Global Sat EM-318-02 Manuale utente

EM-318-02

Specifications are subject to be changed without notice.

Page 1 of 16

Version 1.2.1

GPS Engine Board

EM-318-02

(w/o Patch Antenna)

Globalsat Technology Corporation

16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan

Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899

service@globalsat.com.tw

www.globalsat.com.tw

USGlobalSat, Inc.

14740 Yorba Court, Chino, CA 91710

Tel: 909.597.8525 / Fax: 909.597.8532

oem@usglobalsat.com

www.usglobalsat.com

EM-318-02

Specifications are subject to be changed without notice.

Page 2 of 16

Version 1.2.1

Product Information

Product Part I.D. EM-318-02

Product Description:

EM-318-02 is a compact, high performance, and low power consumption GPS engine board. By

elimination the on-board GPS patch antenna, the EM-318-02 be engineered into tighter spaces where

an external antenna would be more practical. The EM-318-02 utilizes the SiRF GSC3f/LP chipset,

which can track up to 20 satellites at a time and perform fast TTFF in low signal environments. It is

suitable for portable electronic devices such as automotive navigation devices, handheld navigation

devices, mobile phones, and other GPS applications.

Product Features:

9SiRF GSC3f/LP chipset

920 parallel channels

9Extremely fast TTFFs at low signal levels

91 serial ports

9Built-in LNA (without built-in patch antenna)

9NMEA 0183 v3.01 (Default:GGA,GSA,GSV,RMC) SiRF NMEA Command

9SBAS (WAAS and EGNOS and MSAS) support

9ARM 7 TDMI microprocessor

9RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF Star III/FLP Single

Frequency L1, 1575.42 MHz

Code C/A Code

Protocol NMEA 0183 v2.2

Default:GGA,GSA,GSV,RMC

Support:VTG,GLL,ZDA)

SiRF binary and NMEA Command

Serial I/O Port 1UART Ports

Available Baud Rate 4800/9600/14400/19200/38400/57600

Channels 20

Flash 4Mbit

EM-318-02

Specifications are subject to be changed without notice.

Page 3 of 16

Version 1.2.1

Sensitivity Tracking:-159dBm

Cold Start 42 seconds average

Warm Start 38 seconds average

Hot Start 1 second average

Reacquisition 0.1 second average

Accuracy Position: 10 meters, 2D RMS

5 meters, 2D RMS, WAAS enabled

Velocity: 0.1 m/s

Time: 1us synchronized to GPS time

Maximum Altitude 18,000 meter

Maximum Velocity 515 meter/second

Maximum Acceleration 4G

Update Rate 1 Hz

SBAS WAAS, EGNOS, MSAS

Interface

I/O Connector Type 10-pin Molex Micro-Miniature (1.25mm)

External Antenna Port MMCX

Physical Characteristic

Dimensions 1.2” x 1.2” x 0.2 (30 x 30 x 4.8 mm)

DC Characteristics

Power Supply 3.3V ~ 5.5V ±5%

Backup Voltage 2.0 ~ 3.6V

Power Consumption Tracking: 45mA

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -22F to 185F (-30C to 85C)

Storage Temperature -40F to 257F (-40C to 125C)

Recommended GPS Active Antenna Specifications

Frequency: 1575.42+2 MHz

Axial Ratio: 3 dB Typical

Output Impedance: 50Ω

Polarization: RHCP

Amplifier Gain :18~22dB Typical

Output VSWR: 2.0 Max.

Noise Figure: 2.0 dB Max.

EM-318-02

Specifications are subject to be changed without notice.

Page 4 of 16

Version 1.2.1

2. Technical Information

Block Diagram

EM-318-02

Specifications are subject to be changed without notice.

Page 5 of 16

Version 1.2.1

Pin Assignment

Pin # Name Description

1 VCC_IN DC Supply Voltage input

2 GND Analog Ground

3 1PPS One Pulse per second output synchronized to GPS time. Not available in

trickle mode.

