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Technical content
TAOS Inc. is now ams AG The technical content of this TAOS datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30
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COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 The LUMENOLOGY /C0114 Company /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. www.taosinc.com
Features
/C0068Red, 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 /C0068Maskable Interrupt − Programmable Upper and Lower Thresholds with Persistence Filter /C0068Power Management − Low Power — 2.5-/C0109A Sleep State − 65-/C0109A Wait State with Programmable Wait State Time from 2.4 ms to > 7 Seconds /C0068I2C Fast Mode Compatible Interface − Data Rates up to 400 kbit/s − Input Voltage Levels Compatible with VDD or 1.8 V Bus /C0068Register Set and Pin Compatible with the TCS3x71 Series /C0068Small 2 mm /C0121 2.4 mm Dual Flat No-Lead (FN) Package
Applications
/C0068RGB LED Backlight Control /C0068Light Color Temperature Measurement /C0068Ambient Light Sensing for Display Backlight Control /C0068Fluid and Gas Analysis /C0068Product Color Verification and Sorting End Products and Market Segments /C0068TVs, Mobile Handsets, Tablets, Computers, and Monitors /C0068Consumer and Commercial Printing /C0068Medical and Health Fitness /C0068Solid State Lighting (SSL) and Digital Signage /C0068Industrial 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. /C0114 /C0114 Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road /C0083 Suite 300 /C0083 Plano, TX 75074 /C0083 (972) 673-0759
Package Drawing Not to Scale PACKAGE FN DUAL FLAT NO-LEAD (TOP VIEW)
6 SDA
5 INT
V DD 1 SCL 2 GND 3 ams AG Technical content still valid
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. The LUMENOLOGY /C0114 Company www.taosinc.com Functional Block Diagram SDA VDD INT SCL Wait Control Clear ADC Upper Limit Lower Limit Interrupt I2C Interface GND Red ADC Green ADC Blue ADC Clear Data Red Data Green Data Blue Data RGBC Control Blue Green Red Clear IR-Blocking Filter 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 I 2C serial bus. The industry standard I2C bus facilitates easy, direct connection to microcontrollers and embedded processors. In addition to the I 2C 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. ams AG Technical content still valid
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 The LUMENOLOGY /C0114 Company /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. www.taosinc.com Terminal Functions TERMINAL TYPE DESCRIPTIONNAME NO. TYPE DESCRIPTION GND 3 Power supply ground. All voltages are referenced to GND. INT 5 O Interrupt — open drain (active low). NC 4 O No connect — do not connect. SCL 2 I I2C serial clock input terminal — clock signal for I 2C serial data. SDA 6 I/O I2C serial data I/O terminal — serial data I/O for I 2C . VDD 1 Supply voltage. Available Options DEVICE ADDRESS PACKAGE − LEADS INTERFACE DESCRIPTION ORDERING NUMBER TCS34721† 0x39 FN−6 I2C Vbus = VDD Interface TCS34721FN TCS34723† 0x39 FN−6 I2C Vbus = 1.8 V Interface TCS34723FN TCS34725 0x29 FN−6 I2C Vbus = VDD Interface TCS34725FN TCS34727 0x29 FN−6 I2C Vbus = 1.8 V Interface TCS34727FN † Contact TAOS for availability. Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)† † 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, VDD (TCS34721 & TCS34725) (I2C Vbus = VDD) 2.7 3 3.6 V Supply voltage, VDD (TCS34723 & TCS34727) (I2C Vbus = 1.8 V) 2.7 3 3.3 V Operating free-air temperature, TA −30 70 °C ams AG Technical content still valid
