RGM-3550LP User Manual
RGM-3550LP User Manual
Version 1.3
2008/11/19
This document contains information highly confidential to RoyalTek Company
LTD (RoyalTek). It is provided for the sole purpose of the business discussions
between supplier and RoyalTek and is covered under the terms of the
applicable Non-Disclosure Agreements. Disclosure of this information to other
parties is prohibited without the written consent of RoyalTek.
Prepared by RoyalTek Company LTD.
4F, No.188 Wen Hwa 2nd Rd., Kuei Shan,
Tao Yuan 33383, Taiwan
TEL: 886-3-3960001
FAX: 886-3-3280976
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RGM-3550LP User Manual
Content
1. Introduction...............................................................................................4
2. RGM-3550LP Picture and Pin Definition...................................................5
3. RGM-3550LP System Block Diagram.......................................................6
4. RGM-3550LP Technique Specification......................................................7
5. Mechanical Layout..................................................................................10
6. How to Assemble/Fix RGM-3550LP ....................................................... 11
7. Software Specification and NMEA Protocol ............................................12
8. Package Specification and Order Information.........................................18
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RGM-3550LP User Manual
RoyalTek GPS Module: RGM-3550LP Operational Manual
1. Introduction
RoyalTek RGM-3550LP smart antenna GPS module (patch antenna embedded and
external antenna supported) is inherited from RGM-3550, but lower power
consumption than RGM-3550. The smart antenna GPS module is powered by SiRF
Star III technology and RoyalTek proprietary navigation algorithm that providing you
more stable navigation data.
The 6-pin connector design is the easiest and convenient solution to be embedded in
a portable device and receiver like PND, GPS mouse, car holder, personal locator,
speed camera detector and vehicle locator. The excellent sensitivity of RGM-3550LP
gets the great performance when going though the urban canyon and foliage.
Product Features
—
—
—
—
20 parallel channels.
-159 dBm high GPS sensitivity.
Excellent sensitive for urban canyon and foliage environments.
Operable from 3.3V, average tracking current is [email protected] and average
Acquisition current is 50mA.
—
—
—
—
—
—
—
—
—
—
—
6 pin Wire-to-Board (WTB) connector type.
GPS status light output.
TCXO design.
0.1 second reacquisition time.
Dimension is 35±0.3(L)x 31±0.3(W)x 8.55/6.55±0.5(H) mm.
Weight ≦16.5g.
NMEA-0183 compliant protocol/custom protocol.
Enhanced algorithm for navigation stability
SBAS (WAAS, EGNOS and MSAS) support and the default SBAS is enable
Lead-Free
Backup battery (installed)
Product Applications
—
—
—
—
—
Personal Navigation Device including GPS PDA and GPS Handheld
GPS receiver including GPS mouse and Bluetooth GPS receiver
Personal positioning and navigation
Marine navigation
Timing application
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2. RGM-3550LP Picture and Pin Definition
Pin 1
Pin 6
31 ±0.3 mm
35 ± 0.3mm
5
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3. RGM-3550LP System Block Diagram
System block diagram description:
„
„
„
„
Patch antenna with 1 Stage LNA
4Mega bits flash memory on chip
MMCX External Antenna Supported
6 pin I/O pin (see page 7, Interface pin definition)
LNA
GPS Patch Antenna
SIRF GSC3F
6 Pin I/O
with 4M Flash
MMCX Switch
SAW
RF frontend +Base-band
Connector
Processor
External Antenna
TCXO
XTAL
6
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4. RGM-3550LP Technique Specification
No
Function
Specification
GPS receiver
1
2
3
4
5
6
7
8
9
9
Chipset
SiRF GSC3F/LP single chipset
Frequency
Code
L1 1575.42MHz.
C.A. Code.
Channels
20.
