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AS7225

General Description

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 3

General Description

The AS7225 is designed for use directly in tunable white luminaires, replacement lamps (bulbs) and

light-engines/modules. The AS7225 Smart Lighting Director incorporates an embedded digital tri-

stimulus chromatic calibrated for life nano-optic sensor providing direct CIE1931 XYZ and CIE 1976

u’v’ coordinate mapping. Adaptive algorithmic support enables a companion microprocess or to

implement closed-loop, autonomous adjustment of variable CCT and daylight responsive LED

lamps and luminaires. The AS7225 arrives pre-calibrated, and is designed for rapid integration into

white-tunable and daylight responsive luminaire designs, delivering directives to the local

microprocessor via an industry-standard I²C bus or UART interface.

An additional on-chip I²C master provides native support for select ams sensors, such as the

TSL25721 or TSL45315 for combining in-looking CCT tunable director functions with outward-

looking ambient light sensing and daylighting control. The AS7225

’s silicon via nano-optic deposited

interference filters deliver high-stability over both

time and temperature. The Director’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.

1.1

Key Benefits & Features

The benefits and features of AS7225, Calibrated XYZ Chromatic Smart Lighting Director, are listed

below:

Figure 1:

Added Value of Using AS7225

Benefits

Features

Provides accurate external host MCU

supervision of variable CCT and spectrally

tunable lighting

Integrated intelligence with XYZ tri-stimulus color

sensing for direct translation to CIE 1931

standard observer color map

Uses accurate XYZ sensed data to provide a

host MCU, with its own PWMs, simple to use

directives for closed loop tuned LED lighting

Automatically directs external warm and cool

white PWM controlled LED strings for chromatic

LED luminaire tuning. Also directs dimming

(combined with PWM color tuning)

Automatic spectral and lumen maintenance

over temperature and time

Supports autonomous color point and lumen

output adjustment resulting in automatic spectral

and lumen maintenance

Provides direct register or AT command based

access to closed loop tuning directives

I²C slave digital or UART Interface

AS7225 Scheda tecnica(PDF) 4 Page - ams-OSRAM AG

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