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Version 1.40 |12 Aug 2016 | 31005AEN

PixArt Imaging Inc. http://www.pixart.com

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PixArt Imaging Inc.

PMW3325DB-TWV1 General Datasheet

Optical Gaming Navigation Chip

Introduction

1.1

Overview

PMW3325DB-TWV1 is based on Optical Navigation Technology, which measures changes in position by optically acquiring

sequential surface images (frames) and mathematically determining the direction and magnitude of movement.

PMW3325DB-TWV1 contains an Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a three-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 ΔX and ΔY relative displacement values. An

external microcontroller reads and translates the ΔX and ΔY information from the chip serial port into PS2, USB, or RF signals

before sending them to the host PC.

Note: Throughout this document PMW3325DB-TWV1 is referred to as the PMW3325DB.

Figure 1. Functional Block Diagram

1.2

Terminology

Term

Description

DSP

Digital Signal Processing

LED

Light Emitting Diode

NCS

Chip Select

VDDPIX

Internal Regulator Output

VDD

Supply voltage

SCLK

Serial Clock

SDIO

Serial Data In & Out

SPI

Serial Peripheral Interface

GND

Ground

PMW3325DB-TWV1

OSCILLATOR

DSP

VDD

GND

LED

SCLK

NCS

VDDPIX

SDIO

VDDIO