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TSL2581FN

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TSL2581, TSL2583
LIGHT-TO-DIGITAL CONVERTER
TAOS134 − MARCH 2011
1
The LUMENOLOGY r Company
r
r
Copyright E 2011, TAOS Inc.
www.taosinc.com
Features
D 30 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 I
2
C 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 1.75 mm
Chipscale Package and Small 2 mm 2 mm
Flat No-Lead Package
D Automatically Rejects 50/60-Hz Lighting
Ripple
D Low Quiescent Current 3 A in Power
Down Mode
D RoHS Compliant
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 I
2
C 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.
r
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759
PACKAGE CS
6-LEAD CHIPSCALE
(TOP VIEW)
V
DD
1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
Package Drawings are Not to Scale
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
6 SDA
5 INT
4 SCL
V
DD
1
ADDR SEL 2
GND 3
TSL2581, TSL2583
LIGHT-TO-DIGITAL CONVERTER
TAOS134 − MARCH 2011
2
r
r
Copyright E 2011, TAOS Inc.
The LUMENOLOGY r Company
www.taosinc.com
Functional Block Diagram
Two-Wire Serial Interface
Address Select Interrupt
SDA
V
DD
Channel 0
Visible and IR
Channel 1
IR Only
Command
Register
ADC
Register
INT
SCL
ADDR SEL
Integrating
A/D Converter
Detailed Description
The TSL2581 and TSL2583 are second-generation ambient light sensor devices. Each contains two integrating
analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels
occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the
Channel 0 and Channel 1 data registers, respectively. The transfers are double-buffered to ensure that the
integrity of the data is maintained. After the transfer, the device automatically begins the next integration cycle.
Communication to the device is accomplished through a standard, two-wire I
2
C serial bus. Consequently, the
TSL258x device can be easily connected to a microcontroller or embedded controller. No external circuitry is
required for signal conditioning, thereby saving PCB real estate as well. Because the output of the TSL258x
device is digital, the output is effectively immune to noise when compared to an analog signal.
The TSL258x devices also support an interrupt feature that simplifies and improves system efficiency by
eliminating the need to poll a sensor for a light intensity value. The primary purpose of the interrupt function is
to detect a meaningful change in light intensity. The concept of a meaningful change can be defined by the user
both in terms of light intensity and time, or persistence, of that change in intensity. The TSL258x devices have
the ability to define a threshold above and below the current light level. An interrupt is generated when the value
of a conversion exceeds either of these limits.
TSL2581, TSL2583
LIGHT-TO-DIGITAL CONVERTER
TAOS134 − MARCH 2011
3
The LUMENOLOGY r Company
r
r
Copyright E 2011, TAOS Inc.
www.taosinc.com
Terminal Functions
TERMINAL
TYPE
DESCRIPTION
NAME
NO.
TYPE DESCRIPTION
ADDR SEL 2 I Address select — three-state.
GND 3 Power supply ground. All voltages are referenced to GND.
INT 5 O Interrupt — open drain.
SCL 4 I Serial clock input terminal — clock signal.
SDA 6 I/O Serial data I/O terminal — serial data I/O.
V
DD
1 Supply voltage.
Available Options
DEVICE PACKAGE − LEADS INTERFACE TYPE ORDERING NUMBER
TSL2581 CS−6 I
2
C Bus = V
DD
TSL2581CS
TSL2581 FN−6 I
2
C Bus = V
DD
TSL2581FN
TSL2583
†
CS−6 I
2
C Bus = 1.8 V TSL2583CS
TSL2583 FN−6 I
2
C Bus = 1.8 V TSL2583FN
†
Contact TAOS for availability.
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(see Note 1) 3.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital output voltage range, V
O
−0.5 V to 3.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital output current, I
O
−1 mA to 20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ESD tolerance, human body model 2000 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltages are with respect to GND.
Recommended Operating Conditions
MIN NOM MAX UNIT
Supply voltage, V
DD
2.7 3 3.6 V
Operating free-air temperature, T
A
−30 70 °C
SCL SDA input low voltage V
TSL2581 (Note 2) 0.3 V
DD
V
SCL, SDA input low voltage, V
IL
TSL2583 (Note 3) 0.54
V
SCL SDA input high voltage V
TSL2581 (Note 2) 0.7 V
DD
V
SCL, SDA input high voltage, V
IH
TSL2583 (Note 3) 1.25
V
NOTES: 2. Meets I
2
C specifications where V
BUS
=
V
DD
.
3. Meets I
2
C specifications where V
BUS
= 1.8 V.
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TSL2581FN

Mfr. #:
Buy TSL2581FN
Manufacturer:
ams
Description:
Light to Digital Converters Light to Digital 30x Sensitivity
Lifecycle:
New from this manufacturer.
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