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PDF ADBM-A350 Data sheet ( Hoja de datos )
| Número de pieza | ADBM-A350 | |
| Descripción | Optical Finger Navigation | |
| Fabricantes | AVAGO | |
| Logotipo |  |
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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.
1 page  
Regulatory Requirements
Passes FCC or CISPR 22 Class B emission limits when assembled following Avago Technologies recommendations.
Passes IEC 61000-4-3 and IEC61000-4-6 Class A Immunity limits when assembled following Avago Technologies
recommendations.
Absolute Maximum Ratings
Parameter
Symbol Minimum Maximum
Units Notes
Storage Temperature
Analog and Digital Supply Voltage
TS
VDD
-40
-0.5
85
2.1
°C
V
I/O Supply Voltage
ESD (sensor only)
VDDIO
-0.5
3.7
2
V
kV All pins, human body model
JESD22-A114-E
Input Voltage
Latchup Current
VIN
-0.5
VDDIO+0.5
V
Iout 20 mA All Pins
Note: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are the stress ratings
only and functional operation of the device at these or any other condition beyond those indicated may affect device reliability.
Recommended Operating Conditions
Parameter
Operating Temperature
Analog and Digital
Supply Voltage [1]
I/O Supply Voltage [2]
Symbol
TA
VDD
VDDIO
Power Supply Rise Time
Power Supply Off Time for
Valid POR (Power on Reset)
Power Off Voltage Level for
Valid POR (Power on Reset)
Supply Noise (Sinusoidal)
Speed
Transient Supply Current
tVRT
tOFF
VOFF
VNA
S
IDDT
Minimum
-20
1.7
Typical
1.8
Maximum
70
2.1
Units
°C
Volts
1.65 1.8 or 2.8 3.6
Volts
0.001
10
10 ms
ms
0 300 mV
100 mV p-p
20 in/sec
80 mA
Notes:
1. Operating temperature of less than -20°C down to -30°C, minimum VDD of 1.8V must be met.
2. To ensure minimum leakage current, VDDIO should be greater than or equal to VDD
Notes
Including VNA noise.
Including VNA noise. Sets I/O
voltages. See fig 7.
0 to VDD. At minimum rise time, s/’
Refer to section “POR During Power
Cycling”
Refer to section “POR During Power
Cycling”
10 kHz - 50 MHz
Using prosthetic finger as surface
Max supply current for 500 sec
for each supply voltages ramp from
0 to 1.8 V
5
5 Page 
Fast Video Dump
ADBS-A350 comes with a unique feature that enables user
to capture the image the optical sensor is seeing on the
tracking surface. This is achieved through storing the pixel
data, transferring or dumping the pixels data out to the
host for processing and rebuilding the video dump image.
The rebuilding of video dump image is mainly converting
each 8-bit pixel data to form a grayscale digital image.
Some useful applications for this feature are sensor con-
tamination inspection at manufacturing lines, image rec-
ognition, motion sensing applications and etc.
Video Dump Signals Capturing and Decoding
64 burst cycles of FVD will be present on the MISO_SDA
and EVENT_INT pins after executing the fast video dump
commands.
Zooming into each burst cycle, 3 frames in each burst
cycle will be observed.
MISO_SDA 64 burst cycles (~500ms)
Fast Video Dump Setups and Commands
Fast Video Dump (FVD) in the sensor requires three main
signal lines for communications with host MCU as shown
below.
Pin
GPIO
MISO_SDA
EVENT_INT
Status
Input
Output
Output
Description
24MHz clock signal
Pixel data bits 7 to 4
Pixel data bits 3 to 0
EVENT_INT
GPIO (CLOCK)
Connect an external clock signal of up to 24MHz to GPIO
pin. Execute the FVD commands below and capture the
64burst cycles of data clocked out on the two output pins
(MISO_SDA and EVENT_INT).
FVD Commands
1. Power up sensor
2. Read register 0x00, to get returned value of 0x88
for correct product ID (ensure communication with
sensor is established)
3. Write register 0x3a with 0x5a
4. Write register 0x11 with 0x53
5. Write register 0x30 with 0x13
6. Write register 0x2b with 0x30
7. Write register 0x2c with 0x13
8. Write register 0x28 with 0x01 to initiate video dump.
9. Sensor will start to video dump for about 500ms (see
timing diagram on signals decoding versus actual
signal captured).
10. Once video dump is completed, write register 0x3a
with 0x5a to soft reset sensor back to normal operation.
(Note: During FVD, the sensor is in 3-wire SPI commu-
nication with host MCU by design. Therefore a soft
reset is necessary to reset back to 4-wire SPI commu-
nication for normal operation or to perform another
FVD)
11. To capture another 64 burst cycles, repeat Step
2- Step10.
Figure 4. Signals for frame start
As shown in Figure 4 above, frame start of video dump is
denoted by MISO_SDA pin and EVENT_INT pin clocking
high for 4 clock cycles or 4 x b’11 (binary 11). Then after 4
clock cycles, MISO_SDA pin will go low and EVENT_INT pin
remains high. This indicates pixel begin state.
11
11 Page | ||
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| PDF Descargar | [ Datasheet ADBM-A350.PDF ] | |
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