Transcript
Modefone PRODUCT USER MANUAL GPS ENGINE BOARD S2525
Rev1.0
modefone Company 深圳市福田区中航路新亚洲电子商城二期三楼 N3A059 Tel: +86-755 – 82565388
Fax: +86-755 82565388
E-mail :
[email protected] Website: www.modefone.com.cn
GPS ENGINE BOARD: S2525
Specification: General Chipset Frequency C/A code Channels
SiRF StarⅢ L1, 1575.42 MHz 1.023 MHz chip rate 20 channel all-in-view tracking
Accuracy Position
10 meters, 2D RMS 5 meters, 2D RMS, WAAS enabled 0.1 m/s 1us synchronized to GPS time
Velocity Time
Datum Default
WGS-84
Acquisition Time Reacquisition Hot start Warm start Cold start
0.1 sec., average 1 sec., average 35 sec., average 37 sec., average
Dynamic Conditions Altitude Velocity Acceleration Jerk
18,000 meters (60,000 feet) max 515 meters /second (1000 knots) max Less than 4g 20m/sec3
Power Main power input Power consumption
3.2~5.0V DC input 28mA (Avg Current)
Interface Dimension Baud rate Output message Antenna
25.4mm*25.4mm*3mm 4,800 to 57,600 bps adjustable SiRF binary or NMEA 0183 GGA, GSA, GSV, RMC Right-hand circular polarized
Environmental Operating Temp
Modefone
-30ºC to +85ºC
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 Pin Assignment
Pin description Pin No.
Pin Name
Type
1.
VCC
Power Input
2.
GND
GND
3.
BOOTSEL
I
Select download flash mode or run mode. HIGH:Flash Download;LOW:GPS working.
4.
RXA
I
This is the main receive channel for receiving software commands to the engine board form SiRF demo software or from user written software.
5.
TXA
O
This is the main transmits channel for outputting navigation and measurement data to user’s navigation software or user written.Output TTL level,0V~2.85V.
6.
TXB
O
Auxiliary Serial UART interface, unused
7.
RXB
I
Auxiliary Serial UART interface, unused
8.
NC
9.
RF_ON
O
10.
GND
GND
Ground.
11.
GND
GND
Ground.
12.
GND
GND
Ground.
13.
GND
GND
Ground.
14.
GND
GND
Ground.
15.
GND
GND
Ground.
16.
GND
GND
Ground.
17.
RF_IN
I
18.
GND
GND
19.
V_ANT_IN
Power Input
20.
VCC_RF
Power Output
Modefone
Description Apply 3.2~5.0V DC for Main power Ground.
NC
mobile:
13410689618
This pin indicates state of RF voltage
GPS Signal input, 50Ω@1.57542GHz,2.85V active antenna Bias output. Ground. Avtive Antenna Bias voltage Supply Antenna Bias voltage:DC+2.85V±2%,Current＜ tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 30mA 21.
V_BAT
Power Input
Backup voltage supply:DC+1.5~+5.0V,Cuurent≤10uA
22.
RESET
I
23.
NC
NC
24.
NC
NC
25.
NC
NC
26.
NC
NC
27.
NC
NC
28.
NC
NC
29.
1PPS
O
30.
GND
GND
External Reset,active low
1 Pulse Per Second Ground
Definition of Pin assignment y VCC This is the main DC power supply input pin for GPS system. It provides voltage to module.
y GND GND provides the ground for the board.Connect all grounds.
y BOOTSEL Set this pin to high for programming flash. Please set NC during operating Mode.
y RXA This is the main receiver channel and is used to receive software commands to the board from SIRFdemo software or from user written software.
y TXA This is the main transmitting channel and is used to output navigation and measurement data to SiRFdemo or user written software.
y TXB Auxiliary Serial UART interface, unused.
y RXB Auxiliary Serial UART interface, unused.
y RF_ON This pin indicates state of RF voltage.
y RF_IN This pin receives GPS analog signal. The line on the PCB between the antenna(or antenna connector) has to be a controlled impedance Microstrip line at 50Ω.
y V_ANT_IN This pin is reserved as external DC power supply input for active antenna. If using 2.85V active antenna, pin 20(VCC_RF) has to be connected to pin 19. If using 3.3V or 5V active antenna ,this pin has to be connected to 3.3V or 5V power supply. Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 y VCC_RF This pin can provide power
[email protected] for active antenna.
y V_BAT This is the battery backup input that powers the SRAM and RTC when main power is removed. Typical current draw is 10uA. Without an external backup battery or super cap, the TMP will execute a cold start after every power on. To achieve the faster start-up offered by a hot or warm start, either a battery backup must be connected or a super cap installed.
y Reset This pin provides an active-low reset input to the board. It causes the board to reset and start searching for satellites. This pin should be open If not utilized.
y 1PPS This pin provides one pulse-per-second output from the board, which is synchronized to GPS time. This is not available in Trickle Power mode.
