REB-3571LP User Manual
Figure List ................................................................................................................................ II
Table List ................................................................................................................................. III
1
2
Introduction ..................................................................................................................... 4
1.1
Product applications ..................................................................................... 4
1.2
Product Picture .............................................................................................. 5
1.3
Gstar-89LP Series Block Diagram ................ ............................................. 7
1.4
Gstar-89LP Technique Specification............. ............................................ 8
1.5
Application Circuit......................................................................................... 9
1.6
Recommended layout PAD..........................................................................11
1.7
Mechanical Layout ...................................................................................... 12
1.8
Gstar-89LP-Test Software Specification......... ......................................... 12
1.9
Hardware interface ...................................................................................... 13
Software Interface ......................................................................................................... 17
2.1
3
NMEA V3.0 Protocol .................................................................................... 17
2.1.1
GGA-Global Positioning System Fixed Data ................................... 17
2.1.2
GLL-Geographic Position –Latitude/Longitude............................... 18
2.1.3
GSA-GNSS DOP and Active Satellites .............................................. 19
2.1.4
GSV-GNSS Satellites in View ............................................................. 19
2.1.5
RMC-Recommended Minimum Specific GNSS Data ....................... 20
2.1.6
VTG-Course Over Ground and Ground Speed ................................ 21
GPS Receiver User’s Tip .............................................................................................. 22
3.1
Package Specification and Order Information ......................................... 23
3.2
Lead-Free Standard Reflow Profile............................................................ 23
4
Contact Information Section........................................................................................ 24
5
Revision History............................................................................................................ 24
I
REB-3571LP User Manual
Figure List
Figure 1-1 Gstar-89LP Front View ................... ............................................................ 5
Figure 1-2 Gstar-89LP Interface Board Front View... ................................................. 5
Figure 1-3 Evaluation Kit Front View............................................................................. 7
Figure 1-4 System Block Diagram ................................................................................. 7
Figure 1-5 Application Circuit Reference...................................................................... 9
Figure 1-6 Recommended Layout Pad.........................................................................11
Figure 1-7 Mechanical Layout ...................................................................................... 12
Figure 1-8 Hardware Interface...................................................................................... 13
Figure 3-1 Package Specifications .............................................................................. 23
II
REB-3571LP User Manual
Table List
Table 1-1 The interface board pin definition................................................................. 5
Table 1-2 Technical Specifications ................................................................................ 8
Table 1-3 Definition of Pin assignment ....................................................................... 13
Table 2-1 NMEA-0183 Output Messages ..................................................................... 17
Table 2-2 GGA Data Format .......................................................................................... 17
Table 2-3 Position Fix Indicators ................................................................................. 18
Table 2-4 GLL Data Format ........................................................................................... 18
Table 2-5 GSA Data Format .......................................................................................... 19
Table 2-6 Mode 1............................................................................................................ 19
Table 2-7 Mode 2............................................................................................................ 19
Table 2-8 GGA Data Format .......................................................................................... 20
Table 2-9 GGA Data Format .......................................................................................... 20
Table 2-10 VTG Data Format......................................................................................... 21
III
REB-3571LP User Manual
1 Introduction
Gstar-GP S-GS-89.LP low power and small form factor
board is the newest
generation of RoyalTek GPS module. The module is powered by latest SiRF Star III
single chip and RoyalTek proprietary navigation technology that provides you with
stable and accurate navigation data. The smallest form factor and miniature design is
the best choice to be embedded in a device such as portable navigation device,
personal locator, speed camera detector and vehicle locator.
Product Features
20 parallel channels
SMT type with stamp holes
TCXO design
0.1 second reacquisition time
Small form factor with embedded SiRF Star III single chip technology.
NMEA-0183 compliant protocol/customize protocol.
Enhanced algorithm for navigation stability
Excellent sensitive for urban canyon and foliage environments.
DGPSBAS (WAAS, EGNOS and MSAS) support
Auto recovery while RTC crashes
Trickle power supported
Build-in LNA and saw filter
1.1 Product applications
Automotive navigation
Personal positioning and navigation
Marine navigation
Timing application
4
1.2 Product Picture
GstarGS-89
Pin16
Pin 15
Pin 30
Pin 1
Figure 1-1 GstarGS-89 Front View
Figure 1-2 REB-3571LP Interface Board Front View
Table 1-1 The interface board pin definition
PIN
1
VCC
V_GPS_3V3
VCC
2
GND
GND
GND
3
Bootselect
Bootselect
Bootselect
4
RXA
RXA
RXA
5
TXA
TXA
TXA
6
TXB
TXB
TXB
7
RXB
RXB
RXB
8
GPIO14
N.C.
