ams announced the AS7225 tuneable-white lighting smart system sensor, allowing OEM lighting manufacturers to access closed-loop CCT tuning and daylight compensation while retaining the existing host microprocessor architecture in their smart lighting design. The result is higher precision, more flexible LED binning, and lower system costs for tuneable white lighting systems.
The AS7225 is equipped with an embedded tri-stimulus CIE XYZ colour sensor to enable precise colour sensing with direct mapping to the International Commission on Illumination (CIE) 1931 colour space which is recognised as the standard coordinate definition for human colour perception. CCT and daylighting tuning directives are communicated to the host microprocessor via an industry-standard I²C interface, allowing IoT smart lighting manufacturers to avoid costly calibration and tuning algorithm development.
The chip is available in a 4,5 x 4,7 mm LGA package for flexible integration into luminaires, light engines and larger replacement lamps, such as LED linear T-LED products. The device provides precise CCT tuning direction between configured warm and cool white LED strings within a luminaire. In addition to the CCT- tuning functions, the AS7225 can additionally be used looking outward in luminaire designs to provide precise daylight management, or can deliver combined CCT tuning and daylighting directives by the addition of ams’ TSL4531 ambient light sensor.
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