Block Diagram
Output NMEA Messages Its output signal level is TTL: 4800 bps (default), 8 bit data, 1 stop bit and no parity. Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 It supports the following NMEA-0183 Messages: GGA, GSA, GSV and RMC NMEA Output Messages: the Engine board outputs the following messages as shown in Table 1-1: Table 1-1 NMEA-0183 Output Messages NMEA Record
Descriptiom
GGA
Global positoning system fixed data. Time, Position and fix related data
GSA
GNSS DOP and active satellites
GSV
GNSS satellites in view
RMC
Recommended minimum specific GNSS data
GGA-Global Positioning System Fixed Data Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA message description. Table 1-2 contains the values of the following example: $GPGGA, 161229.487, 3723.2475, N, 12158.3416, W, 1, 07, 1.0, 9.0, M, , , ,0000*18 Table 1-2 GGA Data Format Name
Example
Units
Descripion
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
E/W Indicator
W
E=east or W=west
Position Fix Indicator
1
See Table 1-3
Satellites Used
07
Range 0 to 12
HDOP
1.0
Horizontal Dilution of Precision
MSL Altitude
9.0
meters
Units
M
meters
Geoid Separation
meters
Units
M
meters second
Age of Diff. Corr.
Null fields when DGPS is not used
Diff. Ref. Station ID
0000
Checksum
*18 End of message termination
＜CR＞＜LF＞
Table 1-3 Position Fix Indicators Value
Description
0
Fix not available or invalid
1
GPS SPS Mode, fix valid
Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 2
Differential GPS, SPS Mode, fix valid
3-5
Not Supported
6
Dead Reckoning Mode, fix valid
GSA-GNSS DOP and Active Satellites Table 1-4 contains the values of the following example: $GPGSA, A, 3, 07, 02, 26, 27, 09, 04, 15, , , , , , 1.8,1.0,1.5*33 Table 1-4 GSA Data Format Name
Example
Units
Descripion
Message ID
$GPGSA
GSA protocol header
Mode 1
A
See Table 1-5
Mode 2
3
See Table 1-6
Satellite Used
07
Sv on Channel 1
Satellite Used
02
Sv on Channel 2
…
…
Satellite Used
Sv 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 End of message termination
＜CR＞＜LF＞
Table 1-5 Mode 1 Value
Description
M
Manual-forced to operate in 2D or 3D mode
A
2D Automatic--allowed to automatically switch 2D/3D Table 1-6 Mode 2 Value
Description
1
Fix not available
2
2D (<4 SVs used)
3
3D (>3 SVs used)
GSV-GNSS Satellites in View Table 1-7 contains the values of the following example: $GPGSV, 2, 1, 07, 07, 79, 048, 42, 02, 51, 062, 43, 26, 36, 256, 42, 27, 27, 138,42*71 $GPGSV, 2, 2, 07, 09, 23, 313, 42, 04, 19, 159, 41, 15, 12, 041, 42*41 Table 1-7 GSV Data Format Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 Name
Example
Message ID Number of Messages1 Messages Number
1
Units
Descripion
$GPGSV
GSV protocol header
2
Range 1 to 3
1
Range 1 to 3
Satellites in View
07
Satellite ID
07
Elevation
79
degrees
Channel 1(Maximum 90)
Azimuth
048
degrees
Channel 1(True, Range 0 to 359)
SNR (C/No)
42
dBHz
Range 0 to 99, null when not tracking
Channel 1(Range 1 to 32)
…
…
Satellite ID
27
Channel 4(Range 1 to 32)
Elevation
27
degrees
Channel 4(Maximum 90)
Azimuth
138
degrees
Channel 4(True, Range 0 to 359)
SNR (C/No)
42
dBHz
Range 0 to 99, null when not tracking
Checksum
*71 End of message termination
＜CR＞＜LF＞
1. Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC-Recommended Minimum Specific GNSS Data Note—Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA message description. Table 1-8 contains the values of the following example: $GPRMC, 161229.487, A, 3723.2475, N, 12158.3416, W, 0.13, 309.62, 120598, ,*10 Table 1-8 RMC Data Format Name
Example
Units
Descripion
Message ID
$GPRMC
RMC protocol header
UTC Position
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
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
Speed Over Ground
0.13
knots
Course Over Ground
309.62
degrees
Date
120598
Magnetic Variation East/West Indicator
ddmmyy degrees
1
Mode Modefone
True
mobile:
E
E=east or W=west
A
A=Autonomous, D=DGPS, E=DR
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525 Name
Example
Checksum
Units
Descripion
*10 End of message termination
＜CR＞＜LF＞
1. This GPS receiver does not support magnetic declination. All “course over ground” data are geodetic WGS84 directions.
Recommend Layout PAD
Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
GPS ENGINE BOARD: S2525
Mechanical Dimensions
Modefone
mobile:
13410689618
tel: 0755 82565388
e mail:
[email protected]