GPIO14
5
9
RF-ON
RF-ON
RF-ON
10
GND
GND
GND
11
GND
N.C.
GND
12
GND
N.C.
GND
13
GND
GND
GND
14
GND
N.C.
GND
15
GND
GND
GND
16
GND
GND
GND
17
RF-IN
GPS_RF_IN
RF-IN
18
GND
GND
GND
19
V-ANT
V-ANT_IN
V-ANT
20
VCC-RF
VCC_RF_OUT
VCC-RF
21
V-BAT
V_RTC_3V3
V-BAT
22
RESET-IN
RESET
RESET-IN
23
GPIO10
N.C.
GPIO10
24
GPIO1
N.C.
GPIO1
25
GPIO5
GPIO4
GPIO4
26
GPIO0
GPIO0
GPIO0
27
GPIO13
N.C.
GPIO13
28
GPIO15
N.C.
GPIO15
29
PPS
PPS
PPS
30
GND
GND
GND
31
NO PAD
N.C.
NO PAD
RoyalTek Evaluation Kit REV-2000 for Gstar-GS89(Com
(Please refer to RoyalTek Evaluation Kit REV-2000 for GstarGS89 Operational Manual
for more information)
Figure 1-3 Evaluation Kit Front View
6
1.3 GstarGS-89 Series Block Diagram
Gstar-GS89 engine board consists of SiRF star III singl e chipset technology; 4Mbits
flash memory, and proprietary software. The system is described as follows.
a. External antenna.
b. 4 Mega bits flash memory
c. 30 pin I/O pin
Figure 1-5 System Block Diagram
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REB-3571LP User Manual
1.4 GstarGS-89 Technique Specification
Impedance:
:50Ω
Ω
Table 1-2 Technical Specifications
No
Function
Specification
GPS receiver
1
Chipset
2
Frequency
SiRF Star III, GSC3f/LP
(Digital, RF in a single package)
L1 1575.42MHz.
3
Code
C.A. Code.
4
Channels
20 parallel
5
Sensitivity (Acquisition)
It shall show C/No ≧ 40 dB-Hz when external power
= -130dBm.
6
Chip set cold start
35s @ open sky (Typical)
7
Chip set warm start
35s @ open sky (Typical)
8
Chip set hot start
1s @ open sky (Typical)
9
Reacquisition
less than 1s
10
Position accuracy
10meters at 2D RMS.
11
Maximum altitude
18000 m
12
Maximum velocity
514 m/s
13
Trickle power mode
Duty cycle ≦ 34%. (Variable)
14
Update rate
Continuous operation: 1Hz
15
Testability
It shall be able to be tested by SiRF test IV and single
channel simulator.
16
Protocol setup
It shall store the protocol setup in the SRAM memory.
17
DGPS
WAAS, EGNOS
Interface
18
LNA
15dB Gain. (Typical)
19
I/O Pin
30pin
Power consumption
21
Vcc
DC 3.3 ±5%
22
Current
Avg. Acquisition <50mA@3.3V(without ext. antenna)
Avg. Tracking<48mA@3.3V(without ext. antenna)
Environment
23
Temperature
Operating : -40 ~ 85℃
Storage : -40 ~ 85℃
24
Humidity
≦95%
8
REB-3571LP User Manual
1.5 Application Circuit
J1
RF MCX JACK
5 3
4
R1 0 ohm
R2 0 ohm
1
50 ohm Trace
C1
OPEN
2
C2
OPEN
+3.3V
+3.3V
U1
R7
0 ohm
RF_IN
R8
C7
0.1uF/X5R/16V
OPEN
V_RTC_3V3
RESET
GPS_IO10
GPS_IO1
GPS_IO4
GPS_IO0
GPS_IO13
GPS_IO15
GPS_PPS
+3.3V_BAT (Alway s)
1
3
C4
10uF /10V /Y 5V
2
D1
RB705D
U2
3V 3.3mAH
R6
470 ohm/ 5%
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
GND
RF_IN
GND
V_ANT_IN
VCC_RF_OUT
V_RTC_3V3
RESET
GPIO[10]
GPIO[1]
GPIO[4]
GPIO[0]
GPIO[13]
GPIO[15]
PPS
GND
GND
GND
GND
GND
GND
GND
RF_ON
GPIO[14]
RXB
TXB
TXA
RXA
Bootselect
GND
VCC_3V3
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R3
OPEN(10K)
RXB
RF_ON
GPS_IO14
R4
R5
220 RXB
220
GPS_Bootselect
SY STEM_TXB
SY STEM_RXB
SY STEM_RXA
SY STEM_TXA +3.3V
VCC_3V3
REB-3571LP
C5
0.1uF/X5R/16V
C6
10uF/Y 5V/10V
+
Figure 1-6 Application Circuit Reference
Note:
(1) Ground Planes:
These pin(2,10~16、18、30) should be connect to ground.
