Global Sat EM-318-02 User manual

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: [phone]/ Fax: [phone]
[e-mail]
www.globalsat.com.tw
USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: [phone] / Fax: [phone]
[e-mail]
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
5
SNR(C/No) 42 dBHz Range 0 to 99,null when not tr
a
……. …….
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
5
SNR(C/No) 42 dBHz Range 0 to 99,null when not tr
a
Checksum *71
<CR><LF> End of message termination
Depending on the number of satellites tracked multiple messages of GSV data may be required.