ADBM-A350 Datasheet, PDF (1/55 Pages) AVAGO TECHNOLOGIES LIMITED – Optical Finger Navigation

ADBM-A350
Optical Finger Navigation
Data Sheet
Description
The ADBM-A350 sensor is a small form factor (SFF) optical
finger navigation system.
The ADBM-A350 is a low- power optical finger naviga-
tion 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 ADBM-A350 is capable of high-speed motion
detection – up to 20ips. In addition, it has an on-chip
oscillator and integrated LED for optical navigation to
minimize external components.
There are no moving parts, thus provide high reliabil-
ity and less maintenance for the end user. In addition,
precision 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 into a 17-pin FPC module for ease of assembly
via ZIF connector.
Theory of Operation
The ADBM-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 ADBM-A350 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 Δx and Δy relative dis-
placement values.
The host reads the Δx and Δy 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
 Self-adjusting power-saving modes for longer battery
life
 High speed motion detection up to 20ips
 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 to control LED driver to enable
illumination feature when finger is on the sensor
 Optional switch input for center click function
 Internal oscillator – no clock input needed
 Selectable 125, 250, 500, 750, 1000 and 1250 cpi
resolution
 Single 1.8V supply voltage for analog and digital
 Internal power up reset (POR)
 Selectable Input/Output voltage at 1.8V or 2.8V
nominal
 4-wire Serial peripheral interface (SPI) or Two wire in-
terface (TWI)
 Integrated chip-on-board LED with wavelength of
870nm
 17-pin FPC module
Applications
 Finger input devices
 Mobile devices
 Integrated input devices
 Battery-powered input device
Avago customers purchasing the ADBM-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.
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.