Datasheet
DS000479
AS7221
CCT Tuning Smart Lighting Manager
v4-00 • 2019-Jun-28
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AS7221
Content Guide
Datasheet • PUBLIC
DS000479 • v4-00 • 2019-Jun-28
55 │ 2
Content Guide
1 General Description ....................... 3
1.1 Key Benefits & Features .............................. 3
1.2 Applications .................................................. 4
1.3 Block Diagram .............................................. 5
2 Ordering Information ..................... 6
3 Pin Assignment ............................. 7
3.1 Pin Diagram .................................................. 7
3.2 Pin Description ............................................. 8
4 Absolute Maximum Ratings .......... 9
5 Electrical Characteristics ............ 10
6 Optical Characteristics ................ 12
7 Functional Description ................ 15
7.1 Smart Lighting Manager – Overview .......... 15
7.2 XYZ Chromatic White Color Sensor .......... 18
7.3 Inputs .......................................................... 18
7.4 Synchronization and Reset ........................ 20
7.5 PWM Outputs ............................................. 21
7.6 Indicator LED .............................................. 22
8 I²C Master Interface ..................... 23
8.1 I²C Protocol ................................................ 23
8.2 I²C Write Access......................................... 24
8.3 I²C Read Access ........................................ 24
8.4 Timing Characteristics ................................ 26
8.5 Timing Diagrams ........................................ 27
9 UART Command Interface .......... 28
9.2 UART Protocol ........................................... 29
9.3 SPI Timing Characteristics ......................... 29
9.4 SPI Timing Diagrams ................................. 30
9.5 Serial Flash ................................................ 31
10 Smart Lighting Command
Interface ....................................... 32
10.1 AT Commands ........................................... 33
11 Application Information .............. 43
11.1 Schematic .................................................. 43
11.2 PCB Layout ................................................ 46
11.3 PCB Pad Layout......................................... 47
12 Package Drawings & Markings ... 48
13 Tape & Reel Information ............. 50
14 Soldering & Storage Information 51
14.1 Manufacturing Process Considerations ..... 52
14.2 Storage Information ................................... 52
14.3 Rebaking Instructions ................................ 53
15 Revision Information ................... 54
16 Legal Information ........................ 55
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AS7221
General Description
55 │ 3
1 General Description
The AS7221 CCT Tuning Smart Lighting Manager device is part of the ams AS722x/1x Smart Lighting
Manager/Director family of products that simplify tunable and environmentally responsive lighting
designs, enable lights to be “aware” and adapt to their surroundings, and to autonomously serve
human-centered lighting and energy conservation needs. The device is equipped with an advanced
Cognitive Lighting Engine (CLE) to optimize, chromatic white tuning, daylight harvesting and lumen
maintenance via a combination of PWM and/or 0-10 V controls with dimming ballasts. Direct
connection to a local I/O network enables connectivity with standard occupancy sensors, dimmers or
communications bridges.
The AS7221 is designed for use directly in tunable white luminaires, replacement lamps (bulbs) and
light-engines/modules, or with a simple lightguide implementation, it can be incorporated directly into
an LED driver to enable a highly cost-competitive, high-accuracy warm/cool CCT tuning solution.
AS7221 XYZ chromatic white sensing provides mapping to x, y (z) of the CIE 1931 2-dimensional
color gamut coordinates and scales the coordinates to the CIE 1976 u’v’ coordinate system. The
AS72211’s silicon via nano-optic deposited interference filters deliver high-stability over both time and
temperature. The Manager’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.
The AS7221 connects to standard 0-10 V dimmers inputs and drives 0-10 V dimming ballasts/drivers
to enable a highly cost-effective white tunable current-steering luminaire design with a single-channel
constant current ballast. Direct PWM inputs can also interface to standard PWM-dimmable LED
drivers or multi-channel ballasts for constant voltage LED lighting architectures.
An UART interface is provided for configuration, control and management via a driverless, high-level
text base Smart Lighting Command Set.
1.1 Key Benefits & Features
The benefits and features of AS7221, CCT Tuning Smart Lighting Manager, are listed below:
Figure 1:
Added Value of Using the AS7221
Benefits
Features
Lowers overall manufactured costs and adds
precision to tunable white luminaires and lamps
Intelligent controller with integrated, calibrated
XYZ Tristimulus Sensor (CIE 1931 Standard
Observer Color Function)
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AS7221
General Description
55 │ 4
Benefits
Features
Enables cost-optimized single channel drivers to
deliver a precise tunable white result.
Selectable drive modes, including PWM-
switched current steering, 0-10 V or PWM
dimming or PWM-based duty cycle management
Supports legacy IO approaches, as well as
digital deep dimming
Built-in 0-10 V analog or PWM digital dimming
output generator for precise 1% dimming
Direct serial interface for connection to standard
networks
UART interface for connection to network
hardware clients for protocols such as Bluetooth,
ZigBee and WiFi
Simple lamp or luminaire configuration and
commissioning using defined command set
Smart Lighting Command Set (SLCS) uses
simple text-based commands to control and
configure a wide variety of functions
Compact lighting-capable package with no
added optics required
20-pin LGA package 4.5mm x 4.7mm x 2.5mm
with integrated aperture -40 °C to 85 °C
1.2 Applications
● Commercial, retail, and residential CCT tunable LED lighting systems
● Cost-optimized tunable white LED drivers
● Higher precision replacement lamps/bulbs
● Intelligent, networked solid-state lighting management for variable CCT and daylight harvesting
● Integrated smart lighting control of variable CCT white lighting solutions
● Luminaires intended to meet California Title 24 daylighting requirements
● Networked lighting systems with IoT sensor expandability
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AS7221
General Description
55 │ 5
1.3 Block Diagram
The AS7221 provides closed loop chromatic white sensing and PWM tuning while interfacing to local
and network controls.
The functional blocks of this device are shown below.
Figure 2 :
Functional Blocks of AS7221
SPI
Master
PWM
Generator
Dimming &
Auxiliary
Mode
I²C Master
UART
Cognitive Light
Engine (CLE)
OSC
16 MHz
DAC
DIM
AUX
SDA_M
SCL_M
RX
TX
GND
PWM_1/
0_10V_O
PWM_2
PWM_3
SYNC/
RESN
MODE LED_IND
MISO
MOSI
CSN
VDD VDDHV
Optional Inputs
Network Access
Setup
Outputs
°C
SCK
X Y Z
Chromatic White
XYZ Sensor
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AS7221
Ordering Information
55 │ 6
2 Ordering Information
Ordering
Code
Description
Package
Marking
Delivery
Form
Delivery
Quantity
AS7221 –
BLGT
CCT Tuning Smart
Lighting Manager –
Standard Reel
20-Pin LGA
AS7221
13-inch Tape
& Reel
2000 pcs/reel
AS7221 –
BLGM
CCT Tuning Smart
Lighting Manager –
Mini Reel
20-Pin LGA
AS7221
7-inch Mini
Tape & Reel
500 pcs/reel
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AS7221
Pin Assignment
55 │ 7
3 Pin Assignment
3.1 Pin Diagram
Figure 3:
Pin Diagram for AS7221 (Top View)
AS7221
Top View
1
2
3
4
5
15
14
13
12
11
20 19 18 17 16
6 7 8 9 10
PWM_3
SYNC/
RESN
SCK
MOSI
MISO
MODE
VDDHV
DIM
TX
RX
PWM_2
PWM_1
0_10V_O
LED_IND
VDD
GND
CSN
NC
AUX
SCL_M
SDA_M
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AS7221
Pin Assignment
55 │ 8
3.2 Pin Description
Figure 4:
Pin Description of AS7221 (20-Pin LGA)
Pin Number
Pin Name
Pin Type(1)
Description
1
PWM_3
AO
Digital PWM 3
2
SYNC/RESN
DI
Active low (with internal pull-up to VDD)
3
SCK
DI
SPI serial clock
4
MOSI
DO
SPI MOSI
5
MISO
DI
SPI MISO
6
CSN
DO
Chip select for the required external serial flash
memory, active low
7
NC
-
Not connected
8
AUX
AI
Auxiliary mode input pin
9
SCL_M
DI/O
I²C master clock pin
10
SDA_M
DI/O
I²C master data pin
11
RX
DI
UART RX pin
12
TX
DO
UART TX pin
13
DIM
AI
0-2 V or 0-10 V input dimming pin
14
VDDHV
P
High voltage supply
15
MODE
AI
Mode selection pin
16
GND
P
Ground
17
VDD
P
Low voltage supply
18
LED_IND
AO
LED Driver output for Indicator LED, current
sink
19
PWM_1
AO
Digital PWM 1
0_10V_O
AO
0-10 V output pin
20
PWM_2
AO
Digital PWM 2
(1) Explanation of abbreviations:
DI Digital Input
DO Digital Output
DI/O Digital In Out
AO Analog Out
AI Analog In
P Power Pin
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AS7221
Absolute Maximum Ratings
55 │ 9
4 Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only. Functional operation of the device at these or any other
conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability. The device is not
designed for high-energy UV (ultraviolet) environments, including upward looking outdoor applications,
which could affect long-term optical performance. All voltages with respect to GND. Device
parameters are guaranteed at VDD = 3.3 V and TAMB = 25 °C unless otherwise noted.
