ADBS-A320 Datasheet, PDF (1/55 Pages) AVAGO TECHNOLOGIES LIMITED – Optical Finger Navigation

ADBS-A320
Optical Finger Navigation
Data Sheet
Description
The ADBS-A320 sensor is a small form factor (SFF) LED
illuminated optical finger navigation system.
The ADBS-A320 is a low-power optical finger navigation
sensor. It has a new, low-power architecture and automatic
power management modes, making it ideal for battery-
and power-sensitive applications such as mobile phones.
The ADBS-A320 is capable of high-speed motion detection
– up to 15ips. In addition, it has an on-chip oscillator and
integrated LED to minimize external components.
There are no moving parts which means high reliability
and less maintenance for the end user. In addition, pre-
cision optical alignment is not required, facilitating high
volume assembly.
The sensor 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.
The ADBS-A320 is designed for use with ADBL-A321 lens.
The ADBL-A321 lens is the optical component necessary
for proper operation of the sensor.
Theory of Operation
The ADBS-A320 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-A320 contains an Image Acquisition System
(IAS), a Digital Signal Processor (DSP), and a communica-
tion 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 x and y relative dis-
placement values.
The host reads the x and y information from the sensor
serial port if a motion interrupt is published. The micro-
controller then translates the data into cursor navigation,
rocker switch, scrolling or other system dependent navi-
gation 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 15ips
 Self-adjusting frame rate for optimum performance
 Motion detect pin output
 Finger detect pin output
 Internal oscillator – no clock input needed
 Selectable 250, 500, 750, 1000 and 1250 cpi resolution
 Dual 2.8V/1.8V or single 2.8V supply options
 Selectable Input/Output voltage at 2.8V or 1.8V
nominal
 Serial peripheral interface (SPI) or Two wire interface
(TWI)
 Integrated chip-on-board LED with wavelength of
870nm
Applications
 Finger input devices
 Mobile devices
 Integrated input devices
 Battery-powered input device
Avago customers purchasing the ADBS-A320 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.
CAUTION: It is advised that normal static precautions be taken in handling and assembly
of this component to prevent damage and/or degradation which may be induced by ESD.