GR9804-DS000B
This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without
prior permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
GlobalTop Technology Inc.
Gmm‐u1
GPS Module
Data Sheet
Revision: V0B
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The Gmm-u1 is a stand-alone GPS module with ultra-high sensitivity (-
165dBm) in an ultra-slim form factor (13*10*2.1mm), while utilizing the
latest in MediaTek GPS solution.
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
Title GlobalTop Gmm-u1 Datasheet
Subtitle GPS Module
Doc Type Datasheet
Doc Id GR9804-DS000B
Revision Date Author Description
V0A 2009-10-1 Yingjie First Release
V0B 2009-10-28 Delano Add Reflow Thermal Profile
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
Table of Contents
1. Functional Description ................................................................................................. 4
1.1 Overview............................................................................................................. 4
1.2 Highlights and Features...................................................................................... 5
1.3 System Block Diagram ....................................................................................... 6
2. Specifications................................................................................................................ 7
2.1 Pin Assignment ................................................................................................... 9
2.2 Description of I/O Pin........................................................................................ 10
2.3 Specification List ............................................................................................... 13
2.4 Absolute Maximum Ratings .............................................................................. 14
2.5 Operating Conditions ........................................................................................ 14
3. Protocols...................................................................................................................... 15
4. Application................................................................................................................... 21
4.1 Description........................................................................................................ 21
4.2 Reference Design Circuit .................................................................................. 21
5. Reflow Soldering Temperature Profile ...................................................................... 23
5.1 SMT Reflow Soldering Temperature Profile: ..................................................... 23
5.2 Manual Soldering:............................................................................................. 24
6. Contact ......................................................................................................................... 25
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
1. Functional Description
1.1 Overview
The GlobalTop Gmm-u1 is a high sensitivity, low power and ultra-slim GPS module. Gmm-u1
can support up to 66 channels of satellite searching. Even at high speed vehicle movement,
Gmm-u1 has special function to provide maximum update rate 10Hz to give customers more
precise position fix and vehicle velocity. It delivers major advancements in GPS performances,
accuracy, integration, power consumption and flexibility. It is designed to be suitable for
embedded system integration and simplifies the design procedure by module structure. Gmm-
u1 module is the best choice for integrating GPS function into system design.
Application
ˇ AVL
ˇ Personal tracker
ˇ Bike computer
ˇ Mobile phone
ˇ PND
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
1.2 Highlights and Features
Ultra-high sensitivity, -165dBm1
L1 Frequency, C/A code, 66-channels satellite searching
AGPS support for fast positioning (offline mode: EPO valid up to 14 days)
DGPS(WAAS/EGNOS/MSAS/GAGAN) support
Multi-path detection and compensation
E-GSM-900 band rejection
E911 compliance
USB Interface support
High update rate, up to 10Hz (configurable by firmware)
Magnetic Variation function support (configurable by Gtop customized firmware )
Low power consumption, 48mA acquisition, 37mA tracking
Low shut-down current consumption, 20uA typical
Ultra-slim form factor, 13*10*2.1mm
RoHS compliant
1 Reference to GPS chipset specification
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
1.3 System Block Diagram
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permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
2. Specifications
Unit: mm
Mechanical
Top View
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permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
Unit: mm
Recommend PCB pad Layout
Footprint
(Top View)
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
2.1 Pin Assignment
Pin Name I/O Description & Note
1 ENABLE I Keep open or pull high to Power ON
2 VCC PI Main DC power input
3 GND P Ground
4 N_Reset I Reset Input, Low Active
5 VBACKUP PI Backup power input for RTC & navigation data keep
6 GND P Ground
7 DP I/O USB port D+
8 DM I/O USB port D-
9 RTCM I Serial Data Input for DGPS RTCM data streaming
10 TXDA O Serial Data Output for NMEA output
11 RXDA I Serial Data Input for Firmware update
12 GND P Ground
13 3D_FIX O 3D-fix indicator
14 1PPS O 1PPS Time Mark Output 2.8V CMOS Level
15 GND P Ground
16 RF_IN I Antenna Signal Input
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
2.2 Description of I/O Pin
ENABLE, Pin1
Keep open or pull high to Power ON. Pull low to shutdown the module.
