Global Sat ET-212 User manual

ET-212
Specifications are subject to be changed without notice.
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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: [phone]/ Fax: [phone]
[e-mail]
www.globalsat.com.tw
USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: [phone] / Fax: [phone]
[e-mail]
www.usglobalsat.com

ET-212
Specifications are subject to be changed without notice.
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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
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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.
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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.
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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.
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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
1. Satellite used in solution.