Gotop GT-1612-MTBD Manual
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Gotop GT-1612-MTBD Manual

Gps&beidou receiver module
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General Description
The Gotop GT-1612-MTBD is a complete
GPS&Beidou engine module that features super
sensitivity, ultra low power and small form factor.
The GPS&Beidou signal is applied to the
antenna input of module, and a complete serial
data message with position, velocity and time
information is presented at the serial interface
with NMEA protocol or custom protocol.
Its –165dBm tracking sensitivity extends
positioning coverage into place like urban
canyons and dense foliage environment where
the GPS&Beidou was not possible before. The
small form factor and low power consumption
make the module easy to integrate into portable
device like PNDs, mobile phones, cameras and
vehicle navigation systems.
Applications
 LBS (Location Based Service)
 PND (Portable Navigation Device)
 Vehicle navigation system
 Mobile phone
www.gotop-zzu.com
GPS&Beidou Receiver Module
Figure: GT-1612-MTBD Top View
Features
 Build on high performance, low-power
MediaTek
 Ultra high Track sensitivity: -165dBm
 Extremely fast TTFF at low signal level
 Built in high gain LNA
 Low power consumption: Max 45mA@3.3V
 NMEA-0183 compliant protocol or custom
protocol
 Operating voltage: 2.8V to 4.3V
 Operating temperature range:-40to85℃
 SMD type with stamp holes
 Small form factor: 16x12x2.6mm
 RoHS compliant (Lead-free)
Page 1 of 35
GT-1612-MTBD
MT3333 chip set
Revision: V2.0.1-January 2015

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Summary of Contents for Gotop GT-1612-MTBD

  • Page 1 GT-1612-MTBD GPS&Beidou Receiver Module General Description The Gotop GT-1612-MTBD is a complete GPS&Beidou engine module that features super sensitivity, ultra low power and small form factor. The GPS&Beidou signal is applied to the antenna input of module, and a complete serial...

  • Page 2: Table Of Contents

    GT-1612-MTBD GPS&Beidou Receiver Module 1 Description..................................3 1.1 General Description...............................3 1.2. Key Features.................................4 1.3. Block Diagram..............................5 1.4. Protocols Supported by the Module........................5 2 Application..................................6 2.1. Pin Assignment..............................6 2.2. Pin Definition............................... 6 2.3. Power Supply............................... 7 2.4. Operating Modes..............................10 2.4.1.

  • Page 3: Description

    So host can query the external active antenna status timely and conveniently. EASY technology as the key feature of GT-1612-MTBD is one kind of AGNSS. Capable collecting and processing all internal aiding information like GPS&Beidou time ， Ephemeris, Last Position,etc.,the GPS&Beidou module delivers a very short TTFF in either Hot or Warm start.

  • Page 4: Key Features

    GT-1612-MTBD GPS&Beidou Receiver Module 1.2. Key Features Table 1: Key Features Parameter Specification Power Supply • Supply voltage: 2.8V~4.3V Typical: 3.3V • Acquisition: 45mA @VCC=V_BCKP=3.3V • Tracking: 40mA @VCC=V_BCKP=3.3V Power Consumption • Standby: 2.0mA @VCC=V_BCKP=3.3V • Backup: 20uA @V_BCKP=3.3V •...

  • Page 5: Block Diagram

    GPS&Beidou Receiver Module 1.3. Block Diagram The following figure shows a block diagram of GT-1612-MTBD module. It consists of a single chip GNSS IC which includes the RF part and Baseband part, a LNA, a SAW filter, a TCXO, a crystal oscillator.

  • Page 6: Application

    GT-1612-MTBD GPS&Beidou Receiver Module 2 Application The module is equipped with a 24-pin SMT pad that connects to your application platform. Sub-interfaces included in the pad are described in details in the following chapters. 2.1. Pin Assignment Figure 2: Pin Assignment 2.2.

