General Description
The AS7221 CCT Tuning Smart Lighting Manager device is part of the ams AS722x/1x Smart Lighting
Manager/Director family of products that simplify tunable and environmentally responsive lighting
designs, enable lights to be “aware” and adapt to their surroundings, and to autonomously serve
human-centered lighting and energy conservation needs. The device is equipped with an advanced
Cognitive Lighting Engine (CLE) to optimize, chromatic white tuning, daylight harvesting and lumen
maintenance via a combination of PWM and/or 0-10 V controls with dimming ballasts. Direct
connection to a local I/O network enables connectivity with standard occupancy sensors, dimmers or
communications bridges.
The AS7221 is designed for use directly in tunable white luminaires, replacement lamps (bulbs) and
light-engines/modules, or with a simple lightguide implementation, it can be incorporated directly into
an LED driver to enable a highly cost-competitive, high-accuracy warm/cool CCT tuning solution.
AS7221 XYZ chromatic white sensing provides mapping to x, y (z) of the CIE 1931 2-dimensional
color gamut coordinates and scales the coordinates to the CIE 1976 u’v’ coordinate system. The
AS72211’s silicon via nano-optic deposited interference filters deliver high-stability over both time and
temperature. The Manager’s integrated intelligence enables ams factory CCT calibration, which
mitigates chip to chip variation. By combining this factory calibration with a supported luminaire
design-level “application matrix”, an end luminaire design can often eliminate the need for light-by-light
calibration while delivering lifetime color control. With such a system calibration, accuracies within 2-4
Macadam steps are possible. The LGA package includes a built in aperture to control light entering
the sensor array. No additional optics are required.
The AS7221 connects to standard 0-10 V dimmers inputs and drives 0-10 V dimming ballasts/drivers
to enable a highly cost-effective white tunable current-steering luminaire design with a single-channel
constant current ballast. Direct PWM inputs can also interface to standard PWM-dimmable LED
drivers or multi-channel ballasts for constant voltage LED lighting architectures.
An UART interface is provided for configuration, control and management via a driverless, high-level
text base Smart Lighting Command Set.
Applications
● Commercial, retail, and residential CCT tunable LED lighting systems
● Cost-optimized tunable white LED drivers
● Higher precision replacement lamps/bulbs
● Intelligent, networked solid-state lighting management for variable CCT and daylight harvesting
● Integrated smart lighting control of variable CCT white lighting solutions
● Luminaires intended to meet California Title 24 daylighting requirements
● Networked lighting systems with IoT sensor expandability