Global Sat ET-312 User manual

ET-312

Page1of21

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

ET-312

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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

GPS Receiver

Chipset SiRF GSC3f/LP

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

Available Baud Rate 4,800 to 57,600 bps adjustable

ET-312

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Version 1.4

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

Maximum Altitude ＜18,000 meter

Maximum Velocity ＜515 meter/second

Maximum Acceleration ＜4G

Update Rate 1 Hz

DGPS WAAS, EGNOS, MSAS

Datum WGS-84

Interface

I/O Pins 1 serial ports

Physical Characteristic

Type 13-pin stamp holes

Dimensions 28 mm * 20 mm * 2.9 mm

DC Characteristics

Power Supply 3.3Vdc ± 5%

Backup Voltage 2.0 ~ 3.6Vdc ± 10%

Power Consumption Acquisition: 60mA

Tracking: 42mA

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -30℃ to 85℃

Storage Temperature -40℃ to 85℃

ET-312

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Version 1.4

2. Technical Information

Block Diagram

Module Pin Assignment:

GPS Engine Board

GND

VIN

GND

BATTERY

GPIO1

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. 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

ET-312

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Version 1.4

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 commands to the

engine board from SiRFdemo software or from user written software.

12. GND Ground.

13. GND Ground.

ET-312

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Version 1.4

Application Circuit

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

ET-312

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Version 1.4

Dimensions

ET-312

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Version 1.4

Recommend Layout PAD

ET-312

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Version 1.4

Recommended Reflow Profile:

Pre heating temperature: 150±10[ ]℃Pre heating time: 90±30[sec.]

Heating temperature: 235±5[ ]℃Heating time: 10±1[sec.]

Peak temperature must not exceed 240 and the duration of ove℃r 200 should be 30±10℃

Seconds.

10±1s

240℃Max.

30±10s

200℃

150±10℃

90±30s

235±5℃.

Temperature [℃]

Time [sec.]

ET-312

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Version 1.4

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 Exam

le Units Descri

tio

Messa

e ID $GPGGA GGA

rotocol heade

UTC Time 161229.487 hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

/S Indicato

=north or S=south

Lon

itude 12158.3416 dddmm.mmm

E/W Indicato

W E=east or W=wes

Position Fix Indicato

1 See Table B-3

Satellites Use

07 Ran

e 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude19.0 meters

Units M meters

Geoid Se

aration1meters

Units M meters

e of Diff. Corr. second

ull fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksu

*18

<CR><LF> End of messa

e termination

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

Table B-3 Position Fix Indicator

Va l u e D e s c r i

tion

0 Fix not available or invali

1 GPS SPS Mode, fix vali

2 Differential GPS, SPS Mode , fix vali

3 GPS PPS Mode, fix vali

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

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