TSL2771 Light-to-Digital Converter with Proximity Sensing The TSL2771 family of devices provides both ambient light General Description sensing (ALS) and proximity detection (when coupled with an external IR LED). The ALS approximates human eye response to 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 ALS and proximity measurements providing very low average power consumption. While useful for general purpose light sensing, the device is particularly useful for display management with the purpose of extending battery life and providing optimum viewing in diverse lighting conditions. Display panel and keyboard backlighting can account for up to 30 to 40 percent of total platform power. The ALS features are ideal for use in tablets, notebook PCs, LCD monitors, flat-panel televisions, and cell phones. The proximity function is targeted specifically towards cell phone, 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 v1-00 2016-Mar-22 Document FeedbackT S L2 771 Gen e ra l De s c rip t ion Key Benefits & Features The benefits and features of TSL2771, Light-to-Digital Converter with Proximity Sensing are listed below: Figure 1: Added Value of Using TSL2771 Benefits Features Enables Operation in IR Light Environments Patented Dual-Diode Architecture Enables Operation in 10k Lux Sunlight and Accurate 1M:1 Dynamic Range Sensing Behind Spectrally Distorting Materials Allows Multiple Power-Level Selection Without Programmable LED Drive Current External Passives Reduces Micro-Processor Interrupt Overhead Programmable Interrupt Function Reduces board Space Requirements while Simplifying Area Efficient 2mm x 2mm Dual Flat No-Lead Designs (FN) Package Ambient Light Sensing and Proximity Detection in a Single Device Ambient Light Sensing (ALS) Approximates Human Eye Response Programmable Analog Gain Programmable Integration Time Programmable Interrupt Function with Upper and Lower Threshold Resolution Up to 16 Bits Very High Sensitivity Operates Well Behind Darkened Glass Up to 1,000,000:1 Dynamic Range Proximity Detection Programmable Number of IR Pulses Programmable Current Sink for the IR LED No Limiting Resistor Needed Programmable Interrupt Function with Upper and Lower Threshold Covers a 2000:1 Dynamic Range Programmable Wait Timer Programmable from 2.72 ms to > 8 Seconds Wait State 65 mA Typical Current IC Interface Compatible Up to 400 kHz (IC Fast Mode) Dedicated Interrupt Pin Sleep Mode 2.5 mA Typical Current Page 2 ams Datasheet Document Feedback v1-00 2016-Mar-22