TCS3472 COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 AUGUST 2012 PACKAGE FN Features DUAL FLAT NO-LEAD Red, Green, Blue (RGB), and Clear Light (TOP VIEW) Sensing with IR Blocking Filter Programmable Analog Gain and V 1 6 SDA DD Integration Time 3,800,000:1 Dynamic Range SCL 2 5 INT Very High Sensitivity Ideally Suited for Operation Behind Dark Glass GND 3 4 NC Maskable Interrupt Programmable Upper and Lower Package Drawing Not to Scale Thresholds with Persistence Filter Power Management Applications Low Power 2.5- A Sleep State 65- A Wait State with Programmable Wait RGB LED Backlight Control State Time from 2.4 ms to > 7 Seconds Light Color Temperature Measurement 2 I C Fast Mode Compatible Interface Ambient Light Sensing for Display Data Rates up to 400 kbit/s Backlight Control Input Voltage Levels Compatible with V DD Fluid and Gas Analysis or 1.8 V Bus Product Color Verification and Sorting Register Set and Pin Compatible with the TCS3x71 Series Small 2 mm 2.4 mm Dual Flat No-Lead End Products and Market Segments (FN) Package TVs, Mobile Handsets, Tablets, Computers, and Monitors Consumer and Commercial Printing Medical and Health Fitness Solid State Lighting (SSL) and Digital Signage 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 Company Copyright 2012, TAOS Inc. Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road Suite 300 Plano, TX 75074 (972) 673-0759 www.taosinc.com 1TCS3472 COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 AUGUST 2012 Functional Block Diagram Interrupt INT Wait Control IR-Blocking V DD Filter Upper Limit RGBC Control SCL Clear ADC Clear Data Clear Lower Limit Red ADC Red Data Red Green ADC Green Data Green SDA Blue ADC Blue Data Blue GND Detailed Description The TCS3472 light-to-digital converter contains a 3 4 photodiode array, four analog-to-digital converters 2 (ADC) that integrate the photodiode current, data registers, a state machine, and an I C 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. 2 Communication of the TCS3472 data is accomplished over a fast, up to 400 kHz, two-wire I C serial bus. The 2 industry standard I C bus facilitates easy, direct connection to microcontrollers and embedded processors. 2 In addition to the I C 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 2012, TAOS Inc. The LUMENOLOGY Company 2 www.taosinc.com 2 I C Interface