(2) Serial Interface:
(Ⅰ) The TXA pin is the serial output data (Default NMEA) .
(Ⅱ) The TXB pin is the serial output data (Default Null) .
(Ⅲ) The RXA pin is the serial input data (Default NMEA) .
(Ⅳ) The RXB pin is the serial input data (Default Null).
(3) Backup Battery:
When module is working, must to supply VCC_3V3(P1) and
V_RTC_3V3 (P21) power at the same time.
It’s recommended to connect a backup battery to V_RTC_3V3 pin.
In order to enable the warm start and hot start features of the GPS receiver.
If you use backup battery, should be add a bypassing capacitor (10uF) at
V_RTC_3V3 pin. It can reduce noise and increase the stability.
(4) RF_IN:
Connecting to the antenna has to be routed on the PCB. The transmission
line must to controlled impedance to connect RF_IN to the antenna or
antenna connector of your choice. (Impedance 50Ω)
(5) Power:
Connect VCC_3V3 pin to DC +3.3V. The power supply must add bypassing
capacitor (10uF and 0.1uF).It can reduce the Noise from power supply and
9
increase power stability.
(6) Active antenna bias voltage:
The VCC_RF_OUT pin (pin 20) is provide voltage 2.85V. If you use active
antenna, you can connect this pin to V_ANT_IN pin (pin 19) to provide bias
voltage of active antenna. The bias voltage will be through GPS_RF_IN pin
to provide active antenna bias voltage from Vcc_RF_OUT pin.
If your bias voltage of active antenna isn’t 2.85V, you can input bias voltage
to V_ANT_IN pin (pin 19).And input bias voltage of you need. The input
bias voltage will through GPS_RF_IN pin to provide active antenna bias
voltage from V_ANT_IN pin.
PS:
(1) The maximum power consumption of active antenna is about 85mW.
(2) The input gain ranges are 19~ 22dB.
(7) GPIO:
The GPIO pin is recommended to connect to serial resistance(220Ω),if use
the GPIO function.
If no use GPIO functions, it doesn’t connect anything.
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REB-3571LP User Manual
1.6 Recommended layout PAD
Figure 1-7 Recommended Layout Pad
11
REB-3571LP User Manual
1.7 Mechanical Layout
Figure 1-8 Mechanical Layout
1.8 GstarGS-89-Test Software Specification
No
Function
Specification
1
Clock offset
88000Hz≦量測值≦104000Hz
2
Clock Drift
量測值≦200Hz
3
C/No Hi Power Mean
量測值≧39dB
4
C/No Hi Power Sigma
量測值≦2dB
5
Bit Sync
量測值≦5 Sec
6
Frame Sync
量測值≦28 Sec
7
Phase Error
量測值≦0.22
8
RTC 測試
RTC Frequency 測試
31000≦量測值≦33500
可靠性及品質目標
MTBF > 10000 hours.
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REB-3571LP User Manual
1.9 Hardware interface
Figure 1-9 Hardware Interface
Table 1-3 Definition of Pin assignment
Pin Signal Name
I/O Description
Characteristics
I
DC +3.3V±5%
#
1
VCC_3V3
DC Supply
Voltage input
2
GND
G
Ground
Reference Ground
3
Bootselect
I
Boot mode
3.15V ≥ VIH ≥ 2.0V
- 0.3V ≤ VIL ≤ 0.86V
4
RXA
I
Serial port A
5
TXA
O
Serial port A
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
6
TXB
O
Serial port B
2.85V ≥ VOH ≥ 2.14V
7
RXB
I
Serial port B
3.15V ≥ VIH ≥ 2.0V
- 0.3V ≤ VIL ≤ 0.86V
8
GPIO[14]
I/O General
purpose I/O
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
Indicates
VOH = 2.85V
9
RF_ON
O
power state of
RF part
10 GND
G
Ground
Reference Ground
11
G
Ground
Reference Ground
GND
13
VOL ≤ 0.71V
VOL = 0V
REB-3571LP User Manual
12 GND
G
Ground
Reference Ground
13 GND
G
Ground
Reference Ground
14 GND
G
Ground
Reference Ground
15 GND
G
Ground
Reference Ground
16 GND
G
Ground
Reference Ground
17 RF_IN
I
GPS Signal
50 Ω @1.57542GHz
input
18 GND
G
Ground
Reference Ground
19 V_ANT_IN
I
Active
Receiving DC power supply for active antenna
Antenna Bias bias.
