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TCS34725 Datasheet Preview

TCS34725 Datasheet

COLOR LIGHT-TO-DIGITAL CONVERTER

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r
r
Features
D Red, Green, Blue (RGB), and Clear Light
Sensing with IR Blocking Filter
− Programmable Analog Gain and
Integration Time
− 3,800,000:1 Dynamic Range
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
D Maskable Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D Power Management
− Low Power — 2.5-mA Sleep State
− 65-mA Wait State with Programmable Wait
State Time from 2.4 ms to > 7 Seconds
D I2C Fast Mode Compatible Interface
− Data Rates up to 400 kbit/s
− Input Voltage Levels Compatible with VDD
or 1.8 V Bus
D Register Set and Pin Compatible with the
TCS3x71 Series
D Small 2 mm y 2.4 mm Dual Flat No-Lead
(FN) Package
TCS3472
COLOR LIGHT-TO-DIGITAL CONVERTER
with IR FILTER
TAOS135 − AUGUST 2012
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
VDD 1
SCL 2
GND 3
6 SDA
5 INT
4 NC
Package Drawing Not to Scale
Applications
D RGB LED Backlight Control
D Light Color Temperature Measurement
D Ambient Light Sensing for Display
Backlight Control
D Fluid and Gas Analysis
D Product Color Verification and Sorting
End Products and Market Segments
D TVs, Mobile Handsets, Tablets, Computers,
and Monitors
D Consumer and Commercial Printing
D Medical and Health Fitness
D Solid State Lighting (SSL) and Digital
Signage
D Industrial Automation
Description
The TCS3472 device provides a digital return of red, green, blue (RGB), and clear light sensing values. An IR
blocking filter, integrated on-chip and localized to the color sensing photodiodes, minimizes the IR spectral
component of the incoming light and allows color measurements to be made accurately. The high sensitivity,
wide dynamic range, and IR blocking filter make the TCS3472 an ideal color sensor solution for use under
varying lighting conditions and through attenuating materials.
The TCS3472 color sensor has a wide range of applications including RGB LED backlight control, solid-state
lighting, health/fitness products, industrial process controls and medical diagnostic equipment. In addition, the
IR blocking filter enables the TCS3472 to perform ambient light sensing (ALS). Ambient light sensing is widely
used in display-based products such as cell phones, notebooks, and TVs to sense the lighting environment and
enable automatic display brightness for optimal viewing and power savings. The TCS3472, itself, can enter a
lower-power wait state between light sensing measurements to further reduce the average power consumption.
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




TAOS

TCS34725 Datasheet Preview

TCS34725 Datasheet

COLOR LIGHT-TO-DIGITAL CONVERTER

No Preview Available !

TCS3472
COLOR LIGHT-TO-DIGITAL CONVERTER
with IR FILTER
TAOS135 − AUGUST 2012
Functional Block Diagram
VDD
IR-Blocking
Filter
Wait Control
Interrupt
INT
RGBC Control
Upper Limit
SCL
Clear
Red
Clear ADC Clear Data
Red ADC Red Data
Lower Limit
Green ADC Green Data
Green
SDA
GND
Blue ADC Blue Data
Blue
Detailed Description
The TCS3472 light-to-digital converter contains a 3 × 4 photodiode array, four analog-to-digital converters
(ADC) that integrate the photodiode current, data registers, a state machine, and an I2C interface. The 3 × 4
photodiode array is composed of red-filtered, green-filtered, blue-filtered, and clear (unfiltered) photodiodes.
In addition, the photodiodes are coated with an IR-blocking filter. The four integrating ADCs simultaneously
convert the amplified photodiode currents to a 16-bit digital value. Upon completion of a conversion cycle, the
results are transferred to the data registers, which are double-buffered to ensure the integrity of the data. All
of the internal timing, as well as the low-power wait state, is controlled by the state machine.
Communication of the TCS3472 data is accomplished over a fast, up to 400 kHz, two-wire I2C serial bus. The
industry standard I2C bus facilitates easy, direct connection to microcontrollers and embedded processors.
In addition to the I2C bus, the TCS3472 provides a separate interrupt signal output. When interrupts are
enabled, and user-defined thresholds are exceeded, the active-low interrupt is asserted and remains asserted
until it is cleared by the controller. This interrupt feature simplifies and improves the efficiency of the system
software by eliminating the need to poll the TCS3472. The user can define the upper and lower interrupt
thresholds and apply an interrupt persistence filter. The interrupt persistence filter allows the user to define the
number of consecutive out-of-threshold events necessary before generating an interrupt. The interrupt output
is open-drain, so it can be wire-ORed with other devices.
Copyright E 2012, TAOS Inc.
2
r
www.taosinc.com
The LUMENOLOGY r Company
r


Part Number TCS34725
Description COLOR LIGHT-TO-DIGITAL CONVERTER
Maker TAOS
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TCS34725 Datasheet PDF






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