Leadtek LR9805ST User manual

LR9805-ST
GPS Module
LR9805ST
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
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
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENT, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Customer Support
•Visit our Web site at www.leadtek.com.tw.
•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]
[email protected]m.tw
Leadtek Research USA 910 Auburn Ct. Fremont, CA 94538, USA
Telephone: [phone], ext. 203
Fax: [phone]
[email protected]

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Contents
INTRODUCTION..........................................................................................................................1
FEATURES.....................................................................................................................................1
HARDWARE AND SOFTWARE .........................................................................................................1
PERFORMANCE ..............................................................................................................................1
INTERFACE ....................................................................................................................................2
ADVANTAGES................................................................................................................................2
REFERENCE DESIGN.......................................................................................................................3
SPECIFICATIONS........................................................................................................................4
TECHNICAL SPECIFICATIONS...............................................................................................4
ENVIRONMENTAL CHARACTERISTICS............................................................................................5
PHYSICAL CHARACTERISTICS........................................................................................................5
INTERFACE SPECIFICATIONS..........................................................................................................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 (UNIT :MM ) .................................................................................................9
BOTTOM VIEW (UNIT :MM ) ........................................................................................................10
RECOMMENDED FOOTPRINT (UNIT :MM ) ..................................................................................11
AUTOMATED MANUFACTURING COMPONENTS..........................................................11
REEL TAPING SPECIFICATION......................................................................................................12
Tape Reel Drawing ( Unit: mm )............................................................................................12
Polystyrene Alloy Taping Specifications................................................................................13
Polystyrene Alloy Taping Drawing........................................................................................13
REFLOW PROFILE ...................................................................................................................14
ORDERING INFORMATION...................................................................................................15
GLOSSARY..................................................................................................................................16

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Introduction
The Leadtek LR9805ST GPS module is a high sensitivity, low power, Surface Mount Device (SMD).
This 12-channel global positioning system (GPS) receiver is designed for a broad spectrum of OEM
applications and is based on the fast and deep GPS signal search capabilities of SiRFstarII™ single
chipset. As the single chip version of the LR9805T, The LR9805ST is pin-to-pin compatible with the
LR9805-T for easier and faster transition.
The LR9805ST 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 SiRFstarII single chipset
•Compact module size for easy integration: 24x20x2.9 mm (0.94x0.79x0.11 in)
•Fully automatic assembly: reflow solder assembly ready
•Hardware compatible with SiRFXTrac software
•Multiple I/O pins reserved for customizing special user applications
•RoHS compliance
Performance
•Cold/Warm/Hot Start Time: 45/35/4 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

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

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Specifications
Technical Specifications
Feature Item Description
Chipset GSC2x Series SiRFstarII single chip technology
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
General
Channels 12
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
Hot start 4 sec., average typical TTFF
Warm start 35 sec., average typical TTFF
Time to First Fix (TTFF)
( Open Sky and
Stationary Environment )
Cold start 45 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 3.3 ± 0.3VDC input
Power consumption ≈106 mW (continuous mode)
Supply Current ≈32 mA
Power
Backup Power 1.5 ± 0.1V DC 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 (0.94in)
Width 20 mm (0.79 in)
Height 2.9 mm (0.11 in)
Weight 2.5g
Interface Specifications
Items Description
I/O 28 pin SMD micro package

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Software
The Leadtek LR9805ST module includes SiRFXTrac high sensitivity software solution.
Features include:
•High tracking sensitivity (-154 dBm)
•High configurability
•1 Hz position update rate
•Real-time Operating System (RTOS) friendly
•Capable of outputting both NMEA and SiRF-proprietary binary protocols
•Designed to accept custom user tasks executed on the integrated ARM7TDM1 processor
•Runs in full power operation or optional power saving modes
SiRFXTrac default configuration is as follows:
Item Description
Core of firmware SiRFXTrac
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
Interface Specification
Photos and Pin Positions
Pin 15
Pin 28
Pin 1 Pin 14
Serial
Model

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Pin Settings
PIN Name Type Description
1 REV I Reserved
2 GPIO6 I/O Reserved
3 GPIO10 I/O Reserved
4 RXDB I TTL UART Port B input. If not used, keep floating
5 RXDA I TTL UART Port A input
6 TXDA O TTL UART Port A output
7 GPIO5 I/O Reserved
8 TIMEMARK O 1 PPS timemark output
9 GPIO7 I/O Reserved
10 GPIO11 I/O Reserved
11 GPIO0 I/O Reserved
12 GPIO1 I/O Reserved
13 GPIO12 I/O Reserved
14 GND PWR Ground
15 VCC_IN PWR 3.3V supply input
16 VSTBY PWR Apply 1.5V DC for backup RTC & SRAM. If not used, keep
floating
17 BOOTSEL1 I Pull high for programming mode. If not used, keep floating
18 PBRESN I Reset pin, active low, If not used, keep floating
19 GPIO13 I/O Reserved
20 GND PWR Ground
21 GPIO2 I/O Reserved
22 GPIO3 I/O Reserved
23 TXDB O TTL UART Port B output. If not used, keep floating
24 BOOTSEL0 I Pull low for programming mode. If not used, keep floating
25 ANTPWR PWR Antenna power input
26 GND PWR Ground
27 RFIN I RF Signal input
28 GND PWR Ground

