Spectral tuning IoT smart lighting manager

November 30, 2016 // By Graham Prophet
An extension of the ams smart lighting manager family of ICs is designed for cost-effective, accurate, IoT-connected variable-CCT LED lighting.

The company ams (Premstaetten, Austria) has added the AS7221, an integrated white-tunable smart lighting manager. Lighting manufacturers designing with the AS7221 can integrate high-precision CCT, or “Kelvin-tuning”, capabilities into their Internet of Things (IoT) smart lighting offerings. The architecture, which includes an I²C extension interface, positions the AS7221 to deliver “Internet of Awareness” IoT sensor hub platform capabilities for sensing functions such as air quality, temperature, occupancy, and presence.

The AS7221 is equipped with an embedded tri-stimulus CIE XYZ colour sensor to enable precise colour sensing with direct mapping to the CIE 1931 colour space. This smart lighting manager is a fully integrated luminaire control system, compatible with standard 0-10V inputs and enabled for IoT connectivity and network control through standard clients such as Bluetooth Smart, ZigBee or WiFi, through a complete Smart Lighting Command Set. LED control for spectral tuning is implemented via direct PWM channel outputs, resulting in a high-precision solution that reduces development and integration time when compared with more bulky discrete component approaches. It enables control integration directly into the luminaires.

The AS7221 is the first extension to ams’ Cognitive Lighting smart lighting manager family. The AS7221 will be available in a 5 x 5 mm LGA package, for integration into both luminaires and larger replacement lamps. The device provides precise colour point tuning, smoothly controlling CCT transitions between configured warm and cool white LED strings within a luminaire. In addition to the colour- and CCT-tuning functions, the AS7221 includes automatic configuration support for ams’ TSL4531 ambient light sensor for turnkey daylighting capabilities.

“The next generation of lighting will be defined by three key characteristics: controllability, adaptation and connected architectures,” said Tom Griffiths, Senior Marketing Manager at ams. “With this latest entry, we are addressing the luminaire manufacturers’ critical time-to-market challenge for developing and deploying a spectrally tunable luminaire that is cost-effective, accurate, and which smoothly integrates into the Internet of Things”.

Features of the AS7221