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LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
1
Product name
Description
Version
LS2003H-2R
Standalone GPS smart antenna module
0.1
Introduction
LS2003H-2R is a complete standalone GPS smart antenna module, the module is powered by
MediaTek GPS chip and it can provide you with superior sensitivity and performance even in urban canyon
and dense foliage environment.
The module includes embedded chip antenna and GPS receiver ciricuits, dedicated designed for tablet
PC, MID, PND and smart phone that are going to integrate GPS function. It is also optionally be connected to
an external active GPS antenna.
2
Features
3
Tiny size: 14x9.6x1.7mm
MediaTek high sensitivity solution
Support 66-channel GPS
Fast TTFF at low signal level
Built-in 12 multi-tone active interference canceller
Capable of SBAS (WAAS, EGNOS, MSAS, GAGAN)
Support Japan QZSS
Ultra low power consumption
Fast TTFF at low signal level
Built-in 12 multi-tone active interference canceller
±11ns high accuracy time pulse (1PPS)
Indoor and outdoor multi-path detection and compensation
SMD type with stamp holes; RoHS compliant
ISO/TS 16949 quality control
Support RTCM SC-104 Version-2.x
Application
Personal positioning and navigation
Automotive navigation, model aircraft navigation
Marine navigation
Page 1/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Fig 3-1 System block diagram.
Fig 3-2 Typical application circuit that uses embedded antenna.
Page 2/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Fig 3-3 Typical application circuit that uses an active antenna.
4
GNSS receiver
4.1 GPS receiver
Chip
MediaTek MT3337
Frequency
L1 1575.42MHz, C/A code
Channels
Support 66 channels (22 Tracking, 66 Acquisition)
Update rate
1Hz default
Sensitivity
Acquisition Time
Position Accuracy
Tracking
up to -165.5dBm (with external LNA)(1)
Cold start
up to -148dBm (with external LNA)(1)
Hot start (Open Sky)
1s (typical)
Cold Start (Open Sky)
31s (typical)
Autonomous
3m CEP
SBAS
2.5m (depends on accuracy of correction data).
Max. Altitude
50,000m
Max. Velocity
< 515 m/s
Protocol Support
NMEA 0183 ver 4.10
Real-time Differential Correction
9600 bps, 8 data bits, no parity, 1 stop bits (default)
1Hz: GGA, GSA, GSV, RMC
RTCM SC-104 v2.x message types 1,2,3, and 9
Note 1: This value is the sensitivity for RFIN(pin-17).
Page 3/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
4.2 GPS antenna
The antenna type of LS2003H-2R is chip antenna. Its performance is greatly affected by many
factors, such as the size of PCB ground plane, installation position and its surrounding materials. In
order to make it perform well and save you from reinventing the wheel, please consult our FAE
before you get started to design.
Antenna type
Chip antenna
Polarization
Linear
Frequency
1575.42MHz
Bandwidth (under -10dB)
39MHz (1)
Peak Gain
-1.04 dBi (1)
Note 1: This value is measured with our evaluation board
5
Pin assignment and descriptions
Table 5-1 Pin descriptions
Pin # Name
Type Description
1
NC
2
GPIO6
3
NC
4
GND
P
Ground
5
GND
P
Ground
6
NC
Note
Not connect
O
Default status indicator. When GPS position fix is available,
it outputs 100ms high per second, otherwise it outputs low.
Not connect
Not connect
Page 4/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
7
NC
Not connect
8
VBACKUP
P
Backup battery supply voltage
This pin is optional.
9
VCC
P
DC supply voltage
10
GND
P
Ground
11
GND
P
Ground
12
GND
P
Ground
13
GND
P
Ground
14
GND
P
Ground
15
GND
P
Ground
16
ANT
O
Embedded Antenna Output (50 ohm)
17
RFIN
18
GND
P
Ground
19
GND
P
Ground
20
NC
21
GND
P
Ground
22
GND
P
Ground
23
/RESET
I
Manual reset input pin. Active at “L” input. Internal pulled
up via a resistor. If /RESET pin is not necessary, open this
node.
24
RX1
I
Serial Data Input for DGPS RTCM Data Streaming
25
TX0
O
Serial output for channel 0 (Default NMEA)
26
RX0
I
Serial input for channel 0 (Default NMEA)
27
GND
P
Ground
28
BR4K8
I
The baud rate of UART0 is 4800 when this pin is connected
to ground (through a pull-down resistor).
29
1PPS
O
Time pulse (1PPS, default 100 ms pulse/sec when 3D fix is
available)
30
NC
31
GND
1
I/O GPS RF signal input and output voltage for active antenna
Not connect
Not connect
P
Ground
<Note>
1.
