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AS7221

General Description

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 3

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

AS7221

1’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.

1.1

Key Benefits & Features

The benefits and features of AS7221, CCT Tuning Smart Lighting Manager, are listed below:

Figure 1:

Added Value of Using the AS7221

Benefits

Features

Lowers overall manufactured costs and adds

precision to tunable white luminaires and lamps

Intelligent controller with integrated, calibrated

XYZ Tristimulus Sensor (CIE 1931 Standard

Observer Color Function)

AS7221 数据表(PDF) 4 Page - OSRAM GmbH

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