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ADNS-3550 Schematic ( PDF Datasheet ) - Avago

Teilenummer ADNS-3550
Beschreibung Low Power LED Integrated Slim Mouse Sensor
Hersteller Avago
Logo Avago Logo 




Gesamt 26 Seiten
ADNS-3550 Datasheet, Funktion
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.
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.
Features
  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
  Optical mice
  Optical trackballs
  Integrated input devices
  Battery-powered input device






ADNS-3550 Datasheet, Funktion
PCB Assembly Considerations
1. Surface mount the sensor and all other electrical com-
ponents into PCB.
2. Reflow the entire assembly in a no-wash solder
process.
3. Place the lens onto the base plate. Care must be taken
to avoid contaminating or staining the lens.
4. Remove the protective kapton tape from optical
aperture of the sensor and LED. Care must be taken
to keep contaminants from entering the aperture.
Recommend not to place the PCB facing up during the
entire mouse assembly process. Recommend to hold
the PCB first vertically for the kapton removal process.
5. Insert PCB assembly over the lens onto the base plate
aligning post to retain PCB assembly. The lens piece
has alignment posts which will mate with the align-
ment holes on the sensor aperture.
6. 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.
7. Install mouse top case. There MUST be a feature in the
top case to press down onto the sensor to ensure the
sensor and lens components are interlocked to the
correct vertical height.
Design Considerations for Improved ESD Performance
For improved electrostatic discharge performance,
typical creepage and clearance distance are shown in
the table below. Assumption: base plate construction
as per the Avago Technologies supplied IGES file and
ADNS-3150-001 lens.
Typical Distance
Creepage
Clearance
Millimeters
0.6
2.76
Note that the lens material is polycarbonate and there-
fore, cyanoacrylate-based adhesives or other adhesives
that may damage the lens should NOT be used.
BOTTOM OF PCB TO
BOTTOM MATING
SURFACE OF LENS
2.28
(0.09)
CUSTOMER'S PCB
SENSOR
CUSTOMER'S
BASE PLATE
BOTTOM OF PCB TO 3.25
NAVIGATION SURFACE (0.13)
0.29
(0.01)
LENS
BOTTOM OF LENS
TO NAVIGATION SURFACE
Figure 6a. Sectional view of PCB assembly
(bottom mount)
CUSTOMER'S PCB
LED DIE
CUSTOMER'S BASE PLATE
NAVIGATION
SURFACE
2.50 DIE TO NAVI
(0.10) SURFACE
0.97
(0.04)
BOTTOM MATING SURFACE
OF LENS TO NAVIGATION SUR
SENSOR DIE
SENSOR PCB
LENS
Figure 6b. Sectional view of PCB assembly
(top mount)

NAVIGATION
SURFACE

6 Page









ADNS-3550 pdf, datenblatt
Power Management Modes
The ADNS-3550 has three power-saving modes. Each
mode has a different motion detection period, affecting
response time to mouse motion (Response Time). The
sensor automatically changes to the appropriate mode,
depending on the time since the last reported motion
(Downshift Time). The parameters of each mode are
shown in the following table.
Mode
Rest 1
Rest 2
Rest 3
Response Time (Nominal)
16.5 ms
82 ms
410 ms
Downshift Time
(Nominal)
237 ms
8.4 s
504 s
may be shared with other SPI slave devices. When the
NCS pin is high, the inputs are ignored and the output
is tri-stated.
The lines that comprise the SPI port:
SCLK: Clock input. It is always generated by the
master (the microcontroller).
MOSI: Input data. (Master Out/Slave In).
MISO: Output data. (Master In/Slave Out).
NCS: Chip select input (active low). NCS needs to
be low to activate the serial port; otherwise,
MISO will be high Z, and MOSI & SCLK will be
ignored. NCS can also be used to reset the
serial port in case of an error.
Chip Select Operation
Motion Pin Timing
The motion pin is a level-sensitive output that signals
the microcontroller when motion has occurred. The
motion pin is lowered whenever the motion bit is set;
in other words, whenever there is data in the Delta_X
or Delta_Y registers. Clearing the motion bit (by reading
Delta_Y and Delta_X, or writing to the Motion register)
will put the motion pin high.
LED Mode
For power savings, the LED will not be continuously on.
ADNS-3550 will flash the LED only when needed.
The serial port is activated after NCS goes low. If NCS
is raised during a transaction, the entire transaction is
aborted and the serial port will be reset. This is true for all
transactions. After a transaction is aborted, the normal
address-to-data or transaction-to-transaction delay is
still required before beginning the next transaction. To
improve communication reliability, all serial transac-
tions should be framed by NCS. In other words, the port
should not remain enabled during periods of non-use
because ESD and EFT/B events could be interpreted as
serial communication and put the chip into an unknown
state. In addition, NCS must be raised after each burst-
mode transaction is complete to terminate burst-mode.
The port is not available for further use until burst-mode
is terminated.
Synchronous Serial Port
The synchronous serial port is used to set and read pa-
rameters in the ADNS-3550, and to read out the motion
information.
The port is a four wire serial port. The host microcon-
troller always initiates communication; the ADNS-3550
never initiates data transfers. SCLK, MOSI, and NCS may
be driven directly by a microcontroller. The port pins
Write Operation
Write operation, defined as data going from the micro-
controller to the ADNS-3550, is always initiated by the
microcontroller and consists of two bytes. The first byte
contains the address (seven bits) and has a “1” as its MSB
to indicate data direction. The second byte contains the
data. The ADNS-3550 reads MOSI on rising edges of
SCLK.
12

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