Datasheet of GPS smart antenna module, LS20025

LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
¬ 886-2-8698-3699
ßwww.locosystech.com
Product name
Description
LS20025
GPS smart antenna module/SS3LP,MMCX,9600BPS,
Version
1.1
Datasheet of GPS smart antenna module, LS20025
1
Introduction
LS20025 is a complete GPS smart antenna module, including an embedded patch antenna,
automatic external antenna switch and GPS receiver circuits, designed for portable devices that are
going to integrate GPS function. The module is powered by SiRF star III low power chip and can
track up to 20 satellites at a time while providing fast time-to-first-fix, one-second navigation update
and low power consumption. Besides, it can provide you with superior sensitivity and performance
even in urban canyon and dense foliage environment. The miniature size makes it the best choice to
be integrated into portable devices, such as cellular phones, digital cameras, portable media players
and portable navigation devices.
2
3
Features
z
z
z
z
SiRF Star III low power solution
Support 20-channel GPS
Fast TTFF at low signal level
Capable of SBAS (WAAS, EGNOS, MSAS)
z
Optimal RF design for cellular phone
z
Built-in external antenna switch (MMCX connector)
Application
z
z
z
z
z
Cellular phones with GPS function
Digital cameras with GPS function
PMP with GPS navigation
Portable navigation device
GPS personal tracker
Page 1/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
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Fig 3-1 System block diagram of LS20025
Page 2/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
¬ 886-2-8698-3699
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4
GPS receiver
Chip
SiRF Star III low power, GSC3f/LP 7979
Frequency
L1 1575.42MHz, C/A code
Channels
Support 20 channels
Update rate
1Hz
Acquisition Time
Position Accuracy
Hot start (Open Sky)
< 2s
Cold Start (Open Sky)
38s (typical)
Autonomous
< 10m (2D RMS)
SBAS
< 5m (2D RMS)
Datum
WGS-84 (default)
Max. Altitude
< 60,000 ft
Max. Velocity
< 1,000 knots
Protocol Support
NMEA 0183 ver 3.0
9600 bps, 8 data bits, no parity, 1 stop bits
(Factory default)
1Hz: GGA, GLL, GSA, GSV, RMC, VTG
SiRF Binary
38400 bps, 8 data bits, no parity, 1 stop bits
Table 4.1 Navigation Parameters
5
SBAS
Enabled
Track smooth mode
Enabled
Static navigation mode
Enabled
Software interface
5.1 NMEA output message
Table 5.1-1 NMEA output message
NMEA record
Description
GGA
Global positioning system fixed data
GLL
Geographic position - latitude/longitude
GSA
GNSS DOP and active satellites
GSV
GNSS satellites in view
RMC
Recommended minimum specific GNSS data
VTG
Course over ground and ground speed
z
GGA--- Global Positioning System Fixed Data
Table 5.1-2 contains the values for the following example:
$GPGGA,053740.000,2503.6319,N,12136.0099,E,1,08,1.1,63.8,M,15.2,M,,0000*64
Table5.1- 2 GGA Data Format
Page 3/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
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Name
Example
Units
Message ID
$GPGGA
GGA protocol header
UTC Time
053740.000
hhmmss.sss
Latitude
2503.6319
ddmm.mmmm
N/S indicator
N
N=north or S=south
Longitude
12136.0099
dddmm.mmmm
E/W Indicator
E
E=east or W=west
Position Fix Indicator
1
See Table 5.1-3
Satellites Used
08
Range 0 to 12
HDOP
1.1
Horizontal Dilution of Precision
MSL Altitude
63.8
mters
Units
M
mters
Geoid Separation
15.2
mters
Units
M
mters
Age of Diff. Corr.