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Mechanical Dimensions
Outline Drawing Tolerance:
Length 24.0 ± 0.4 mm
Width 20.0 ± 0.1 mm
Height 2.90 ± 0.1 mm

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Bottom view ( unit : mm )

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Recommended Footprint ( Unit : mm )
Automated Manufacturing Components

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Reel Taping Specification
•Material: Black Conductive High Impact Polystyrene Alloy (UP-6100)
•Surface resistivity 109– 1012 Ω/□
•Quantity per reel: 1000 pcs./reel
Tape Reel Drawing ( Unit: mm )

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Polystyrene Alloy Taping Specifications
10 sprocket hole pitch cumulative tolerance ±0.20mm
Carrier camber is within 1mm in 250mm
A0 and B0 measured on a plane 0.3mm above the bottom of the pocket
K0 measured from a plane on the inside bottom of the pocket to the top surface of the carrier
Material: black anti-static polystyrene alloy
All dimensions meet EIA-481-3 requirements
Thickness: 0.50±0.05cm
Packing length per 22” reel: 50.0 Meters (1:2)
Component load per 15” reel: 1000 pcs. (SUR-56-3-XL)
Polystyrene Alloy Taping Drawing

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Reflow Profile
High quality, low defect soldering requires identifying the optimum temperature profile for reflowing
the solder paste. To have the correct profile assures components, boards, and solder joints are not
damaged and reliable solder connection is achievable. Profiles are essential for establishing and
maintaining processes. You must be able to repeat the profile to achieve process consistency. The
heating and cooling rise rates must be compatible with the solder paste and components. The amount
of time that the assembly is exposed to certain temperatures must first be defined and then maintained.
The following is an example of a typical thermal profile.

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Ordering Information
For every order of 1000 pcs , Leadtek will ship the modules with the reel package (shown on page 15).
For order quantities less than 1000 pcs, or when ordering non-whole numbers, Leadtek will snip the
taping and ship the quantity that you request without the reel.
To place an order, please contact [email protected]

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Glossary
A-GPS
Assisted GPS or AGPS is a technology that uses an assistance server to cut down the time needed to
find the location. Although GPS provides excellent position accuracy, position fixes require lines of
sight to the satellites. In regular GPS networks there are only GPS satellites and GPS receivers.
In A-GPS networks, the receiver, being limited in processing power and normally under less than ideal
locations for position fixing, communicates with the assistance server that has high processing power
and access to a reference network. Although dependent on cellular coverage, AGPS processing is
quicker and more efficient than regular GPS.
API
An application programming interface is a set of definitions of the way one piece of computer software
communicates with another. One of the primary purposes of an API is to provide a set of commonly
used functions, such as to draw windows or icons on the screen. Programmers can then take advantage
of the API by making use of its functionality, saving them the task of programming everything from
scratch.
Baud Rate
Is a measure of the signaling rate, which is the number of changes to the transmission media per
second in a modulated signal.
For Example: 250 baud means that 250 signals are transmitted in one second. If each signal carries 4
bits of information then in each second 1000 bits are transmitted. This is abbreviated as 1000 bit/s.

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Dead Reckoning
The process of estimating your position by advancing a known position using course, speed, time and
distance to be traveled. It is figuring out where you will be at a certain time if you hold the speed, time
and course you plan to travel.
Differential GPS (DGPS)
An extension of the GPS system that uses land-based radio beacons to transmit position corrections to
GPS receivers. DGPS reduces the effect of selective availability, propagation delay, etc. and can
improve position accuracy to better than 10 meters.
EGNOS (European Geostationary Navigation Overlay System)
A satellite navigation system being developed by the European Space Agency, the European
Commission, and EUROCONTROL. It is intended to supplement the GPS and GLONASS systems by
reporting on the reliability and accuracy of the signals. According to specifications, horizontal position
accuracy should be better than 7 meters. In practice, the horizontal position accuracy is at the meter
level. It will consist of three geostationary satellites and a network of ground stations.
Similar service is provided in America by the WAAS system. See WAAS.
LNA (Low Noise Amplifier)
A special type of electronic amplifier or amplifier used in communication systems to amplify very
weak signals captured by an antenna. It is usually located at the antenna and is a key component, which
is placed at the front-end of a receiver system.
Multi-path mitigation
Anticipating errors caused when a satellite signal reaches the GPS receiver antenna by more than one
path. Usually caused by one or more paths being bounced or reflected off of structures near the
antenna and occurs to some extent everywhere. The signal which traverses a longer path will yield a
larger pseudo range estimate and increase the error.