Global Sat ET-212 Manual de usuario

ET-212

Specifications are subject to be changed without notice.

Page 1 of 17

Version 1.3.1

GPS Engine Board

ET-212

Globalsat Technology Corporation

16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan

Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899

service@globalsat.com.tw

www.globalsat.com.tw

USGlobalSat, Inc.

14740 Yorba Court, Chino, CA 91710

Tel: 909.597.8525 / Fax: 909.597.8532

oem@usglobalsat.com

www.usglobalsat.com

ET-212

Specifications are subject to be changed without notice.

Page 2 of 17

Version 1.3.1

1. Product Information

Product Part I.D. ET-212

Product Description

The ET-212 GPS engine board is low cost but maintains high reliability and accuracy making it an ideal

choice for integration with OEM/ODM systems.

Product Features

SiRF GSC2x high performance GPS Chip Set

Very high sensitivity (Tracking Sensitivity: -155dBm)

Extremely fast TTFF (Time To First Fix) at low signal levels

Single-sided component installation, easy to mount on another PCB board

Supports the NMEA 0183 and SiRF Binary protocols

WAAS/ EGNOS support

Foliage Lock for weak signal tracking

Compact in size

All-in-view 20-channel parallel processing

Superior urban canyon performance

RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF GSC2x Single

Frequency L1, 1575.42 MHz

Code 1.023 MHz chip rate

Protocol Electrical Level: TTL level,

Output Voltage Level: 0V~2.85V

Baud Rate: 4,800 – 57,000 bps

Output Message: NMEA 0183 GGA,

GSA, GSV, RMC (VTG, GLL optional)

Active or passive antenna

Channels 20

Sensitivity -155dBm

Cold Start 45 seconds average

ET-212

Specifications are subject to be changed without notice.

Page 3 of 17

Version 1.3.1

Warm Start 38 seconds average

Hot Start 8 second average

Reacquisition 0.1 second average

Accuracy Position: 10 meters, 2D RMS

5 meters, 2D RMS, WAAS enabled

Velocity: 0.1 ms

Time: 1µs synchronized to GPS time

Maximum Altitude 18,000 meters (60,000 feet) max

Maximum Velocity 515 meter/second (1000 knots) max

Maximum Acceleration 4G

Datum WGS-84

Jerk Limit 20m/sec **3

Physical Characteristics

1.1” x 0.8” x 0.11”Dimensions

(28mm x 20mm x 2.9mm)

DC Characteristics

Power Supply 3.3VDC, ±5%

42mA (Continuous Mode)Power Consumption

29mA (Trickle Power Mode)

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -40F to +176F (-40C to 85C)

ET-212

Specifications are subject to be changed without notice.

Page 4 of 17

Version 1.3.1

2. Technical Information

Physical Characteristics

ET-212

Specifications are subject to be changed without notice.

Page 5 of 17

Version 1.3.1

Pin Assignment

ET-212

Specifications are subject to be changed without notice.

Page 6 of 17

Version 1.3.1

Pin Explanation

RF: Connects to a patch, or an 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 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 start 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 5.0 V.

(NOTE:This pin must be kept “HIGH” for operation. From Vcc connect a 470 Ohm resistor in series with a

3.2v Zener diode to Ground. Then, connect the VBAT input to Zener’s cathode to pull the input “HIGH”.)

GPI01: User can use this I/O pin for special functions (for example, an on/off indicator LED).

TX: This is the main transmit channel for outputting navigation and measurement data to user’s

navigation software or user-written software.

RX: This is the main channel for receiving software commands to the engine board from SiRF demo

software or from user-written software.

GND: GND provides the ground for the engine board. Be sure to connect all grounds.

ET-212

Specifications are subject to be changed without notice.

Page 7 of 17

Version 1.3.1

Recommended Pad Layout and Dimensions

ET-212

Specifications are subject to be changed without notice.

Page 8 of 17

Version 1.3.1

Pulse Per Second Test Point

3. Software Commands

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 Example Units Description

Message ID $GPGGA GGA protocol header

UTC Time 161229.487 hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12158.3416 dddmm.mmmm

ET-212 Test Point (TP) 10 is 1 Pulse

Per Second (PPS) Time Mark Output

ET-212

Specifications are subject to be changed without notice.

Page 9 of 17

Version 1.3.1

E/W Indicator W E=east or W=west

Position Fix Indicator 1 See Table B-3

Satellites Used 07 Range 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude19.0 meters

Units M meters

Geoid Separation1meters

Units M meters

Age of Diff. Corr. second Null fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksum *18

<CR><LF> End of message termination

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

Table B-3 Position Fix Indicator

Value Description

0 Fix not available or invalid

1 GPS SPS Mode, fix valid

2 Differential GPS, SPS Mode , fix valid

3 GPS PPS Mode, fix valid

ET-212

Specifications are subject to be changed without notice.

Page 10 of 17

Version 1.3.1

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

Table B-4 GLL Data Format

Name Example Units Description

Message ID $GPGLL GLL protocol header

Latitude 3723.2475 ddmm.mmmm

N/S Indicator n N=north or S=south

Longitude 12158.3416 dddmm.mmmm

E/W Indicator W E=east or W=west

UTC Position 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Checksum *2C

<CR><LF> End of message termination

GSA-GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

TableB-5GSADataFormat

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table B-6

Mode2 3 See Table B-7

Satellite Used107 Sv on Channel 1

Satellite Used102 Sv on Channel 2

Satellite Used1Sv on Channel 12

PDOP 1.8 Position dilution of Precision

HDOP 1.0 Horizontal dilution of Precision

VDOP 1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

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