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 mathemati-
cally determining 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-XX000
(639 nm LED illuminator source). There are no moving
parts, and precision optical alignment is not required, fa-
cilitating 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 programmed to 800 cpi.
The part is programmed via a two wire serial port,
through registers.
Features
•
Precise optical navigation technology
•
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)
Theory of Operation
The ADNS-2051 is based on Optical Navigation Tech-
nology. 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-XX000 LED. These images are
processed by the DSP to determine the direction and
distance of motion. The DSP generates the Δx and Δy
relative displacement values that are converted into two
channel quadrature signals.
Applications
•
Mice for desktop PCs, workstations, and portable PCs
•
Trackballs
•
Integrated input devices
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
REFB
8
XB
YB
YA
XY_LED
REFA
3
13
4
12
5
11
6
10
7
9
OSC_IN
GND
OSC_OUT
GND
V
DD
16
SCLK
XA
1
2
SDIO
PD
R_BIN
A2051
XYYWWZ
15
14
2
PIN 1
A2051
XYYWWZ
12.85 (AT SHOULDER)
(0.506)
22.30
(0.878)
50°
±
0.5°
9.10
(0.358)
0.01
(0.000)
*
0.99
(0.039)
2.98
(0.117)
*
3.18
(0.125)
5.16
(0.203)
0.50 CHAMFER
LEAD WIDTH 0.50
(0.020)
0.25
(0.010)
1.26 LEAD OFFSET
(0.050)
2.54 LEAD PITCH
(0.100)
*
6.18
(0.243)
0.25
(0.010)
5°
±
3°
13.57
±
0.45 (AT LEAD TIP)
(0.534
±
0.018)
GATE LOCATION
SURFACE RECESSED
BY 0.3 mm
4.55
(0.179)
6.03
(0.237)
PROTECTIVE KAPTON TAPE
∅
5.00
(MEASURED AT BASE) 5.60
±
0.03
(0.220
±
0.001)
GROOVE
7.28
±
0.03
(0.287
±
0.001)
0.06
(0.002)
*
1.85
±
0.03
(0.073
±
0.001)
A
PIN 1
∅
0.80
±
0.03
CLEAR OPTICAL PATH
13.38
(0.527)
A
*
1.5° DRAFT
SECTION A-A
1.43
±
0.03
(0.056
±
0.001)
2.80
(0.110)
*
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.
9.
*
THESE DIMENSIONS ARE FOR REFERENCES ONLY AND SHOULD NOT BE USED TO MECHANICALLY REFERENCE THE SENSOR.
Figure 2. Package outline drawing
3
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-XX000.
Avago 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-XX000 LED is recom-
mended for illumination. If used with
the bin table, sufficient illumination
can be guaranteed.
12.60
(0.498)
11.38
(0.448)
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)
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)
ADNS-2051 fig 3
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)
10.58
(0.417)
7.45
(0.293)
PCB
13.82
(0.544)
SENSOR
BASE PLATE
ALIGNMENT POST
DIMENSIONS IN MILLIMETERS (INCHES).
Figure 4. 2D assembly drawing of ADNS-2051 (top and side view)
ADNS-2051 fig 4
4
HDNS-2200 (CLIP)
HLMP-ED80 (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
ADNS-2051 fig 5
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 assembly in a no-wash solder
process utilizing solder fixture. The solder fixture
is needed to protect the sensor during the solder
process. The fixture should be designed to expose
the sensor leads to solder while shielding 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
contaminants from entering the aperture. It is recom-
mended 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
aligning post to retain PCB assembly. The sensor
aperture ring should self-align to the lens.
8. The optical position reference 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 com-
ponents are interlocked to the correct vertical height.
5
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