Chipset Sensitivity
Cold start
-159dBm (tracking)
35 sec@ open sky
Warm start
Hot start
35 sec@ open sky
1 sec @ open sky
Reacquisition
Position accuracy
0.1sec typical
10meters at 2D RMS.
18000 m
10 Maximum altitude
11 Maximum velocity
12 Trickle power mode
13 Update rate
514 m/s
Duty cycle ≦ 34%. (Variable)
Continuous operation: 1Hz
It shall be able to be tested by SiRF test mode IV and
single channel simulator.
It shall store the protocol setup in the SRAM memory.
14 Testability
15 Protocol setup
Interface
16 I/O Pin
6 pin (see page 7 about pin definition)
Mechanical requirements
17 Dimension
35±0.3(L)x 31±0.3(W)x 8.55±0.5(H) mm
≦16.5g
18 Weight
Power consumption
19 Vcc
DC 3.3 ±5%
20 Current
Acquisition: 50mA (typical) Tracking: 45mA (typical)
Average current 37mA. (300ms on /700ms off)
3.3mAhr Li-Ion rechargeable battery. Battery life at full
charge is ≥ 7 days.
21 Trickle power mode
22 SRAM backup battery
Environment
23 Operating temperature
-40 ~ +85℃(exc ept for SRAM ba ttery ba c kup -20
to +60 degree C elsius)
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24 Storage temperature
-40 ~ +85℃(exc ept for SRAM ba ttery ba c kup -40
to +60 degree C elsius)
≦95%
25 Humidity
26 Lead Free
Yes
External Antenna RF Input
27
2.85V ± 0.5%
30mA (max)
MMCX
Drive Output Voltage
28 Drive Output Current
29 Connector Type
Interface Pin definition (VDD=2.85V±2%)
1. 2. 3 . 4. 5. 6
EXT Ant
RF IN
Pin # Signal Name I/O
Description
Serial port A
Serial port A
Ground
Characteristics
VIH ≥ 0.7*VDD
VOH ≥ 0.75*VDD
Reference Ground
DC +3.3V±5%
VIL ≤ 0.3*VDD
1
2
3
4
RX
I
VOL ≤ 0.25VDD
TXA
GND
VCC
O
G
I
DC Supply
Voltage input
GPS Status
Boot mode
External
VOH ≥ 0.75*VDD
VOL ≤ 0.25VDD
5
GPS Status O
Boot select I
External
VIH ≥ 0.7*VDD
VIL ≤ 0.3*VDD
6
EXT
Ant
RFIN
VOUT = 2.85V ± 0.5%
Antenna RF IN Antenna RF
RF Input Input
IOut = 30mA(Max)
„
„
„
VCC (+3.3V DC power Input)
this is the main DC power supply input pin. It provides voltage to module.
GND
Reference Ground Plane of RGM-3550.
Boot select
set this pin to high for programming flash.
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„
RX
This is the main receiver channel and is used to receive software commands to
the board from SIRFdemo software or from user written software.
PS: Pull up if not used.
„
„
TX
This is the main transmitting channel and is used to output navigation and
measurement data to SiRFdemo or user written software.
GPS Status
GPS Status Pin can be connected to a LED to indicate the status of GPS signal
1. Solid: Power ON/ Tracking for Satellite
2. Blinking: 3D Fix Found
GPS status light indicating
Power off
LED off
VoL:0.71(Max)
VoH: 2.13V(min)
VoH: 2.13V(min) &
VoL:0.71(Max)
Power on/search for satellite, voltage is high
3D fix found, voltage is high/low, remain 1
second each
LED solid
LED blinking
„
External Antenna RF Input
This is the MMCX RF Connector for External Active Antenna signal input
External Active Antenna Spec. Suggestion
1. Drive Output Voltage:
VOUT = 2.85V ± 0.5%
2. Drive Output Current: IOut = 30mA(Max)
3. LNA Gain: 20~26dB
4. LNA Noise Figure: <1.5dB
How to use RGM-3550LP in 5V main board
The power supply of RGM-3550LP is 3V. If customer would like use RGM-3550LP in
5V system, RoyalTek suggest customer use linear regulator (from 5V to 3.3V) on
customer main board. We could help check the circuit if providing regulator
specification.