Enable (High): 1.6V<= Venable<=VCC
Disable (Low): 0V<= Venable<=0.3V
VCC, Pin2
The main DC power supply for the module. The voltage should be kept between from 3.3V to
5.5V. The ripple must be controlled under 50mVpp (Typical: 3.3V)
GND, Pin3
Ground
N_Reset, Pin4
Low active, it causes the module to reset. If not used, keep floating
VBACKUP, Pin5
This is the power for GPS chipset to keep RTC running when main power is removed. The
voltage should be kept between 2.0V~4.0V, Typical 3.0V
The pin must be wired to power supply for normal operation
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
GND, Pin6
Ground
DP, Pin7
USB Port DPLUS signal (Differential Signal + )
DM, Pin8
USB Port DMINUS signal (Differential Signal - )
RTCM, Pin9
This pin receive DGPS data of RTCM protocol (TTL level) ,if not used keep floating
TXDA, Pin10
This is the UART transmitter of the module. It outputs the GPS information for application
RXDA, Pin11
This is the UART receiver of the module. It is used to receive commands from system
GND, Pin12
Ground
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
3D-FIX, Pin13
The 3D-FIX was assigned as fix flag output. If not used, keep floating
Before 2D Fix
The pin should continuously output one-second high-level with one-second low-level
signal
After 2D or 3D Fix
The pin should continuously output low-level signal
1PPS, Pin14
This pin provides one pulse-per-second output from the module, which is synchronized to
GPS time. If not used, keep floating; default duration 100ms
GND, Pin15
Ground
RF_IN, Pin16
GPS RF signal input. Patch;If used to external active antenna, which is the power supply
from external DC voltage. The voltage should be kept between 3.0V~4.0V, Typical 3.0V
1s
1s
Low
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
2.3 Specification List
Parameter Description
GPS Solution MTK MT3329
Frequency L1, 1575.42MHz
Sensitivity1
Acquisition -148dBm, cold start
Reacquisition -160dBm
Tracking -165dBm
Channel 66 channels
TTFF1
Hot start: 1 second typical
Warm start: 33 seconds typical
Cold start: 35 seconds typical
Altitude Maximum 18,000m (60,000 feet)
Velocity Maximum 515m/s (1000 knots)
Acceleration Maximum 4G
Update Rate 1Hz (default), maximum 10Hz
Baud Rate 9600 bps (default)
DGPS RTCM protocol / SBAS(defult) [WAAS, EGNOS, MSAS,GAGAN]
AGPS Support
Power Supply VCC:3.3V to 5.5V;VBACKUP:2.0V to 4.0V
Current Consumption
48mA acquisition, 37mA tracking
Shut-down current consumption 20uA typical
Working Temperature -40 ℃ to +85 ℃
Dimension 13x10x2.1m, SMD
Weight 0.5g
1 Reference to GPS chipset specification
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
2.4 Absolute Maximum Ratings
The voltage applied for VCC should not exceed 6VDC;
Parameter Symbol Min. Typ. Max. Unit
Power Supply Voltage VCC - 3.3 5.5 V
Backup battery Voltage VBACKUP 2.0 3.0 4.0 V
2.5 Operating Conditions
Parameter Condition Min. Typ. Max. Unit
Operation supply Ripple Voltage - - - 50 mVpp
RX0 TTL H Level VCC=3.3V 2.1 - VCC V
RX0 TTL L Level VCC=3.3V 0 - 0.9 V
TX0 TTL H Level VCC=3.3V 2.1 - 2.8 V
TX0 TTL L Level VCC=3.3V 0 - 0.8 V
RTCM TTL H Level VCC=3.3V 2.1 - VCC V
USB D+ Standard - - - V
USB D- Standard - - - V
RTCM TTL L Level VCC=3.3V 0 - 0.9 V
Acquisition 43 48 53 mA Current Consumption @ 3.3V
Tracking 32 37 42 mA
Backup Power Consumption@ 3.0V 25℃ - 20 - uA
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permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
3. Protocols
NMEA Output Sentence
Table-1 lists each of the NMEA output sentences specifically developed and defined by MTK for
use within MTK products
Table-1: NMEA Output Sentence
Option Description
GGA Time, position and fix type data.
GSA GPS receiver operating mode, active satellites used in the
position solution and DOP values.
GSV The number of GPS satellites in view satellite ID numbers,
elevation, azimuth, and SNR values.
RMC Time, date, position, course and speed data. Recommended
Minimum Navigation Information.
VTG Course and speed information relative to the ground.