second
Diff. Ref. Station ID
0000
Checksum
*64
<CR> <LF>
Description
Null fields when DGPS is not used
End of message termination
Table 5.1-3 Position Fix Indicators
Value
Description
0
Fix not available or invalid
1
GPS SPS Mode, fix valid
2
Differential GPS, SPS Mode, fix valid
3-5
Not supported
6
Dead Reckoning Mode, fix valid
z
GLL--- Geographic Position – Latitude/Longitude
Table 5.1-4 contains the values for the following example:
$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52
Table 5.1-4 GLL Data Format
Name
Example
Units
Description
Message ID
$GPGLL
GLL protocol header
Latitude
2503.6319
ddmm.mmmm
N/S indicator
N
N=north or S=south
Longitude
12136.0099
dddmm.mmmm
E/W indicator
E
E=east or W=west
Page 4/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
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UTC Time
053740.000
hhmmss.sss
Status
A
A=data valid or V=data not valid
Mode
A
A=autonomous, D=DGPS, E=DR
Checksum
*52
<CR> <LF>
z
End of message termination
GSA---GNSS DOP and Active Satellites
Table 5.1-5 contains the values for the following example:
$GPGSA,A,3,24,07,17,11,28,08,20,04,,,,,2.0,1.1,1.7*35
Table 5.1-5 GSA Data Format
Name
Example
Units
Description
Message ID
$GPGSA
GSA protocol header
Mode 1
A
See Table 5.1-6
Mode 2
3
See Table 5.1-7
ID of satellite used
24
Sv on Channel 1
ID of satellite used
07
Sv on Channel 2
….
….
ID of satellite used
Sv on Channel 12
PDOP
2.0
Position Dilution of Precision
HDOP
1.1
Horizontal Dilution of Precision
VDOP
1.7
Vertical Dilution of Precision
Checksum
*35
<CR> <LF>
End of message termination
Table 5.1-6 Mode 1
Value
Description
M
Manual- forced to operate in 2D or 3D mode
A
Automatic-allowed to automatically switch 2D/3D
Table 5.1-7 Mode 2
Value
Description
1
Fix not available
2
2D
3
3D
z
GSV---GNSS Satellites in View
Table 5.1-8 contains the values for the following example:
$GPGSV,3,1,12,28,81,285,42,24,67,302,46,31,54,354,,20,51,077,46*73
$GPGSV,3,2,12,17,41,328,45,07,32,315,45,04,31,250,40,11,25,046,41*75
Page 5/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
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$GPGSV,3,3,12,08,22,214,38,27,08,190,16,19,05,092,33,23,04,127,*7B
Table 5.1-8 GSV Data Format
Example
Name
Message ID
Units
Description
$GPGSV
GSV protocol header
3
Range 1 to 3
Message number1
1
Range 1 to 3
Satellites in view
12
Satellite ID
28
Elevation
81
degrees
Channel 1 (Range 00 to 90)
Azimuth
285
degrees
Channel 1 (Range 000 to 359)
SNR (C/No)
42
dB-Hz
Channel 1 (Range 00 to 99, null when not tracking)
Satellite ID
20
Elevation
51
degrees
Channel 4 (Range 00 to 90)
Azimuth
077
degrees
Channel 4 (Range 000 to 359)
SNR (C/No)
46
dB-Hz
Channel 4 (Range 00 to 99, null when not tracking)
Checksum
*73
Total number of messages
1
Channel 1 (Range 01 to 32)
Channel 4 (Range 01 to 32)
<CR> <LF>
End of message termination
1. Depending on the number of satellites tracked multiple messages of GSV data may be required.
z
RMC---Recommended Minimum Specific GNSS Data
Table 5.1-9 contains the values for the following example:
$GPRMC,053740.000,A,2503.6319,N,12136.0099,E,2.69,79.65,100106,,,A*53
Table 5.1-9 RMC Data Format
Name
Example
Message ID
$GPRMC
RMC protocol header
UTC Time
053740.000
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude
2503.6319
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude
12136.0099
dddmm.mmmm
E/W Indicator
E
E=east or W=west
Speed over ground
2.69
knots
Course over ground
79.65
degrees
Date
100106
Description
True
ddmmyy
degrees
Magnetic variation
Variation sense
Mode
Units
E=east or W=west (Not shown)
A
A=autonomous, D=DGPS, E=DR
Page 6/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
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Checksum
*53
<CR> <LF>
z
End of message termination
VTG---Course Over Ground and Ground Speed
Table 5.1-10 contains the values for the following example:
$GPVTG,79.65,T,,M,2.69,N,5.0,K,A*38
Table 5.1-10 VTG Data Format
Name
Example
Message ID
$GPVTG
Course over ground
79.65
Reference
T
Units
Description
VTG protocol header
degrees
Measured heading
True
degrees
Course over ground
Measured heading
Reference
M
Magnetic
Speed over ground
2.69
Units
N
Speed over ground
5.0
Units
K
Kilometer per hour
Mode
A
A=autonomous, D=DGPS, E=DR
Checksum
*38
knots
Measured speed
Knots
km/hr
<CR> <LF>
Measured speed
End of message termination
5.2 Proprietary NMEA input message
Table 5.2-1 Message Parameters
Start Sequence
1
$PSRF<MID>
Payload
Data
2
Checksum
End Sequence
3
*CKSUM
<CR><LF>4
1.
