Datasheet
DS000556
AS73211
XYZ True Color Sensor with I²C Interface
v3-01 • 2018-Feb-07
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AS73211
Content Guide
Content Guide
1
1.1
1.2
1.3
General Description....................... 3
Key Benefits & Features .............................. 4
Applications .................................................. 4
Block Diagram .............................................. 4
7.20
7.21
I²C Addressable Register Space ............... 42
I²C General Procedure to start with the
AS73211 .................................................... 43
8
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
Register Description ................... 44
Register Overview ...................................... 44
Operational State Register – OSR ............. 44
API Generation Register – AGEN .............. 46
Configuration Register - CREG1, CREG2
and CREG3 ................................................ 47
Register – BREAK ..................................... 51
Register – EDGES ..................................... 51
Register – OPTREG .................................. 51
Output Register Bank ................................. 52
2
3
3.1
3.2
Ordering Information ..................... 6
Pin Assignment ............................. 7
Pin Diagram .................................................. 7
Pin Description ............................................. 8
4
5
6
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
Absolute Maximum Ratings .......... 9
Electrical Characteristics ............ 10
Typical Optical Characteristics .. 13
Functional Description ................ 14
Operational States ..................................... 14
Configuration State .................................... 14
Measurement State .................................... 14
Measurement Modes ................................. 15
Continuous Measurement Mode – CONT.. 16
Command Measurement Mode – CMD ..... 17
Synchronous Measurement Mode – SYNS 19
Synchronous Measurement Start and End
Mode – SYND ............................................ 20
Energy Saving Options .............................. 21
Power Down ............................................... 21
Standby ...................................................... 23
Examples .................................................... 24
Transfer Function ....................................... 28
Divider ........................................................ 37
Conversion Time Measurement in SYND
Mode........................................................... 38
Temperature Measurement........................ 39
I²C Communication .................................... 39
I²C Write Protocol ....................................... 41
I²C Read Protocol ....................................... 41
9
9.1
9.2
9.3
Application Information .............. 56
Schematic .................................................. 56
External Components ................................ 56
PCB Layout ................................................ 57
10
11
12
13
13.1
13.2
13.3
13.4
13.5
Package Drawings ....................... 58
Tape & Reel Information ............. 59
Soldering & Storage Information 60
Application Notes ........................ 61
Narrowband Luminous Sources ................ 61
Angle of Incidence ..................................... 61
Effects of Temperature .............................. 61
Notes for Manufacturing............................. 61
Sensor Calibration ..................................... 62
14
15
Revision Information ................... 64
Legal Information ........................ 65
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AS73211
General Description
1
General Description
The AS73211 is a low power, low noise integrated color sensor. Three channels convert light signals
via photodiodes to a digital result and realize a continuous or triggered measurement. In front of the
three photodiodes there are optical filter mounted for X-, Y- and Z-signals respectively. The irradiance
responsivity can be set in a range of 12 steps by a factor of two for each step. The conversion time is
internally controlled over a wide range of 15 steps by a factor of two for each step. With the input pin
(SYN) the conversion time can be externally controlled to adapt the measurement to the given
environment and time base.
With its irradiance responsivity factor and conversion time the AS73211 supports an overall huge
dynamic range up to 3.43E+10 (resolution multiplied by gain range). It achieves an accuracy of up to
24-bit signal resolution (internal via I²C and shifter 16 bit) with an irradiance responsivity per count
down to 0.5pW/cm².
=
= .
= .
For high robustness at high sensitivity, the AS73211 has an inherent ripple rejection of the
50Hz / 60Hz external disturbances. Automatic Power Down (sleep function) between subsequent
measurements offers operation with very low current consumption. Further, a synchronized mode and
other control modes adjustable by user programming can be used. The supported operating modes of
the AS73211 are:
●
●
●
CMD Mode – single measurement and conversion (controlled via I²C interface),
CONT Mode – continuous measurement and conversion (periodically recurring measuring
cycles) start and stop controlled via I²C interface,
SYN[x] Modes - synchronized measurement and conversion:
●
●
[SYNS Mode] synchronization of start via control signal at pin SYN,
[SYND Mode] synchronization of start and stop of measuring cycles via control signal at
pin SYN.
The conversion data is accessed by the I²C interface with programmable slave addresses via
16-bit / 400 kHz fast mode. The measurement of the actual conversion time for an external triggered
measurement can be performed. The measurement modes will not affect the settings of the irradiance
responsivity and conversion time. Further, the converter supports functions like Power Down and
Standby, therefore it is suitable for mobile applications. Based on the high flexibility the AS73211 is
suitable as an optical converter for three different wave-lengths. The device achieves a high dynamic
range in back light applications and in the measurements of integral intensity of pulsed light. That
makes the color sensors excellently suited for photometry applications (brightness, color coordinate
and/or color temperature), for determining current values for control of spectrally mixed LED light
sources or as sensors for display and (back)light calibration and mobile devices for light
measurement. The AS73211 contains an integrated temperature sensor for rough compensation of
the thermic behavior of light sources. The device is available in a small SMD package.
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AS73211
General Description
1.1
Key Benefits & Features
The benefits and features of AS73211,
XYZ True Color Sensor with I²C Interface,
are listed below:
Figure 1:
Added Value of Using AS73211
Benefits
Light control measurement based on CIE
1931/DIN 5033
Brightness, color coordinate and/or color
temperature control
Usable under poor lighting conditions
Mobile applications
Harsh environmental applications
Temperature compensation
Features
JENCOLOR
®
interference filter technology
High dynamic range up to 3.43E+10 (16 … Bit
24
ADC)
High sensitivity up to 2.1M counts/(µW/cm²)
Smallest LSB 0.5pW/cm²
Low power operation, Power on Reset, Power
down and standby, small QFN package
-40°C up to 125°C operation temperature range
On-chip temperature sensor
1.2
Applications
●
●
●
●
●
●
●
●
LED lighting control management for solid-state lighting applications (SSL)
Cabin lighting, daylight management / Human and Color Centric Lighting (HCL and CCL)
Ambient light color detection / correction
(O)LED display aging compensation and dynamic display color balancing
Portable light color measurement
Digital light projection (DLP)
Printer, Smartphone, PDA, tablet PCs, LCD-TVs, digital picture, frames, digital cameras color
enhancement
Photometry (brightness, color coordinate and/or color temperature)
1.3
Block Diagram
Figure 2 shows the main components of the AS73211. The photodiodes convert the incoming light to
a photo current and with subsequent current-to-digital converter to digital data. An internal reference
generator provides all necessary references for the A/D conversion and the photodiodes by using an
external resistor R
EXT
at pin REXT. The results of the A/D conversion are stored in three 16-bit
registers and can be accessed via I²C interface. For the externally triggered start or start and stop of
the measurement, the input pin SYN can be used. The output READY reflects the status of the
conversion. The internal temperature sensor delivers the on-chip temperature, stored as 12-bit value
in a 16-bit register, which can be accessed via I²C interface, too. The pins A0 and A1 set the I²C slave
address. Separated analog and digital power supply and ground pins reduces noise coupling.
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AS73211
General Description
Figure 2:
Functional Blocks of AS73211
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