Agilent ADNS-2051
Optical Mouse Sensor
Data Sheet
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
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-XXXXX
(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-XXXXX 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.
Outline Drawing of ADNS-2051 Optical Mouse Sensor
Pinout
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
SCLK
XA
XB
YB
YA
XY_LED
REFA
REFB
OSC_IN
GND
OSC_OUT
GND
V
DD
R_BIN
PD
SDIO
Description
Serial port clock (input)
XA quadrature output
XB quadrature output
YB quadrature output
YA quadrature output
LED control
Internal reference
Internal reference
Oscillator input
System ground
Oscillator output
System ground
5.0 volt power supply
LED current bin resistor
Power down pin, active high
Serial data (input and output)
Figure 1. Top view.
REFA
REFB
7
9
8
OSC_IN
YA
XY_LED
5
11
6
10
GND
OSC_OUT
YB
4
12
GND
XA
XB
2
3
16
SCLK
1
15
PD
R_BIN
SDIO
A2051
YYWW
14
13
V
DD
YYWW
A2051
PIN 1
22.30
(0.878)
0.99
(0.039)
3.18
(0.125)
9.10
(0.358)
5.15
(0.203)
LEAD WIDTH 0.50
(0.020)
LEAD OFFSET 1.27
(0.050)
LEAD PITCH
2.54
(0.100)
6.02
(0.237)
13.38
(0.527)
NOTES:
1. DIMENSIONS IN MILLIMETERS (INCHES).
2. DIMENSIONAL TOLERANCE: ± 0.1 mm.
3. COPLANARITY OF LEADS: 0.1 mm.
4. LEAD PITCH TOLERANCE: ± 0.15 mm.
5. CUMULATIVE PITCH TOLERANCE: ± 0.15 mm.
6. ANGULAR TOLERANCE: ± 3.0 DEGREES.
7. MAXIMUM FLASH + 0.2 mm.
8. CHAMFER (25 DEGREES x 2) ON THE TAPER SIDE OF THE LEAD.
1.42
(0.056)
KAPTON TAPE
0.25
(0.010)
5° TYP.
6.17
(0.243)
12.34
(0.486)
4.55
(0.179)
∅
5.60
(0.220)
∅
0.80
(0.032)
Figure 2. Package outline drawing.
2
Overview of Optical Mouse Sensor Assembly
2D Assembly Drawing of ADNS-2051
Figures 3 and 4, shown with
HDNS-2100, HDNS-2200, and
HLMP-ED80-XXXXX.
Agilent Technologies provides an
IGES file drawing describing the
base plate molding features for
lens and PCB alignment.
The components interlock as
they are mounted onto defined
features on the base plate.
The ADNS-2051 sensor is
designed for mounting on a
through hole PCB, looking down.
There is an aperture stop and
features on the package that
align to the lens (see Figure 3).
The HDNS-2100 lens provides
optics for the imaging of the
surface as well as illumination of
the surface at the optimum angle.
Features on the lens align it to
the sensor, base plate, and clip
with the LED. The lens also has a
large round flange to provide a
long creepage path for any ESD
events that occur at the opening
of the base plate (see Figure 4).
The HDNS-2200 clip holds the
LED in relation to the lens. The
LED must be inserted into the
clip and the LED’s leads formed
prior to loading on the PCB. The
clip interlocks the sensor to the
lens, and through the lens to the
alignment features on the base
plate.
The HLMP-ED80-XXXXX LED is
recommended for illumination. If
used with the bin table, sufficient
illumination can be guaranteed.
1.27
(0.050)
2.32
(0.091)
40.53
(1.596)
39.39
(1.551)
30.32
(1.194)
∅
3.50
(1.38)
5.10
(0.201)
12.60
(0.498)
11.38
(0.448)
13.88
(0.546)
0 REF.
1.28
(0.050)
CLEAR ZONE
0 REF.
∅
0.80 RECOMMENDED (16 PLACES)
(0.031)
7.50
(0.295)
1.22
(0.048)
DIMENSIONS IN MILLIMETERS (INCHES)
Figure 3. Recommended PCB mechanical cutouts and spacing (top view).
TOP VIEW
44.29
(1.744)
+x
19.10
(0.752)
+y
BASE PLATE
ESD LENS RING
SIDE VIEW
PLASTIC SPRING
CLIP
14.58
(0.574)
13.82
(0.544)
10.58
(0.417)
7.45
(0.293)
PCB
SENSOR
BASE PLATE
ALIGNMENT POST
DIMENSIONS IN MILLIMETERS (INCHES).
Figure 4. 2D assembly drawing of ADNS-2051 (top and side view).
3
HDNS-2200 (CLIP)
HLMP-ED80-XXXXX (LED)
ADNS-2051 (SENSOR)
CUSTOMER SUPPLIED PCB
HDNS-2100 (LENS)
CUSTOMER SUPPLIED BASE PLATE
WITH RECOMMENDED ALIGNMENT
FEATURES PER IGES DRAWING
Figure 5. Exploded view drawing.
PCB Assembly Considerations
1. Insert the sensor and all
other electrical components
into PCB.
2. Bend the LED leads 90° and
then insert the LED into the
assembly clip until the snap
feature locks the LED base.
3. Insert the LED/clip assembly
into PCB.
4. Wave Solder the entire as-
sembly in a no-wash solder
process utilizing solder fix-
ture. The solder fixture is
needed to protect the sensor
during the solder process.
The fixture should be de-
signed to expose the sensor
leads to solder while shield-
ing the optical aperture from
direct solder contact. The
solder fixture is also used to
set the reference height of
the sensor to the PCB top
during wave soldering (Note:
DO NOT remove the kapton
tape during wave soldering).
5. Place the lens onto the base
plate.
6. Remove the protective
kapton tape from optical
aperture of the sensor. Care
must be taken to keep con-
taminants from entering the
aperture. It is recommended
not to place the PCB facing
up during the entire mouse
assembly process. The PCB
should be held vertically
during the kapton removal
process.
7. Insert PCB assembly over the
lens onto the base plate align-
ing post to retain PCB assem-
bly. The sensor aperture ring
should self-align to the lens.
8. The optical position refer-
ence for the PCB is set by the
base plate and lens. Note that
the PCB motion due to button
presses must be minimized to
maintain optical alignment.
9. Install mouse top case. There
MUST be a feature in the top
case to press down onto the
clip to ensure all components
are interlocked to the correct
vertical height.
4
SCLK
SERIAL PORT
SDIO
XA
QUADRATURE
OUTPUT
OSC_IN
SERIAL PORT
OSCILLATOR
OSC_OUT
REFA
VOLTAGE REGULATOR
AND POWER CONTROL
RESONATOR
POWER ON
RESET
XB
QUADRATURE
OUTPUTS
YA
YB
R_BIN
LED
XY_LED
REFB
PD
V
DD
GND
GND
VOLTAGE
REFERENCE
IMAGE
PROCESSOR
LED
DRIVE
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
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.
For improved ESD performance,
the lens flange can be sealed (i.e.
glued) to the base plate. Note that
the lens material is polycarbonate
SENSOR
CLIP
LED
PCB
LENS/LIGHT PIPE
BASE PLATE
SURFACE
Figure 7. PCB assembly.
5
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