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AS7221

Smart Lighting Command Interface

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 37

Command

Direction

Description

Format

Value Range

Default

PWM Configuration and Overrides

ATDIM

R/W

Set dim level in percent

(0% off, 100% full

brightness)

DEZ

– 100

ATBLINK

R/W

Starts the light on a

low-high-low output

blink to allow

identification during a

commissioning or

maintenance process

DEZ

1: ON, 0: OFF

ATLOG

R/W

Set alternate dimming

curve (DALI

approximation)

DEZ

1: Logarithmic

0: Linear

ATRAMP

R/W

Set ramp time for

lighting adjustments in

percent. Time

configuration is used

for ATXPWM, ATDIM,

ATLED23M,

occupancy and Light

on/off

DEZ

0: No ramp used

– 100: Ramp time in percent (1s - 10s)

Example:

DIM 50%

– 0% with ATRAMP=50 takes

2.5 s

ATPWMFREQ

R/W

Set/Get the PWM

frequency in Hertz,

SYNC-Input is only at

886 Hz enabled

DEZ

100

– 4000 Hz

886

ATPWMx

R/W

Set PWMx Duty Cycle

target as an integer

percentage value

between 0 and 100,

removing it from any

control loop. Returns

always the current

configured PWM value

in perc

ent (x = 1 … 3)

DEZ

– 100

102 - Release PWM back into loop control

PWM1: 0

PWM2:

PWM3:

ATXPWMx

R/W

Set PWMx Duty Cycle

target as an integer

percentage value

between 0 and 100,

removing it from any

control loop. Returns

always the current

configured PWM value

in percent. Note: A

PWM in an XPWM

override mode will be

affected by the DIM pin

value when AUX is in

DIM mode. In AUX

mode it is also affected

by the AUX pin value.

(x = 1 .. 3)

DEZ

– 100

102 - Release PWM back into loop control

PWM1: 0

PWM2:

PWM3:

ATPWMOVR

Read the single 16-bit

sum of PWMs to

identify which have

been over-ridden and

removed from any

closed-loop control

loop

HEX

Bit0: ATXPWM1 active

Bit1: ATXPWM2 active

Bit2: ATXPWM3 active

Bit4: ATPWM1 active

Bit5: ATPWM2 active

Bit6: ATPWM3 active

0x00

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