Photometric Sensor

for Gesture and Proximity

Data Sheet

ADUX1020

Rev. A

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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

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

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 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

ADUX1020

ADC

SDA

LEDX

VREF

AFE: SIGNAL CONDITIONING

GESTURE ENGINE

DIGITAL INTERFACE

CONTROL LOGIC

SCL

INT

LED DRIVER

POSITION

SENSOR

Figure 1.