Message Identifier consisting of three numeric characters. Input messages begin at MID 100.
2.
Message specific data. Refer to a specific message section for <data>…<data> definition.
3.
CKSUM is a two-hex character checksum as defined in the NMEA specification, NMEA-0183Standard For
Interfacing Marine Electronic Devices. Use of checksums is required on all input messages.
4.
Each message is terminated using Carriage Return (CR) Line Feed (LF) which is \r\n which is hex 0D0A. Because
\r\n are not printable ASCII characters, they are omitted from the example strings, but must be sent to terminate the
message and cause the receiver to process that input message.
Note: All fields in all proprietary NMEA messages are required, none are optional. All NMEA messages are comma
delimited.
Table 5.2-2 Proprietary NMEA input messages
Message
MID1
Description
Page 7/17
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SetSerialPort
100
Set PORT A parameters and protocol
NavigationInitialization
101
Parameters required for start using X/Y/Z2
SetDGPSPort
102
Set PORT B parameters for DGPS input
Query/Rate Control
103
Query standard NMEA message and/or set output rate
LLANavigationInitialization
104
Parameters required for start using Lat/Lon/Alt3
Development Data On/Off
105
Development Data messages On/Off
Select Datum
106
Selection of datum to be used for coordinate transformations
1.
Message Identification (MID).
2.
Input coordinates must be WGS84.
3.
Input coordinates must be WGS84
z
100---SetSerialPort
This command message is used to set the protocol (SiRF binary or NMEA) and/or the communication parameters (Baud,
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. When a valid message is received, the parameters are stored
in battery-backed SRAM and the Evaluation Receiver restarts using the saved parameters.
Table 5.2-3 contains the input values for the following example:
Switch to SiRF binary protocol at 9600,8,N,1
$PSRF100,0,9600,8,1,0*0C
Table 5.2-3 Set Serial Port Data Format
Name
Example
Units
Message ID
$PSRF100
PSRF100 protocol header
Protocol
0
0=SiRF binary, 1=NMEA
Baud
9600
4800,9600,19200,38400,57600
DataBits
8
8,71
StopBits
1
0,1
Parity
0
0=None, 1=Odd, 2=Even
Checksum
*0C
<CR><LF>
Description
End of message termination
1. SiRF protocol is only valid for 8 data bits, 1 stop bit, and no parity.
z
101---NavigationInitialization
This command is used to initialize the Evaluation Receiver by providing current position (in X, Y, Z coordinates), clock
offset, and time. This enables the Evaluation Receiver to search for the correct satellite signals at the correct signal
parameters. Correct initialization parameters enable the Evaluation Receiver to acquire signals quickly.
Table 5.2-4 contains the input values for the following example:
Start using known position and time
$PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*1C
Page 8/17
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Table 5.2-4 Navigation Initialization Data Format
