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PixArt Imaging Inc.

ADBS-A350 General Datasheet

Optical Finger Navigation Chip

PixArt Imaging Inc. http://www.pixart.com

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Version 1.0 | 05 Sep 2016 | 11010AEN

Description

The ADBS-A350 chip is a small form factor (SFF) LED

illuminated optical finger navigation system. It is

designed with low-power architecture and automatic

power management modes, making it ideal for battery-

and power-sensitive applications such as mobile phones.

The ADBS-A350 is capable of high-speed motion

detection– up to 20 ips. In addition, it has an on-chip

oscillator and integrated LED to minimize external

components. The chip is programmed via registers

through either a serial peripheral interface or a two wire

interface port.

It is packaged in a 28 I/O surface mountable package.

There are no moving parts, thus provide high reliability

and less maintenance for the end user. In addition,

precision optical alignment is not required, facilitating

high volume assembly. The ADBS-A350 is designed for

use with ADBL-A321 lens. The ADBL-A321 lens is the

optical component necessary for proper operation of

the chip.

Theory of Operation

The ADBS-A350 is based on Optical Finger Navigation

(OFN) Technology, which measures changes in position

by optically acquiring sequential surface images (frames)

and mathematically determining the direction and

magnitude of movement.

The ADBS-A350 contains an Image Acquisition System

(IAS), a Digital Signal Processor (DSP), and a

communication system. The IAS acquires microscopic

surface images via the lens and illumination system.

These images are processed by the DSP to determine the

direction and distance of motion. The DSP calculates the

Δx and Δy relative displacement values. The host reads

the Δx and Δy information from the chip serial port if a

motion interrupt is published. The microcontroller then

translates the data into cursor navigation, rocker switch,

and scrolling or other system dependent navigation

data.

Features

life

resolution

nominal

interface (TWI)

870 nm

Applications

 Finger input devices

 Mobile devices

 Integrated input devices

 Battery-powered input device

Ordering Information

Part Number

Type

ADBS-A350

28-pin SMD

ADBL-A321

Lens

PixArt customers purchasing the ADBS-350 OFN product

are eligible to receive a royalty free license to our US

patents 6977645, 6621483, 6950094, 6172354 and

7289649, for use in their end products.