ADNK-7553-SP11 Avago Technologies US Inc., ADNK-7553-SP11 Datasheet - Page 3

• Manufacturer Part Number: ADNK-7553-SP11
• Description: Reference Design Kit For ADNS-7550
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNK-7553-SP11

• Main Purpose: Reference Design, Optical Mouse
• Utilized Ic / Part: ADNS-7550
• Description/function: Optical Mouse Sensor Kit
• Interface Type: USB
• Product: Display Modules
• Touch Panel: No Touch Panel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Details
• For Use With/related Products: SPCP868A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

This motion information will be reported to the PC to
update the position of the cursor. The advantages of
using ADNS-7550 optical sensor are the best tracking
accuracy, flexibility of programming the optical sensor
via the SPI port, and the automatic frame rate feature.
Besides, ADNS-7550 optical sensor performs excellent
tracking on difficult surfaces which conventional LED
based technology is unable to track such as glossy and
smooth surfaces. The speed improvement is achieved by
continuous data clocking to or from multiple registers.
Motion Read is activated by reading the Motion_Burst
register. The ADNS-7550 will respond with the contents
of the Motion, Delta_X_L, Delta_Y_L, Delta_XY_H, SQUAL,
Shutter_Upper, Shutter_Lower and Maximum_Pixel
registers in that order.
The ADNS-7550 sensor, along with the ADNS-6150,
ADNS-6160-001 or ADNS-6170-002 lens form a complete
and compact laser mouse tracking system. There are no
moving parts, which mean high reliability and less main-
tenance for the end user. In addition, precision optical
alignment is not required, facilitating high volume
assembly.
Mechanical Z-Wheel
The motion of Z-wheel is detected using the traditional
method by decoding the quadrature signal generated by
mechanical encoder. The Z-pinwheel is connected to the
Z-encoder through its shaft. The rotational movement of
the shaft is decoded into on and off levels in a quadrature
output pattern. Every change in the Z-encoder outputs
represents a count of mouse movement. Comparing the
last state of the Z-encoder to the current state derives
direction information. In this reference design, only the
motion at the Z-wheel is detected using this method.
Mouse Buttons
Mouse buttons are connected as standard switches. These
switches are pulled up by the pull up resistors inside the
microcontroller. When the user presses a button, the
switch will be closed and the pin will be pulled
LOW to GND. A LOW state at the pin is interpreted as
the button being pressed. A HIGH state is interpreted
as the button has been released or the button is not
being pressed. Normally the switches are debounced in
firmware for 15-20ms. In this reference design there are
three switches: left Z-wheel and right.

USB Connection
The Sunplus SPCP868A has a configuration register that
switches control from the SIE to manual control on the
D+ and D- pins. This allows the firmware to dynamically
configure itself to operate as a USB mouse. The firmware
for this reference design will automatically detect the
host topology (USB). The connections for the connectors
are shown in Figure 2 below.
USB type-A Connector
Figure 2. USB peripheral connectors
Some details on ADNK-7553-SP11
The ADNK-7553-SP11 reference design mouse unit allows
users to evaluate the performance of the Optical Tracking
Engine (sensor, lens) over a USB connection. This kit also
enables users to understand the recommended mechani-
cal assembly. (See Appendix C, D, and E)
System Requirements
PCs using Windows®95, Windows®98, Windows®NT,
Windows®2000, Windows®XP or Windows®Vista with
standard 3-button USB mouse driver loaded.
Functionality
3-button, scroll wheel USB-mouse.
USB Operating Mode
Hot pluggable with USB port. The PC does not need to be
powered off when plugging or unplugging the evalua-
tion mouse.