AS7265x
Smart 18-Channel VIS to NIR Spectral_
ID 3-Sensor Chipset with Electronic
Shutter
General Description
The AS7265x chipset consists of three sensor devices AS72651
with master capability, AS72652 and AS72653. The multispec-
tral sensors can be used for spectral identification in a range
from visible to NIR. Every of the three sensor devices has 6 in-
dependent on-device optical filters whose spectral response is
defined in a range from 410nm to 940nm with FWHM of 20nm.
The AS72651, combined with the AS72652 (spectral response
from 560nm to 940nm) and the AS72653 (spectral response
from 410nm to 535nm) form an AS7265x 18-channel
multi-spectral sensor chip-set. Using the AS7265x chipset
requires the use of firmware. It must be loaded into a serial flash
via a UART interface. The list of
ams
tested serial flash memories
can be found in
Figure 56.
The components AS72651, AS72652
and AS72653 are pre-calibrated with a specific light source. The
information about the conditions of the performed calibration
(for example light source, gain, integration time) can be found
in the table of optical characteristics of the respective compo-
nent. Any operation other than these conditions might require
a new calibration in the application.
Each AS7265x device has two integrated LED drivers with
programmable current and can be timed for electronic shutter
applications.
The device family integrates Gaussian filters into standard
CMOS silicon via nano-optic deposited interference filter tech-
nology in LGA packages that also provide built-in apertures to
control the light entering the sensor array.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS7265x, Smart 18-Channel VIS to
NIR Spectral_ID 3-Sensor Chipset with Electronic Shutter are
listed below:
ams Datasheet
[v1-04] 2018-Jul-09
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AS7265x −
General Description
Figure 1:
AS7265x Chip-Set Benefits and Features
Benefits
Features
•
3 chip set including master device delivering 18
visible and NIR channels from 410nm to 940nm
each with 20nm FWHM
•
Compact 18-channel spectrometry chip-set
solution
•
UART or I²C slave digital Interface
•
Visible filter set realized by silicon interference
filters
•
16-bit ADC with digital access
•
No additional signal conditioning required
•
Programmable LED drivers
•
2.7V to 3.6V with I²C interface
•
Small, robust package, with built-in aperture
•
20-pin LGA package 4.5mm x 4.7mm x 2.5mm
-40°C to 85°C temperature range
Applications
The AS7265x applications include:
•
Product/Brand authentication
•
Anti-counterfeiting
•
Portable spectroscopy
•
Product safety/adulteration detection
•
Horticultural and specialty lighting
•
Material analysis
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AS7265x −
General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
AS7265x Chip-Set Block Diagram
VDD1
VDD2
AS72651
Communication
VDD
Spectral_ID
Sensor
VDD
LED Drivers
LED_IND
I2C_ENB
Micro
Controller
Unit (MCU)
RX / SCL_S
TX / SDA_S
INT
UART or
I
2
C Slave
Current
Control
LED_DRV
R
U
S
V
T
W
Firmware Interface
VDD
SDA_M
SCL_M
I
2
C Master
°C
OSC
16MHz
VDD
MISO
SLV1_RESN
SLV2_RESN
RESN
SPI
Master
MOSI
SCK
CSN
Serial Flash
Memory
GND
VDD1
VDD2
VDD1
VDD2
AS72652
Spectral_ID
Sensor
Communication
VDD
LED Drivers
AS72653
Spectral_ID
Sensor
Communication
VDD
LED Drivers
VDD
VDD
LED_IND
LED_IND
SCL_S
SDA_S
G
I C Slave
2
H
K
I
L
J
Current
Control
SCL_S
LED_DRV
A
I C Slave
2
B
E
C
F
SDA_S
D
Current
Control
LED_DRV
°C
OSC
16MHz
°C
OSC
16MHz
RESN
RESN
GND
GND
Note(s):
1. Refer to the Application Diagram in
Figure 60.
ams Datasheet
[v1-04] 2018-Jul-09
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AS7265x −
Pin Assignments
Pin Assignments
The device pin assignments are described below.
Figure 3:
Pin Diagram of AS7265x (Top View)
20
16
1
15
5
11
6
10
Figure 4:
AS72651 Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
SLV1_RESN
RESN
SCK
MOSI
MISO
CSN
NC
I2C_ENB
SCL_M
SDA_M
Pin Type
Digital Input and Output
Digital Input
Digital Output
Digital Input and Output
Digital Input and Output
Digital Output
Description
Reset pin for Slave 1 e.g. AS72652, active low
Reset pin, active low (with internal pull-up to
VDD)
SPI serial clock
SPI MOSI
SPI MISO
Chip select for external flash
Not functional, no connect
Digital Input
Digital Output
Digital Input and Output
Selects UART (low) or I²C (high) operation
I²C master clock for communication with
AS72652 and AS72653
I²C master data for communication with AS72652
and AS72653
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AS7265x −
Pin Assignments
Pin No.
11
12
13
14
15
16
17
18
19
20
Note(s):
Pin Name
RX / SCL_S
TX / SDA_S
INT
VDD2
LED_DRV
GND
VDD1
LED_IND
NC
SLV2_RESN
Pin Type
Digital Input and Output
Digital Input and Output
Digital Output
Voltage Supply
Analog Output
Supply
Voltage Supply
Analog Output
Description
RX (UART) or SCL_S (I²C slave) depending on
I2C_ENB setting
TX (UART) or SDA_S (I²C slave) depending on
I2C_ENB setting
INT is active low
Voltage supply
LED driver output for driver LED, current sink
Ground
Voltage supply
LED driver output for indicator LED, current sink
Not functional, no connect
Digital Output
Reset pin for slave 2 e.g. AS72653, active low
1. Pin out is valid for firmware versions from 11 and later.
Figure 5:
AS72652 and AS72653 Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
NC
RESN
NC
NC
NC
NC
NC
NC
SCL_S
SDA_S
Pin Type
Description
Not functional, no connect
Digital Input
Reset pin, active low (with internal pull-up to
VDD)
Not functional, no connect
Not functional, no connect
Not functional, no connect
Not functional, no connect
Not functional, no connect
Not functional, no connect
Digital Input and Output
Digital Input and Output
I²C slave clock for communication with master
AS72651
I²C slave data for communication with master
AS72651
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