Opto-Electronics


Digital light sensor

29 May 2013 Opto-Electronics

ams unveiled a new digital light sensor family that offers low-light sensitivity down to 0,000377 lux. Offering a wide 600 million:1 dynamic range up to 88 000 lux (bright sunlight), the TSL2591 device is targeted at ambient light sensing for displays as well as for a wide range of non-display applications.

Designs using lower-sensitivity light sensors face severe constraints and are forced to meet tight specifications governing the properties of the attenuating material they are placed behind, the physical placement of the sensor, and the minimum intensity of light it must be exposed to in order to deliver sufficiently accurate measurements.

The TSL2591 device family’s ultra-high sensitivity and wide dynamic range mean that it can deliver accurate and meaningful measurements even when exposed to extremely low light levels. This gives the designer the freedom to place the sensor away from the direct path of the light it is measuring and behind a wider variety of darkened glass or attenuating materials.

For display applications, the light sensor utilises a patented dual-photodiode architecture that provides extremely accurate ambient light measurements even when placed behind material attenuating as much as 99% of the visible light, while automatically compensating for the increased IR component. This enables a photopic response to ambient light intensity that mimics the human eye.

The device provides an interrupt feature that simplifies and improves system efficiency by eliminating the need to poll a sensor for a light intensity value. The primary purpose of the interrupt function is to detect a meaningful change in light intensity. Meaningful change can be defined by the user in terms of light intensity and time, or the persistence of a change in intensity.

The TSL2591 is a fully integrated light-to-digital sensor with dual analog-to-digital converters and an I²C interface. It offers programmable gain and programmable integration time.

For more information contact Gary de Klerk, NuVision Electronics, +27 (0)11 608 0144, gdeklerk@nuvisionelec.co.za, www.nuvisionelec.co.za



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