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AS7225

Functional Description

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 14

Functional Description

7.1

Calibrated XYZ Chromatic Smart Lighting Director

– Overview

By sensing a sample of the mixed warm and cool CCTs as either a reflection from the diffuser or other

light-guide/optical light gathering technique, the AS7225 serves as a calibrated chromatic smart

lighting director for a companion host MCU. Please note, that non-diffused applications require some

form of reflective or other light gathering that delivers an adequate sample of mixed light to the sensor.

Care should be taken to fulfill the angle of incidence requirements of the nano-optic filter set. Director

operation also provides selectable dimming information for either PWM-based or current-based

luminaire dimming designs.

Figure 11:

AS7225 Workflow Abstract

Waiting for trigger

Start Calculation

Measure current LUX

and CCT

Calculate diifferences

for LUX and CCT

Calculate new PWM

values

PWM calculation

finished

Sensor settings,

Learn:

Max CCT String 1

Max LUX String 1

Max CCT String 2

Max LUX String 2

Save max values

into flash,

Learning finished

Multi-channel

LED driver

Flash

optional

Daylight Sensor

Ambient LUX

Measurement

(outwards

looking sensor)

CCT and/or LUX Measurement

(inwards looking)

Start AS7225

measurement

(Set ATCALC=1)

Wait for calculation

(ATCALC =1)

Pickup new PWM

values

(When ATCALC=0)

Set new PWM

values

Set AS7225 settings,

Learn AS7225 and

set

max LUX & CCT of

string 1 and 2

ATLEARN

Waiting for mode

Ch 1

Ch 2

Ch 3

Set Mode

0 = DIM Ch1

1 = DIM Ch1 + CCT

Ch2 & Ch3

2 = DIM + CCT Ch2

& Ch3

(ATCHAN1..3)

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