Figure 5
Absolute Maximum Ratings of AS7221
Symbol
Parameter
Min
Typ
Max
Unit
Comments
Electrical Parameters
VDD_MAX
Supply Voltage VDD
-0.3
5
V
Pin VDD to GND,
Low Voltage pin
VDDHV_MAX
Supply Voltage VDDHV
-0.3
20
V
Pin VDDHV to GND,
High Voltage pin
VDD_IO
Input/Output Pin Voltage
-0.3
VDD +
0.3
V
Low Voltage pins to GND
VDDHV_IO
Input/Output Pin Voltage
-0.3
VDDHV
+ 0.3
V
High Voltage pins to GND
ISCR
Input Current
(latch-up immunity)
± 100
mA
JESD78D
Electrostatic Discharge
ESDHBM
Electrostatic Discharge
HBM
±1000
V
JS-001-2014
ESDCDM
Electrostatic Discharge
CDM
±500
V
JEDEC JESD22-C101F Oct 2013
Temperature Ranges and Storage Conditions
TSTRG
Storage Temperature
-40
85
°C
TBODY
Package Body
Temperature
260
°C
IPC/JEDEC J-STD-020 (1)
RHNC
Relative Humidity (non-
condensing)
5
85
%
MSL
Moisture Sensitivity Level
3
Represents a 168 hour max. floor
lifetime
Bump Temperature (soldering)
TPEAK (1)
Peak Temperature
235
245
°C
Solder Profile
(1) The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification for no hermetic Solid State Surface Mount Devices.” The lead finish for
Pb-free leaded packages is “Matte Tin” (100 % Sn)
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AS7221
Electrical Characteristics
55 │ 10
5 Electrical Characteristics
All limits are guaranteed with VDD = 3.3 V, VDDHV = 12 V, TAMB = 25 °C. The parameters with min
and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. If
VDD and VDDHV are to be the same voltage, they must be sourced by the same 2.97 V to 3.6 V
supply. All voltages with respect to GND.
Figure 6:
Electrical Characteristics of AS7221
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
General Operating Conditions
VDD
Low Voltage
Operating Supply
2.97
3.3
3.6
V
VDDHV
High Voltage
Operating Supply
VDD
12
15
V
TAMB
Operating
Temperature
-40
25
85
°C
IVDD
Operating Current
Excluding LED
driver current
5
mA
Internal RC Oscillator
FOSC
Internal RC
Oscillator
Frequency
15.7
16
16.3
MHz
tJITTER(1)
Jitter
@25 °C
1.2
ns
0-10 V Output (0_10V_O pin)
ROUT_10
Resistive Load
1
kΩ
IS_10
Source Current
10
mA
ISINK_10
Sink Current
-10
mA
ILEAK_HV
HV Output Leakage
Current
VIN=12 V, DAC &
PWM1 both
disabled
-1.6
-0.73
mA
CLOAD_10
Capacitive Load
100
pF
VOUT_10(2)
Output Swing
0
10
V
AUX Input
AUXIN
AUX Input Voltage
For 100% AUX A/D
conversion
3.0
V
RIN_AUX
Analog Input
Resistance
168
240
312
kΩ
0-10 V Input
RIN_HV
Analog Input
Resistance
VDDHV ≥ 12 V
138
200
315
kΩ
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AS7221
Electrical Characteristics
55 │ 11
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Temperature Sensor
DTEMP
Absolute Accuracy
of the Internal
Temperature
Measurement
-8.5
8.5
°C
Indicator LED
IIND
LED Current
1
8
mA
IACC
Accuracy of Current
-30
30
%
VLED
Voltage Range of
Connected LED
VDS of current sink
0.3
VDD
V
Digital Inputs and Outputs
IIH, IIL
Logic Input Current
Vin=0 V or VDD
-1
1
µA
IIL SYNC/RESN
Logic Input Current
(SYNC/RESN pin)
Vin=0 V
-1
-0.2
mA
VIH
CMOS Logic High
Input
0.7 × VDD
VDD
V
VIL
CMOS Logic Low
Input
0
0.3 × VDD
V
VOH
CMOS Logic High
Output
I=1 mA
VDD - 0.4
V
VOL
CMOS Logic Low
Output
I=1 mA
0.4
V
tRISE(1)
Current Rise Time
C(Pad)=30 pF
5
ns
tFALL(1)
Current Fall Time
C(Pad)=30 pF
5
ns
(1) Guaranteed, not production tested
(2) For VDDHV>10.5, output max is 10 V, else output max tracks VDDHV
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AS7221
Optical Characteristics
55 │ 12
6 Optical Characteristics
The XYZ chromatic white/color sensor, part of the AS7221 Cognitive Light Engine (CLE), is a next-
generation digital color sensor device. The sensor contains an integrating analog-to-digital converter
with 16-bit resolution ADC, which integrates current from photodiodes. Upon completion of the
conversion cycle, the result is transferred to the corresponding data registers to drive internal tuning
algorithms. Transfers are double-buffered to ensure integrity of the data is maintained.
Standard observer tri- stimulus (XYZ) interference filters are applied to the SLM’s optical channels as
part of the CMOS process. This unique process enables filter responses that mimic the human eye
and is extremely stable over both operating temperature and time. This in turn allows lifetime
correlated color temperature (CCT) calibration to be performed as part of the manufacturing process.
Calibration is accomplished using standard white LEDs at a variety of CCTs to deliver high accuracy
and typically eliminate the need for light-by-light calibration in most designs. Note that any change of
the precalibrated measurement conditions have an impact on the accuracy of the measurement
results. In such cases a design-level diffuser or color brightness calibration is recommended to
achieve highest accuracies. The AS7221 provides 2 calibration matrices, a factory calibration and a
second application specific matrix to optimize the measurement performance. The additional
calibration values will be set using the Smart Lighting Command Set directives ATNORMGAIN and
ATNORMINTT. These settings will be saved in the external flash and reloaded automatically by the
sensor firmware. See Section 10 for description of the complete Smart Lighting Command Set.
The AS7221 LGA package contains an internal aperture that provides a package field of view (PFOV)
of ± 20.5°. External optics can be used as needed to expand or reduce this built in PFOV.
Sensor data readout to the maximum count value range is limited by the ADC. The maximum count
range value of 65535 is only reached with an integration time tINT of approximately 177.92 ms. Below
that value, the FSR will be less than the maximum 16-bit/65536 count maximum as described in the
chart below.
Figure 7:
Overview Signal Resolution
Bit Resolution
tINT in ms
Maximum Counts
10
2.78
1024
11
5.56
2048
12
11.12
4096
13
22.24
8192
14
44.48
16384
15
88.96
32768
16
177.92
65536
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AS7221
Optical Characteristics
55 │ 13
Figure 8:
AS7221 Optical Characteristics
Symbol
Parameter
Conditions
Min
Typ(1)
Max
Unit
Color_m(2)
Color Measurement
Accuracy
White Light
CCT=2700 K,
3500 K, 4500 K and
5700K
0.002
du’v’
Z_count
Z Channel Count
Accuracy
White light CCT =
5700 K
3.375
4.5
5.625
counts/
(W/cm2)
(1) Typical values at Lux ≥50, Integration time=400.4 ms, Gain=1x, TAMB = 25 ºC.
(2) Calibration and measurements were made at diffused light.
