Globalsat ET-212 User Manual

Globalsat Technology Corporation

PRODUCT USER MANUAL

GPS ENGINE BOARD

ET-212

version 1.2

GlobalSat Technology Corporation
16, No.186,Chien 1 Road, 235Chung Ho City,Taipei Hsien, Taiwan ,R.O.C.

Tel: [phone](Rep.) Fax: [phone]
Web: www.globalsat.com.tw E-mail: [e-mail]

Features:

SiRF GSC2x high performance GPS Chip Set
Very high sensitivity (Tracking Sensitivity: -155 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
Compact size (27.9mm * 20 mm * 3.4mm) suitable for space-sensitive application
One size component, easy to mount on another PCB board
Support NMEA 0183 and SiRF binary protocol

Specification:

General

Chipset SiRF GSC2x
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 12 channel all-in-view tracking
Sensitivity -155 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 8 sec., average
Warm start 38 sec., average
Cold start 45 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 42 mA (With antenna)

Interface

Dimension 27.9mm * 20mm * 3.4mm
Baud rate 4,800 to 57,600 bps adjustable
Output message SiRF binary or

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

Antenna Active antenna

Environmental

Operating Temp -40℃ to +85℃

Pin Assignment

Pin description

* RF:

Connect to External Active Antenna

* VIN (DC power input):
This is the main DC supply for a 3.3V +- 5% DC input power module board.

* BATTERY (Backup 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 5.0v.

* GPIO13:
User can use this I/O pin for special function.

For example, on/off LED

* 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

* RX:

This is the main receive channel for receiving software commands to the engine
board from SiRFdemo software or from user written software.

* GND:

GND provides the ground for the engine board. Connect all grounds.

Application Circuit

Recommend Layout PAD