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GLOBALSAT GPS Engine Board
Hardware Data Sheet
Product No : ET-314AC
Version 2.2
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
E-mail :
service@globalsat.com.tw
Website:
www.globalsat.com.tw
Issue Date
APPR
CHECK
PREPARE
Ray
Luwalk
Jeff
2010/04/01
2010/4/1
- 1 -
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Summary of Contents for Globalsat ET-314AC
- Page 1 GLOBALSAT GPS Engine Board Hardware Data Sheet Product No : ET-314AC Version 2.2 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 E-mail : service@globalsat.com.tw Website: www.globalsat.com.tw Issue Date APPR CHECK...
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Page 2: Product Description
Product Description Product Description ET-314AC 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-314AC is suitable for the following applications:... - Page 3 ET-314AC High Performance GPS Engine Board Product Block Diagram Product Pin Description 2010/4/1 - 3 -...
- Page 4 Output TTL level, 0V ~ 2.85V. TxD1 Serial output (default null) RxD1 Serial input (default null) GPIO14 General purpose I/O 9,25,26 ET-314AC reserves PIN 11,12,13,14, GND_A GPS RF Ground. 15,16,18 RF IN GPS antenna input V_ANT Antenna Bias voltage...
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Page 5: Electrical Specification
ET-314AC High Performance GPS Engine Board Electrical Specification Absolute Maximums Ratings Parameter Min. Typ. Max. Conditions Unit POWER Supply Main power supply Backup battery supply Main power supply Current 23.80 26.24 26.70 Backup battery supply Current 12.6 Interface (VCC = 3.3V, VBAT= 3.3V, Operation Temp.= 25℃) High Level input Voltage 0.7*VDD... - Page 6 ET-314AC High Performance GPS Engine Board Environmental Characteristics Parameter Unit Humidity Range % non-condensing Operation Temperature ℃ Storage Temperature ℃ Physical Characteristic Type 30-pin stamp holes Dimensions 25.4 mm *25.4 mm * 2.50 mm ±0.2mm Package Dimensions 2010/4/1 - 6 -...
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Page 7: Power Circuit
ET-314AC High Performance GPS Engine Board Application Application Circuit POWER Circuit GPS POWER GPS_3V3 VOUT BLM18AG121SN1D XC6209B332MRN 3.3V 22UF/10V 10UF/16V 470PF GPS Active Antenna Specifications (Recommendation) Frequency: 1575.42 + 2MHz Amplifier Gain: 18~22dB Typical Axial Ratio: 3 dB Typical Output VSWR: 2.0 Max. -
Page 8: Operating Description
This is Ground pin for the baseband circuit. VDD28OUT This PIN is output voltage 2.85V. If do not GND_A This is Ground pin for the ET-314AC RFand use it, Just NC. circuit. To use ET-314AC, GND_A need RESET connect to GND with L bead or 0Ω resistor. - Page 9 ET-314AC High Performance GPS Engine Board SOFTWARE COMMAND NMEA Output Command GGA - Global Positioning System Fixed Data Note – Fields marked in italic apply only to NMEA version 2.3 (and later) in this NMEA message description Table A-1 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...
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Page 10: Gll - Geographic Position-Latitude/Longitude
ET-314AC High Performance GPS Engine Board Note – A valid status is derived from all the parameters set in the software. This includes the minimum number of satellites required, any DOP mask setting, presence of DGPS corrections, etc. If the default or current software setting requires that a factor is met, then if that factor is not met the solution will be marked as invalid. - Page 11 ET-314AC High Performance GPS Engine Board 1 Fix Not Available Mode 2 2 2D 3 3D Satellite Used Sv on Channel 1 Satellite Used Sv on Channel 2 ….. Satellite Used Sv on Channel 12 PDOP Position dilution of Precision...
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Page 12: Rmc - Recommended Minimum Specific Gnss Data
ET-314AC High Performance GPS Engine Board SNR(C/No) dBHz Range 0 to 99,null when not tracking Checksum <CR><LF> End of message termination Depending on the number of satellites tracked, multiple messages of GSV data may be required. In some software versions, the maximum number of satellites reported as visible is limited to 12, even though more may be visible. - Page 13 ET-314AC High Performance GPS Engine Board are geodetic WGS84 directions relative to true North. VTG - Course Over Ground and Ground Speed Note – Fields marked in italic apply only to NMEA version 2.3 (and later) in this NMEA message description Table A-7 contains the values for the following example: $GPVTG,309.62,T,,M,0.13,N,0.2,K,A*23...
- Page 14 ET-314AC High Performance GPS Engine Board NMEA Input Command A). Set Serial Port ID: 100 Set PORTA parameters and protocol This command message is used to set the protocol (SiRF Binary or NMEA) and/or the communication parameters (baud rate, data bits, stop bits, and parity). Generally, this command is used to switch the module back to SiRF Binary protocol mode where a more extensive command message set is available.
- Page 15 ET-314AC High Performance GPS Engine Board B). Navigation lnitialization ID：101 Parameters required for start This command is used to cause a restart of the receiver, and to specify the type of restart. Optionally, it may also initialize position (in X, Y, Z ECEF coordinates), clock drift, GPS Time Of Week and GPS Week Number.
- Page 16 ET-314AC High Performance GPS Engine Board Table B-3 Reset Configuration Bit Map Description Data valid flag: 1 = Use data in ECEF X, Y, Z, Clock Offset, Time of Week and Week 0☆ number to initialize the receiver; 0 = Ignore data fields...
- Page 17 ET-314AC High Performance GPS Engine Board C). Set DGPS Port ID: 102 Set PORT B parameters for DGPS input This command is used to control the serial port used to receive RTCM differential corrections. Differential receivers may output corrections using different communication parameters. If a DGPS receiver is used that has different communication parameters, use this command to allow the receiver to correctly decode the data.
- Page 18 ET-314AC High Performance GPS Engine Board Mode 0 = Set Rate, 1 = Query one time Rate Output Rate, 0 = Off, 1-255 = seconds between messages1 CksumEnable 01 0=Disable Checksum, 1=Enable Checksum .Checksum <CR> <LF> End of message terminatio...
- Page 19 ET-314AC High Performance GPS Engine Board Table B-8 LLA Navigation Initialization Data Format Name Example Unit Description Message ID $PSRF104 PSRF104 protocol header 37.3875111 degrees Latitude + = North (Range 90 to -90) -121.97232 degrees Longitude + = East (Range 180 to -180)
- Page 20 ET-314AC High Performance GPS Engine Board F). Development Data On/Off ID: 105 Switch Development Data Messages On/Off This command turns development data (debug messages) on and off. Development data can be used to help diagnose system problems since many parts of the software contain messages that are output when problems are detected.
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Page 21: Recommended Layout Pad
ET-314AC High Performance GPS Engine Board PCB Layout Recommend Recommended Layout PAD Unit: mm Tolerance: 0.1mm PCB Layout Recommendations Do not routing the other signal or power trace under the engine board. This pin receives signal of GPS analog via external active antenna .It has to be a controlled impedance trace at 50ohm. -
Page 22: Recommended Reflow Profile
ET-314AC High Performance GPS Engine Board Recommended Reflow Profile: 150±10[℃] Pre heating temperature: Pre heating time: 90±30[sec.] 235±5[℃] Heating temperature: Heating time: 10±1[sec.] 2010/4/1 - 22 -...
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