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5. Mechanical Layout
25x25x4mm patch antenna
25x25x2mm patch antenna
10
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6. How to Assemble/Fix RGM-3550LP
Below is our recommendation to assemble/fix up RGM-3550LP GPS module
on the customer board or device case.
Hole
Hole
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7. Software Specification and NMEA Protocol
Software Specification
-
-
-
Standard SiRF firmware for SSIII (GSW3 & SiRFLoc 3)
Upload firmware
GPS Firmware
GPS Utility
RGM-3550LP [GSW3][SBAS GGA(1), GSA(1), GSV(1),
RMC(1) 9600 GPS Firmware, version 2.1.0.123 (default)
A GPS performance diagnostic utility is required
C/NO, TTFF
-
-
-
-
WAAS
Enable
GPS status
See GPS status light indicating specification
NMEA V3.0 Protocol
Its output signal level is TTL: 9600bps (default), 8 bit data, 1 stop bit and no parity. It supports
the following NMEA-0183
Messages: GGA, GLL, GSA, GSV, RMC and VTG.
NMEA Output Messages: the Engine board outputs the following messages as shown in Table
1:
Table 1 NMEA-0183 Output Messages
NMEA Record
GGA
Description
Global positioning system fixed data
Geographic position – latitude / longitude
GNSS DOP and active satellites
GLL
GSA
GSV
GNSS satellites in view
RMC
Recommended minimum specific GNSS data
Course over ground and ground speed
VTG
GGA-Global Positioning System Fixed Data
Table 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
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Table 2 GGA Data Format
Name
Message ID
Example
Units
Description
GGA protocol header
hhmmss.sss
$GPGGA
UTC Position
Latitude
161229.487
3723.2475
ddmm.mmmm
N/S Indicator
Longitude
N
N=north or S=south
Dddmm.mmmm
12158.3416
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
W
1
E=east or W=west
See Table 2-1
07
1.0
9.0
Range 0 to 12
Horizontal Dilution of Precision
MSL Altitude
meters
Units
M
M
meters
meters
meters
Geoid Separation
Units
Age of Diff. Corr.
second Null fields when DGPS is not
used
Diff. Ref. Station ID
Checksum
0000
*18
＜CR＞＜LF＞
End of message termination
Table 3 Position Fix Indicators
Value
Description
0
1
2
3
Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
GPS PPS Mode, fix valid
GLL-Geographic Position –Latitude/Longitude
Table 3 contains the values of the following
Example: $GPGLL, 3723.2475, N, 12158.3416, W, 161229.487, A*2C
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Table 3 GLL Data Format
Name
Message ID
Latitude
Example
$GPGLL
3723.2475
N
Units
Description
GLL protocol header
ddmm.mmmm
N/S Indicator
Longitude
N=north or S=south
Dddmm.mmmm
12158.3416
W
E/W Indicator
UTC Position
Status
E=east or W=west
hhmmss.ss
161229.487
A
A=data valid or V=data not valid
Checksum
＜CR＞＜LF＞
*2C
End of message termination
GSA-GNSS DOP and Active Satellites
Table 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 4 GSA Data Format
Name
Message ID
Mode 1
Example
Units
Description
GSA protocol header
$GPGSA
A
3
See Table 4-2
Mode 2
See Table 4-1
Satellite Used
Satellite Used
….
07
02
Sv on Channel 1
Sv on Channel 2
….
