ET-312
ET-312
Version 1.4
GPS Engine Board ET-312
Version 1.4
01/20/2010
Globalsat Technology Corporation Headquarters (Far East Century Park)
16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan
Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899
E-mail : service@globalsat.com.tw
Website: www.globalsat.com.tw
Page 1 of 21
ET-312
Version 1.4
1. Product Information
Product Name: ET-312
Product Description:
ET-312 is a compact, high performance, and low power consumption GPS engine board. It uses SiRF
Star III chipset which can track up to 20 satellites at a time and perform fast TTFF in weak signal
environments. ET-312 is suitable for the following applications:
‧ Automotive navigation
‧ Personal positioning
‧ Fleet management
‧ Mobile phone navigation
‧ Marine navigation
Product Features:
SiRF star III high performance GPS Chipset
Very high sensitivity (Tracking Sensitivity: -159 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
One serial ports
4Mb flash
Built-in LNA
Compact size (28mm * 20 mm * 2.9mm) suitable for space-sensitive application
One size component, easy to mount on another PCB board
Support NMEA 0183 and SiRF binary protocol
Product Specifications
Chipset SiRF GSC3f/LP
Frequency L1, 1575.42 MHz
Code C/A Code
GPS Receiver
Protocol NMEA 0183 v2.2
Default:GGA,GSA,GSV,RMC
Support:VTG,GLL,ZDA)
SiRF binary and NMEA Command
Available Baud Rate 4,800 to 57,600 bps adjustable
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 2 of 21
ET-312
Channels 20
Flash 4Mbit
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
Version 1.4
Maximum Altitude
Maximum Velocity
Maximum Acceleration
Update Rate 1 Hz
DGPS WAAS, EGNOS, MSAS
Datum WGS-84
I/O Pins 1 serial ports
Type 13-pin stamp holes
Dimensions 28 mm * 20 mm * 2.9 mm
Power Supply
Backup Voltage
Power Consumption
＜ 18,000 meter
＜ 515 meter/second
＜ 4G
Interface
Physical Characteristic
DC Characteristics
3.3Vdc ± 5%
2.0 ~ 3.6Vdc ± 10%
Acquisition: 60mA
Tracking: 42mA
Environmental Range
Humidity Range 5% to 95% non-condensing
Operation Temperature
Storage Temperature
-30℃ to 85℃
-40℃ to 85℃
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 3 of 21
ET-312
2. Technical Information
Block Diagram
Module Pin Assignment:
Version 1.4
M1
1
GND
2
RF
3
GND
4
GND
5
GND
6
GND
7
VIN
GPS Engine Board
BATTERY
GND
GND
RX
GPIO1
13
12
11
10
TX
9
8
Pin NO. Pin Name Remark
1. GND Ground.
2. RF Connect to External Active Antenna. While external antenna is used, the
optional power is needed.
3. GND Ground.
4. GND Ground.
5. GND Ground.
6. GND Ground.
7. VIN This is the main DC supply for a 3.3V +- 5% DC input power module board.
8. BATTERY This is the battery backup input that powers the SRAM and RTC when main
power is removed. Ty pical 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
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 4 of 21
ET-312
5.0v.
9. GPIO1 User can use this I/O pin for special function.For example, on/off LED
10. TX This is the main transmits channel for outputting navigation and
measurement data to user’s navigation software or user written
software.Output TTL level, 0V ~ 2.85V
11. RX This is the main receive channel for receiving software command s to the
engine board from SiRFdemo software or from user written software.
12. GND Ground.
13. GND Ground.
Version 1.4
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 5 of 21
Application Circuit
ET-312
Version 1.4
GPS Active Antenna Specification(Recommendation)
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
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 6 of 21
Dimensions
ET-312
Version 1.4
The Specifications are subject to be changed without notice. Copyright © 2007, GlobalSat Technology.
Page 7 of 21
Loading...