TCS3771 Color Light-To-Digital Converter with Proximity Sensing The TCS3771 family of devices provides red, green, blue, and General Description clear (RGBC) light sensing and proximity detection (when coupled with an external IR LED). They detect light intensity under a variety of lighting conditions and through a variety of attenuation materials. The proximity detection feature allows a large dynamic range of operation for use in short distance detection behind dark glass such as in a cell phone or for longer distance measurements for applications such as presence detection for monitors or laptops. The programmable proximity detection enables continuous measurements across the entire range. In addition, an internal state machine provides the ability to put the device into a low power mode in between RGBC and proximity measurements providing very low average power consumption. The TCS3771 is directly useful in lighting conditions containing minimal IR content such as LED RGB backlight control, reflected LED color sampler, or fluorescent light color temperature detector. With the addition of an IR blocking filter, the device is an excellent ambient light sensor, color temperature monitor, and general purpose color sensor. The proximity function is targeted specifically towards battery-powered mobile devices, LCD monitor, laptop, and flat-panel television applications. In cell phones, the proximity detection can detect when the user positions the phone close to their ear. The device is fast enough to provide proximity information at a high repetition rate needed when answering a phone call. It can also detect both close and far distances so the application can implement more complex algorithms to provide a more robust interface. In laptop or monitor applications, the product is sensitive enough to determine whether a user is in front of the laptop using the keyboard or away from the desk. This provides both improved green power saving capability and the added security to lock the computer when the user is not present. Ordering Information and Content Guide appear at end of datasheet. ams Datasheet Page 1 v1-31 2018-Apr-04 Document FeedbackT C S3 771 Gen e ra l De s c rip t ion Key Benefits & Features The benefits and features of the TCS3771 are listed below: Figure 1: Added Value of using TCS3771 Benefits Features Single Device reduces board space RGB Color Sensing and Proximity Detection in a Single Device Color Light Sensing Programmable Analog Gain, Integration Time, and Enables both Correlated Color Interrupt Function with Upper and Lower Thresholds Temperature and Ambient Light Resolution Up to 16 bits Sensing across wide range of lighting Very High Sensitivity - Ideally Suited for Operation Behind condition applications Dark Glass Up to 1,000,000:1 Dynamic Range Proximity Detection Programmable Number of IR Pulses, Current Sink for the IR Enables versatile Infra-red proximity LED - No Limiting Resistor Needed, and Interrupt Function based object detection with Upper and Lower Thresholds Covers a 2000:1 Dynamic Range Low Power Wait State Low power wait state programmability reduces average 65A Typical Current power consumption Wait Timer is Programmable from 2.4ms to > 7 seconds 2 I C Interface Compatible Digital interfaces are less susceptible to noise 2 Up to 400kHz (I C Fast Mode) Reduces micro-processor Interrupt Overhead with both up persist and Dedicated Interrupt Pin no-persist interrupt thresholds Enables drop-in and foot-print Pin and Register Set Compatible with the TCS3x7x Family of compatible solutions Devices Reduces board space requirements Small 2mm 2.4mm Dual Flat No-Lead Package while simplifying designs Low power sleep state reduces Sleep Mode - 2.5A Typical Current average power consumption Applications The applications of TCS3771 include: RGB LED Backlight Control Ambient Color Temperature Sensing Cell Phone Touch Screen Disable Notebook/Monitor Security Automatic Menu Popup Page 2 ams Datasheet Document Feedback v1-31 2018-Apr-04