voltage
20 VCC_RF_OUT O
Supply
DC +2.85V ±2%
Antenna Bias Current<30mA
voltage
21 V_RTC_3V3
I
Backup
DC + 2.5 ~ +3.6V
voltage supply Current ≤ 10uA
22 Reset
I
Reset (Active VIH > 2.3V V IL < 0.8V
low)
23 GPIO[10]
I/O General
purpose I/O
24 GPIO[1]
I/O General
purpose I/O
25 GPIO[4]
I/O General
purpose I/O
26 GPIO[0]
I/O General
purpose I/O
27 GPIO[13]
I/O General
purpose I/O
28 GPIO[15]
I/O General
purpose I/O
29 PPS
O
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
3.15V ≥ VIH ≥ 2.0V
2.85V ≥ VOH ≥ 2.14V
- 0.3V ≤ VIL ≤ 0.86V
VOL ≤ 0.71V
One pulse per 3.15V ≥ VIH ≥ 2.0V
second
30 GND
G
Ground
Reference Ground
Definition of Pin assignment
.VCC_3V3 (+3.3V DC power Input)
14
- 0.3V ≤ VIL ≤ 0.86V
REB-3571LP User Manual
This is the DC power supply input pin for GPS system. It provides voltage to module.
.GND
GND provides the ground .
.Boot
Set this pin to high for programming flash.
.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.
.RXB
This is the auxiliary receiving channel and is used to input differential corrections to
the board to enable DGPS navigation.
.TXA
This is the main transmitting channel and is used to output navigation and
measurement data to SiRFdemo or user written software.
.TXB
For user’s application (not currently used).
.RF_ON
This pin indicates state of RF voltage.
.GPS_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 line (Microstrip at 50Ω).
.V_ANT_IN
This pin is reserved as external DC power supply input for active antenna.
If using 2.85V active antenna, pin 20 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.
PS: The current must be ≦100mA and voltage ≦12V,if using external power supply.
.VCC_RF_OUT
This pin can provide power 30mA@2.85V for active antenna.
.Reset
This pin provides an active-low reset input to the board. It causes the board to reset
and start searching for satellites. If not utilized, it may be left open.
.PPS
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.
.V_RTC_3V3 (Backup battery)
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REB-3571LP User Manual
This is the battery backup input that powers the SRAM and RTC when main power is
removed. Typical current draw is 10uA.
The supply voltage should be between 2.5V and 3.6V.
.GPIO Functions
Several I/Os are connected to the digital interface connector for custom applications.
