LIGHT-TO-DIGITAL CONVERTER. TSL2583 Datasheet

TSL2583 Datasheet PDF


Part Number

TSL2583

Description

LIGHT-TO-DIGITAL CONVERTER

Manufacture

TAOS

Total Page 30 Pages
Datasheet
Download TSL2583 Datasheet


TSL2583
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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
TAOS134A − JULY 2012
PACKAGE CS
6-LEAD CHIPSCALE
(TOP VIEW)
VDD 1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
VDD 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
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2012, TAOS Inc.
1

TSL2583
TSL2581, TSL2583
LIGHT-TO-DIGITAL CONVERTER
TAOS134A − JULY 2012
Functional Block Diagram
Channel 0
Visible and IR
Integrating
A/D Converter
Channel 1
VDD IR Only
ADDR SEL
Address Select
Command
Register
ADC
Register
Two-Wire Serial Interface
Interrupt
INT
SCL
SDA
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 I2C 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.
Copyright E 2012, TAOS Inc.
2
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www.taosinc.com
The LUMENOLOGY r Company
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