Figure 9:
Normalized Spectral Responsivity (all filters are normalized to 1)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
350 400 450 500 550 600 650 700 750 800 850 900 950 1000 1050 1100
TYPICAL SENSOR RESPONSIVITY (NORMALIZED TO "1")
WAVELENGTH (NM)
SENSOR FUNCTI ON BA S ED ON CI E 1931 2 ° CMF
X
Y
Z
NIR
C
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AS7221
Optical Characteristics
55 │ 14
Figure 10:
AS7221 LGA Average Field of View
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AS7221
Functional Description
55 │ 15
7 Functional Description
7.1 Smart Lighting Manager – Overview
The Cognitive Light Engine (CLE) is the “brains” of the Smart Lighting Manager (SLM). The CLE
constantly processes information from the calibrated XYZ chromatic white/color sensor, Smart Lighting
Command Interface and control inputs to adjust and control PWM and 0-10 V channel outputs to
deliver the targeted light characteristics. AS7221 initial setup and ongoing parameter storage is
automatically done by software within the required external serial Flash memory, via SPI bus. Only
ams-verified models of Flash devices can be supported. A subset of supported devices is noted in the
UART Command Interface section of this document, which also provides a reference to the current list
of supported Flash memory devices. For the Flash memory overview please refer to Figure 30. A SPI
Flash device is a required operating companion to the AS7221. Figure 30 includes a partial list of
supported devices, which have been tested by ams. Using non-verified devices can cause
communication issues and may not be compatible. Flash timing is provided in Figure 28 and Figure 29
for debug purposes.
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 AS7221 can support high precision multi-channel
tuning results from a lower cost dual- or single channel LED driver architecture. 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.
To support the growing need for more personalized or circadian-rhythm supportive lighting systems,
up to 16 scenes can be preset into flash memory to support autonomous CCT and brightness
adjustments, including programmable ramp/transition timing. Scene timing, targets and ramps are
programmable via the high-level Smart Lighting Command Set described in Section 10.
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AS7221
Functional Description
55 │ 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
manufacturer 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
LED String 1 warm white
LED String 2 cold white
Flash
optional
Daylight Sensor
Ambient LUX
Measurement
(outwards
looking sensor)
CCT and/or LUX Measurement
(inwards looking)
Ambient Light
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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AS7221
Functional Description
55 │ 17
For daylight operation, the AS7221 can be used two ways. As a standalone device pointing out of the
luminaire, or if pointing inward for white color, it can support daylighting operation by using an I2C
master connected to ams TSL25721 or TSL45315 for ambient light sensing.
Figure 12:
Solution Chart
Chromatic Color Maintenance
Lumen Maintenance
Chromatic Color
Maintenance
Lumen Maintenance
Daylighting
AS7221
TSL25721 or
TSL45315
(optional)
✔
✔
✖
(into luminaire)
✖
(not required)
✔
✖
✔
(into luminaire)

(into room)
TSL25721 device combines a channel 0 (CH0) which is responsive to both visible and infrared light,
and channel 1 (CH1) which is responsive primarily to infrared light. Therefore, to get the LUX, a
calibration is necessary. In this calibration, both channels has to be considered. First counts per lux
(CPL) needs to be calculated in this calibration method.
Counts per LUX (CPL):
𝐶𝑃𝐿 = 𝐶𝐻0 − (1.87 ∗𝐶𝐻1)
𝐿𝑈𝑋
Calibration Scalar:
𝐿𝑈𝑋 = 𝐾0 ∗ 𝐴𝐷𝐶0 − 𝐾1 ∗ 𝐴𝐷𝐶1
Default setting K0 is 0.2178 (normal sunlight conditions in Europe in May, 1 m distance to a window).
If K0=0, the result for K1 will be inverted to prevent negative LUX values. At different light conditions,
this value has to adjust.
Example:
Spectrometer value = 9764 Lux,
CH0 = 22870,
CH1 = 2734
→ CPL = 1.8186
K0 = 1/CPL = 0.549855,
K1 = 1.87/CPL = 1.028228
To save the values, write in the console tab, ATLXSL0=0.549855 and ATLXSL1= 1.028228
Overall AS7221 timing generation uses an on chip 16 MHz temperature compensated oscillator for
master clock timing.
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AS7221
Functional Description
55 │ 18
7.2 XYZ Chromatic White Color Sensor
The XYZ chromatic sensor, part of the AS7221 Cognitive Light Engine (CLE), is a next-generation
digital color sensor device. The sensor contains an integrating analog-to-digital converter (16-bit
resolution ADC), which integrates current from photodiodes. Upon completion of the conversion cycle,
the result is transferred to the corresponding data registers. Transfers are double-buffered to ensure
integrity of the data is maintained.
Standard observer tri-stimulus (XYZ) interference filters are applied to the SLM’s optical channels as
part of the CMOS process. This unique process enables filter responses that mimic the human eye
and are extremely stable over both operating temperature and time. This in turn allows lifetime
correlated color temperature (CCT) calibration to be performed as part of the manufacturing process.
Calibration is accomplished using standard white LEDs at a variety of CCTs to deliver high accuracy;
eliminating the need for light-by-light calibration in most designs. The Smart Lighting Command Set
(SLCS) also includes provisions for application level calibration to provide a mechanism for additional
design-specific calibration and compensation. Note the AS7221 LGA package contains an internal
aperture that provides a package field of view (PFOV) of ± 20.5°. External optics can be used as
needed to expand or reduce this built in PFOV. Scalar commands supported in the SLCS enable a
level of compensation for added optics.
7.3 Inputs
Figure 13:
VDDHV Based Settings for Inputs
VDDHV
Dimming
10.5-15 V
Direct input for DIM, dimming input
2.97-10 V (1)
External 5:1 resistor divider for DIM, dimming input (2)
(1) For VDDHV ≤ 3.6 V, VDDHV and VDD should be tied together.
(2) With external dividers connected to 0-10 V inputs, the max voltage to the device input is 2 V.
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AS7221
Functional Description
55 │ 19
Figure 14:
0-10 V Dimming Pin Input
For the AS7221, dimming can be accomplished from either the input pin (DIM) or smart lighting
command via the UART. For network commanded dimming, using the AS7221 Smart Lighting
Command Set, the UART interface is used. To prevent flicker effects the low end of the dimming
range can be adjusted via the ATDMLTL command to the provided range of the external dimming
device.
Local hardware inputs can be provided by, for example, a slide control dimmer. The 0-10 V DIM
analog input signal is downscaled by the AS7221 with an internal voltage divider and converted to a
10-bit digital value, 0 V=full dimming, 10 V=no dimming. When using the internal voltage divider the
voltage at the VDDHV pin has to be higher than 10 V.
If a second supply voltage is not available, VDDHV and VDD are tied together and the downscale has
to be done by an external resistor divider. The maximum range in the downscaled input is limited to
2 V. Hence, to accept a full range 10 V signal the input resistor divider has to be 5:1 ratio. Dependent
on the level at pin VDDHV the Smart Lighting Manager automatically selects either the internal or the
external voltage divider. Refer to Figure 14 and Figure 15.
If the DIM pin is not used, an external resister pull-up connecting it to VDDHV is recommended. For a
complete description of the Smart Lighting Command Set refer to Section 10 Figure 32.
Figure 15:
AUX Pin Input
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AS7221
Functional Description
55 │ 20
The AUX input is a multifunction pin that is configured via SLCS commands into one of several
modes. It can be used as a secondary input to allow additional control, in addition to the 0-10 V slider
dimming function of the DIM pin. In AUX mode, the sensed AUX voltage is scaled and used to multiply
the dimming scale. The auxiliary sensor input (AUX) has a 0-3 V range for its default analog sensing
mode. With this 0-3 V range, external ranges such as 0-10 V can be accommodated using external
resister divider networks such as a 10:3 network for a 0-10 V occupancy sensor. The AUX pin can
also be configured for digital sensing (0,1 where 1=VDD).
In the OCC mode an occupancy event from an external digital occupancy sensing device will trigger a
timer restart, enabling the occupancy sensing function. An occupancy event enables the PWM output
and resets the OCC timer. If the OCC signal falls below a detecting threshold (50%), the OCC timer
restarts a countdown. The OCC timer counting time is set by the ATOCCT command. A value up to 10
minutes can be stored. After finishing the countdown without an occupancy event re-occurring, the
PWM output is dimmed to 0 output (lights off).
In CCT_Tune mode, the analog pin input will be interpreted to linearly tune between min and max
CCT values that are set via smart lighting commands. In this mode, all lights on a single CCT-tuning
circuit will see the same CCT_Tune input value for light-to-light CCT consistency.