The module doesn't has hot start when this pin and VCC pin are not applied.
Page 5/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
6
DC & Temperature characteristics
6.1 Absolute maximum ratings
Parameter
Symbol
Ratings
Units
VCC
4.3
V
Input Backup Battery Voltage
V_BCKP
4.3
V
Operating Temperature Range
Topr
-40 ~ 85
℃
Storage Temperature Range
Tstg
-40 ~ 85
℃
Input Voltage
6.2 DC Electrical characteristics
Parameter
Input Voltage
Input Backup Battery Voltage
Symbol
Conditions
Min.
Typ.
Max.
Units
VCC
3.0
3.3
4.3
V
V_BCKP
2.0
4.3
V
85
VCC = 3.3V,
w/o active antenna,
Supply Current
Iss
Peak
Tracking
Standby
18(1)
190
mA
mA
uA
VCC = 0V
9
uA
Backup Battery Current
Ibat
High Level Input Voltage
VI H
2.0
3.6
V
Low Level Input Voltage
VI L
-0.3
0.8
V
High Level Input Current
IIH
no pull-up or down
-1
1
uA
Low Level Input Current
IIL
no pull-up or down
-1
1
uA
High Level Output Voltage
VOH
2.4
3.3
V
Low Level Output Voltage
VOL
0.4
V
High Level Output Current
IOH
2
mA
Low Level Output Current
IOL
2
mA
Minimum Pulse Width
TMPW
For /Reset pin
1
mS
Note 1. Measured when position fix (1Hz) is available, input voltage is 3.3V.
6.3 Temperature characteristics
Parameter
Symbol
Min.
Typ.
Max.
Units
Operating Temperature
Topr
-40
-
85
℃
Storage Temperature
Tstg
-40
25
85
℃
Page 6/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
7
Mechanical specification
7.1 Outline dimensions
Top view
Bottom view
Page 7/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
7.2 Recommended land pattern dimensions
8
Software interface
8.1 NMEA output message
Table 8.1-1 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
GGA--- Global Positioning System Fixed Data
Table 8.1-2 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
Table8.1- 2 GGA Data Format
Name
Example
Units
Description
Message ID
$GPGGA
GGA protocol header (GNGGA, GPGGA or BDGGA)
UTC Time
053740.000
hhmmss.sss
Latitude
2503.6319
ddmm.mmmm
N/S indicator
N
N=north or S=south
Page 8/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Longitude
12136.0099
dddmm.mmmm
E/W Indicator
E
E=east or W=west
Position Fix Indicator
1
See Table 8.1-3 (2: DGPS(RTCM) or SBAS)
Satellites Used
08
Range 0 to 33
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.
0000
second
Diff. Ref. Station ID
0000
Checksum
*64
<CR> <LF>
Null fields when DGPS is not used
End of message termination
Table 8.1-3 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
GLL--- Geographic Position – Latitude/Longitude
Table 8.1-4 contains the values for the following example:
$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52
Table 8.1-4 GLL Data Format
Name
Example
Units
Description
Message ID
$GPGLL
GLL protocol header (GNGLL, GPGLL or BDGLL)
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
UTC Time
053740.000
hhmmss.sss
Status
A
A=data valid or V=data not valid
Mode
A
Checksum
*52
A=autonomous, D=DGPS, E=DR, N=Data not valid,
R=Coarse Position, S=Simulator
Page 9/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
<CR> <LF>
End of message termination
GSA---GNSS DOP and Active Satellites
Table 8.1-5 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 8.1-5 GSA Data Format
Name
Example
Units
Description
Message ID
$GPGSA
GSA protocol header (GPGSA and BDGSA)
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 8.1-6 Mode 1
Value
Description
M
Manual- forced to operate in 2D or 3D mode
A
Automatic-allowed to automatically switch 2D/3D
Table 8.1-7 Mode 2
Value
Description
1
Fix not available
2
2D
3
3D
GSV---GPS Satellites in View
Table 8.1-8 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
$GPGSV,3,3,12,08,22,214,38,27,08,190,16,19,05,092,33,23,04,127,*7B
Table 8.1-8 GSV Data Format
Name
Example
Message ID
$GPGSV
Units
Description
GSV protocol header
Page 10/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Total number of messages1 3
Range 1 to 4
Message number1
1
Range 1 to 4
Satellites in view
12
Satellite ID2
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)
Channel 1 (Range 01 to 196)
….
….
