TSL2580 CONVERTER Datasheet

TSL2580 Datasheet, PDF, Equivalent


Part Number

TSL2580

Description

LIGHT-TO-DIGITAL CONVERTER

Manufacture

TAOS

Total Page 30 Pages
Datasheet
Download TSL2580 Datasheet


TSL2580
r
r
Features
D Approximately 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 SMBus (TSL2580)
at 100 kHz or I2C (TSL2581) 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
D Automatically Rejects 50/60-Hz Lighting
Ripple
D Low Quiescent Current 3 mA in Power
Down Mode
D RoHS Compliant
TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
PACKAGE CS
6-LEAD CHIPSCALE
(TOP VIEW)
Vdd 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)
Vdd 1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
Applications
D Ambient Light Sensor (ALS) for Smart
Phones, Digital Photo Frames, and Portable
Navigation Systems
D ALS for LED Signs, Laptop Computers, and
LCD TVs
Description
The TSL2580 and TSL2581 are very-high sensitivity light-to-digital converters that transform light intensity to
a digital signal output capable of direct I2C (TSL2581) or SMBus (TSL2580) 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
TSL2580 device permits an SMB-Alert style interrupt, and 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 TSL2580/81 devices are designed particularly
for display panels (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 30 to 40 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 TSL2580/81 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 2010, TAOS Inc.
1

TSL2580
TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Functional Block Diagram
VDD = 2.7 V to 3.6 V
Channel 0
Visible and IR
Channel 1
IR Only
Integrating
A/D Converter
ADDR SEL
Address Select
Command
Register
ADC
Register
Two-Wire Serial Interface
Interrupt
INT
SCL
SDA
Detailed Description
The TSL2580 and TSL2581 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 SMBus or 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. Since 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 2010, TAOS Inc.
2
r
www.taosinc.com
The LUMENOLOGY r Company
r


Features Technical coantmesntAsGtill valid r r F eatures D Approximately 30y More Sensit ive Than the TSL2560/61 Device D Approx imates Human Eye Response D Programmabl e ALS Interrupt Function with User-Defi ned Upper and Lower Threshold Settings D 16-Bit Digital Output with SMBus (TSL 2580) at 100 kHz or I2C (TSL2581) Fast- Mode at 400 kHz D Programmable Analog G ain and Integration Time Supporting 1,0 00,000-to-1 Dynamic Range D Available i n Ultra-Small 1.25 mm y 1.75 mm Chipsca le Package D Automatically Rejects 50/6 0-Hz Lighting Ripple D Low Quiescent Cu rrent 3 mA in Power Down Mode D RoHS Co mpliant TSL2580, TSL2581 LIGHT-TO-DIGI TAL CONVERTER TAOS098 − MARCH 2010 PA CKAGE CS 6-LEAD CHIPSCALE (TOP VIEW) V dd 1 ADDR SEL 2 GND 3 6 SDA 5 INT 4 SC L Package Drawings are Not to Scale PA CKAGE FN DUAL FLAT NO-LEAD (TOP VIEW) Vdd 1 ADDR SEL 2 GND 3 6 SDA 5 INT 4 S CL Applications D Ambient Light Sensor (ALS) for Smart Phones, Digital Photo Frames, and Portable Navigation Systems D ALS for LED Signs, Lapt.
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