In CCT_SEL mode, a preselected CCT target value can be set via the provided voltage at the AUX
pin. The selected CCT target values will be configured in 300 mV step width.
Figure 16:
CCT_SEL Targets
CCT (K)
Vmin (mV)
Vnorm (mV)
Vmax (mV)
Default configured target value
0
150
300
2700
300
450
600
3000
600
750
900
3500
900
1050
1200
4000
1200
1350
1500
4100
1500
1650
1800
5000
1800
1950
2100
5700
2100
2250
2400
6500
2400
2550
2700
CT off
2700
2850
3000
If the AUX pin is not used, an external resistor pull-up connecting it to VDD is recommended.
7.4 Synchronization and Reset
AS7221 provides optional synchronization of the PWMs. This sync signal can be derived from the AC
mains to enable all luminaires in a room to be synchronized to prevent beat frequency flicker. If the
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AS7221
Functional Description
55 │ 21
SYNC pin is left open, synchronization is automatically disabled by the internal pull-up connected to
the SYNC/RESN pin.
Refer to Figure 17 below. When pulled down for more than 100 ms the SYNC/RESN pin will reset the
AS7221 Smart Lighting Manager. In this case, the push button “overrides” the output of the opto-
coupler. Therefore, a resistor should be placed in series with the opto-coupler.
Figure 17:
Synchronization and Reset
7.5 PWM Outputs
The AS7221 outputs, used to control dimming and LED warm/cool strings can be configured as either
three PWM outputs, two PWMs and one analog output, or two PWMs. The PWMs are 7-bit for direct
configuration, 12-bit for automatic scaling (daylight and color tune algorithm) and factory set to 886 Hz.
Refer to Figure 18. If necessary, an adjustment of the PWM output frequency from 100 Hz up to 4 kHz
is possible.
The three PWM outputs, PWM_1, PWM_2 and PWM_3 all switch with the same frequency, but are
not simultaneous for better EMI performance.
The PWM_1 output can be set to either analog (0-VDDHV) or digital (0-VDDHV) dimming. Analog
dimming range is 0-100%. Digital Dimming range is 0-100%. PWM2 and PWM3 are used for cool
white and warm white LED color controlling. The cool white LED string needs to be connected to
PWM2 and the warm white LED string to PWM3 accordingly. Range is 0-100% for both PWM2 and
PWM3. If the external dimming device does not support the full range 0-100% it is possible to adjust
the low end of the dimming range via the ATDMLTL smart lighting command.
For test and scene configuration purposes 2 direct PWM AT-commands are available. ATXPWMx can
be used for scene confiruations. It allows a direct PWM input at the scene ramp generator and
override all PWM values calculated by the AS7221. ATPWMx can be used for hardware tests. It
Opto Coupler
VDD AC Main
CLE
SYNC/
RESN 10k
optional
SYNC and Reset Push > 100ms
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AS7221
Functional Description
55 │ 22
allows a direct PWM input at the end of the sensor line and override all PWM values calculated by the
AS7221 and all ATXPWMx values as well.
To set the desired device operation MODE use the appropriate RMODE resistor, also shown in
Figure 18.
Figure 18:
Outputs
MODE
RMODE
Setting
Outputs
PWM_1/0_10V_O
PWM_2 and PWM_3
0
100 Ω
0-10 V analog
Analog 0-VDDHV (1)
Digital PWMs (0-VDD)
1
470 Ω
0-10 V digital
Digital PWM (VDDHV)(2)
Digital PWMs (0-VDD)
2
1000 Ω
Digital 2-CH color
tuning
Analog 0-VDDHV, not used
for dimming
Digital PWMs (0-VDD),
w/Dimming
(1) For VDDHV>10.5 V, output max is 10 V, else output max tracks VDDHV.
(2) Digital PWM output is following VDDHV and it not limited to 10 V in digital PWM mode.
7.6 Indicator LED
An LED, connected to pin LED_IND, is used to indicate boot and programming progress of the device.
If an error occurs with the memory access the indicator LED starts blinking operation. When
programming is finished and programming tool disconnected the indicator LED turns on (default
setting).
The LED_IND pin is set for 1 mA operation by the AS7221 factory firmware. This is not under user
control. The indicator LED can be enabled or disabled by using the ATLED0 command. Consideration
should be taken with respect to any final product design to avoid light intrusion from the indicator LED
into the direct or reflected field of view of the sensor.
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AS7221
I²C Master Interface
55 │ 23
8 I²C Master Interface
External sensors with native support by the AS7221 can be added via the I²C master interface. For
example the ams current TSL25721 or legacy TSL45315 can be used to add daylighting operation to
the AS7221. Once the supported ambient light sensor is detected by the AS7221, and the daylighting
is activated by using the ATDL=1 command, daylighting operation begins. Native support is provided
for selected ams environmental sensors including temperature, humidity and air quality/VOC.
The I2C Master interface uses I2C serial protocol for communication with 7+1-bit chip addressing mode
and full-speed clock frequency. Read and Write transactions comply with the standard set by Philips
(now NXP).The I2C master interface can be used as a UART to I2C Bridge to connect to other I2C
external sensors that do not have native support in the smart lighting firmware. Supporting smart
lighting commands enable pass-through communications with non-natively supported devices.
8.1 I²C Protocol
Figure 19:
I2C Symbol Definition
Symbol
Definition
RW
Note
S
Start condition after stop
R
1-bit
Sr
Repeated start
R
1-bit
SW
Slave address for write
R
Slave address
SR
Slave address for read
R
Slave address
WA
Word address
R
8-bit
A
Acknowledge
W
1-bit
N
No acknowledge
R
1-bit
Data
Data/write
R
8-bit
Data (n)
Data/read
W
8-bit
P
Stop condition
R
1-bit
WA++
Slave increment word address
R
During acknowledge
The above I²C symbol definition table describes the symbols used in the following Read and Write
descriptions.
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I²C Master Interface
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8.2 I²C Write Access
Byte Write and Page Write formats are used to write data to the slave.
Figure 20:
I2C Byte Write
Figure 21:
I2C Page Write
The transmission begins with the START condition, which is generated by the master when the bus is
in IDLE state (the bus is free). The device-write address is followed by the word address. After the
word address any number of data bytes can be sent to the slave. The word address is incremented
internally, in order to write subsequent data bytes on subsequent address locations.
For reading data from the slave device, the master has to change the transfer direction. This can be
done either with a repeated START condition followed by the device-read address, or simply with a
new transmission START followed by the device-read address, when the bus is in IDLE state. The
device-read address is always followed by the 1st register byte transmitted from the slave. In Read
mode any number of subsequent register bytes can be read from the slave. The word address is
incremented internally.
8.3 I²C Read Access
Random, Sequential and Current Address Read are used to read data from the slave.
Figure 22:
I2C Random Read
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AS7221
I²C Master Interface
55 │ 25
Random Read and Sequential Read are combined formats. The repeated START condition is used to
change the direction after the data transfer from the master.
The word address transfer is initiated with a START condition issued by the master while the bus is
idle. The START condition is followed by the device-write address and the word address.
In order to change the data direction a repeated START condition is issued on the 1st SCL pulse after
the acknowledge bit of the word address transfer. After the reception of the device-read address, the
slave becomes the transmitter. In this state the slave transmits register data located by the previous
received word address vector. The master responds to the data byte with a not-acknowledge, and
issues a STOP condition on the bus.
Figure 23:
I2C Sequential Read(1)
(1) Shows the format of an I²C sequential read access.
Sequential Read is the extended form of Random Read, as more than one register-data bytes are
transferred subsequently. In difference to the Random Read, for a sequential read the transferred
register-data bytes are responded by an acknowledgement from the master. The number of data bytes
transferred in one sequence is unlimited (consider the behavior of the word-address counter). To
terminate the transmission the master has to send a not-acknowledge following the last data byte and
generate the STOP condition subsequently.