Satellite ID
20
Channel 4 (Range 01 to 196)
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
<CR> <LF>
End of message termination
1. Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC---Recommended Minimum Specific GPS Data
Table 8.1-9 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 8.1-9 RMC Data Format
Name
Example
Message ID
$GPRMC
RMC protocol header (GNRMC, GPRMC or BDRMC)
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
E=east or W=west (Not shown)
Mode
A
Checksum
*53
<CR> <LF>
Units
A=autonomous, D=DGPS, E=DR, N=Data not valid,
R=Coarse Position, S=Simulator
End of message termination
Page 11/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
VTG---Course Over Ground and Ground Speed
Table 8.1-10 contains the values for the following example:
$GPVTG,79.65,T,,M,2.69,N,5.0,K,A*38
Table 8.1-10 VTG Data Format
Name
Example
Message ID
$GPVTG
Course over ground
79.65
Reference
T
Units
VTG protocol header (GNVTG, GPVTG or BDVTG)
degrees
Reference
M
Speed over ground
2.69
Units
N
Speed over ground
5.0
Units
K
Mode
A
Checksum
*38
Measured heading
True
degrees
Course over ground
Description
Measured heading
Magnetic
knots
Measured speed
Knots
km/hr
Measured speed
Kilometer per hour
A=autonomous, D=DGPS, E=DR, N=Data not valid,
R=Coarse Position, S=Simulator
<CR> <LF>
End of message termination
8.2 Proprietary NMEA input/output message
Please refer to MTK proprietary message.
8.3 Examples to configure the power mode of GPS module
The GPS module supports different power modes that user can configure by issuing
software commands.
8.3.1 Standby mode
User can issue software command to make GPS module go into standby mode that
consumes less than 200uA current. GPS module will be awaked when receiving any byte.
The following flow chart is an example to make GPS module go into standby mode and
then wake up.
Page 12/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Start
GPS module is powered on
and in normal operation mode
Change GPS to
standby mode
Wake up
GPS module
unsigned char StandbyMode[] = {"$PMTK161,0*28\x0D\x0A"};
Yes
Issue any byte to
wake up GPS module
No
GPS module will return {"$PMTK010,001*2E\x0D\x0A"}
and start normal operation.
End
8.3.2 Periodic mode
When GPS module is commanded to periodic mode, it will be in operation and
standby periodically. Its status of power consumption is as below chart.
The following flow chart is an example to make GPS module go into periodic mode
and then back to normal operation mode.
Page 13/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Start
GPS module is powered on
Change GPS to periodic mode with
3000ms on and 12000ms standby
if position fix is available, otherwise
(18000, 72000) ms will be applied.
unsigned char PeriodicMode[] =
{"$PMTK225,2,3000,12000,18000,72000*15\x0D\x0A"};
Note: minimum on time is 2000ms.
maximum standby time is 518400000ms (6 days)
GPS module will return message
"$PMTK001,225,3*35\x0D\x0A"
if command is accepted.
Set GPS to normal
operation mode?
Yes
GPS is in
standby now
Yes
Issue any byte to GPS
and wait it awake
No
No
Issue command of
normal operation mode
unsigned char NormalMode[] =
{"$PMTK225,0*2B\x0D\x0A"};
GPS module will return message
"$PMTK001,225,3*35\x0D\x0A"
if command is accepted.
End
GPS is in periodic mode
End
GPS is in normal mode
8.3.3 AlwaysLocateTM mode
AlwaysLocateTM is an intelligent controller of periodic mode. Depending on the
environment and motion conditions, GNSS module can adaptively adjust working/standby
time to achieve balance of positioning accuracy and power consumption. In this mode, the
host CPU does not need to control GNSS module until the host CPU needs the GNSS
position data. The following flow chart is an example to make GNSS module go into
AlwaysLocateTm mode and then back to normal operation mode.
Note: AlwaysLocateTM is a trade mark of MTK.
Page 14/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Start
GPS module is powered on
Change GPS to
AlwaysLocate mode
unsigned char AlwaysLocateMode[] =
{"$PMTK225,8*23\x0D\x0A"};
Yes
GPS module will return message
"$PMTK001,225,3*35\x0D\x0A"
if command is accepted.
Request a GPS
position data
No
No
Yes
Issue any byte to get
GPS position data
Set GPS to normal
operation mode?
Change GPS back to
AlwaysLocate mode
Yes
Issue any byte to GPS
and wait it awake
No
Set GPS to normal
operation mode
unsigned char NormalMode[] =
{"$PMTK225,0*2B\x0D\x0A"};
End
GPS is in normal mode
8.4 Data logger
The GPS module has internal flash memory for logging GPS data. The configurations
include time interval, distance, speed, logging mode, and … etc. For more information, please
contact us.