Name
Example
Units
Description
Message ID
$PSRF101
ECEF X
-2686700
meters
X coordinate position
ECEF Y
-4304200
meters
Y coordinate position
ECEF Z
3851624
meters
Z coordinate position
ClkOffset
96000
Hz
Clock Offset of the Evaluation Receiver1
TimeOfWeek
497260
seconds
GPS Time Of Week
WeekNo
921
GPS Week Number
ChannelCount
12
Range 1 to 12
ResetCfg
3
See Table 5.2-5
Checksum
*1C
PSRF101 protocol header
<CR><LF>
End of message termination
1. Use 0 for last saved value if available. If this is unavailable, a default value of 96000 is used.
Table 5.2-5 Reset Configuration
Hex
Description
0x01
Hot Start – All data valid
0x02
Warm Start – Ephemeris cleared
0x03
Warm Start (with Init) – Ephemeris cleared, initialization data loaded
0x04
Cold Start – Clears all data in memory
0x08
Clear Memory – Clears all data in memory and resets the receiver back to factory defaults
z
102---SetDGPSPort
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. When a valid message
is received, the parameters are stored in battery-backed SRAM and the receiver restarts using the saved parameters.
Table 5.2-6 contains the input values for the following example:
Set DGPS Port to be 9600,8,N,1.
$PSRF102,9600,8,1,0*12
Table 5.2-6 Set GPS Port Data Format
Name
Example
Units
Description
Message ID
$PSRF102
PSRF102 protocol header
Baud
9600
4800,9600,19200,38400
DataBits
8
8,7
StopBits
1
0,1
Page 9/17
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Parity
0
Checksum
*12
0=None, 1=Odd, 2=Even
<CR><LF>
End of message termination
Note: RTCM is not supported.
z
103---Query/Rate Control
This command is used to control the output of standard NMEA messages GGA, GLL, GSA, GSV, RMC, and VTG.
Using this command message, standard NMEA messages may be polled once, or setup for periodic output. Checksums
may also be enabled or disabled depending on the needs of the receiving program. NMEA message settings are saved in
battery-backed memory for each entry when the message is accepted.
Table 5.2-7 contains the input values for the following example:
1. Query the GGA message with checksum enabled
$PSRF103,00,01,00,01*25
2. Enable VTG message for a 1 Hz constant output with checksum enabled
$PSRF103,05,00,01,01*20
3. Disable VTG message
$PSRF103,05,00,00,01*21
Table 5.2-7 Query/Rate Control Data Format (See example 1)
Name
Example
Units
Message ID
$PSRF103
PSRF103 protocol header
Msg
00
See Table 5.2-8
Mode
01
0=SetRate, 1=Query
Rate
00
CksumEnable
01
Checksum
*25
seconds
Description
Output – off=0, max=255
0=Disable Checksum, 1=Enable Checksum
<CR><LF>
End of message termination
Table 5.2-8 Messages
Description
Value
0
GGA
1
GLL
2
GSA
3
GSV
4
RMC
5
VTG
6
MSS (If internal beacon is supported)
Page 10/17
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z
7
Not defined
8
ZDA (if 1PPS output is supported)
9
Not defined
104---LLANavigationInitialization
This command is used to initialize the Evaluation Receiver by providing current position (in latitude, longitude, and
altitude coordinates), clock offset, and time. This enables the receiver to search for the correct satellite signals at the
correct signal parameters. Correct initialization parameters enable the receiver to acquire signals quickly.
Table 5.2-9 contains the input values for the following example:
Start using known position and time.
$PSRF104,37.3875111,-121.97232,0,96000,237759,1946,12,1*07
Table 5.2-9 LLA Navigation Initialization Data Format
Name
Example
Units
Description
Message ID
$PSRF104
Lat
37.3875111
degrees
Latitude position (Range 90 to –90)
Lon
-121.97232
degrees
Longitude position (Range 180 to –180)
Alt
0
meters
Altitude position
ClkOffset
96000
Hz
Clock Offset of the Evaluation Receiver1
TimeOfWeek
237759
seconds
GPS Time Of Week
WeekNo
1946
Extended GPS Week Number (1024 added)
ChannelCount
12
Range 1 to 12
ResetCfg
1
See Table 5.2-10
Checksum
*07
PSRF104 protocol header
<CR><LF>
End of message termination
1. Use 0 for last saved value if available. If this is unavailable, a default value of 96000 is used.
Table 5.2-10 Messages
Hex
z
Description
0x01
Hot Start – All data valid
0x02
Warm Start – Ephemeris cleared
0x03
Warm Start (with Init) – Ephemeris cleared,
initialization data loaded
0x04
Cold Start – Clears all data in memory
0x08
Clear Memory – Clears all data in memory
and resets receiver back to factory defaults
105---Development Data On/Off
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Use this command to enable development data information if you are having trouble getting commands accepted. Invalid
commands generate debug information that enables you to determine the source of the command rejection. Common
reasons for input command rejection are invalid checksum or parameter out of specified range.
