tomatically validate the packets adress and CRC, further

reducing the microcontrollers processing tasks.

The Cypress CY7C63231A enCoRe

 is a revolutionary

chip that integrates numerous common components,

including breakthrough crystal-less oscillator. The re-

sult is an overall reduction in board components and

reduced system cost. The EPROM based microcontroller

allows easy firmware modification, as well as storage

of Vendor and Product ID

s without an external EE-

PROM.

This kit is connectable to a PC via the USB port. It is

based on the 2.4GHz RF technology, the data gener-

ated from displacement detection / button status in

the laser mouse is encoded with a pre-defined serial

type protocol handled by firmware in the MCU. In the

RF stage, the encoded data is used for GFSK modula-

tion. The captured data from the RF receiver stage is

decoded with a corresponding packet format used for

mouse applications. The final data is sent to the host

through the USB interface.

Figure 1. Sectional view of PCB assembly highlighting all optical mouse components

(optical mouse sensor, clip, lens, LASER, PCB, and base plate).

The Texas Instruments MSP430F1222 is the ultra low-

power mixed signal microcontroller with a built-in

16-bit timer, 10-bit A/D converter with integrated refer-

ence and data transfer controller (DTC) and twenty-two

I/O pins. In addition, the MSP430F1222 microcontroller

has built-in communication capability using asyn-

chronous (UART) and synchronous (SPI) protocols. The

architecture, combined with five low power modes is

optimized to achieve extended battery life on wireless

application.

The Nordic nRF2402 and nRF2401A are the low power

single-chip radio transmitter and transceiver for the

world wide 2.4 - 2.5 GHz ISM band. The entire transmit-

ter and transceiver including all inductors and filters

are integrated in each single chip respectively which

gives the lowest cost solution to the end user. All con-

figurations of the nRF2402 transmitter and nRF2401A

transceiver are done via a standard serial interface. The

nRF devices include the ShockBurst engine which allow

for high datarates on air using low datarates between

the microcontroller and the nRF device, it will also au-

SENSOR

VSCEL

PCB

BASE

PLATE

LENS

SURFACE

VSCEL

CLIP

PCB