© Semtech 2005

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2

RGPSM202

SlimGPS™ Receiver

Table of Contents

1

FIRSTGPS ARCHITECTURE HIGHLIGHTS................................................................................................................3

1.1

Industry Leading GPS Performance ......................................................................................................................3

1.2

Low Power .............................................................................................................................................................3

1.3

RGPSM202 SlimGPS Receiver Highlights............................................................................................................3

2

FUNCTIONAL BLOCK DIAGRAM ................................................................................................................................3

3

PIN DESCRIPTION.......................................................................................................................................................4

4

TECHNICAL CHARACTERISTICS...............................................................................................................................4

4.1

Specifications.........................................................................................................................................................4

4.2

Physical Characteristics.........................................................................................................................................5

4.3

Mechanical Interface..............................................................................................................................................5

4.4

Production Issues ..................................................................................................................................................6

4.4.1

Proposed Customer Solder Profile.................................................................................................................6

5

INTERFACE DEFINITION, PRINCIPLES OF OPERATION ........................................................................................6

5.1

Data/RF Interface...................................................................................................................................................6

5.2

Operating Modes ...................................................................................................................................................8

5.2.1

Operating the GPS receiver in a basic “stand-alone” configuration...............................................................8

5.2.2

Operating the GPS receiver in a basic “serial, bidirectional” configuration....................................................9

5.3

NMEA Standard Message Set Specification .......................................................................................................10

5.3.1

NMEA Standard Sentences..........................................................................................................................10

5.3.2

GGA —Global Positioning System Fixed Data ............................................................................................10

5.3.3

GLL—Geographic Position - Latitude/Longitude..........................................................................................11

5.3.4

GSA—GNSS DOP and Active Satellites ......................................................................................................11

5.3.5

GSV—GNSS Satellites in View ....................................................................................................................12

5.3.6

RMC—Recommended Minimum Specific GNSS Data ................................................................................13

5.3.7

VTG—Course Over Ground and Ground Speed .........................................................................................13

5.3.8

ZDA—Time & Date .......................................................................................................................................14

5.3.9

GPQ—NMEA Sentence Query.....................................................................................................................14

5.4

NMEA Specific Sentences...................................................................................................................................15

5.4.1

DI – Diagnostic Message..............................................................................................................................15

5.4.2

TF—Quick Test ............................................................................................................................................15

5.4.3

NM – Sentence Mask and Automatic Output Rate ......................................................................................16

5.4.4

PS – Pulse-Per-Second Configuration .........................................................................................................17

5.4.5

PT – Port Configuration ................................................................................................................................17

5.4.6

RT – Reset the Receiver / Start-Stop FirstGPS ...........................................................................................17

5.4.7

VR – Version Information .............................................................................................................................18

5.4.8

GS – Geodetic System Configuration ..........................................................................................................18

5.4.9

LP – Power Save Mode................................................................................................................................19

5.4.10

TR – Transparent Mode ..............................................................................................................................19

5.5

GPS Data Back-up ..............................................................................................................................................22

5.6

Real Time clock ...................................................................................................................................................22

5.7

Split Search Mode................................................................................................................................................22

5.8

Hardware Reset and System Watchdog .............................................................................................................22

6

DEFAULT SETTINGS.................................................................................................................................................23

6.1

GPS Engine Configuration...................................................................................................................................24

6.1.1

Receiver configuration..................................................................................................................................24

6.1.2

Filter configuration ........................................................................................................................................24

6.1.3

Offset configuration ......................................................................................................................................24

6.1.4

Application settings.......................................................................................................................................24

7

APPLICATION INFORMATION ..................................................................................................................................24

7.1

Active Antenna.....................................................................................................................................................24

8

EXHIBIT A ...................................................................................................................................................................25