The AS7221 is compatible to the NXP two wire specifications.
http://www.nxp.com/documents/user_manual/UM10204.pdf Version 4.0 Feb 2012 for standard mode
and fast mode
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AS7221
I²C Master Interface
55 │ 26
8.4 Timing Characteristics
Figure 24 :
AS7221 I²C Master Timing Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSCL
SCL Clock Frequency
400
400
kHz
tBUF
Bus Free Time Between a
STOP and START
1.3
µs
tHD:STA
Hold Time (Repeated)
START
0.6
µs
tLOW
LOW Period of SCL Clock
1.3
µs
tHIGH
HIGH Period of SCL Clock
0.6
µs
tSU:STA
Setup Time for a Repeated
START
0.6
µs
tHD:DAT
Data Hold Time
0
0.9
µs
tSU:DAT
Data Setup Time
100
ns
tR
Rise Time of Both SDA and
SCL
20
300
ns
tF
Fall Time of Both SDA and
SCL
20
300
ns
tSU:STO
Setup Time for STOP
Condition
0.6
µs
CB
Capacitive Load for Each
Bus Line
CB — total
capacitance of one
bus line in pF
400
pF
CI/O
I/O Capacitance (SDA,
SCL)
10
pF
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AS7221
I²C Master Interface
55 │ 27
8.5 Timing Diagrams
Figure 25:
I²C Master Timing Diagram
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AS7221
UART Command Interface
55 │ 28
9 UART Command Interface
The UART block implements the TX and RX signals as defined in the RS-232 / V.24 standard
communication protocol. A SPI Flash is a required operating companion device for the AS7221 to
function or to communicate via the UART interface. Using non-verified flash devices can cause
communication issues and may not be compatible. See Figure 30 for a subset of supported devices,
which are tested by ams. The “xx” in the serial flash name stands for alternative packages and a
reference is provided to the current list of verified flash devices. Flash timing is provided in Figure 25
for debug purposes.
9.1.1 UART Feature List
● Full Duplex Operation (Independent Serial Receive and Transmit Registers)
● Factory set to 115.2 kBaud
● Supports Serial Frames with 8 Data Bits, no Parity and 1 Stop Bit.
9.1.2 Operation
Transmission
If data is available, it will be moved into the output shift register and the data will be transmitted at the
Baud Rate, starting with a Start Bit (logic zero) and followed by a Stop Bit (logic one).
Reception
At any time, with the receiver being idle, if a falling edge of a Start Bit is detected on the input, a byte
will be received. The following Stop Bit will be checked to be logic one.
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AS7221
UART Command Interface
55 │ 29
9.2 UART Protocol
Figure 26:
UART Protocol
9.3 SPI Timing Characteristics
The AS7221 contains a serial UART interface to connect to a Flash memory. An Overview can be
found in Figure 30. The required timing characteristics for a serial interface is shown in Figure 28 and
in Figure 29 accordingly. If a Flash memory is used for debug purposes which is not listed in Figure 30
it should be ensured that the SPI timing is achieved. Contact ams for requests to support/verify
additional Flash devices beyond those listed in the most current device verification listing.
Figure 27:
AS7221 SPI Timing Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSCK
Clock Frequency
0
16
MHz
tSCK_H
Clock High Time
40
ns
tSCK_L
Clock Low Time
40
ns
tSCK_RISE
SCK Rise Time
5
ns
tSCK_FALL
SCK Fall Time
5
ns
TCSN_S
CSN Setup Time
Time between CSN high-low transition
to first SCK high transition
5
ns
tCSN_H
CSN Hold Time
Time between last SCK falling edge
and CSN low-high transition
5
ns
tCSN_DIS
CSN Disable Time
10
ns
tDO_S
Data-Out Setup Time
5
ns
After Tbit/2: Sampling of Start Bit
Start Bit Stop Bit
Data Bits
Start Next Start
Start Bit detected
Tbit=1/Baud Rate
Always Low Always High
After Tbit: Sampling of Data
Sample Points
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UART Command Interface
55 │ 30
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
tDO_H
Data-Out Hold Time
5
ns
tDI_V
Data-In Valid
10
ns
9.4 SPI Timing Diagrams
Figure 28:
SPI Master Write Timing Diagram
Figure 29:
SPI Master Read Timing Diagram
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AS7221
UART Command Interface
55 │ 31
9.5 Serial Flash
A SPI Flash device is a required operating companion to the AS7221. See Figure 30 for supported
devices, which are tested by ams. Using other devices can cause communication issues and may not
be compatible Flash timing is provided in Figure 25 for debug purposes.
Figure 30:
Flash Memory Overview
Serial Flash
Manufacturer
AT25SF041xx
Adesto Technologies
AT25DF041xx
Adesto Technologies
MX25L4006ExxI-12G
Macronix
SST25PF040C
Microchip Technology
W25X40CLSNIG
Winbond Electronics
LE25U40CMD
ON Semiconductor
GD25Q40C
GigaDevice
FS25Q004F1
Foresee
Additional devices may have been added to this list after publication of this datasheet. See “AS72xx
External Flash program and update” application note available on the ams AS7221 product document
section of the ams website.
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AS7221
Smart Lighting Command Interface
55 │ 32
10 Smart Lighting Command Interface
The Smart Lighting Manager supports a high-level, driverless text control interface using its Smart
Lighting Command Set (SLCS) communicated through the UART interface. The SLCS provides a rich
configuration and control interface to speed the time-to-design and time-to-market for luminaire,
replacement lamp and driver manufacturers. The Smart Lighting Manager uses a variation of an “AT
command model” as popularized by early Hayes modems. The SLCS is integrated into the required
binary operating image that is included on the USB memory stick provided with an AS722x/1x Smart
Lighting Demo Kit. Updates or the latest version of the SLCS can be downloaded via
https://download.ams.com. Login is required and a login can be obtained through the email address
provided on the download site.
A configuration tool is available from ams to allow the luminaire, lamp or driver manufacturer 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 also available from
https://download.ams.com.
Write commands are constructed in the format “ATcmd=xxx” with the SLM returning the requested
data value followed by the “OK” text reply. Commands that are unsuccessfully interpreted or are
otherwise invalid will return an “ERROR” text reply.
For example:
● Set the desired daylight LUX level target: ATLUXT=500 <OK>
● Read current lux target set point: ATLUXT <500 OK>
● Read current calibrated lux level as observed by the sensor: ATLUXC <497 OK>
The “Smart Lighting Command Interface”, shown below between the network interface and the core of
the system, provides access to the Smart Lighting Manager’s lighting control and configuration
functions.
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AS7221
Smart Lighting Command Interface
55 │ 33
Figure 31:
Smart Lighting Command Interface
10.1 AT Commands
The command interface to control the AS7221 is via the UART, using AT commands across the UART
interface. The AT command interface block diagram, shown in Figure 31 between the network
interface and the core of the system, provides access to the AS7221’s Cognitive Light Engine’s control
and configuration functions (see also chapter UART ).
In the command description below, numeric values may be specified with no leading prefix, in which
case they will be interpreted as decimals, with leading “0x” to indicate that they are hexadecimal
numbers, or with a leading “b” to indicate, that they are binary numbers. The commands are grouped
into functional areas Texts appearing between angle brackets (‘<’ and ‘>’) are commands or response
argument. A carriage return character, a linefeed character, or both may terminate commands to the
SLM. The SLM command output is a response followed by a linefeed character. Note that any
command that cannot interpreted or which encounters an error will generate “ERROR” response.
Figure 32:
AT Commands
Command
Direction
Description
Format
Value Range
Default
Status and Basic Initialization
AT
R
NOP
-
-
-
ATLIGHT
R/W
Enables/disables the
light (PWM output)
DEZ
1:ON, 0:OFF
1
UART CLE
AS7221
Smart Lighting Command Interface
Network
Bridge
Smart Lighting
Command
BLE
WiFI
ZigBee
BacNet
KNX
etc.
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AS7221
Smart Lighting Command Interface
55 │ 34
Command
Direction
Description
Format
Value Range
Default
ATINTTIME
R/W
Set sensor integration
time. Integration time =
<value> x ~2.8 ms
DEZ
1 – 255
20
ATGAIN
R/W
Set sensor gain: 0=1x
gain, 1=3.7x, 2=16x,
3=64x
DEZ
0 – 3
1
ATLED0
R/W
Enables or disables the
indication led
DEZ
0: LED off / 1: LED on
1
ATLAI
R/W
Read lower light
address identifier
DEZ
0 – 65535
65535
ATLAIE
R/W
Read higher light
address identifier
DEZ
0 – 65535
65535
ATTEMP
R
Read the current
device temperature in
degrees Celsius
DEZ
-
-
ATEVENT
R
Read the 16-bit EVENT
register, clearing the
entire register after the
read
HEX
Bit0: OCC
An occupancy (OCC) event has occurred
since the last register read
Bit1: DIM
An adjustment to the dimming level (DIM)
has occurred since the last register read.
Bit2: LED23M
An adjustment to the color tune level
(LED23M) has occurred since the last
register read.
