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Huang Modify operation temperature range and product dimension tolerance ALL INFORMATION CONTAINED HEREIN IS THE SOLE PROPERTY OF LEADTEK RESEARCH AND CANNOT BE DISSEMINATED WITHOUT THE EXPRESS WRITTEN CONSENT OF LEADTEK RESEARCH. i LR9548S Specifications Sheet Rev. 1.7 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™ low power single chipset, 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 low power 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 SiRF GSW3 v3.2.4 software Multiple I/O pins reserved for customizing special user applications RoHS compliance 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 © 2008 Leadtek Research Inc. All rights reserved. Page 1/13 Preliminary Confidential - Information is subject to change without prior notice. LR9548S Specifications Sheet Rev. 1.7 Interface TTL level serial port for GPS communications interface Protocol: NMEA-0183/SiRF Binary (default NMEA) Baud Rate: 4800,9600,19200,38400,57600 bps 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 © 2008 Leadtek Research Inc. All rights reserved. Page 2/13 Preliminary Confidential - Information is subject to change without prior notice. LR9548S Specifications Sheet Rev. 1.7 Specifications Technical Specifications Feature Item Description Chipset GSC3f SiRFstarIII low power single chipset Frequency L1, 1575.42 MHz C/A code 1.023 MHz chip rate General Channels 20 Accuracy Position 10 meters, 2D RMS < 5 meters 2D RMS, WAAS corrected Velocity 0.1 meters/second Time 1 microsecond synchronized to GPS time Datum Default WGS-84 Other selectable for other Datum Time to First Fix Reacquisition 0.1 sec., average (TTFF) Snap start 1 sec., average (Open Sky & Hot start 1 sec., average typical TTFF Stationary Warm start 38 sec., average typical TTFF Requirements) Cold start 42 sec., average typical TTFF Dynamic Altitude 18,000 meters (60,000 feet) max. Conditions Velocity 515 meters/second (1000 knots) max. Acceleration 4g, max. Jerk 20 meters/second3, max. Power Main power input Power consumption Supply Current 3.3 ~ 5.0 VDC input .165 mW (continuous mode) .49 mA Serial Port Time-1PPS Backup Power Electrical interface Protocol messages Level 1.65 ~ 5.0 VDC input. Two full duplex serial TTL interface. NMEA-0183@4800 bps (Default) TTL Pulse Pulse duration The 1PPS pulse width is 1 .s, this 1PPS is NOT suited to steer various oscillators Time reference Measurement (timing receivers, telecommunications system, etc). At the pulse positive edge. Aligned to GPS second, ±1 microsecond © 2008 Leadtek Research Inc. All rights reserved. Page 3/13 Preliminary Confidential - Information is subject to change without prior notice. LR9548S Specifications Sheet Rev. 1.7 Environmental Characteristics Items Description Operating temperature range -30 deg. C to +85 deg. C Storage temperature range -55 deg. C to +100 deg. C Physical Characteristics Items Description Length 24 mm ± 0.3mm (0.94in) Width 20 mm ± 0.3mm (0.79 in) Height 2.9 mm ± 0.3mm (0.11 in) Weight 2.5g Interface Specifications Items Description I/O 28 pin SMD micro package © 2008 Leadtek Research Inc. All rights reserved. Page 4/13 Preliminary Confidential - Information is subject to change without prior notice. LR9548S Specifications Sheet Rev. 1.7 Reference Design • All ground pads attach directly to ground plane by way of via. • All components are reference only. © 2008 Leadtek Research Inc. All rights reserved. Page 5/13 Preliminary Confidential - Information is subject to change without prior notice. LR9548S Specifications Sheet Rev. 1.7 Software The Leadtek LR9548S module includes GSW3.2.4, the SiRF standard GPS software for SiRFstarIII low power single chipset receivers. Features include: Excellent sensitivity High configurability I Hz position update rate Supports use of satellite-based augmentation systems like...