ADNK-3043-TI27 Avago Technologies US Inc., ADNK-3043-TI27 Datasheet - Page 4

• Manufacturer Part Number: ADNK-3043-TI27
• Description: WIRELESS MOUSE DESIGN KIT
• Manufacturer: Avago Technologies US Inc.
• Type: Wireless Mouse Development Kitr

Specifications of ADNK-3043-TI27

• Frequency: 2.4GHz
• Description/function: Optical Mouse Sensor Kit
• Interface Type: USB
• Product: Display Modules
• Touch Panel: No Touch Panel
• For Use With/related Products: ADNS-3043
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Microcontroller
The Texas Instruments MSP430 family of ultra-low power
microcontrollers consists of several devices featuring
different sets of peripherals targeted for various applica-
tions. The architecture, combined with five low-power
modes, is optimized to achieve extended battery life in
portable measurement applications. The device features
a powerful 16-bit RISC CPU, 16-bit registers, and constant
generators that attribute to maximum code efficiency. The
Digitally Controlled Oscillator (DCO) allows wake-up from
low-power modes to active mode in less than 6 µsec.
The specific device used in this reference design is the
MSP430F1222 with 28 pin to accommodate ample amount
of I/O. It is an ultra-low power mixed-signal microcon-
trollers with a built-in 16-bit timer, 10-bit A/D converter
with integrated reference and Data Transfer Controller
(DTC), and 14 (20 pin package) or 22 (28 pin package)
general purpose I/O pins. The MSP430x12x2 series micro-
controllers have built-in communication capability using
asynchronous (UART) and synchronous (SPI) protocols.
Serial Peripheral Interface (SPI)
The MSP430F1222 provides a dedicated hardware-based
Serial Peripheral Interface (SPI). The three-wire interface
supports byte serial communication in either Master or
Slave mode. In this reference design the MSP430F1222
always acts as the master and initiates all SPI communica-
tions with external SPI device(s), in this case the ADNS-
3040.
Z Wheel Quadrature Encoder
A standard two-channel, incremental optical quadrature
encoder and an IR LED provide the scroll wheel function.
The MSP430F1222 manages the IR LED directly. Since
achieving low-power consumption is one of the main ob-
jectives, the Z-wheel LED is only enabled when the MSP430
needs to read the output states of the optical quadrature
encoder to the MSP430 port pins while in ACTIVE mode.
The Z-wheel LED is pulsed on for approximately 40 µsec
every 2 msec while in ACTIVE mode to read the current
position of the scroll wheel, thus saving power since the
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Z-wheel LED is only on for a duty cycle of 2%. The outputs
of the two-channel quadrature encoder are squarewaves
that are 90° out of phase. The phase relationship of these
signals encodes the directions of scroll wheel rotations.
Within the MSP430, an internal Quadrature Encoder Pulse
(QEP) state machine interprets these signals and incre-
ments or decrements a counter based on the direction and
movement of the scroll wheel.
Wireless RF Technology
In order to provide the maximum flexibility the reference
design mouse utilizes two circuit boards. The main
board consists of the ADNS-3040 navigation sensor/LED,
the MSP430F1222 microcontroller, the scroll wheel
LED/encoder and the button switches. A 10-pin header
connects the RF daughter card to the main board. The
27 MHz FSK transmitter circuit is based on a previously
published reference design.
Some details on ADNK-3043-TI27
The ADNK-3043-TI27 reference design kit allows users to
evaluate the performance of the Optical Tracking Engine
(sensor, lens, LED assembly clip, LED) over a 27 MHz RF
connection. This kit also enables users to understand the
recommended mechanical assembly. (See Appendix C, D
and E)
System Requirements
PCs using Windows 95/ Windows 98/ Windows NT/
Windows 2000 with standard 3-button USB mouse driver
loaded.
Functionality
27 MHz wireless USB, 3-button, scroll wheel, 800 cpi
USB Operating Mode
The receiver dongle is hot pluggable into the USB port. The
PC does not need to be powered off when plugging or un-
plugging the receiver dongle for the evaluation mouse.