GlobalSat ET-312 User Guide

Globalsat Technology Corporation

PRODUCT USER MANUAL

GPS ENGINE BOARD

ET-312

Globalsat Technology Corporation

Headquarters (Far East Century Park)

16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan
Tel: [phone]/ Fax: [phone]
E-mail : [e-mail]
Website: www.globalsat.com.tw

GPS ENGINE BOARD: ET-312

Specification:

General

Chipset SiRF StarⅢ
Frequency L1, 1575.42 MHz

C/A code 1.023 MHz chip rate
Channels 20 channel all-in-view tracking
Sensitivity -159 dBm

Accuracy

Position 10 meters, 2D RMS
5 meters, 2D RMS, WAAS enabled
Velocity 0.1 m/s
Time 1us synchronized to GPS time

Datum

Default WGS-84

Acquisition Time

Reacquisition 0.1 sec., average
Hot start 1 sec., average
Warm start 38 sec., average
Cold start 42 sec., average

Dynamic Conditions

Altitude 18,000 meters (60,000 feet) max
Velocity 515 meters /second (1000 knots) max
Acceleration Less than 4g
Jerk 20m/sec **3

Power

Main power input 3.3V +- 5% DC input
Power consumption 80mA (Continuous mode)
65mA(Trickle power mode)

Interface

Dimension 27.9mm * 20mm * 2.9mm
Baud rate 4,800 to 57,600 bps adjustable
Output message SiRF binary or

NMEA 0183 GGA, GSA, GSV, RMC,VTG,GLL

Antenna Active or passive antenna
Environmental

Operating Temp -40ºC to +85ºC

Globalsat Technology Corporation

Tel: [phone]/Fax: [phone]

E-mail : [e-mail]

Website: www.globalsat.com.tw

Pin Assignment

M1

1

GND

2

RF

3

GND

GND
GND

GPS ENGINE BOARD: ET-312

13
12

4

GND

5

GND

6

GND

7

VIN

GPS Engine Board

GPIO1

BATTERY

RX

TX

11
10
9
8

Pin description

Pin NO. Pin Name Remark

1. GND Ground.

2. RF Connect to Patch Anten na or 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

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.

Globalsat Technology Corporation

Tel: [phone]/Fax: [phone]

E-mail : [e-mail]

Website: www.globalsat.com.tw