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AS7221

Functional Description

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 16

Figure 11:

AS7221 Workflow Abstract

The AS7221 does not include embedded operating code. Initial programming of an installed,

compatible Flash memory device must be accomplished external to the SLM at the time of end-

product manufacturing to enable an initial functional state. Options include programming with a JTAG

or serial programmer (e.g. FlashCat USB) or working with a components distributor or device

programming service company for preprogramming devices. After initial programming, over-the-

air/over-the-wire operating image updates are supported by commands in the Smart Lighting

Command Set.

A binary image software configuration tool is available from ams to allow the luminaire, lamp or driver

anufacturer to create their own “factory default” conditions that will be integrated with the ams–

supplied initial binary image to create a ready-to-program default Flash image. The configuration tool

is available from https://download.ams.com (see Smart Lighting Command Interface section).

XYZ color point response is accomplished via standard observer interference filters, which are

extremely stable over time and temperature. To ensure accuracy, the AS7221 LGA package contains

an internal aperture that limits the sensor package field of view (PFOV) of ± 20.5°, as shown in

Figure 10. External optics can be used as needed to expand or reduce this built in PFOV.

1-channel

constant

current

LED driver

Flash

optional

Daylight Sensor

Ambient LUX

Measurement

(outwards

looking sensor)

CCT and/or LUX Measurement

(inwards looking)

DIM or

LUX target

AUX or

OCC or

CCT target

DIM

(ATDMD=0)

Lux

(ATDMD=1)

Coefficient

calculation

Daylight

algorithm

RAMP

Generator

(ATBLINK,

ATRAMP)

PWM 1

Min/Max

Settings

DIM range

(ATDMIN,

ATDMAX)

Target LUX

calculation

(ATDMINLUX,

ATDMAXLUX)

RAMP

Generator

(ATBLINK,

ATRAMP)

PWM 2

PWM 3

ATDL=0

ATDL=1

Mode=2

RAMP

Generator

(ATBLINK,

ATRAMP)

Min/Max

Settings

CCT range

(ATXMIN,

ATXMAX)

AUX

Coefficient

calculation

(ATXMD=0)

OCC

Threshold

detect

(ATXMD=1)

CCT

Target CCT

calculation

(ATXMD=2)

Timer

(ATLIGHT=0/1)

AUX or OCC or

CCT

(ATXMD)

Color Tuning

Algorithm

AUX_FACTOR

calculation

UART

CCT

CCT preselect

(ATXMD=3)

DIM_LIMIT

X%...100%

(ATDMLTL)

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