Ambient light sensor for intelligent daylight harvesting
Developed by TAOS, the sensor family offers a wide sensitivity range from 3 lux to 220,000 lux, preventing saturation even in direct sunlight, while implementing a photopic response model that spectrally matches light perception in the human eye. The TSL4531 ambient light sensor provides a simple, direct lux output and a 16-bit digital interface. Sophisticated filters automatically reject the 50-60Hz ripple typically produced by a building’s fluorescent lighting systems, enabling the sensed light levels to more accurately measure the daylight that is entering the building.
Daylight harvesting is the next major step in the development of integrated lighting systems, enabling luminaires to dim in response to the amount of outside light that is entering a building through windows or skylights.
By supplementing the working space with only the amount of light needed to maintain a uniformly lit environment, energy savings of 30% or more can be realized when compared to existing installations which do not respond to changes in ambient light. The TSL4531 approximates the human eye’s spectral response in diverse lighting conditions, it has three user-selectable integration times: 400ms, 200ms, and 100ms. The device has a low active current of 110µA typical, with a power down mode of 2.2µA typical. The chip has offers a 16-bit digital output compatible with I2C interface, it comes in a 2x2mm ChipLED package. Operation is from a 2.5V supply voltage with 1.8V logic interface.
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