ADBM-A350
Optical Finger Navigation
Data Sheet
Description
Features
The ADBM-A350 sensor is a small form factor (SFF) optical
finger navigation system.
Low power architecture
Self-adjusting power-saving modes for longer battery
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 Self-adjusting frame rate for optimum performance
phones.
life
High speed motion detection up to 20ips
Motion detect interrupt
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.
Finger detect interrupt
Soft click and Tap detect interrupt
Single Interrupt pin
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.
Optional PWM output to control LED driver to enable il-
lumination feature when finger is on the sensor
Optional switch input for center click function
Internal oscillator – no clock input needed
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.
Selectable 125, 250, 500, 750, 1000 and 1250 cpi
resolution
Single 1.8V supply voltage for analog and digital
Internal power up reset (POR)
Theory of Operation
Selectable Input/Output voltage at 1.8V or 2.8V
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.
nominal
4-wire Serial peripheral interface (SPI) or Two wire in-
terface (TWI)
Integrated chip-on-board LED with wavelength of
The ADBM-A350 contains an Image Acquisition System
(IAS), a Digital Signal Processor (DSP), and a communica-
tion system.
870nm
17-pin FPC module
The IAS acquires microscopic surface images via the lens
and illumination system. These images are processed
Applications
by the DSP to determine the direction and distance of Finger input devices
motion. The DSP calculates the Δx and Δy relative dis-
placement values.
Mobile devices
Integrated input devices
The host reads the Δx and Δy information from the sensor
Battery-powered input device
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.
PixArt 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.
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
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