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PDF ADNS-2051 Data sheet ( Hoja de datos )
| Número de pieza | ADNS-2051 | |
| Descripción | Optical Mouse Sensor | |
| Fabricantes | Agilent Technologies | |
| Logotipo |  |
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Agilent ADNS-2051
Optical Mouse Sensor
Data Sheet
Description
The ADNS-2051 is a low cost
optical sensor used to implement a
non-mechanical tracking engine for
computer mice.
It is based on optical navigation
technology, which measures
changes in position by optically
acquiring sequential surface images
(frames) and mathematically deter-
mining the direction and magnitude
of movement.
The sensor is housed in a 16-pin
staggered dual inline package (DIP)
that is designed for use with the
HDNS-2100 Lens and HDNS-2200
Clip and HLMP-ED80 (639 nm LED
illuminator source). There are no
moving parts, and precision optical
alignment is not required,
facilitating high volume assembly.
The output format is two channel
quadrature (X and Y direction)
which emulates encoder photo-
transistors. The current X and Y
information are also available in
registers accessed via a serial port.
Default resolution is specified as
400 counts per inch (cpi), with
rates of motion up to 14 inches
per second (ips).
Resolution can also be pro-
grammed to 800 cpi.
The part is programmed via a two
wire serial port, through registers.
Theory of Operation
The ADNS-2051 is based on
Optical Navigation Technology.
It contains an Image Acquisition
System (IAS), a Digital Signal
Processor (DSP), a two-channel
quadrature output, and a two wire
serial port.
The IAS acquires microscopic
surface images via the lens and
illumination system provided by
the HDNS-2100, 2200, and
HLMP-ED80 LED. These images
are processed by the DSP to
determine the direction and
distance of motion. The DSP
generates the ∆x and ∆y relative
displacement values that are
converted into two channel
quadrature signals.
Features
• Precise optical navigation tech-
nology
• No mechanical moving parts
• Complete 2D motion sensor
• Serial interface and/or
quadrature interface
• Smooth surface navigation
• Programmable frame speed up to
2300 frames per sec (fps)
• Accurate motion up to 14 ips
• 800 cpi resolution
• High reliability
• High speed motion detector
• No precision optical alignment
• Wave solderable
• Single 5.0 volt power supply
• Shutdown pin for USB suspend
mode operation
• Power conservation mode during
times of no movement
• On chip LED drive with regulated
current
• Serial port registers
– Programming
– Data transfer
• 16-pin staggered dual inline
package (DIP)
Applications
• Mice for desktop PCs,
workstations, and portable PCs
• Trackballs
• Integrated input devices
1 page  
SERIAL PORT
SCLK
SDIO
QUADRATURE
OUTPUTS
XA
XB
YA
YB
R_BIN
LED
XY_LED
SERIAL PORT
OSCILLATOR
POWER ON
RESET
IMAGE
PROCESSOR
LED
DRIVE
OSC_IN
OSC_OUT
RESONATOR
REFA
REFB
PD
VOLTAGE
REFERENCE
VDD
GND
GND
5 VOLT
POWER
Figure 6. Block diagram of ADNS-2051 optical mouse sensor.
Design Considerations for Improving
ESD Performance
The flange on the lens has been
designed to increase the creepage
and clearance distance for elec-
trostatic discharge. The table on
the right shows typical values
assuming base plate construction
per the Agilent supplied IGES file
and HDNS-2100 lens flange.
Typical Distance
Creepage
Clearance
Millimeters
16.0
2.1
For improved ESD performance,
the lens flange can be sealed (i.e.
glued) to the base plate.Note that
the lens material is polycarbonate
and therefore, cyanoacrylate-
based adhesives or other
adhesives that may damage the
lens should NOT be used.
The trimmed lens, HDNS-
2100#001, is not recommended
for corded applications due to the
ESD spec requirement.
PCB
LENS/LIGHT PIPE
BASE PLATE
SURFACE
Figure 7. PCB assembly.
5
SENSOR
CLIP
LED
5 Page 
PD Pin Timing
PD
IDD
tpd
Figure 12. PD timing normal mode.
75 FRAMES
705 µs
tpupd
tCOMPUTE (SEE FIGURE 15)
PD
ILED
SCLK
REGISTER
READ OPERATION
Figure 13. PD timing sleep mode.
tCOMPUTE
PD
tPDW
700 µs
(POWER DOWN)
Figure 14. PD minimum pulse width.
PD
OSCILLATOR
START
250 µs
LED
CURRENT
RESET
COUNT
455 µs
INITIALIZATION
2410 µs
NEW ACQUISITION
SCLK
705 µs
OPTIONAL SPI TRANSACTIONS
WITH OLD IMAGE DATA
tCOMPUTE
SPI TRANSACTIONS
WITH NEW IMAGE DATA
AT DEFAULT FRAME RATE
Figure 15. Detail of PD falling edge timing.
Quadrature Mode Timing
The output waveforms emulate
the output from encoders. With
the resolution set to 400 cpi,
from one to five quadrature states
can exist within one frame time.
The minimum state time is
133 µs. If the resolution is
800 cpi, then up to ten quadra-
ture states can exist within a
frame time. If the motion within
a frame is greater than these
values, the extra motion will be
reported in the next frame. The
following diagrams (see Figures
16, 17, and 18) show the timing
for positive X motion, to the right
or positive Y motion, up. If a
power down via the PD pin oc-
curs during a transfer, the trans-
fer will resume after PD is
de-asserted. The timing for that
quadrature state will be increased
by the length of the PD time.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADNS-2051.PDF ] | |
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