2

TheoryofOperation

NavigationTechnology

The heart of the ADNS-3040 navigation sensor is a CMOS image

array. An LED and an optical system illuminate the surface that

the ADNS-3040 is navigating on. The texture of the surface

casts bright and dark spots forming distinct images as the

sensor is moved across the surface. A Digital Signal Processing

(DSP) engine and its built-in algorithm evaluate these images

and determine the magnitude and direction of the movement.

Lens

Image

Array

LED

Lens

Surface

Shadow pattern

Figure 1. ADNK-3034-TI27 Reference Design Mouse functional Block Diagram

RF Board

Left Button

Avago

ADNS-3040

Optical Mouse Sensor

Wheel Button

Right Button

Z Optics

TI

MSP430F1222

Microcontroller

MISO

MOSI

SCLK

NCS

Control

and Data

MAX1722

Boost Regulator

Quadrature

Signals

The motion data is made available in the delta_X and delta_Y

registers for the system controller to retrieve. An extensive

power saving topology is implemented within the ADNS-3040

navigation engine. A Motion pin (output) is available to act as

the system interrupt. As long as there is no motion the system

can remain in Sleep mode allowing maximum battery power

saving. Based on the last detected motion the ADNS-3040

navigation engine enters various power saving modes when

no new motion occurs. These power saving features make the

ADNS-3040 ideally for wireless applications.

Figure 2. Illustration of Optical Navigation technology