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
GGA—Global Positioning System Fixed Data. Time, Position and fix related data
Table-2 contains the values for the following example:
$GPGGA,064951.000,2307.1256,N,12016.4438,E,1,8,0.95,39.9,M,17.8,M,,*65
Table-2: GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol header
UTC Time 064951.000 hhmmss.sss
Latitude 2307.1256 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12016.4438 dddmm.mmmm
E/W Indicator E E=east or W=west
Position Fix
Indicator
1 See Table-3
Satellites Used 8 Range 0 to 14
HDOP 0.95 Horizontal Dilution of Precision
MSL Altitude 39.9 meters Antenna Altitude above/below mean-sae-level
Units M meters Units of antenna altitude
Geoidal Separation 17.8 meters
Units M meters Units of geoid separation
Age of Diff. Corr. second Null fields when DGPS is not used
Checksum *65
End of message termination
Table-3: Position Fix Indicator
Value Description
0 Fix not available
1 GPS fix
2 Differential GPS fix
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permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
GSA—GNSS DOP and Active Satellites
Table-4 contains the values for the following example:
$GPGSA,A,3,29,21,26,15,18,09,06,10,,,,,2.32,0.95,2.11*00
Table-4: GSA Data Format
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Table-5
Mode 2 3 See Table-6
Satellite Used 29 SV on Channel 1
Satellite Used 21 SV on Channel 2
.... …. …. ....
Satellite Used SV on Channel 12
PDOP 2.32 Position Dilution of Precision
HDOP 0.95 Horizontal Dilution of Precision
VDOP 2.11 Vertical Dilution of Precision
Checksum *00
End of message termination
Table-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-6: Mode 2
Value Description
1 Fix not available
2 2D (<4 SVs used)
3 3D (≧4 SVs used)
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
GSV—GNSS Satellites in View
Table-7 contains the values for the following example:
$GPGSV,3,1,09,29,36,029,42,21,46,314,43,26,44,020,43,15,21,321,39*7D
$GPGSV,3,2,09,18,26,314,40,09,57,170,44,06,20,229,37,10,26,084,37*77
$GPGSV,3,3,09,07,,,26*73
Table-7: GSV Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol header
Number of
Messages
3 Range 1 to 3
(Depending on the number of
satellites tracked, multiple
messages of GSV data may be
required.)
Message
Number1
1 Range 1 to 3
Satellites in View 09
Satellite ID 29 Channel 1 (Range 1 to 32)
Elevation 36 degrees Channel 1 (Maximum 90)
Azimuth 029 degrees Channel 1 (True, Range 0 to 359)
SNR (C/No) 42 dBHz Range 0 to 99,
(null when not tracking)
.... …. …. ....
Satellite ID 15 Channel 4 (Range 1 to 32)
Elevation 21 degrees Channel 4 (Maximum 90)
Azimuth 321 degrees Channel 4 (True, Range 0 to 359)
SNR (C/No) 39 dBHz Range 0 to 99,
(null when not tracking)
Checksum *7D
End of message termination
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
RMC—Recommended Minimum Navigation Information
Table-8 contains the values for the following example:
$GPRMC,064951.000,A,2307.1256,N,12016.4438,E,0.03,165.48,260406,,,A*55
Table-8: RMC Data Format
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC Time 064951.000 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 2307.1256 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12016.4438 dddmm.mmmm
E/W Indicator E E=east or W=west
Speed over
Ground
0.03 knots
Course over
Ground
165.48 degrees True
Date 260406 ddmmyy
Magnetic
Variation
degrees E=east or W=west
(Need GlobalTop Customization
Service)
Mode A A= Autonomous mode
D= Differential mode
E= Estimated mode
Checksum *65
End of message termination
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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without prior
permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
VTG—Course and speed information relative to the ground
Table-9 contains the values for the following example:
$GPVTG,165.48,T,,M,0.03,N,0.06,K,A*37
Table-9: VTG Data Format
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course 165.48 degrees Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic
(Need GlobalTop Customization
Service)
Speed 0.03 knots Measured horizontal speed
Units N Knots
Speed 0.06 km/hr Measured horizontal speed
Units K Kilometers per hour
Mode A A= Autonomous mode
D= Differential mode
E= Estimated mode
Checksum *06
End of message termination
MTK NMEA Command Protocol
Packet Type :
103 PMTK_CMD_COLD_START
Packet Meaning:
Cold Start:Don’t use Time, Position, Almanacs and Ephemeris data at re-start.
Example:
$PMTK103*30
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permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.
4. Application
4.1 Description
This chapter introduces the reference schematic design for the best performance.
4.2 Reference Design Circuit
Patch Antenna Application
Notice:
1. Ferrite bead L1 was add for power noise reduction.
2. C1 and C2 decoupling capacitor should put near module.
For C1, the value depends on system noise, range 1uF~100uF is reasonable.
3. Damping resistors R1, R2, R3, R4 and R5 should be fine-tuned for system application.
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