Satellite Used
PDOP
Sv on Channel 12
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
1.8
1.0
1.5
*33
HDOP
VDOP
Checksum
＜CR＞＜LF＞
End of message termination
Table 4-1 Mode 1
Value
Description
1
2
3
Fix not available
2D
3D
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Table 4-2 Mode 2
Value
M
Description
Manual-forced to operate in 2D or 3D mode
Automatic-allowed to automatically switch 2D/3D
A
GSV-GNSS Satellites in View
Table 5 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 5 GGA Data Format
Name
Message ID
Number of
Example
$GPGSV
2
Units
Description
GSV protocol header
Range 1 to 3
Messages1
Messages Number1
Satellites in View
Satellite ID
1
07
07
79
048
42
Range 1 to 3
Channel 1(Range 1 to 32)
Elevation
degrees Channel 1(Maximum 90)
degrees Channel 1(True, Range 0 to 359)
dBHz Range 0 to 99, null when not
tracking
Azimuth
SNR (C/No)
….
….
Satellite ID
Elevation
Azimuth
SNR (C/No)
27
27
Channel 4(Range 1 to 32)
degrees Channel 4(Maximum 90)
degrees Channel 4(True, Range 0 to 359)
dBHz Range 0 to 99, null when not
tracking
138
42
Checksum
*71
＜CR＞＜LF＞
End of message termination
1Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC-Recommended Minimum Specific GNSS Data
Table 6 contains the values of the following example:
$GPRMC, 161229.487, A, 3723.2475, N, 12158.3416, W, 0.13, 309.62, 120598, ,*10
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Table 6 GGA Data Format
Name
Message ID
UTC Position
Status
Example
$GPRMC
161229.487
A
Units
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
Latitude
3723.2475
N
N/S Indicator
Longitude
N=north or S=south
dddmm.mmmm
12158.3416
W
E/W Indicator
Speed Over Ground
E=east or W=west
0.13
knots
Course Over
Ground
309.62
120598
*10
degrees True
Date
ddmmyy
degrees E=east or W=west
Magnetic Variation
Checksum
＜CR＞＜LF＞
End of message termination
VTG-Course Over Ground and Ground Speed
Table 7 contains the values of the following example:
$GPVTG, 309.62, T, , M, 0.13, N, 0.2, K*6E
Table 7 VTG Data Format
Name
Message ID
Course
Example
Units
Description
VTG protocol header
$GPVTG
309.62
T
degrees Measured heading
True
Reference
Course
degrees Measured heading
Magnetic
Reference
Speed
M
0.13
N
knots Measured horizontal speed
Knots
Units
Speed
0.2
K
km/hr Measured horizontal speed
Kilometer per hour
Units
Checksum
＜CR＞＜LF＞
*6E
End of message termination
16
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GPS Receiver User’s Tip
1. GPS signal will be affected by weather and environment conditions, thus suggest to use the
GPS receiver under less shielding environments to ensure GPS receiver has better receiving
performance.
2. When GPS receiver is moving, it will prolong the time to fix the position, so suggest to wait for
the satellite signals to be locked at a fixed point when first power-on the GPS receiver to
ensure to lock the GPS signal at the shortest time.
3. The following situation will affect the GPS receiving performance:
a. Solar control filmed windows.
b. Metal shielded, such as umbrella, or in vehicle.
c. Among high buildings.
d. Under bridges or tunnels.
e. Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
f. Bad or heavy cloudy weather.
4. If the satellite signals can not be locked or encounter receiving problem (while in the urban
area), the following steps are suggested:
a. Please plug the external active antenna into GPS receiver and put the antenna on
outdoor or the roof of the vehicle for better receiving performance.
b. Move to another open space or reposition GPS receiver toward the direction with less
blockage.
c. Move the GPS receiver away from the interferences resources.
d. Wait until the weather condition is improved.
5. While a GPS with a backup battery, the GPS receiver can fix a position immediately at next
power-on if the build-in backup battery is full-recharged.
Copyright © 2007-2008, RoyalTek Company Ltd.
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8. Package Specification and Order Information
1
2
3
Copyright © 2007-2008, RoyalTek Company Ltd.
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