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Sensors offer improved ALS, proximity detection

Posted: 06 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:sensors? ALS? proximity detection?

Texas Advanced Optoelectronic Solutions Inc. (TAOS) has released its fifth-generation sensor family, the TSL2x72 series. The released series is specially designed to create wide dynamic range of operation necessary for mobile products to adapt to all lighting conditions.

The TSL2x72 series enhances the dynamic range of mobile products by providing ALS and proximity detection operation in environments over 60,000lux (sunlight). The TSL2x72's programmable gain modes also help in improving the dynamic range. Proximity detection enhancements consist of increased signal-to-noise performance and a programmable register that allows compenzation for optical signal crosstalk. The TSL2x72 sensors have an automatic power-down mode after interrupt, which provides a 'run-once' capability, and further reduces system power consumption.

The sensors are based on TAOS' dual-diode architecture that enables devices to produce accurate ALS and proximity detection results when operating behind spectrally distorting glass regardless of the lighting sources (e.g. sunlight, fluorescent) and intensity. These features increase energy efficiency, extend battery life and improve the end-user experience, TAOS said.

The TSL2x72 series of devices are register set, footprint and pin compatible with the prior generation of TAOS devices, the TSL2x71 series. Existing TSL2x71 designs can migrate to the TSL2x72 while minimizing hardware and software design and development efforts. The TSL2x72 sensors incorporate an IR LED current-limited driver, analog-to-digital conversion (ADC), interrupt capability, multiple I2C interface voltage options (3.0V or 1.8V) and flexible programming allowing it to be configured into many different applications.

The TSL2x72 series is designed for mobile devices but also has applications in HDTVs, computers, and other consumer electronic products. Proximity detection is can be used for notebook and desktop computers to automatically turn off the display to conserve energy. Other emerging applications for proximity sensing technology include touchless display controls for netbooks, tablets, HDTVs, toys, office equipment, industrial controls and others. In addition, the TSL2x72 series 'light-to-digital' sensor family can be used in general non-display application where a high-sensitivity light sensor is required using an I2C interface.

TAOS is providing evaluation modules (EVMs) and software support for device drivers and/or C-reference code (including support for Android and Chrome OS). The devices are packaged in 2 x 2mm dual flat no-lead (FN) package. Samples are available now with production quantities available in 4Q11. Pricing for the TSL25721FN, TSL26721FN and TSL27721FN is $0.67, $0.70 and $1.07, respectively, in quantities of 1,000.

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