USGlobalsat EM-318-01 User Manual

EM-318-01

Version 1.2.2

GPS Engine Board

EM-318-01

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

Page 1 of 16

USGlobalSat, Inc.

14740 Yorba Court, Chino, CA 91710
Tel: [phone] / Fax: [phone]

[e-mail]
www.usglobalsat.com

Specifications are subject to be changed without notice.

EM-318-01

Version 1.2.2

Product Information



Product Part I.D. EM-318-01
Product Description:



EM-318-01 is a compact, high performance, and low power consumption GPS engine board. The
EM-318-01 uses SiRF’s 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 (with built-in on-board 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

Sensitivity Tracking:-159dBm

Cold Start 42 seconds average

Default:GGA,GSA,GSV,RMC

Support:VTG,GLL,ZDA)

SiRF binary and NMEA Command

Specifications are subject to be changed without notice.

Page 2 of 16

EM-318-01

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

Version 1.2.2

Physical Characteristic

Dimensions 1.2” x 1.2” x 0.37 (30 x 30 x 9.5 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.

Page 3 of 16

Specifications are subject to be changed without notice.

EM-318-01

2. Technical Information

 Block Diagram

Version 1.2.2

Page 4 of 16

Specifications are subject to be changed without notice.

 Pin Assignment

EM-318-01

Version 1.2.2

Pin # Name Description

VCC_IN DC Supply Voltage input

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
8

VBAT

Backup voltage supply

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

backup power supply, the GPS module/engine board will execute a cold star upon

each power-up. To achieve the faster start-ups a backup must be connected to this

pin (battery or Gold /Super capacitor). The voltage should be between 2.0v and 5.0v.

(NOTE: The VBAT pin must be kept “HIGH” for in order for the GPS board/module to

function if no backup power is going to be used. From the VCC, connect a 470 Ohm ¼

Watt resistor in series with a 3.2v Zener diode to Ground. Connect the VBAT pin to the

Zener’s cathode to pull the input “HIGH”.)

This is the battery backup input that powers the SRAM and

NRESET Reset Input (Active Low)

9

10

NC Not connect

Specifications are subject to be changed without notice.

Page 5 of 16