Bit3: Not used
Bit4: SCENE
A scene has triggered since the last
register read
Bit5: DL_LIMIT
The lumen controller has reached a limit,
target value cannot reached
Bit6: CT_LIMIT
The color temperature controller has
reached a limit, target value cannot
reached
0x0000
ATPERSMEM
R/W
Enable/Disable writing
to persistent memory
DEZ
0: Disabled, 1: Enabled
0
ATSRST
W
Software Reset
-
-
-
ATFRST
W
Factory Reset. Stored
values are reset to
‘Factory’ defaults.
Afterwards a software
reset is started.
-
-
-
Basic CCT Tuning Control and Color Data
ATCT
R/W
Enables/disables color
tuning
DEZ
1: ON, 0: OFF
0
ATCCTT
R/W
Set the color control
target value in integer
(in K)
DEZ
400 – 15000
2700
ATCCTC
R
Return the calibrated
CCT value
DEZ
400 – 15000
-
ATDUVC
R
Read delta uv values
DEZ
XXXX.XXXX
-
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AS7221
Smart Lighting Command Interface
55 │ 35
Command
Direction
Description
Format
Value Range
Default
ATXYZC
R
Read calibrated X, Y,
and Z data
DEZ
<XXX.X, YYY.Y, ZZZ.Z>
-
ATSMALLXYC
R
Read calibrated x and
y for CIE 1931 color
gamut
DEZ
<xxxxx.xxxx, yyyyy.yyyy>
-
ATUVPRIMEC
R
Read calibrated u’, v’
and u, v for CIE 1976
color gamut
DEZ
<u'u'u'u'u'.u'u'u'u',v'v'v'v'v'.v'v'v'v',
uuuuu.uuuu,vvvvv.vvvv>
-
Daylight Harvesting / Illumination Control
ATDL
R/W
Enables/disables
daylight harvesting
DEZ
1: ON, 0: OFF
0
ATLUXT
R/W
Set illumination target
LUX value
DEZ
0 – 64000
400
ATLUXS
R/W
Switch between lux
values from internal
sensor and external
ambient light sensor
DEZ
0: Auto detect (higher priority is external
sensor)
1: Internal sensor
2: External ambient light sensor
0
ATLUXC
R
Read the illumination of
the internal sensor in
lux
DEZ
0 – 64000
65535 – LUX value is in saturation
-
ATDMLTL
R/W
Configures the low-end
DIM output to support
also dimmers without
full range dimming (e.g.
10%-100%)
DEZ
0 – 50
0
DIM Input Pin and Mapping
ATDE
R/W
Enable/disable DIM pin
DEZ
1: ON, 0: OFF
0
ATDMD
R/W
Set DIM pin mode.
Only used if ATDE
enabled!
DEZ
0: DIM mode
Range from 0% to 100%, direct regulation
of the brightness of the PWM outputs
1: LUX mode
Range from 0% to 100%, direct regulation
of the illumination [LUX]. Ranges can be
set via ATDMINLUX and ATDMAXLUX.
Overwrites the ATLUXT command
0
ATDMIN
R/W
ATDMIN sets low end
of DIM pin, using an
integer percentage of
10V. For example
ATDMIN=20 sets the
lower DIM pin range to
2.0 V (10V x 20%) for
0% brightness.
DEZ
0: ATDMAX
0
ATDMAX
R/W
ATDMAX sets high end
of DIM pin, using an
integer percentage of
10 V. For example
ATDMAX=80 sets the
higher DIM pin range to
8.0 V (10V x 80%) for
100% brightness.
DEZ
ATDMIN – 100
100
ATDMINLUX
R/W
Set the current min
LUX target value for
the DIM pin range.
DEZ
0: ATDMAXLUX
0
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AS7221
Smart Lighting Command Interface
55 │ 36
Command
Direction
Description
Format
Value Range
Default
ATDMAXLUX
R/W
Set the current max
LUX target value for
the DIM pin range.
DEZ
ATDMINLUX – 64000
64000
ATPCTLUX
R/W
Set the lux target value
in percentage between
ATDMINLUX and
ATDMAXLUX
DEZ
0 – 100, can read back also 101, which
means that the internal set target value is
out of range
0
ATDVAL
R
Reads the current
analog value of the
DIM pin in digits
DEZ
0 – 1023
-
AUX Input Pin and Mapping
ATXE
R/W
Set AUX input function
enable. When set to 0,
all ATXMD operations
are held in default
mode.
DEZ
1: ON, 0: OFF
0
ATXMD
R/W
Set AUX pin mode.
When ATXE=0, all
ATXMD operations are
disabled.
DEZ
0: AUX mode
This is for AUX pin usage as a 0 – 3 V
input that can scale the DIM pin input.
1: OCC mode
This is for the AUX pin to act as a digital
occupancy input (50% threshold) for the
OCC timer. 1 = Occupancy, 0 = No
occupancy. See also ATOCCT
2: CT_TUNE mode
This is for AUX pin usage as CCT target.
Overwrites the ATCCTT command
3: CT_SEL mode
Selected CCT target values, configured in
300 mV step width
0
ATXMIN
R/W
Sets lower end of 0-3 V
AUX pin, using an
integer percentage of
3 V. For example if
ATXMIN=25 sets an
AUX pin range from
0.75 V (25% x 3v) to
3 V for 0-100% scaling.
DEZ
0: ATXMAX
0
ATXMAX
R/W
Sets higher end of 0-
3 V AUX pin, using an
integer percentage of
3 V. For example if
ATXMAX=75 sets an
AUX pin range to
2.25 V (25% x 3v) to
3 V for 0-100% scaling.
DEZ
ATXMIN – 100
100
ATXMINCCT
R/W
Sets min CCT for
minimum AUX value in
K in AUX CCT_TUNE
mode
DEZ
400 – ATXMAXCCT
400
ATXMAXCCT
R/W
Sets max CCTT for
AUX pin=3 V in K in
AUX CCT_TUNE mode
DEZ
ATXMINCCT – 15000
15000
ATXVAL
R
Reads the current
analog value of the
AUX pin in digits
DEZ
0 – 1023
-
ATOCCT
R/W
Set Occupancy timeout
value for ATXMD = 1
DEZ
1 – 10 [minutes]
10
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AS7221
Smart Lighting Command Interface
55 │ 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
0 – 100
0
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
0
ATLOG
R/W
Set alternate dimming
curve (DALI
approximation)
DEZ
1: Logarithmic
0: Linear
0
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
1 – 100: Ramp time in percent (1s - 10s)
Example:
DIM 50% – 0% with ATRAMP=50 takes
2.5 s
50
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 percent (x = 1 … 3)
DEZ
0 – 100
102 - Release PWM back into loop control
PWM1: 0
PWM2:
50
PWM3:
50
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
0 – 100
102 - Release PWM back into loop control
PWM1: 0
PWM2:
50
PWM3:
50
ATPWMOVR
R
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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AS7221
Smart Lighting Command Interface
55 │ 38
Command
Direction
Description
Format
Value Range
Default
ATLED23M
R/W
Set the value for
PWM2 as a percentage
to drive manual LED
string mixing. PWM3 =
100 - PWM2. The sum
is 100
DEZ
PWM2: 0 – 100
50
Scene Configuration and Management
ATTIMENOW
R/W
Set the current time
with 1 minute
resolution
(update every 30min
recommended for best
scene synchronization)
DEZ
0 – 1439, 65535 - Disabled
65535
ATDOW
R/W
Set day of week
DEZ
0 (Monday) – 6 (Sunday) 255 - Disabled
255
ATCCLR
W
Restores scene
command defaults in
the specified scene.
