USGlobalsat EM-318-02 User Manual
EM-318-02
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
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USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: 909.597.8525 / Fax: 909.597.8532
oem@usglobalsat.com
www.usglobalsat.com
Specifications are subject to be changed without notice.
EM-318-02
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:
9 SiRF GSC3f/LP chipset
9 20 parallel channels
9 Extremely fast TTFFs at low signal levels
9 1 serial ports
9 Built-in LNA (without built-in patch antenna)
9 NMEA 0183 v3.01 (Default:GGA,GSA,GSV,RMC) SiRF NMEA Command
9 SBAS (WAAS and EGNOS and MSAS) support
9 ARM 7 TDMI microprocessor
9 RoHS 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
Serial I/O Port 1UART Ports
Available Baud Rate 4800/9600/14400/19200/38400/57600
Channels 20
Flash 4Mbit
Default:GGA,GSA,GSV,RMC
Support:VTG,GLL,ZDA)
SiRF binary and NMEA Command
Specifications are subject to be changed without notice.
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EM-318-02
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
Version 1.2.1
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.
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Specifications are subject to be changed without notice.
EM-318-02
2. Technical Information
Block Diagram
Version 1.2.1
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Specifications are subject to be changed without notice.
EM-318-02
Pin Assignment
Pin # Name Description
VCC_IN DC Supply Voltage input
1
Version 1.2.1
GND Analog Ground
2
1PPS One Pulse per second output synchronized to GPS time. Not available in
3
trickle mode.
BOOTSEL Boot mode – set high to program flash
4
TXA Serial output for channel
5
RXA Serial input for channel
6
GPIO1 GPS Fix status output
7
VBAT
8
NRESET Reset Input (Active Low)
9
Backup voltage supply
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.
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”.)
This is the battery backup input that powers the SRAM and
(NOTE: This pin
10
NC Not connect
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Specifications are subject to be changed without notice.
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