Datasheet
DS000504
AS7341
11-Channel Spectral Sensor Frontend
v2-00 • 2019-Apr-16
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AS7341
Content Guide
Content Guide
1
1.1
1.2
1.3
General Description....................... 3
Key Benefits & Features .............................. 3
Applications .................................................. 4
Block Diagram .............................................. 4
9.1
9.2
9.3
9.4
9.5
I²C Address ................................................ 21
I²C Write Transaction ................................. 21
I²C Read Transaction ................................. 22
Timing Characteristics ............................... 22
Timing Diagrams ........................................ 23
2
3
3.1
3.2
Ordering Information ..................... 5
Pin Assignment ............................. 6
Pin Diagram .................................................. 6
Pin Description ............................................. 6
10
10.1
10.2
Register Description ................... 24
Register Overview ...................................... 24
Detailed Register Description .................... 26
11
11.1
11.2
11.3
Application Information .............. 58
Schematic .................................................. 58
PCB Pad Layout......................................... 59
Application Optical Requirements .............. 60
4
5
6
7
8
8.1
8.2
8.3
8.4
8.5
Absolute Maximum Ratings .......... 7
Electrical Characteristics .............. 8
Optical Characteristics .................. 9
Typical Operating
Characteristics ............................. 15
Functional Description ................ 16
Channel Architecture .................................. 17
Sensor Array .............................................. 18
GPIO/INT .................................................... 18
SMUX ......................................................... 18
Integration Mode ........................................ 19
12
13
14
14.1
Package Drawings & Markings... 61
Tape & Reel Information ............. 62
Soldering & Storage Information 64
Storage Information ................................... 65
15
16
Revision Information ................... 66
Legal Information ........................ 67
9
I²C Interface .................................. 21
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AS7341
General Description
1
General Description
AS7341 is an 11-channel spectrometer for spectral identification and color matching applications used
in mobile devices. The spectral response is defined in the wavelengths from approximately 350nm to
1000nm. 6 channels can be processed in parallel by independent ADCs while the other channels are
accessible via a multiplexer. 8 optical channels cover the visible spectrum, one channel can be used
to measure near infra-red light and one channel is a photo diode without filter (“clear”). The device
also integrates a dedicated channel to detect 50Hz or 60Hz ambient light flicker. The flicker detection
engine can also buffer data for calculating other flicker frequencies externally. The NIR channel in
combination with the other VIS channel may provide information of surrounding ambient light
conditions (light source detection).The device can also be synchronized to external signals via pin
GPIO.
AS7341 integrates filters into standard CMOS silicon via Nano-optic deposited interference filter
technology and its package provides a built in aperture to control the light entering the sensor array.
Control and Spectral data access is implemented through a serial I²C interface. The device is available
in an ultra-low profile package with dimensions of 3.1mm x 2mm x 1mm.
1.1
Key Benefits & Features
The benefits and features of AS7341,
11-Channel Spectral Sensor Frontend,
are listed below:
Figure 1: Added Value of Using AS7341
Benefits
Color matching and skin tone measurement in
mobile phones
Features
8 optical channels distributed over the visible
spectral range + clear and NIR channel to
accurately measure and match colors in mobile
phones
●
1.8VDD operation
●
Configurable sleep mode
●
Interrupt-driven device
●
●
●
●
Dedicated channel
Independently configurable timing and gain
Automatic gain adjustment
50Hz and 60Hz flicker detection flags
Low power consumption and minimum I²C traffic
Integrated ambient light flicker detection on
chip and light source detection through NIR
channel
Electronic shutter/external trigger functionality
External photodiodes to expand detection range
GPIO can be used as external trigger input
GPIO can be used as input for external InGaAs
PDs for MIR range.
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AS7341
General Description
1.2
Applications
●
●
●
Reflective object color sensor in mobile phones
Color management for displays
Ambient light flicker detection for camera assist (flicker detection)
1.3
Block Diagram
The functional blocks of this device are shown below:
Figure 2 : Functional Blocks of AS7341
1.8V
VDD
PGND
GND
AS7341
8CH VIS
NIR/CLE AR
GPIO
LDR
e.g.:
Flash LED
1.8V
light
source
MCU
SCL
SDA
350-100 0nm
sensor
light in
reflective
surface
INT
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AS7341
Ordering Information
2
Ordering Information
Ordering Code
AS7341-DLGT
AS7341-DLGM
Package
OLGA-8
OLGA-8
Delivery Form
Tape & Reel 13-inch
Tape & Reel 7-inch
Delivery Quantity
5000 pcs/reel
500 pcs/reel
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