HEX
One bit for each scene. 1 = Reset
-
ATSnDAY
R/W
Set scene n day(s) of
week for scene
operation, as a decimal
sum
HEX
A 1 in a bit location activates that day.
lsb=1=Monday operation, etc. (e.g. 07
hex=Wed,Tue, Mon) 0x00 - Days not
configured
0x00
ATSnTIME
R/W
Set scene n start time
DEZ
0 – 1439: 1 minute steps from Midnight
65535 - Scene time not configured
0xFFFF
ATSnCCT
R/W
Calls the ATCCTT
command at scene
trigger time
DEZ
See command ATCCT, 65535 – Value not
used
65535
ATSnLUX
R/W
Calls the ATLUXT
command at scene
trigger time
DEZ
See command ATLUXT, 65535 – Value
not used
65535
ATSnDIM
R/W
Calls the ATDIM
command at scene
trigger time
DEZ
0 – 100, 255 – Value not used
255
ATSnLED23M
R/W
Calls the ATLED23M
command at scene
trigger time
DEZ
0 – 100, 255 – Value not used
255
ATSnPWMx
R/W
Calls the ATXPWMx
command at scene
trigger time
DEZ
0 - 100, 255 – Value not used
255
ATSnRAMP
R/W
Sets ramp duration
time in minutes for the
command:
- ATSnPWMx,
ATSnDIM, ATLED23 –
ramp will be handled
by RAMP-generator
- ATSnLUX, ATSnCCT
– ramp is handled by
scene loop (every
second) and can be
stopped by
configuration of new
target values
This command acts
only for the scene
trigger time and not
global like the
ATRAMP command
DEZ
0 – 240
255 – Value not used
255
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AS7221
Smart Lighting Command Interface
55 │ 39
Command
Direction
Description
Format
Value Range
Default
ATSnFLAGS
R/W
This command is used
to enable/disable
configuration flags like
daylight control, color
tuning, dimming,
auxiliary and calls
directly the related
commands: ATDL,
ATCT, ATDE, ATXE
HEX
0x0001 – Enable DL
0x0002 – Enable CT
0x0004 – Enable DIM pin
0x0008 – Enable AUX pin functions
0xFFFF - Value not used
0xFFFF
ATSnON
W
Set scene n to be
on/off.
DEZ
1: ON, 0: OFF
0
ATTSON
R
Read scenes on/off
status.
HEX
Each bit for one scene
0x0000
I2C Configurations and UART-I2C Data Bridge
ATESP
R
Read the single 16-bit
sum to determine
availability of natively
supported I2C devices
HEX
Bit0: ams TSL4531 or TSL2572
Bit1: ams ENS210
Bit2: HTU20D (ESP1 only- obsolete)
Bit3: ams CCS811
-
ATTEMPX
R
Read the external
temperature in degrees
Celsius
DEZ
-40 – 125°C (format: XXX.XX)
-
ATRHX
R
Read the external
humidity in percent
DEZ
0 – 100% (format: XXX.XX)
-
ATECO2
R
Reads the eCO2 [in
ppm] value from the
external gas sensor, if
available
DEZ
400 ppm – 64000 ppm
0 - Means that values will be measured,
but internal calibration is not finished (wait
1min)
-
ATTVOC
R
Reads the TVOC [in
ppb] value from the
external gas sensor, if
available
DEZ
0ppb – 64000ppb
-
ATI2C
W
Perform a single write
to the I2C bus at the
specified 7-bit device
using the 8 bits of
specified data.
Supports also a single
register set (without
value)
-
ATI2C=<7-bit_address>, <8-bit_reg>,
[<8-bit_data>]
- [<8-bit_data>] is optional
Examples:
- ATI2C=50,0x12, 0xFF: Writes value
0xFF to register 0x12 on device address
50
- ATI2C=50,0x12,: Set register 0x12 on
device address 50
-
ATI2C
R
Perform a single read
from the I2C bus at the
specified 7-bit device
address and 8-bit
register, returning
8 bits of data or
ERROR
HEX
ATI2C=<7-bit_address>, <8-bit_reg>
-
Document Feedback
AS7221
Smart Lighting Command Interface
55 │ 40
Command
Direction
Description
Format
Value Range
Default
ATI2CB
W
Starts a burst transfer
up to 10 bytes for
writing and reading. At
first the data will be
written and after then
read sequence will be
started
HEX
ATI2CB=<7-
bit_address>,<read_length>[,<write_data>
] - first two parameter can be hex or dez,
- <write_data> must be hex without
leading 0x, but is optional
examples:
ATI2CB=<7-
bit_address>,<read_length>[,<write_data>
]
- first two parameter can be hex or dez,
- <write_data> must be hex without
leading 0x, but is optional
examples:
ATI2CB=0x49,2: reads two byte from addr
0x49
ATI2CB=50,4,5BF3: writes 0x5B and
0xF3 to address 50 and read 4 bytes after
this
-
Calibration Management
ATDATA
R
Read all six raw
values: X, Y, Z, IR,
dark, clear
DEZ
<X, Y, Z, ir, d, c>
-
ATAMxy
R/W
Write 3x3 application
matrix to flash, x,y =
[0..2]
DEZ
-
1,0,0
0,1,0
0,0,1
ATNORMGAIN
R/W
Set/Get the gain which
the calibration values
were measured
DEZ
0 – 3
1
ATNORMINTT
R/W
Set/Get the integration
time which the
calibration values were
measured
DEZ
1 – 255
59
ATIRXS
R/W
Write IR scalar for
value X
DEZ
-
p2ram
value 0.0
ATIRYS
R/W
Write IR scalar for
value Y
DEZ
-
p2ram
value 0.0
ATIRZS
R/W
Write IR scalar for
value Z
DEZ
-
p2ram
value 0.0
ATPMxy
R/W
Write 3x3 color matrix
to flash, x,y = [0..2]
DEZ
-
p2ram
value
1,0,0
0,1,0
0,0,1
ATLXSL0
R/W
Reads and writes the
calibration scalar K0 for
external ambient light
sensor (TSL2572 only);
Formula:
LUX=K0*ADC0-
K1*ADC1
DEZ
≥0
0.2178
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AS7221
Smart Lighting Command Interface
55 │ 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
0
Firmware and Firmware Update
ATVERSW
R
Return the current
software version
number
DEZ
<MAJOR.MINOR.PATCH>
-
ATVERHW
R
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
W
Starts firmware update
process and transfer
the bin file checksum
-
-
-
ATFW
W
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
W
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
W
This command locks
the current firmware to
starts on power cycles.
It rewrites the first five
bytes in page0!
-
-
-
Document Feedback
AS7221
Smart Lighting Command Interface
55 │ 42
Command
Direction
Description
Format
Value Range
Default
ATFWC
R
This command gives
information about the
current firmware state
-
Bit0: Checksum of non-active firmware OK
Bit1: Error occurred
Bit2: Is bank 1 active
Bit3: Not used
Bit4: Current firmware is locked
Bit5: 56 kBytes transferred
Bit6: Not used
Bit7: Firmware update active
-
ATFWA
W
Only for backward
compatibility to support
old firmware update
mechanism. Always
returns with OK.
Because of flash
devices it is not
possible to increment
the address separately
(Page erase
necessary!)
-
-
-
Document Feedback
AS7221
Application Information
55 │ 43
11 Application Information
Figure 33, Figure 34 and Figure 35 showing typical application schematics for the AS7221. Figure 37
illustrates a routing example for the device and Figure 38 gives the recommended pad layout for the
LGA package.
11.1 Schematic
Figure 33:
Chromatic Color Tuning with Networking and Spectral Sensing (page 1)
Document Feedback
AS7221
Application Information
55 │ 44
Figure 34:
Chromatic Color Tuning with Networking and Spectral Sensing (page2)
Document Feedback
AS7221
Application Information
55 │ 45
Figure 35:
Chromatic Color Tuning with Networking and Spectral Sensing (page3)
Document Feedback
AS7221
Application Information
55 │ 46
11.2 PCB Layout
Figure 36:
Typical Layout Reading
In order to prevent interference, avoid trace routing feedthroughs with exposure directly under the
AS7221. An example routing is illustrated in the diagram.
The AS7221 Smart Lighting Integration Kit (SLIK) demo board with schematic and PCB layout
documentation is available from ams for additional design information.
Document Feedback
AS7221
Application Information
55 │ 47
11.3 PCB Pad Layout
Suggested PCB pad layout guidelines for the LGA package are shown. Flash Gold is recommended
as a surface finish for the landing pads.
Figure 37:
Recommended PCB Pad Layout (Top View)
(1) Unless otherwise specified, all dimensions are in millimeters.
(2) Add 0.05mm all around the nominal lead width and length for the PCB pad land pattern.
(3) This drawing is subject to change without notice.
