ADNS-3550
Low Power LED Integrated Slim Mouse Sensor
Data Sheet
Description
The ADNS-3550 LED optical mouse sensor is a small form
factor (SFF) LED illuminated navigation system.
The ADNS-3550 is a low-power optical navigation
sensor. It has a new, low-power architecture and auto-
matic power management modes, making it ideal for
battery-and power-sensitive applications such as cord-
less input devices.
The ADNS-3550 is capable of high-speed motion detec-
tion — up to 20 ips and 8g. In addition, it has an on-
chip oscillator and integrated LED to minimize external
components.
The ADNS-3550, along with the ADNS-3150-001 lens,
form a complete and compact mouse tracking system.
There are no moving parts which means 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 a four-
wire serial port. It is packaged in a 16 I/O surface mount-
able package.
Features
•
•
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•
•
•
•
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Low power architecture
Small form factor
Surface mount technology (SMT) device
Self-adjusting power-saving modes for longest
battery life
High speed motion detection up to 20 ips and 8g
Self-adjusting frame rate for optimum performance
Motion detect pin output
Internal oscillator — no clock input needed
Selectable 500 and 1000 cpi resolution
Wide operating voltage: 2.7 V - 3.6 V nominal
Four wire serial port
Minimal number of passive components
Integrated chip-on-board LED
Applications
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•
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Optical mice
Optical trackballs
Integrated input devices
Battery-powered input device
Theory of Operation
The ADNS-3550 is based on Optical Navigation Technol-
ogy, which measures changes in position by optically
acquiring sequential surface images (frames) and math-
ematically determining the direction and magnitude of
movement.
The ADNS-3550 contains an Image Acquisition System
(IAS), a Digital Signal Processor (DSP), and a four wire
serial port.
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
Dx
and
Dy
relative dis-
placement values.
An external microcontroller reads the
Dx
and
Dy
infor-
mation from the sensor serial port. The microcontroller
then translates the data into PS2, USB, or RF signals
before sending them to the host PC or game console.
Pinout of ADNS-3550 Optical Mouse Sensor
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
MISO
SCLK
MOSI
MOTION
XY_LED
LED_GND
SHTDWN
LED (+)
LED (-)
AVDD
GND
GND
AGND
VDD
GND
NCS
Description
Serial Data Output (Master In/Slave
Out)
Serial Clock Input
Serial Data Input (Master Out/Slave In)
Motion Detect (Active Low Output)
LED Control
Ground for LED Current
Shutdown (Active High Input)
LED Positive Terminal
LED Negative Terminal
Analog Supply Voltage
Ground
Ground
Analog Ground
Supply Voltage
Ground
Chip Select (Active Low Input)
LED (-) 9
AVDD 10
GND 11
GND 12
AGND 13
VDD 14
GND 15
NCS 16
8 LED (+)
7 SHTDWN
6 LED-GND
5 XY-LED
4 MOTION
3 MOSI
2 SCLK
1 MISO
LED (+) 8
SHTDWN 7
LED-GND 6
XY-LED 5
MOTION 4
MOSI 3
SCLK 2
MISO 1
9 LED (-)
10 AVDD
11 GND
12 GND
13 AGND
14 VDD
15 GND
16 NCS
Figure 1a. Package outline drawing (top view)
Figure 1b. Package outline drawing (bottom view)
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12.90 ± 0.20
(0.508 ± 0.008)
1.00
1.60
(0.039) (0.063)
PAD #1
6.25
(0.246)
12.50 ± 0.20 C
(0.492 ± 0.008) L
0.80
(0.031)
11.30
(0.445)
16X
∅
0.50 PTH
(0.020)
0.50
(0.020)
NOTES:
1. DIMENSIONS IN MILLIMETERS (INCHES).
2. COPLANARITY OF PADS: ± 0.1 mm
3. CUMULATIVE PITCH TOLERANCE: ± 0.15 mm
4. PAD PITCH TOLERANCE: ± 0.1 mm
5. MAXIMUM FLASH: + 0.2 mm
6. DIMENSIONAL TOLERANCE (UNLESS OTHERW
STATED): ± 0.15 mm
1.19
(0.047)
PROTECTIVE
KAPTON TAPE
0.80
(0.031)
1.00
(0.039)
GUIDE HOLE B
OPTICAL CENTER
5.65
(0.222)
C
L
GUIDE HOLE A
3.41
(0.134)
5.89
(0.232)
10.35
(0.408)
PAD #1
2.80
(0.110)
5.60
(0.220)
Figure 2. Package outline drawing
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.
3
Overview of Optical Mouse Sensor Assembly
Avago Technologies provides an IGES file drawing de-
scribing the base plate molding features for lens and
PCB alignment.
The components interlock as they are mounted onto
defined features on the base plate.
0.53
(0.21)
1.60 (x 14)
(0.063)
12.55
(0.494)
5.89
(0.232)
0
1.35
(0.053)
0.53
(0.21)
The ADNS-3550 sensor is designed for surface mounting
on a PCB, looking down. There is an aperture stop and
features on the package that align to the lens.
The ADNS-3150-001 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 and base plate.
PAD #1
0.45
(0.18)
OPTICAL
CENTER
0
0.75
(0.030)
0.45
(0.18)
5.65
(0.222)
RECTANGULAR
CUTOUT
10.55
(0.415)
11.30
(0.445)
Figure 3. Recommended customer PCB PADOUT and spacing
CUSTOMER PCB
ADNS-3550
Figure 3. Recommended customer’s PCB PADOUT and spacing
ADNS-3150-001
MOUSE BOTTOM COVER
Figure 4a. 2D assembly drawing of ADNS-3550
(mounted on the bottom side of customer PCB)
ADNS-3550
CUSTOMER PCB
ADNS-3150-001
MOUSE BOTTOM COVER
Figure 4b. 2D assembly drawing of ADNS-3550
(mounted on the top side of customer PCB)
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