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PDF ADUX1020 Data sheet ( Hoja de datos )
| Número de pieza | ADUX1020 | |
| Descripción | Photometric Sensor | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Multifunction photometric sensor and signal conditioning
Fully integrated AFE, ADC, LED driver, and timing core
Usable for multiple optical measurement applications,
including gesture control and proximity sensing
Enables an ambient light rejection capability using both
optical and analog filtering
On-chip programmable flexible current sink for external LED
High sensitivity and signal-to-noise ratio (SNR)
High resolution position measurement
Gesture recognition with 0.5 cm to 15 cm range
Proximity sensing to 20 cm
400 kHz I2C interface
Gesture/proximity works under infrared (IR) transparent
glass or other materials
Simple integration with optics; no need for precise
alignment and no lens is required
Low power operation
1.8 V analog/digital core
8-lead, 2 mm × 3 mm, 0.65 mm height LFCSP
APPLICATIONS
Gesture for user interface (UI) control in portable devices
Industrial/automation monitoring
Presence detection
Angle sensing
Photometric Sensor
for Gesture and Proximity
ADUX1020
GENERAL DESCRIPTION
The ADUX1020 is a highly efficient photometric sensor with an
integrated 14-bit analog-to-digital converter (ADC) and a 20-bit
burst accumulator that works in concert with a flexible light
emitting diode (LED) driver. It is designed to modulate a LED
and measure the corresponding optical return signal. The digital
engine includes circuitry and control for data aggregation and
proximity detection.
The data output and device configuration use a 1.8 V I2C interface.
The control circuitry includes flexible LED pulse width and
period generation combined with synchronous detection. This
circuitry is complemented by a low noise, low power, and wide
dynamic range configurable analog front end (AFE), clock
generation, LED driver, and digital logic for position and smart
sample mode (event driven x, y coordinates, relative z data).
This complete AFE features ambient light rejection, avoiding
corruption due to external interference.
One inexpensive standard surface mount, broad angle or narrow
angle IR LED (depending upon application) is required. This
LED mounts externally to the ADUX1020.
Packaged in a small, clear mold, 2 mm × 3 mm, 8-lead LFCSP,
the ADUX1020 is specified over an operating temperature
range of −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
AFE: SIGNAL CONDITIONING
ADUX1020
POSITION
SENSOR
ADC
GESTURE ENGINE
DIGITAL INTERFACE
CONTROL LOGIC
SDA
SCL
INT
LEDX
LED DRIVER
Figure 1.
VREF
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADUX1020
Data Sheet
PERFORMANCE SPECIFICATIONS
VDD = 1.8 V, TA = full operating temperature range, unless otherwise noted.
Table 3.
Parameter
OPTICAL SENSOR
Wavelength
Field of View
Gesture Recognition Range
Proximity
DATA AQUISITION
Resolution
Output Data Rate
LED DRIVER
LED Current Slew Rate1
Rise
Fall
LED Peak Current
Driver Compliance Voltage
Test Conditions/Comments
Min Typ Max Unit
50 Hz update rate, 5 mA total current, hand sized target
5 Hz update rate
845 960 nm
120 Degrees
0.5 15 cm
0.5 20 cm
Single pulse
13 Bits
0.1 1400 Hz
TA = 25°C, ILED = 70 mA
Slew rate control setting = 0
Slew rate control setting = 7
Slew rate control setting = 0
Slew rate control setting = 7
LED pulse enabled
Voltage above ground, LEDX pin required for controlled LED driver operation
8
0.2
131
74
490
84
250
mA/μs
mA/μs
mA/μs
mA/μs
mA
V
100
90
80
70
60
50
40
30
20
10
0
400 450 500 550 600 650 700 750 800 850 900 950 1000
WAVELENGTH (nm)
Figure 2. Normalized Quantum Efficiency of Combined Optical Filter and Silicon Detector
Rev. A | Page 4 of 31
5 Page 
ADUX1020
THEORY OF OPERATION
The ADUX1020 operates as a gesture and proximity optical
sensor system, stimulating an LED and measuring the incident
angle of returning light. It is a highly integrated system
including an optical sensor, analog signal processing block,
digital signal processing block, and I2C communication port.
The optical sensor employed in this device is a photodiode that
measures the angle of incident light and produces a highly
linear output for a wide range of input angles.
The ADUX1020 can be configured in one of the following four
modes by the command from the host processor through I2C port.
• Idle mode
• Standby mode
• Proximity mode
• Sample/gesture mode
IDLE MODE
The ADUX1020 enters idle mode automatically after power-up,
and it stays in this low power mode until it receives a command
from the host processor to move to any of the three other modes.
STANDBY MODE
Standby mode is a power saving mode in which no data collection
occurs. This mode is the lowest power mode without cutting
the external power supply. In this mode, all register values are
retained. To place the device in standby mode, write 0x0 to
Register 0x45, Bits[3:0]. No I2C acknowledge (ACK) generates
for this write. Any write to this address causes the device to leave
standby mode.
PROXIMITY MODE
When the ADUX1020 is configured for proximity mode, it
pulses the LED based on the proximity configuration settings
including update rate, peak LED current, and number of pulses.
Proximity detection is performed by measuring the intensity of
the light reflected from objects over the LED and sensor. This
intensity is the sum of the four channels of the sensor. The
ADUX1020 can generate an interrupt for a specific intensity
event. An event is defined as the point when the intensity signal
meets certain intensity threshold criteria. Two thresholds in
proximity mode allow hysteresis: an on event and an off event
threshold.
The value in Register 0x2A defines the threshold for an on
event, and the ADUX1020 generates an interrupt when the
intensity of the received light becomes higher than this value.
The value in Register 0x2B defines the threshold for an off event,
and the ADUX1020 generates an interrupt when the intensity of
the received light becomes lower than this value.
Data Sheet
Upon receiving the interrupt, the host processor can read the
intensity from the output buffer of the ADUX1020. It can also
read the x and y coordinates of the detected object. The data
format of the first in, first out (FIFO) output of the ADUX1020,
can be specified using Register 0x45.
To place the device in proximity mode, write 0x1 to Register 0x45,
Bits[3:0].
SAMPLE/GESTURE MODE
In sample/gesture mode, the ADUX1020 uses a second set of
configuration registers and transmits LED pulses based on the
configuration including update rate, peak LED current, and
number of pulses, similar to the proximity mode. The LED
signaling in the proximity and sample modes are similar except
that a higher update rate is typically required for sample mode.
The ADUX1020 captures the coordinate samples for gesture
interpretation, triggered by the events defined in Register 0x3E
and Register 0x40.
When the start of a potential gesture is detected, the ADUX1020
can generate an interrupt. This feature allows the host processor
to sleep while awaiting gesture activity.
The event that triggers an interrupt can be either absolute
intensity or derivative of the intensity signal, and the ADUX1020
can generate an interrupt signal so that the host processor can
sleep while awaiting gesture activity.
To place the device in sample mode, write 0x8 to Register 0x45,
Bits[3:0].
USE OF MULTIPLE MODES
The ADUX1020 can programmatically enter sample/gesture mode
when a certain input threshold in proximity mode is reached.
The threshold, specified by a 16-bit number, can be set in
Register 0x2C. To enable this behavior, write 1 to Register 0x45,
Bit 10 and start the device in proximity mode.
Rev. A | Page 10 of 31
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADUX1020.PDF ] | |
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