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AS7221

Smart Lighting Command Interface

Datasheet

• PUBLIC

DS000479

• v4-00 • 2019-Jun-28

│ 41

Command

Direction

Description

Format

Value Range

Default

ATLXSL1

R/W

Reads and writes the

calibration scalar K1 for

external ambient light

sensor (TSL2572 only);

Formula K0>0:

LUX=K0*ADC0-

K1*ADC1

K0=0:

LUX=K1*ADC1

DEZ

≥0

Firmware and Firmware Update

ATVERSW

Return the current

software version

number

DEZ

<MAJOR.MINOR.PATCH>

ATVERHW

Returns the system

hardware as a HEX

value of the form

PRDTx where

P=PartID and

R=ChipRevision and

DT= DeviceType

HEX

<0xPRDT>

PR: 40

DT: 15 (AS7221)

0x4015

ATFWU

Starts firmware update

process and transfer

the bin file checksum

ATFW

Download new

firmware

Up to 10 bytes of FW

image at a time (20 hex

bytes with no leading

or trailing 0x)

Repeat command till all

56Kbytes of firmware

are downloaded

HEX STRING (without 0x)

ATFWS

Tests the checksum on

the non-active FW

partition and, if correct,

switches active

partition. This is a

toggle and can be used

to toggle between the 2

FW partitions. Note:

the first 5 bytes in page

0 are not touched. It is

only a temporary

switch and must be

used to check the new

firmware whether the

communication works!

ATFWL

This command locks

the current firmware to

starts on power cycles.

It rewrites the first five

bytes in page0!

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