AS7220
Calibrated CCT and Lumen
Maintenance Smart Lighting Manager
General Description
The AS7220 Smart Lighting Manager is part of the
ams
Cognitive Lighting™ family of products that enable lights to
autonomously adapt to human lighting and energy
conservation needs. The device is equipped with an advanced
Cognitive Lighting Engine (CLE) to optimize CCT and lumen
maintenance and color maintenance via a combination of PWM
and/or 0-10V controls with dimming ballasts. Daylight
harvesting can also be performed by adding an I²C connected
ams
ambient light sensor.
AS7220 XYZ chromatic white/color 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 AS7220 integrates standard observer filters into
standard silicon via nano-optic deposited interference filters
which deliver high-stability over time and temperature. The
LGA package includes a built-in aperture to control light
entering the sensor array. Integrated intelligence enables
lifetime CCT calibration to within 2-4 Macadam steps.
The AS7220 connects to standard 0-10V dimmer inputs and
drives 0-10V 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 LED drivers or
multi-channel ballasts for constant voltage LED lighting
architectures.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-00] 2017-Feb-16
Page 1
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AS7220 −
General Description
Key Benefits & Features
The benefits and features of this device are listed below:
Figure 1:
Added Value of Using AS7220
Benefits
•
Accurate maintenance of CCT and daylight
responsive lighting
•
Lifetime-calibrated sensing with minimal drift
over time or temperature
•
Optional user/manufacturer configurable CCT
maintenance and/or Lumen maintenance
•
Compatible with standard dimmer controls and
occupancy sensors
•
Directly interfaces to LED string circuity via
PWM outputs
Features
•
Calibrated XYZ tri-stimulus color sensing for direct
translation to CIE 1931/1976 standard observer color
maps
•
Filter set realized by silicon interference filters
•
If enabled, desired CCT and/or Lumen settings are
read by the Cognitive Light Engine and maintained
by using spectrally tuned light
•
Directly interfaces to 0-10V dimmer controls and
standard occupancy sensors
•
Built-in PWM generators to dim and control
warm/cool luminaire LED strings
•
12-bit resolution for precise control down to 1%
•
0-10V analog output for control of conventional
dimming ballasts in a current steering design
•
20-pin LGA package 4.5mm x 4.7mm x 2.5mm with
integrated aperture
•
-40 °C to 85°C
•
Directly interfaces to ballast via 0-10V
•
Small package, wide operating range with
critical optics built-in
Applications
Autonomous, solid-state lighting manager for precision fixed
CCT and daylight harvesting:
•
Configurable CCT and/or lumen maintenance
applications
•
Luminaires intended to meet California Title 24
daylighting requirements
Page 2
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ams Datasheet
[v1-00] 2017-Feb-16
AS7220 −
General Description
Block Diagram
Figure 2:
Functional Blocks of AS7220
VDD
VDDHV
Outputs
VDD
VDDHV
VDD
Optional Inputs
VDD
VDDHV
0-10V
DAC
Cognitive Lighting
Engine (CLE)
PWM_1 / 0_10V_O
PWM
Generator
PWM
PWM_2
PWM_3
0_10V_DIM
AUX
Dimming &
Auxiliary Mode
VDD
SDA_M
SCL_M
Chromatic White
XYZ Sensors
I C Master
VDD
DAY_EN
Daylighting
Enable/Disable
VDD
2
X
Y
Z
Setup
SYNC / RESN
MODE
LED_IND
°C
VDD
OSC
16MHz
MISO
SPI
Master
LDIM_MAX
Set Max LUX
Target for
0_10V_DIM pin
MOSI
SCK
CSN_SD
GND
Functional Blocks of AS7220:
The AS7220 provides closed loop Chromatic White sensing and PWM tuning while
interfacing to local controls or other sensors
ams Datasheet
[v1-00] 2017-Feb-16
Page 3
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AS7220 −
Pin Assignments
Pin Assignments
Figure 3:
Pin Diagram of AS7220 (Top View)
20
16
1
15
5
11
6
10
Figure 4:
Pin Description of AS7220 (20 Pin LGA)
Pin Number
1
Pin Name
PWM_3
SYNC
Digital PWM 3
SYNC input
Reset pin, active low
SPI serial clock
SPI MOSI
SPI MISO
Description
2
RESN
3
4
5
6
7
8
9
10
11
12
SCK
MOSI
MISO
CSN_EE
CSN_SD
AUX
SCL_M
SDA_M
DAY_EN
LDIM_MAX
Chip select for the required external serial flash memory, active low
Chip select for SD Card interface, active low
Auxiliary mode input pin
I²C master clock pin
I²C master data pin
Daylight enable, active high
Sets maximum lumen for 0_10V_DIM inputs
Page 4
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ams Datasheet
[v1-00] 2017-Feb-16
AS7220 −
Pin Assignments
Pin Number
13
14
15
16
17
18
19
Pin Name
0_10V_DIM
VDDHV
MODE
GND
VDD
LED_IND
PWM_1
0_10V_O
0-10V input dimming pin
High voltage supply
Mode selection pin
Ground
Low voltage supply
Description
LED driver output for indicator LED, current sink
Digital PWM 1
0-10V output pin
Digital PWM 2
20
PWM_2
ams Datasheet
[v1-00] 2017-Feb-16
Page 5
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