ADBS-A350_17 Datasheet, PDF (1/16 Pages) Pixart Imaging Inc. – Optical Finger Navigation Chip

PixArt Imaging Inc.
ADBS-A350 General Datasheet
Optical Finger Navigation Chip
ADBS-A350: Optical Finger Navigation Chip
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
 Low power architecture
 Surface mount technology (SMT) device
 Self-adjusting power-saving modes for longer battery
life
 High speed motion detection up to 20 ips
 Self-adjusting frame rate for optimum performance
 Motion detect interrupt
 Finger detect interrupt
 Soft click and Tap detect interrupt
 Single Interrupt pin
 Optional PWM output for LED illumination
 Optional switch input for center click function
 Internal oscillator – no clock input needed
 Selectable 125, 250, 500, 750, 1000 and 1250 cpi
resolution
 Single 1.8 V supply voltage for analog and digital
 Internal power up reset (POR)
 Selectable Input/Output voltage at 1.8 V or 2.8 V
nominal
 4-wire Serial peripheral interface (SPI) or Two-wire
interface (TWI)
 Integrated chip-on-board LED with wavelength of
870 nm
Applications
 Finger input devices
 Mobile devices
 Integrated input devices
 Battery-powered input device
Ordering Information
Part Number
ADBS-A350
ADBL-A321
Type
28-pin SMD
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.
Version 1.0 | 05 Sep 2016 | 11010AEN
PixArt Imaging Inc. http://www.pixart.com
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