QLEADTEK LR9548S User Manual

LR9548S

LR9548S

GPS Module

GPS Module

Copyright

©2006 Leadtek Research Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval
system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise,
without the prior written consent of Leadtek Research Inc.

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Leadtek and the Leadtek logo are registered trademarks of Leadtek Research Inc.

All other trademarks are the property of their respective owners.

Changes

The material in this document is for information only and is subject to change without notice. While reasonable efforts
have been made in the preparation of this document to assure its accuracy, Leadtek Research assumes no liability
resulting from errors or omissions in this document, or from the use of the information contained herein.

Leadtek reserves the right to make changes in the product design without reservation and without notification to its
users.

THE DOCUMENT IS PROVIDED BY LEADTEK "AS IS", AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LEADTEK BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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POSSIBILITY OF SUCH DAMAGE.

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Contents

FEATURES.....................................................................................................................................1

ARDWARE AND SOFTWARE .........................................................................................................1

H

ERFORMANCE ..............................................................................................................................2

P

NTERFACE ....................................................................................................................................2

I

ADVANTAGES..............................................................................................................................2

SPECIFICATIONS........................................................................................................................3

ECHNICAL SPECIFICATIONS .........................................................................................................3

T

NVIRONMENTAL CHARACTERISTICS............................................................................................4

E

HYSICAL CHARACTERISTICS ........................................................................................................4

P

NTERFACE SPECIFICATIONS ..........................................................................................................4

I

EFERENCE DESIGN ......................................................................................................................5

R

OFTWARE ....................................................................................................................................6

S

ELECTRICAL SPECIFICATIONS.............................................................................................7

B

LOCK DIAGRAM ..........................................................................................................................7

INTERFACE SPECIFICATION..................................................................................................7

P

HOTOS AND PIN POSITIONS..........................................................................................................7

IN SETTINGS ................................................................................................................................8

P

MECHANICAL DIMENSIONS................................................... ... .............................................9

O

UTLINE DRAWING .......................................................................................................................9

(Bottom view) .........................................................................................................................10

RECOMMENDED FOOTPRINT..............................................................................................11

AUTOMATED MANUFACTURING COMPONENTS ..........................................................12

EEL TAPING SPECIFICATION......................................................................................................12

R

Tape Reel Drawing.............................................................. .................................. .................12

Polystyrene Alloy Taping Specifications............................................................................... .13

Polystyrene Alloy Taping Drawing..................................................................................... .. .13

REFLOW PROFILE...................................................................................................................14

ROHS COMPLIANCE................................................................................................................15

ORDERING INFORMATION...................................................................................................15

ORDERING INFORMATION...................................................................................................16

GLOSSARY..................................................................................................................................17

i

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LR9548S GPS Module Technical Manual v1.52

Introduction

The Leadtek LR9548S GPS module is a high sensitivity, low power, Surface Mount Device (SMD).

This 20-channel global positioning system (GPS) receiver is designed for a wide range of OEM

applications and is based on the GPS signal search capabilities of the SiRFstarIII™ single chip

architecture, SiRF’s newest chipset technology. The LR9548S is also pin-to-pin compatible with the

LR9805-III (LR9548) for easier and faster transition.

The LR9548S is designed to allow quick and easy integration into GPS-related applications such as:

PDA, Pocket PC, and other computing devices
Car and Marine Navigation
Fleet Management /Asset Tracking
AVL and Location-Based Services
Hand-Held Device for Personal Positioning and Navigation

Features

Hardware and Software

Based on the high performance features of the SiRFstarIII single chip
Compact module size for easy integration: 24x20x2.9 mm (0.94x0.79x0.11 in).
Fully automatic assembly: reflow solder assembly ready
Hardware compatible with SiRF GSW3.2.0 software
Multiple I/O pins reserved for customizing special user applications
RoHS compliance

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LR9548S GPS Module Technical Manual v1.52

Performance

Cold/Warm/Hot Start Time: 42/38/1 sec. at open sky and stationary environments.
Reacquisition Time: 0.1 second
RF Metal Shield for best performance in noisy environments
Multi-path Mitigation Hardware

Interface

TTL level serial port for GPS communications interface
Protocol: NMEA-0183/SiRF Binary (default NMEA)
Baud Rate: 4800, 9600, 19200, 38400 or 57600 bps (default 4800)

Advantages

Ideal for high volume mass production(Taping reel package)
Cost saving through elimination of RF and board to board digital connectors
Flexible and cost effective hardware design for different application needs
Secure SMD PCB mounting method

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LR9548S GPS Module Technical Manual v1.52

Specifications

Technical Specifications

Feature Item Description

Chipset
General

Accuracy

Datum

Time to First Fix
(TTFF)
(Open Sky &
Stationary
Requirements)
Dynamic
Conditions

Power

Serial Port

Time-1PPS
Pulse

GSC3f SiRFstarIII single chip
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20
Position

Velocity 0.1 meters/second
Time 1 microsecond synchronized to GPS time
Default WGS-84
Other selectable for other Datum
Reacquisition 0.1 sec., average
Snap start 1 sec., average
Hot start 1 sec., average typical TTFF
Warm start 38 sec., average typical TTFF
Cold start 42 sec., average typical TTFF
Altitude 18,000 meters (60,000 feet) max.
Velocity 515 meters/second (1000 knots) max.
Acceleration 4g, max.
Jerk 20 meters/second3, max.
Main power input 3.2 ~ 5.0 VDC input
Power consumption
Supply Current
Backup Power 1.65 ~ 5.0 VDC input.
Electrical interface Two full duplex serial TTL interface.
Protocol messages NMEA-0183@4800 bps (Default)
Level TTL
Pulse duration 1 µs
Time reference At the pulse positive edge.
Measurement

10 meters, 2D RMS
5 meters 2D RMS, WAAS corrected
<5meters(50%), DGPS corrected

≈230 mW (continuous mode)
≈70 mA

Aligned to GPS second, ±1 microsecond

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LR9548S GPS Module Technical Manual v1.52

Environmental Characteristics

Items Description

Operating temperature range -40 deg. C to +85 deg. C
Storage temperature range -55 deg. C to +100 deg. C

Physical Characteristics

Items Description

Length
Width
Height
Weight 2.5g

24 mm ± 0.1mm (0.94in)
20 mm ± 0.1mm (0.79 in)

2.9 mm ± 0.1mm (0.11 in)

Interface Specifications

Items Description

I/O 28 pin SMD micro package

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LR9548S GPS Module Technical Manual v1.52

Reference Design

All ground pads attach directly to ground plane by way of via.
All components are reference only.

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Confidential - Information is subject to change without prior notice.