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SFH2430 Datasheet(PDF) 1 Page - OSRAM GmbH |
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SFH2430 Datasheet(HTML) 1 Page - OSRAM GmbH |
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1 / 8 page  29.06.2006 page 1 of 8 Ambient Light Sensors General Application Note Abstract This application note introduces ambient light sensing on a general level. The different types of ambient light sensors are described and related to specific applications. Introduction OSRAM OS offers a variety of ambient light sensors. This application note introduces the basic facts of ambient light sensing and describes the characteristics of various ambient light sensors. Detailed application notes for specific sensor types are available. Applications for ambient light sensors Ambient light sensors are photo detectors which are designed to perceive brightness in the same way as human eyes do. They are used wherever the settings of a system have to be adjusted to the ambient light conditions as perceived by humans. The below list describes typical applications for ambient light sensors: • Saving battery power. Ambient light sensors provide power saving solutions for hand-held electronic devices such as PDAs, mobile phones and notebook PCs. Nearly all LCD displays and keypads have backlighting. Studies have shown that backlighting is only required about 40% of the time. An automatic adjustment (auto dimming) of the backlight offers considerable power savings. • Automatic dimming of flat panel displays such as LCD screens to maintain the same display appearance under all lighting conditions from darkness to bright sunlight. • Automatic dimming of instruments in automobiles to ensure reliable visibility under all circumstances. • Automatic dimming of lamps for office buildings, exterior lightings and traffic signals. • Headlamp control in cars improves road safety by automatically turning on the lights in twilight or when entering a tunnel. Basic facts about ambient light sensing Brightness Brightness is a term that describes how intense a light source is perceived by the human eye. Brightness is measured in units called “LUX”. Light sources with the same LUX level appear at the same brightness to the human eye. Table 1 shows the bright- ness (LUX measurement) of some everyday light sources. The technical term for brightness is illuminance. Light source brightness [Lux] candle (1m distance) 1 street light 20 office desk lighting 750 overcast day 3000 overcast sunny day 20 000 direct sunlight 100 000 Table 1: Lux measurement of every day light sources. Spectral sensitivity Spectral sensitivity relates to where on the light spectrum a sensor is most effective. |
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