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. The LUMENOLOGY /C0114 Company www.taosinc.com Operating Characteristics, VDD = 3 V, TA = 25/C0053C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Active 235 330 IDD Supply current Wait state 65 μAIDD Supply current Sleep state — no I 2C activity 2.5 10 μA V INT SDA output low voltage 3 mA sink current 0 0.4 VVOL INT, SDA output low voltage 6 mA sink current 0 0.6 V ILEAK Leakage current, SDA, SCL, INT pins −5 5 μA ILEAK Leakage current, LDR pin −5 5 μA V SCL SDA input high voltage TCS34721 & TCS34725 0.7 VDD VVIH SCL, SDA input high voltage TCS34723 & TCS34727 1.25 V V SCL SDA input low voltage TCS34721 & TCS34725 0.3 VDD VVIL SCL, SDA input low voltage TCS34723 & TCS34727 0.54 V Optical Characteristics, VDD = 3 V, TA = 25/C0053C, AGAIN = 16/C0121, ATIME = 0xF6 (unless otherwise noted) (Note 1) PARAMETER TEST Red Channel Green Channel Blue Channel Clear Channel UNITPARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNIT λD = 465 nm Note 2 0% 15% 10% 42% 65% 88% 11.0 13.8 16.6 Re Irradiance responsivity λD = 525 nm Note 3 4% 25% 60% 85% 10% 45% 13.2 16.6 20.0 counts/ μW/ cm2responsivity λD = 615 nm Note 4 80% 110% 0% 14% 5% 24% 15.6 19.5 23.4 cm2 NOTES: 1. The percentage shown represents the ratio of the respective red, green, or blue channel value to the clear channel valu e. 2. The 465 nm input irradiance is supplied by an InGaN light-emitting diode with the following characteristics: dominant wavelength λD = 465 nm, spectral halfwidth Δλ½ = 22 nm. 3. The 525 nm input irradiance is supplied by an InGaN light-emitting diode with the following characteristics: dominant wavelength λD = 525 nm, spectral halfwidth Δλ½ = 35 nm. 4. The 615 nm input irradiance is supplied by a AlI nGaP light-emitting diode with the following characteristics: dominant wavelength λD = 615 nm, spectral halfwidth Δλ½ = 15 nm. RGBC Characteristics, VDD = 3 V, TA = 25/C0053C, AGAIN = 16/C0121, AEN = 1 (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Dark ADC count value Ee = 0, AGAIN = 60×, ATIME = 0xD6 (100 ms) 0 1 5 counts ADC integration time step size ATIME = 0xFF 2.27 2.4 2.56 ms ADC number of integration steps (Note 5) 1 256 steps ADC counts per step (Note 5) 0 1024 counts ADC count value (Note 5) ATIME = 0xC0 (153.6 ms) 0 65535 counts Gi l i lt i t 1 × i 4× 3.8 4 4.2 Gain scaling, relative to 1× gain 16× 15 16 16 8 /C0121Gain scaling, relative to 1× gain setting 16× 15 16 16.8 /C0121setting 60× 58 60 63 /C0121 NOTE 5: Parameter ensured by design and is not tested. ams AG Technical content still valid
Copyright /C0069 2012, TAOS Inc. NOTE 1: Parameter ensured by design and is not tested. † Specified by design and characterization; not production tested. Figure 1. Timing Diagrams
Copyright /C0069 2012, TAOS Inc. An internal state machine provides system control of the RGBC and power management features of the device. At power up, an internal power-on-reset initializes the device and puts it in a low-power Sleep state. Enable Register (0x00) PON bit. If PON is disabled, the device will return to the Sleep state to save power. Figure 6. Simplified State Diagram
transfer, the device automatically moves to the next state in accordance with the configured state machine. Figure 7. RGBC Operation the power on (PON) is in register 0x00, bit 0. This is represented as PON (r0x00:b0).
Copyright /C0069 2012, TAOS Inc. interrupt enable (AIEN) field in the enable register (0x00). or is greater than the Clear interrupt high threshold (AIHTx). the low threshold is evaluated. the user to specify the number of consecutive out-of-range Clear occurrences before an interrupt is generated. interrupt, it will continue until a special function interrupt clear command is received (see command register). Figure 8. Programmable Interrupt
machine cycle time, and provides details to determine system level timing. formula to determine the wait time is given in the box associated with the Wait state in Figure 9. is generated as a result of the RGBC cycle, it will be asserted at the end of the RGBC ADC. Notes: 1. There is a 2.4 ms warm-up delay if PON is enabled. If PON is not enabled, the device will return to the Sleep state as shown.
- PON, WEN, and AEN are fields in the Enable register (0x00).