8.5 Examples to configure the update rate of GNSS module
The GNSS module supports up to 10Hz update rate that user can configure by issuing
software commands. Note that the configurations by software commands are stored in the
Page 15/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
battery-backed SRAM that is powered through VBACKUP pin. Once it drains out, the
default/factory settings will be applied.
Due to the transmitting capacity per second of the current baud rate, GPS module has to be
changed to higher baud rate for high update rate of position fix. The user can use the following
software commands to change baud rate.
Baud rate
Software command
Factory default
$PMTK251,0*28<CR><LF>
4800
$PMTK251,4800*14<CR><LF>
9600
$PMTK251,9600*17<CR><LF>
19200
$PMTK251,19200*22<CR><LF>
38400
$PMTK251,38400*27<CR><LF>
57600
$PMTK251,57600*2C<CR><LF>
115200
$PMTK251,115200*1F<CR><LF>
Note: <CR> means Carriage Return, i.e. 0x0D in hexadecimal. <LF> means Line Feed, i.e. 0x0A in
hexadecimal.
If the user does not want to change baud rate, you can reduce the output NMEA sentences
by the following software commands.
NMEA sentence
Software command
Factory default
$PMTK314,-1*04<CR><LF>
Only GLL at 1Hz
$PMTK314,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only RMC at 1Hz
$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only VTG at 1Hz
$PMTK314,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only GGA at 1Hz
$PMTK314,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only GSA at 1Hz
$PMTK314,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only GSV at 1Hz
$PMTK314,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0*29<CR><LF>
Only ZDA at 1Hz
$PMTK314,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0*29<CR><LF>
RMC, GGA, GSA
at 1Hz and GSV at $PMTK314,0,1,0,1,1,5,0,0,0,0,0,0,0,0,0,0,0,0,0*2C<CR><LF>
0.2Hz
If the command is correct and executed, GPS module will output message
$PMTK001,314,3*36<CR><LF>
After the GPS module is changed to higher baud rate or reduced NMEA sentence, the user
can configure it to high update rate of position fix by the following commands.
Interval of position fix
Software command
Every 100ms (10Hz)(1)
$PMTK220,100*2F<CR><LF>
Page 16/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Every 200ms (5Hz)
$PMTK220,200*2C<CR><LF>
Every 500ms (2Hz)
$PMTK220,500*2B<CR><LF>
Every 1000ms (1Hz)
$PMTK220,1000*1F<CR><LF>
(2)
Every 2000ms (0.5Hz)
$PMTK220,2000*1C<CR><LF>
If the command is correct and executed, GNSS module will
output message $PMTK001,220,3*30<CR><LF>
Note 1: The minimum interval of position fix is 100ms, i.e. the maximum update rate is 10Hz.
Note 2: The current consumption is the same with the update rate of 1Hz.
8.6 Configure the static navigation parameter
The output position of GPS module will keep the same and output speed will be zero if the
actual speed is below the threshold of the static navigation parameter. This is useful for different
applications. For example, the car stopped at a red light will get stationary GPS position if the
threshold is 1.5m/s. It is better to disable this function by setting threshold to 0 for pedestrian
navigation.
The format of the software command is as below.
$PMTK386,speed threshold*checksum<CR><LF>
The unit of speed threshold is meter per second. The range of speed threshold is from
0.1m/s to 2.0m/s. Value 0 is to disable the function.
Page 17/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Start
Change static navigation to
1.5m/s threshold
unsigned char SpeedThreshold1_5[] =
{"$PMTK386,1.5*39\x0D\x0A"};
GPS module will return message
"$PMTK001,386,3*3D\x0D\x0A"
if command is accepted.
Disable static
navigation function?
Yes
Set 0 threshold
No
unsigned char SpeedThreshold0[] =
{"$PMTK386,0*23\x0D\x0A"};
GPS module will return message
"$PMTK001,386,3*3D\x0D\x0A"
if command is accepted.
End
Page 18/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
9
Recommended Soldering Temperature Profile
The module belongs to RoHS compliant. The maximum of peak temperature, real on top of PCB, is
not over 240 Celsius.
Lead-free Processes
Lead –Free Solder Paste (Sn 96.5-Ag 3.0-Cu 0.5)
Cycle Interval: 300 sec
Note:
The LS2003H-2R module should be soldered on the topside in the soldering process to prevent from
falling down.
Page 19/20
© 2014 LOCOSYS Technology Inc.
LOCOSYS Technology Inc.
20F.-13, No.79, Sec. 1, Xintai 5th Rd.,
Xizhi Dist., New Taipei City 221, Taiwan
℡ 886-2-8698-3698
886-2-8698-3699
www.locosystech.com/
Document change list
Revision 0.1
First release on December 24, 2014.
Page 20/20
© 2014 LOCOSYS Technology Inc.
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