TSL2581 Datasheet, PDF (1/32 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – LIGHT-TO-DIGITAL CONVERTER

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Features
D 30y More Sensitive Than the TSL2560/61
Device
D Approximates Human Eye Response
D Programmable ALS Interrupt Function with
User-Defined Upper and Lower Threshold
Settings
D 16-Bit Digital Output with I²C Fast-Mode at
400 kHz
D Programmable Analog Gain and Integration
Time Supporting 1,000,000-to-1 Dynamic
Range
D Available in Ultra-Small 1.25 mm y 1.75 mm
Chipscale Package and Small 2 mm y 2 mm
Flat No-Lead Package
D Automatically Rejects 50/60-Hz Lighting
Ripple
D Low Quiescent Current 3 mA in Power
Down Mode
D RoHS Compliant
TSL2581, TSL2583
LIGHT-TO-DIGITAL CONVERTER
TAOS134 − MARCH 2011
PACKAGE CS
6-LEAD CHIPSCALE
(TOP VIEW)
V_DD 1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
V_DD 1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
Package Drawings are Not to Scale
Applications
D Ambient Light Sensor (ALS) for Display
Brightness Control
End Products and Market Segments
D HDTVs
D Laptops and Tablets
D Mobile Handsets
D Monitors
Description
The TSL2581 and TSL2583 are very-high sensitivity light-to-digital converters that transform light intensity to
a digital signal output capable of direct I²C interface. Each device combines one broadband photodiode (visible
plus infrared) and one infrared-responding photodiode on a single CMOS integrated circuit capable of providing
a near-photopic response over an effective 16-bit dynamic range (16-bit resolution). Two integrating ADCs
convert the photodiode currents to a digital output that represents the irradiance measured on each channel.
This digital output can be input to a microprocessor where illuminance (ambient light level) in lux is derived using
an empirical formula to approximate the human eye response. The TSL2581 device supports a traditional level
style interrupt that remains asserted until the firmware clears it.
While useful for general purpose light sensing applications, the TSL2581/83 devices are designed particularly
for displays (LCD, OLED, etc.) with the purpose of extending battery life and providing optimum viewing in
diverse lighting conditions. Display panel backlighting, which can account for up to 50 to 60 percent of total
platform power, can be automatically managed. Both devices are also ideal for controlling keyboard illumination
based upon ambient lighting conditions. Illuminance information can further be used to manage exposure
control in digital cameras. The TSL2581/83 devices are ideal in notebook/tablet PCs, LCD monitors, flat-panel
televisions, cell phones, and digital cameras. In addition, other applications include street light control, security
lighting, sunlight harvesting, machine vision, and automotive instrumentation clusters.
The LUMENOLOGY r Company
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Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972_r) 673-0759
www.taosinc.com
Copyright E 2011, TAOS Inc.
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