4 BOOTSEL Boot mode – set high to program flash

5 TXA Serial output for channel

6 RXA Serial input for channel

7 GPIO1 GPS Fix status output

8 VBAT Backup voltage supply This is the battery backup input that powers the SRAM and

RTC when main power is removed. Typical current draw is 15uA. Without an external

backup battery, the module/engine board will execute a cold star after every turn on.

To achieve the faster start-up offered by a hot or warm start, a battery backup must be

connected. The battery voltage should be between 2.0v and 5.0v. (NOTE:This pin

must be kept “HIGH” for operation. From Vcc connect a 470 Ohm resistor in series

with a 3.2v Zener diode to Ground. Then, connect the VBAT input to Zener’s cathode

to pull the input “HIGH”.)

9 NRESET Reset Input (Active Low)

10 NC Not connect

EM-318-02

Specifications are subject to be changed without notice.

Page 6 of 16

Version 1.2.1

Molex Micro-Miniature 1.25mm Connectors

10-Pin Connector

Digi-Key Part No:

WM1728-ND

Molex Part No:

51021-1000

28-32 AWG Crimp

Digi-Key Part No:

WM1775-ND

WM1775TR-ND

Molex Part No:

50058-8000

EM-318-02

Specifications are subject to be changed without notice.

Page 7 of 16

Version 1.2.1

Dimensions

EM-318-02

Specifications are subject to be changed without notice.

Page 8 of 16

Version 1.2.1

3. SOFTWARE COMMAND

■NMEA Output Command

GGA-Global Positioning System Fixed Data

Table B-2 contains the values for the following example:

$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18

Table B-2 GGA Data Format

Name Example Units Description

Message ID $GPGGA GGA protocol header

UTC Time 161229.487 hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

Position Fix Indicator 1 See Table B-3

Satellites Used 07 Range 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude19.0 meters

Units M meters

Geoid Separation1meters

Units M meters

Age of Diff. Corr. second Null fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksum *18

<CR><LF> End of message termination

SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.

Table B-3 Position Fix Indicator

Value Description

0 Fix not available or invalid

1 GPS SPS Mode, fix valid

2 Differential GPS, SPS Mode , fix valid

3 GPS PPS Mode, fix valid

EM-318-02

Specifications are subject to be changed without notice.

Page 9 of 16

Version 1.2.1

GLL-Geographic Position-Latitude/Longitude

Table B-4 contains the values for the following example:

$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C

Table B-4 GLL Data Format

Name Example Units Description

Message ID $GPGLL GLL protocol header

Latitude 3723.2475 ddmm.mmmm

N/S Indicator n N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

UTC Position 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Checksum *2C

<CR><LF> End of message termination

GSA-GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

TableB-5GSADataFormat

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table B-6

Mode2 3 See Table B-7

Satellite Used107 Sv on Channel 1

Satellite Used102 Sv on Channel 2

Satellite Used1Sv on Channel 12

PDOP 1.8 Position dilution of Precision

HDOP 1.0 Horizontal dilution of Precision

VDOP 1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

1. Satellite used in solution.

EM-318-02

Specifications are subject to be changed without notice.

Page 10 of 16

Version 1.2.1

TableB-6Mode1

Value Description

M Manual-forced to operate in 2D or 3D mode

A 2D automatic-allowed to automatically switch 2D/3D

TableB-7Mode2

Value Description

1 Fix Not Available

2 2D

3 3D

GSV-GNSS Satellites in View

Table B-8 contains the values for the following example:

$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71

$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41

TableB-8GSVDataFormat

Name Example Units Description

Message ID $GPGSV GSV protocol header

Number of Messages12 Range 1 to 3

Message Number11 Range 1 to 3

Satellites in View 07

Satellite ID 07 Channel 1(Range 1 to 32)

Elevation 79 degrees Channel 1(Maximum90)

Azimuth 048 degrees Channel 1(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

……. …….

Satellite ID 27 Channel 4 (Range 1 to 32)

Elevation 27 Degrees Channel 4(Maximum90)

Azimuth 138 Degrees Channel 4(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

Checksum *71

<CR><LF> End of message termination

Depending on the number of satellites tracked multiple messages of GSV data may be required.

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