Figure 9. Detailed State Diagram
Copyright /C0069 2012, TAOS Inc. in the example, average IDD is estimated to be 152 μA. Table 1. Power Management current occurs when the Wait state is not enabled. Table 2. Average IDD Current
The I2C standard provides for three types of bus transaction: read, write, and a combined protocol (Figure 10). commands can also be used to clear interrupts. review the NXP I2C design specification at http://www.i2c−bus.org/references/. Figure 10. I2C Protocols
Copyright /C0069 2012, TAOS Inc. of the ADC conversions. The register set is summarized in Table 3. Table 3. Register Address control-status-data register for subsequent read/write operations.
The command register specifies the address of the target register for future write and read operations. Table 4. Command Register CMD 7 Select Command Register. Must write as 1 when addressing COMMAND register.
00 Repeated byte protocol transaction
01 Auto-increment protocol transaction
10 Reserved — Do not use
11 Special function — See description below
Byte protocol will repeatedly read the same register with each data access. Block protocol will provide auto-increment function to read successive bytes.
00110 Clear channel interrupt clear
The Clear channel interrupt clear special function clears any pending interrupt and is self-clearing.
Copyright /C0069 2012, TAOS Inc. interrupts as shown in Table 5. Table 5. Enable Register Reserved 7:5 Reserved. Write as 0. AIEN 4 RGBC interrupt enable. When asserted, permits RGBC interrupts to be generated. Reserved 2 Reserved. Write as 0. PON 1, 2 0 Power ON. This bit activates the internal oscillator to permit the timers and ADC channels to operate. Writing a 1 activates the oscillator. Writing a 0 disables the oscillator. NOTES: 1. See Power Management section for more information.
- A minimum interval of 2.4 ms must pass after PON is asserted before an RGBC can be initiated.
2.4-ms increments. Max RGBC Count = (256 − ATIME) × 1024 up to a maximum of 65535. Table 6. RGBC Timing Register longer. WTIME is programmed as a 2’s complement number. Table 7. Wait Time Register
Copyright /C0069 2012, TAOS Inc. lower threshold specified, or above the higher threshold, an interrupt is asserted on the interrupt pin. Table 8. RGBC Interrupt Threshold Registers that is outside of the values specified by the threshold register for some specified amount of time. Table 9. Persistence Register APERS 3:0 Interrupt persistence. Controls rate of interrupt to the host processor.
0000 Every Every RGBC cycle generates an interrupt
The configuration register sets the wait long time. Table 10. Configuration Register Reserved 7:2 Reserved. Write as 0. Reserved 0 Reserved. Write as 0. functions such as gain settings and/or diode selection. Table 11. Control Register AGAIN 1:0 RGBC Gain Control. The ID Register provides the value for the part number. The ID register is a read-only register. Table 12. ID Register
Copyright /C0069 2012, TAOS Inc. The Status Register provides the internal status of the device. This register is read only. Table 13. Status Register AINT 4 RGBC clear channel Interrupt. AVALID 0 RGBC Valid. Indicates that the RGBC channels have completed an integration cycle. integration cycles end between the reading of the lower and upper registers. Table 14. ADC Channel Data Registers
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 The LUMENOLOGY /C0114 Company /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. www.taosinc.com
PACKAGE INFORMATION
PACKAGE FN Dual Flat No-Lead 2000 /C0043 75 2400 /C0043 75 Photodiode Array Area 2400 /C0043 75 871 /C0043 75 203 /C0043 8 V DD 1 SCL 2 GND 3 TOP VIEW SIDE VIEW BOTTOM VIEW Lead Free Pb 300 /C0043 50 PIN 1 END VIEW 650 /C0043 50 PIN OUT TOP VIEW 750 /C0043 100 650 /C0043 50 PIN 1 300 /C0043 50 650 /C0043 50 877 /C0043 75 406 369 295 nominal NOTES: A. All linear dimensions are in micrometers. Dimension tolerance is ± 20 μm unless otherwise noted. B. The die is centered within the package within a tolerance of ± 3 mils. C. Package top surface is molded with an electrically nonconductive clear plastic compound having an index of refraction of 1.55 . D. Contact finish is copper alloy A194 with pre-plated NiPdAu lead finish. E. This package contains no lead (Pb). F. This drawing is subject to change without notice. Figure 12. Package FN — Dual Flat No-Lead Packaging Configuration
