Leadtek LR9548S User manual

LR9548S
GPS Module
LR9548S
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.
Trademarks
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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.
Customer Support
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For support via e-mail, submit your question at [email protected].
Leadtek Research Inc. 18F, 166, Chien-Yi Rd., Chung Ho, Taipei Hsien, Taiwan (235)
Telephone: [phone]
Fax: [phone]
[email protected]
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Leadtek Research USA 910 Auburn Ct. Fremont, CA 94538, USA
Telephone: [phone]
Fax: [phone]
[email protected]

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Contents
FEATURES.....................................................................................................................................1
HARDWARE AND SOFTWARE .........................................................................................................1
PERFORMANCE ..............................................................................................................................2
INTERFACE ....................................................................................................................................2
ADVANTAGES..............................................................................................................................2
SPECIFICATIONS........................................................................................................................3
TECHNICAL SPECIFICATIONS .........................................................................................................3
ENVIRONMENTAL CHARACTERISTICS............................................................................................4
PHYSICAL CHARACTERISTICS........................................................................................................4
INTERFACE SPECIFICATIONS..........................................................................................................4
REFERENCE DESIGN ......................................................................................................................5
SOFTWARE ....................................................................................................................................6
ELECTRICAL SPECIFICATIONS.............................................................................................7
BLOCK DIAGRAM ..........................................................................................................................7
INTERFACE SPECIFICATION..................................................................................................7
PHOTOS AND PIN POSITIONS..........................................................................................................7
PIN SETTINGS ................................................................................................................................8
MECHANICAL DIMENSIONS...................................................................................................9
OUTLINE DRAWING .......................................................................................................................9
(Bottom view) .........................................................................................................................10
RECOMMENDED FOOTPRINT..............................................................................................11
AUTOMATED MANUFACTURING COMPONENTS..........................................................12
REEL TAPING SPECIFICATION......................................................................................................12
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

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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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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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Specifications
Technical Specifications
Feature Item Description
Chipset GSC3f SiRFstarIII single chip
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
General
Channels 20
10 meters, 2D RMS
5 meters 2D RMS, WAAS corrected
Position
<5meters(50%), DGPS corrected
Velocity 0.1 meters/second
Accuracy
Time 1 microsecond synchronized to GPS time
Default WGS-84
Datum
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
Time to First Fix
(TTFF)
(Open Sky &
Stationary
Requirements) 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.
Dynamic
Conditions
Jerk 20 meters/second3, max.
Main power input 3.2 ~ 5.0 VDC input
Power consumption ≈230 mW (continuous mode)
Supply Current ≈70 mA
Power
Backup Power 1.65 ~ 5.0 VDC input.
Electrical interface Two full duplex serial TTL interface.
Serial Port
Protocol messages NMEA-0183@4800 bps (Default)
Level TTL
Pulse duration 1 µs
Time reference At the pulse positive edge.
Time-1PPS
Pulse
Measurement Aligned to GPS second, ±1 microsecond

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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 24 mm ±0.1mm (0.94in)
Width 20 mm ±0.1mm (0.79 in)
Height 2.9 mm ±0.1mm (0.11 in)
Weight 2.5g
Interface Specifications
Items Description
I/O 28 pin SMD micro package

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

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Software
The firmware used on Leadtek LR9548S module is GSW3.2.0, the SiRF standard GPS software for
SiRFstarIII receivers. Features include:
Excellent sensitivity
High configurability
1 Hz position update rate
Supports use of satellite-based augmentation systems like the US WAAS or European EGNOS
system(Option)
Real-time Operating System (RTOS) friendly
Capable of outputting either NMEA(default) or SiRF proprietary binary protocols
Designed to accept custom user tasks executed on the integrated ARM7TDM1 processor(Option)
Runs in full power operation(default) or optional power saving modes
Default configuration is as follows:
Item Description
Core of firmware SiRF GSW3.2.0
Baud rate 4800, 9600, 19200, 38400 or 57600 bps (default 4800)
Code type NMEA-0183 ASCII
Datum WGS-84
Protocol message GGA(1sec), GSA(5sec), GSV(5sec), RMC(1sec),VTG(1sec)
Output frequency 1 Hz

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Electrical Specifications
Block Diagram
bandpass
filter
LNA
SiRF GSC3f
16.369MHz
TCXO 32.768KHz Crystal
2.85 VDC
regulator voltage detector 1.50 VDC
regulator
serial
IO
RFIN
9548S Block Diagram
+ power in + backup battery
antenna
power
Antenna
Interface Specification
Photos and Pin Positions
Pin 15
Pin 28
Pin 1 Pin 14
Serial Number
Model Number