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REB-3571LP User Manual
2
Software Interface
2.1 NMEA V3.0 Protocol
Its output signal level is TTL: 4800 bps (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
2-1:
Table 2-1 NMEA-0183 Output Messages
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
2.1.1 GGA-Global Positioning System Fixed Data
Table 2-2 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 2-2 GGA Data Format
Name
Example
Units
Description
Message ID
$GPGGA
UTC Position
161229.487
hhmmss.sss
Latitude
3723.2475
ddmm.mmmm
N/S Indicator
Longitude
GGA protocol header
N
N=north or S=south
12158.3416
Dddmm.mmmm
E/W Indicator
W
E=east or W=west
Position Fix Indicator
1
See Table 2-1
Satellites Used
07
Range 0 to 12
HDOP
1.0
Horizontal Dilution of Precision
MSL Altitude
9.0
meters
Units
M
meters
17
Geoid Separation
meters
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
Table 2-3 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
6
Not Supported GPS PPS Mode, fix valid
Dead Reckoning Mode, fix valid
2.1.2 GLL-Geographic Position –Latitude/Longitude
Table 2-4 contains the values of the following
Example: $GPGLL, 3723.2475, N, 12158.3416, W, 161229.487, A*2C
Table 2-4 GLL Data Format
Name
Example
Message ID
$GPGLL
Latitude
N/S Indicator
Longitude
3723.2475
N
12158.3416
E/W Indicator
W
UTC Position
161229.487
Units
Description
GLL protocol header
ddmm.mmmm
N=north or S=south
Dddmm.mmmm
E=east or W=west
hhmmss.ss
Status
A
A=data valid or V=data not valid
Mode
A
A=Autonomous, D=DGPS, E=DR
Checksum
<CR><LF>
*2C
End of message termination
18
REB-3571LP User Manual
2.1.3 GSA-GNSS DOP and Active Satellites
Table 2-5 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 2-5 GSA Data Format
Name
Example
Message ID
$GPGSA
Units
Description
GSA protocol header
Mode 1
A
See Table 4-2
Mode 2
3
See Table 4-1
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
<CR><LF>
End of message termination
Table 2-6 Mode 1
Value
Description
1
Fix not available
2
2D
3
3D
Table 2-7 Mode 2
Value
Description
M
Manual-forced to operate in 2D or 3D mode
A
Automatic-allowed to automatically switch 2D/3D
2.1.4 GSV-GNSS Satellites in View
Table 2-8 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
19
REB-3571LP User Manual
Table 2-8 GGA Data Format
Name
Example
Message ID
$GPGSV
Number of
Messages
Units
Description
GSV protocol header
2
Range 1 to 3
1
Range 1 to 3
1
Messages Number
1
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
Channel 1(Range 1 to 32)
dBHz
Range 0 to 99, null when not
tracking
….
….
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
<CR><LF>
1
End of message termination
Depending on the number of satellites tracked multiple messages of GSV data may be required.
2.1.5 RMC-Recommended Minimum Specific GNSS Data
Table 2-9 contains the values of the following example:
$GPRMC, 161229.487, A, 3723.2475, N, 12158.3416, W, 0.13, 309.62, 120598, ,*10
Table 2-9 GGA Data Format
Name
Example
Message ID
$GPRMC
UTC Position
161229.487
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Units
RMC protocol header
hhmmss.sss
A
A=data valid or V=data not valid
3723.2475
ddmm.mmmm
N
N=north or S=south
12158.3416
dddmm.mmmm
W
0.13
Description
E=east or W=west
knots
20
Course Over
309.62
degrees
True
Ground
Date
120598
Magnetic Variation
Mode
ddmmyy
degrees
A
Checksum
E=east or W=west
A=Autonomous, D=DGPS, E=DR
*10
2.1.6 VTG-Course Over Ground and Ground Speed
Table 2-10 contains the values of the following example:
$GPVTG, 309.62, T,
, M, 0.13, N, 0.2, K*6E
Table 2-10 VTG Data Format
Name
Message ID
Course
Reference
Example
$GPVTG
309.62
Description
VTG protocol header
degrees Measured heading
T
Course
Reference
Units
True
degrees Measured heading
M
Magnetic
Speed
0.13
Units
N
Speed
0.2
Units
K
Kilometer per hour
Mode
A
A=Autonomous, D=DGPS, E=DR
Checksum
knots
Measured horizontal speed
Knots
km/hr
Measured horizontal speed
*6E
<CR><LF>
End of message termination
21
REB-3571LP Operational Manual
3 GPS Receiver User’s Tip
A.
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.
B.
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.
C.
The following situation will affect the GPS receiving performance:
i.
Solar control filmed windows.
ii.
Metal shielded, such as umbrella, or in vehicle.
iii.
Among high buildings.
iv.
Under bridges or tunnels.
v.
Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
vi.
D.
Bad or heavy cloudy weather.
If the satellite signals can not be locked or encounter receiving problem (while in the urban
area), the following steps are suggested:
i.
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.
ii.
Move to another open space or reposition GPS receiver toward the direction with less
blockage.
E.
iii.
Move the GPS receiver away from the interferences resources.
iv.
Wait until the weather condition is improved.
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.
22
3.1 Package Specification and Order Information
Shipment Method: Tape and reel
Figure 3-1 Package Specifications
3.2 Lead-Free Standard Reflow Profile
260oC,10sec max
260oC
245oC
20~40sec
TP
Ramp-down
6oC/sec
Ramp-up
3oC/sec max
TL
217oC
200oC
60~150sec
Tsmax
Temperature
150oC
Tsmin
Critical Zone
TL to TP
Ts Pretest
60~180sec
T25oC to peak, 480 sec max
Time
Gs t arGS- 89 Lead-Free Standard Reflow Profile
23