Document Feedback
AS7221
Package Drawings & Markings
55 │ 48
12 Package Drawings & Markings
Figure 38:
20-Pin LGA Package Outline Drawing (Front Side Marking)
10x 2.025
PIN1 CORNER
INDEX AREA (BOTTOM VIEW)
20x 0.45 ±0.10
4x 0.26
4x 1.30
20 16
610
1
5
15
11
20x 0.30 ±0.10
10x 1.925
20x 0.10 ±0.05 0.30
2.20
2.50 ±0.20
aaa CSeating
plane
C
AS7221
XXXXX
4.70
4.50
0.388
Ø0.75 ±0.05
0.01
PIN1 CORNER
INDEX AREA
610
20 16
5
1
11
15
aaa C
(TOP VIEW)
A
0.1 B
C
M
AB
A
0.1 B
C
M
A
0.1 B
C
M
(1) All dimensions are in millimeters. Angles in degrees.
(2) Dimensioning and tolerancing conform to ASME Y14.5M-1994.
(3) XXXXX = tracecode
(4) This package contains no lead (Pb).
(5) This drawing is subject to change without notice.
RoHS
Green
Document Feedback
AS7221
Package Drawings & Markings
55 │ 49
Figure 39:
20-PIN LGA Package Outline Drawing (Back Side Marking)
(1) All dimensions are in millimeters. Angles in degrees.
(2) Dimensioning and tolerancing conform to ASME Y14.5M-1994.
(3) XXXXX = tracecode
(4) This package contains no lead (Pb).
(5) This drawing is subject to change without notice.
10x 2.025
PIN1 CORNER
INDEX AREA (BOTTOM VIEW)
20x 0.45 ±0.10
4x 0.26
4x 1.30
20 16
610
1
5
15
11
20x 0.30 ±0.10
10x 1.925
20x 0.10 ±0.05 0.30
2.20
2.50 ±0.20
aaa CSeating
plane
C
AS7221
XXXXX
4.70
4.50
0.388
Ø0.75 ±0.05
0.01
PIN1 CORNER
INDEX AREA
610
20 16
5
1
11
15
aaa C
(TOP VIEW)
A0.1 B
C
M
AB
A
0.1 B
C
M
A
0.1 B
C
M
Document Feedback
AS7221
Tape & Reel Information
55 │ 50
13 Tape & Reel Information
Figure 40:
Tape Dimensions
(1) All dimensions are in millimeters. Angles in degrees.
(2) Geometric dimensioning and tolerancing conform to ASME Y14.5M-1994.
(3) This drawing is subject to change without notice.
T
Do
1.5
+0.1
P2
2.0 ±0.05
Po
E1
0.0 Y
D1
1.50 MIN.
XX
R0.3 TYP.
Ko
SECTION Y-Y
Y
SECTION X-X
4.0 ±0.1
5.0 ±0.1
1.75 ±0.1
5.5 ±0.1
12.0 ±0.1
0.3 ±0.03
2,81 ±0.1 8.0 ±0.1 5.0 ±0.1
Document Feedback
AS7221
Soldering & Storage Information
55 │ 51
14 Soldering & Storage Information
The module has been tested and has demonstrated an ability to be reflow soldered to a PCB
substrate. The solder reflow profile describes the expected maximum heat exposure of components
during the solder reflow process of product on a PCB. Temperature is measured on top of the
component. The components should be limited to a maximum of three passes through this solder
reflow profile.
Figure 41:
Solder Reflow Profile Graph
Figure 42:
Solder Reflow Profile
Parameter
Reference
Device
Average temperature gradient in preheating
2.5°C/s
Soak time
tsoak
2 to 3 minutes
Time above 217°C (T1)
t1
Max 60s
Time above 230°C (T2)
t2
Max 50s
T1
T2
T3
TPEAK
Temperature in °C
Time in seconds
tSOAK
t1
t2
t3
Not to scale
Document Feedback
AS7221
Soldering & Storage Information
55 │ 52
Parameter
Reference
Device
Time above Tpeak – 10 °C (T3)
t3
Max 10s
Peak temperature in reflow
Tpeak
260°C
Temperature gradient in cooling
Max - 5°C/s
14.1 Manufacturing Process Considerations
The AS7221 package is compatible with standard reflow no-clean and cleaning processes including
aqueous, solvent or ultrasonic techniques. However, as an open-aperture device, precautions must be
taken to avoid particulate or solvent contamination as a result of any manufacturing processes,
including pick and place, reflow, cleaning, integration assembly and/or testing. Temporary covering of
the aperture is allowed. To avoid degradation of accuracy or performance in the end product, care
should be taken that any temporary covering and associated sealants/debris are thoroughly removed
prior to any optical testing or final packaging.
14.2 Storage Information
Moisture sensitivity optical characteristics of the device can be adversely affected during the soldering
process by the release and vaporization of moisture that has been previously absorbed into the
package. To ensure the package contains the smallest amount of absorbed moisture possible, each
device is baked prior to being dry packed for shipping. Devices are dry packed in a sealed aluminized
envelope called a moisture-barrier bag with silica gel to protect them from ambient moisture during
shipping, handling, and storage before use.
14.2.1 Shelf Life
The calculated shelf life of the device in an unopened moisture barrier bag is 12 months from the date
code on the bag when stored under the following conditions:
● Shelf Life: 12 months
● Ambient Temperature: <40 °C
● Relative Humidity: <90%
Rebaking of the devices will be required if the devices exceed the 12 month shelf life or the Humidity
Indicator Card shows that the devices were exposed to conditions beyond the allowable moisture
region.
Document Feedback
AS7221
Soldering & Storage Information
55 │ 53
14.2.2 Floor Life
The module has been assigned a moisture sensitivity level of MSL 3. As a result, the floor life of
devices removed from the moisture barrier bag is 168 hours from the time the bag was opened,
provided that the devices are stored under the following conditions:
● Floor Life: 168 hours
● Ambient Temperature: <30 °C
● Relative Humidity: <60%
If the floor life or the temperature/humidity conditions have been exceeded, the devices must be
rebaked prior to solder reflow or dry packing.
14.3 Rebaking Instructions
When the shelf life or floor life limits have been exceeded, rebake at 50 °C for 12 hours.
Document Feedback
AS7221
Revision Information
55 │ 54
15 Revision Information
Document Status
Product Status
Definition
Product Preview
Pre-Development
Information in this datasheet is based on product ideas in the planning phase
of development. All specifications are design goals without any warranty and
are subject to change without notice
Preliminary Datasheet
Pre-Production
Information in this datasheet is based on products in the design, validation or
qualification phase of development. The performance and parameters shown
in this document are preliminary without any warranty and are subject to
change without notice
Datasheet
Production
Information in this datasheet is based on products in ramp-up to full production
or full production which conform to specifications in accordance with the terms
of ams AG standard warranty as given in the General Terms of Trade
Datasheet
(discontinued)
Discontinued
Information in this datasheet is based on products which conform to
specifications in accordance with the terms of ams AG standard warranty as
given in the General Terms of Trade, but these products have been
superseded and should not be used for new designs
Changes from previous version to current revision v4-00
Page
Update Figure 2 Block Diagram
5
Update Figure 5, format
9
Update Optical Characteristic
12
Added diffusor functionality
15
Added scene ramps
15
Added Figure xx AS7221 workflow abstract
16
Update ALS, replacement TSL25911 due to TSL2572
16, 17, 23, 39
Added calibration TSL2572
17
Update dimming input
19
Added CCT_SEL mode
20
Update PWM output frequency
21
Update indicator LED behavior
22
Added fSCL max in Figure 22
24
Update intro UART command interface
28
Update Figure 27 SPI Timing Characteristic
29, 30
Update Figure 30 Serial Flash Overview
31
Update Figure 32 AT Command List
33-42
Added Figure 39 Backside Marking
49
● Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
● Correction of typographical errors is not explicitly mentioned.
Document Feedback
AS7221
Legal Information
55 │ 55
16 Legal Information
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten, Austria-Europe. Trademarks Registered. All rights reserved.
The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the
copyright owner.
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams
AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this
product into a system, it is necessary to check with ams AG for current information. This product is intended for use in
commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended
without additional processing by ams AG for each application. This product is provided by ams AG “AS IS” and any express or
implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are
disclaimed.
ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability
to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services.
RoHS Compliant & ams Green Statement
RoHS Compliant: The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our
semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not
exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant
products are suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green defines that in addition to RoHS compliance, our products are free of
Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material).
Important Information: The information provided in this statement represents ams AG knowledge and belief as of the date that
it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or
warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG
has taken and continues to take reasonable steps to provide representative and accurate information but may not have
conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers
consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for
release.
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ams AG
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Austria, Europe
Tel: +43 (0) 3136 500 0
Please visit our website at www.ams.com
Buy our products or get free samples online at www.ams.com/Products
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