ADUX1020 Datasheet, PDF (1/32 Pages) Analog Devices – Photometric Sensor for Gesture and Proximity

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
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