NOTES: A. All linear dimensions are in millimeters. Dimension tolerance is ± 0.10 mm unless otherwise noted. B. The dimensions on this drawing are for illustrative purposes only. Dimensions of an actual carrier may vary slightly. C. Symbols on drawing A o, Bo, and Ko are defined in ANSI EIA Standard 481−B 2001. D. Each reel is 178 millimeters in diameter and contains 3500 parts. E. TAOS packaging tape and reel conform to the requirements of EIA Standard 481−B. F. In accordance with EIA standard, device pin 1 is located next to the sprocket holes in the tape. G. This drawing is subject to change without notice. Figure 13. Package FN Carrier Tape
Copyright /C0069 2012, TAOS Inc. substrate. The process, equipment, and materials used in these test are detailed below. be limited to a maximum of three passes through this solder reflow profile. Table 15. Solder Reflow Profile Figure 14. Solder Reflow Profile Graph
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. The LUMENOLOGY /C0114 Company www.taosinc.com STORAGE INFORMATION Moisture Sensitivity Optical characteristics of the device can be adversely affected during the soldering process by the release and vaporization of moisture that has been previously absorbed into the package. To ensure the package contains the smallest amount of absorbed moisture possible, each device is dry-baked prior to being packed for shipping. Devices are packed in a sealed aluminized envelope called a moisture barrier bag with silica gel to protect them from ambient moisture during shipping, handling, and storage before use. The Moisture Barrier Bags should be stored under the following conditions: Temperature Range < 40° C Relative Humidity < 90% Total Time No longer than 12 months from the date code on the aluminized envelope if unopened. Rebaking of the reel will be required if the devices have been stored unopened for more than 12 months and the Humidity Indicator Card shows the parts to be out of the allowable moisture region. Opened reels should be used within 168 hours if exposed to the following conditions: Temperature Range < 30° C Relative Humidity < 60% If rebaking is required, it should be done at 50°C for 12 hours. The FN package has been assigned a moisture sensitivity level of MSL 3. ams AG Technical content still valid
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 The LUMENOLOGY /C0114 Company /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. www.taosinc.com PRODUCTION DATA — information in this document is current at publication date. Products conform to specifications in accordance with the terms of Texas Advanced Optoelectronic Solutions, Inc. standard warranty. Production processing does not necessarily include testing of all parameters. LEAD-FREE (Pb-FREE) and GREEN STATEMENT Pb-Free (RoHS) TAOS’ terms Lead-Free or Pb-Free mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TAOS Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br) TAOS defines Green to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). Important Information and Disclaimer The information provided in this statement represents TAOS’ knowledge and belief as of the date that it is provided. TAOS bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TAOS has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TAOS and TAOS suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. NOTICE Texas Advanced Optoelectronic Solutions, Inc. (TAOS) reserves the right to make changes to the products contained in this document to improve performance or for any other purpose, or to discontinue them without notice. Customers are advised to contact TAOS to obtain the latest product information before placing orders or designing TAOS products into systems. TAOS assumes no responsibility for the use of any products or circuits described in this document or customer product design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that the circuits are free of patent infringement. TAOS further makes no claim as to the suitability of its products for any particular purpose, nor does TAOS assume any liability arising out of the use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, INC. PRODUCTS ARE NOT DESIGNED OR INTENDED FOR USE IN CRITICAL APPLICATIONS IN WHICH THE FAILURE OR MALFUNCTION OF THE TAOS PRODUCT MAY RESULT IN PERSONAL INJURY OR DEATH. USE OF TAOS PRODUCTS IN LIFE SUPPORT SYSTEMS IS EXPRESSLY UNAUTHORIZED AND ANY SUCH USE BY A CUSTOMER IS COMPLETELY AT THE CUSTOMER’S RISK. LUMENOLOGY, TAOS, the TAOS logo, and Texas Advanced Optoelectronic Solutions are registered trademarks of Texas Advanced Optoelectronic Solutions Incorporated. ams AG Technical content still valid
COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER TAOS135 − AUGUST 2012 /C0114 /C0114 Copyright /C0069 2012, TAOS Inc. The LUMENOLOGY /C0114 Company www.taosinc.com ams AG Technical content still valid