Datasheet LR9548S Datasheet (QLEADTEK)

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.

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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.

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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: +886-(0)2 8226 5800

Fax: +886-(0)2 8226 3087

[email protected]

Leadtek Research USA 910 Auburn Ct. Fremont, CA 94538, USA

Telephone: +510 490 8076

Fax: +510 490 7759

[email protected]

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

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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 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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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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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 Baud rate Code type Datum Protocol message Output frequency

SiRF GSW3.2.0 4800, 9600, 19200, 38400 or 57600 bps (default 4800) NMEA-0183 ASCII WGS-84 GGA(1sec), GSA(5sec), GSV(5sec), RMC(1sec),VTG(1sec) 1 Hz

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Electrical Specifications

Block Diagram

9548S Block Diagram

Antenna

LNA

bandpass

filter

RFIN

antenna power

16.369MHz TCXO

SiRF GSC3f

2.85 VD C regulator

+ power in + backup battery

voltage

detector

32.768KHz Crystal

serial IO

1.50 VDC regulator

Interface Specification

Photos and Pin Positions

Pin 28

Pin 15

Serial Number

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Model Number

Pin 1

Pin 14

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Pin Settings

PIN Name Type Description

1 FREQ_XFER I If not used, keep floating 2 NC I/O Not connected 3 NC I/O Not connected 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, keep floating 8 TIMEMARK I/O 1 PPS output 9 NC I/O Not connected 10 GPIO13 I/O Reserved, keep floating 11 GPIO0 I/O Reserved, keep floating 12 GPIO1 I/O Reserved, keep floating 13 GPIO14 I/O Reserved, keep floating 14 GND PWR Ground 15 VCC_IN PWR 3.2~5.0V DC supply input

16 VSTBY PWR

17 BOOTSEL I Pull high for programming mode. If not used, keep floating 18 PBRESN I Reset pin, active low, If not used, keep floating 19 GPIO15 I/O Reserved, keep floating 20 GND PWR Ground 21 NC I/O Not connected 22 NC I/O Not connected 23 TXDB O TTL UART Port B output. If not used, keep floating 24 NC O Not connected 25 ANTPWR PWR Antenna power input 26 GND PWR Ground 27 RFIN I RF Signal input 28 GND PWR Ground

Apply 1.65~5.0V DC for backup RTC & SRAM. If not used, keep floating

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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)

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Recommended Footprint

(Unit: mm)

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Automated Manufacturing Components

Reel Taping Specification

Material: Black Conductive High Impact Polystyrene Alloy (UP-6100)

Surface resistivity 10

Quantity per reel: 1000 pcs./reel

(Unit: mm)

9

– 1012 Ω/□

Tape Reel Drawing

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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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RoHS Compliance

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Ordering Information

For every order of 1000 pcs , Leadtek will ship the modules with the reel package (shown on page 12).

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, 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.

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.

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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.

NMEA (National Marine Electronics Association)

An U.S. standards committee that defines data message structure, contents, and protocols to allow the

GPS receiver to communicate with other pieces of electronic equipment.

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1PPS

Pulse which is generated once per second. GPS and some radio clocks and related timekeeping gear

have a pulse-per-second or PPS signal that is needed for high accuracy time synchronization. The PPS

signal can be connected in either of two ways, either through the data leads of a serial port or through

the modem control leads. Either way requires conversion of the PPS signal,

Most GPS devices emit an RS-232 serial stream with some kind of timestamp format. Many GPS

devices are small realtime systems with the satellite tracking done at high priority, positioning done at

medium priority, and time output done at low priority. The timestamps often have +- 200 ms of jitter

(variance in delay), and output a PPS signal on the exact second.

SMD (Surface Mount Device)

Electronic device components that are mounted directly onto the surface of printed circuit boards

(PCBs). In the industry it has largely replaced the previous construction method of fitting components

with wire leads into holes in the circuit board (also called through-hole technology).

TCXO (Temperature Controlled Crystal Oscillator)

An electronic device that uses the mechanical resonance of a physical crystal to create an electrical

signal with a very precise frequency and can be embedded in integrated circuits. TCXO reduces the

environmental changes of temperature, humidity, and vibration, to keep a stable output frequency.

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Time To First Fix (TTFF)

The time it takes a GPS receiver to find satellites after you first turn it on, when the GPS receiver has

lost memory, or has been moved over 300 miles from its last location. Standard TTFF Timing consists

of:

Mode Requires Timing

Snap Start Hot + Clock + Sat Pos 3 minutes off

Hot Start Warm + Ephemeris 30 minutes off

Warm Start Position Accuracy

Time Accuracy

Almanac

Cold Start Nothing N/A

Specifications are typical times assuming good satellite visibility and above threshold signal strengths.

WAAS

A system of satellites and ground stations that provide GPS signal corrections for better position

accuracy. A WAAS-capable receiver can give you a position accuracy of better than three meters, 95

percent of the time. (At this time, the system is still in the development stage and is not fully

operational.) WAAS consists of approximately 25 ground reference stations positioned across the

United States that monitor GPS satellite data. Two master stations, located on either coast, collect data

from the reference stations and create a GPS correction message.

<500 KM

<2 hours

<1 year

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Leadtek Research Inc. 18F, 166, Chien-Yi Rd., Chung Ho, Taipei Hsien, Taiwan (235)

Version 1.52 09/26/06