing (ALS) that approximates human eye response
to light intensity under a variety of lighting conditions and through a variety of attenuation materials. While useful
for general purpose light sensing, the device is particularly useful for display management with the purpose of
extending battery life and providing optimum viewing in diverse lighting conditions. Display panel and keyboard
backlighting can account for up to 30 to 40 percent of total platform power. The ALS features are ideal for use
in notebook PCs, LCD monitors, flat-panel televisions, and cell phones.
Functional Block Diagram
GND
Interrupt
Wait Control
Upper Limit
I
2
C Interface
V
DD
CH0
ADC
CH0
CH1
ADC
CH1
CH1
Data
CH0
Data
Lower Limit
SCL
INT
ALS Control
SDA
The
LUMENOLOGY
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Company
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
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Suite 300
S
Plano, TX 75074
S
(972) 673-0759
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www.taosinc.com
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Copyright
E
2011, TAOS Inc.
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