Table 5.2-11 contains the input values for the following example:
1. Debug On
$PSRF105,1*3E
2. Debug Off
$PSRF105,0*3F
Table 5.2-11 Development Data On/Off Data Format
Name
Example
Units
Message ID
$PSRF105
PSRF105 protocol header
Debug
1
0=Off, 1=On
Checksum
*3E
<CR><LF>
z
Description
End of message termination
106---Select Datum
$PSGPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed (ECEF)
coordinate system. Results may be converted to an earth model (geoid) defined by the selected datum. The default datum
is WGS 84 (World Geodetic System 1984) which provides a worldwide common grid system that may be translated into
local coordinate systems or map datums. (Local map datums are a best fit to the local shape of the earth and not valid
worldwide.)
Table 5.2-12 contains the input values for the following example:
Datum select TOKYO_MEAN
$PSRF106,178*32
Table 5.2-12 Development Data On/Off Data Format
Name
Example
Units
Description
Message ID
$PSRF106
PSRF106 protocol header
Datum
178
21=WGS84
178=TOKYO_MEAN
179=TOKYO_JAPAN
180=TOKYO_KOREA
181=TOKYO_OKINAWA
Checksum
<CR><LF>
*32
End of message termination
Page 12/17
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6
Pin assignment and descriptions
Pin # Name
Type Description
1
GND
P
Ground
2
GND
P
Ground
3
GND
P
Ground
O
LED indicator. See Fig. 6-1.
Internal pulled down via 100KΩ resistor.
4
LED
Default input at reset.
5
TX
O
Serial data output
6
RX
I
Serial data input
7
VCC
P
DC supply voltage
8
VBACKUP
P
Backup battery supply voltage.
This pin must be powered to enable the module.
Page 13/17
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Fig. 6-1 Indicator of position fixed condition of LS20025
7
DC & Temperature characteristics
7.1 Absolute maximum ratings
Parameter
Symbol
Ratings
Units
VCC
6.5
V
Input Backup Battery Voltage
VBACKUP
7
Operating Temperature Range
Topr
-20 ~ 65
V
℃
Storage Temperature Range
Tstg
-40 ~ 80
℃
Input Voltage
7.2 DC Electrical characteristics
Parameter
Input Voltage
Symbol
Min.
Typ.
Max.
Units
VCC
3.0
3.3
4.2
V
6.0
V
66
mA
Input Backup Battery Voltage VBACKUP
1.6
44(1)
Supply Current
Iss
High Level Input Voltage
VI H
2.1
3.6
V
Low Level Input Voltage
VI L
-0.3
0.8
V
High Level Input Current
I IH
-10
60
uA
Low Level Input Current
I IL
-10
60
uA
High Level Output Voltage
VOH
2.0
Low Level Output Voltage
VOL
High Level Output Current
I OH
V
0.73
2
V
mA
Page 14/17
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Low Level Output Current
1.
I OL
2
mA
Measured when position fix is available and input voltage is 3.3V.
7.3 Temperature characteristics
Parameter
8
Symbol
Min.
Typ.
Max.
Operating Temperature
Topr
-20
-
65
Units
℃
Storage Temperature
Tstg
-40
25
80
℃
Mechanical specification
8.1 Outline dimensions
Page 15/17
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LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
¬ 886-2-8698-3699
ßwww.locosystech.com
8.2 Recommended land pattern dimensions
Page 16/17
© 2006 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi City, Taipei County 221, Taiwan
℡ 886-2-8698-3698
¬ 886-2-8698-3699
ßwww.locosystech.com
Document change list
Revision 1.0
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First release on May 11, 2007
Revision 1.1
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Added watermark on Fig 3-1
Revised figure in the page 15.
Page 17/17
© 2006 LOCOSYS Technology Inc.
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