  • Page 7: Power Supply

    GT-1612-MTBD GPS&Beidou Receiver Module UART Port Pin Name Pin No. Description DC Characteristics Comment VILmin=-0.3V VILmax=0.8V Receive data VIHmin=2.0V VIHmax=3.6V VOLmin=-0.3V VOLmax=0.4V Transmit data VOHmin=2.4V VOHmax=3.1V RF Interface Pin Name Pin No. Description DC Characteristics Comment External active Characteristic impedance of...
  • Page 8 Power supply solutions for GT-1612-MTBD module are listed as the following.  The simplest power circuit for GT-1612-MTBD module is 3.3V power source connected to VCC pin and VBAT pin of the module directly. In this case, once you powered on the module, the full cold start will be implemented.
  • Page 9 Figure 5: Reference Charging Circuit for Chargeable Battery VCC does not supply power for RTC domain in GT-1612-MTBD module, so the VBAT pin must be powered externally. Furthermore, it is strongly recommended to supply power to VBAT through a backup battery, which can ensure GT-1612-MTBD module supports EASY technology and improves TTFF after next restart.

  • Page 10: Operating Modes

    GT-1612-MTBD GPS&Beidou Receiver Module 2.4. Operating Modes The table below briefly illustrates the relationship among different operating modes of GT-1612-MTBD module. Table 3: Module States Switch Current Next Mode Mode Backup Standby Full on Periodic AlwaysLocate Refer to Backup chapter 2.4.3...

  • Page 11: Standby Mode

    Backup mode consumes lower power than standby mode. In this mode, only the backup supply VBAT is powered on while the main supply VCC is switched off by host or the TIMER signal of GT-1612-MTBD. In order to enter into backup mode autonomously via the TIMER pin, an external switch circuit is necessary.
  • Page 12 When this command is executed successfully, TIMER signal will be pulled down to close the power switch, so GT-1612-MTBD module can go into backup mode as the main power VCC is cut off. For this case, pulling the GPS_EN signal high by host is the only way to wake the module up.

  • Page 13: Periodic Mode

    Figure 7: Seiko MS920SE Charge and Discharge Characteristics 2.4.4. Periodic Mode Periodic mode is a power saving mode of GT-1612-MTBD that can control the full on mode and standby/backup mode periodically to reduce power consumption. It contains periodic standby mode and periodic backup mode.
  • Page 14 GT-1612-MTBD GPS&Beidou Receiver Module Example $PMTK225,1,3000,12000,18000,72000*16<CR><LF> $PMTK225,2,3000,12000,18000,72000*15<CR><LF> Sending “$PMTK225,0*2B” in any time will make the module enter into full on mode from periodic standby mode. Sending “$PMTK225,0*2B” just in Run_time or 2nd_run_time can make the module enter into full on mode from periodic backup mode.

  • Page 15: Alwayslocatetm Mode

    “$PMTK225,0*2B” sent just after the module has been waked up from previous backup cycle. The positioning accuracy in AlwaysLocate mode will be somewhat degraded, especially in high speed. The ™ following picture shows the rough power consumption of GT-1612-MTBD module in different daily scenes when AlwaysLocate ™ mode is enabled.

  • Page 16: Flp Mode

    FLP function is disabled by default. You can enable FLP by SDK or PMTK command. Sending “$PMTK262,1*29” will enable FLP function, and wait until GT-1612-MTBD module gets a valid fix. Then wait at least 60s for GT-1612-MTBD to enter FLP mode. FLP function will be disabled after sending “$PMTK262,0*28”.

  • Page 17: Uart Interface

    GT-1612-MTBD GPS&Beidou Receiver Module 2.5. UART Interface The module provides one universal asynchronous receiver& transmitter serial port. The module is designed as DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. The module and the client (DTE) are connected through the signals shown in the following figure. It supports data baud-rate from 4800bps to 115200bps.

  • Page 18: Easy Technology

    EASY function is enabled by default. Command “$PMTK869,1,0*34” can be used to disable EASY. 2.7. Multi-tone AIC GT-1612-MTBD module provides an advanced technology called multi-tone AIC (Active Interference Cancellation) to reject RF interference which comes from other active components on the main board.

  • Page 19: Locus

    Host can get the data from the module via UART by sending“$PMTK622,1*29”.  The raw data which host gets has to be parsed via LOCUS parser code provided by GOTOP. For more details, please contact GOTOP technical supports. 2.9. Antenna Supervisor Antenna Supervisor is designed to detect different external active antenna status including external active antenna connection, open circuit for antenna and antenna short-circuited, and then notify the module.

  • Page 20: Pps Vs. Nmea

    3 Antenna Interfaces 3.1. PCB Design Guide The GT-1612-MTBD GPS&Beidou receiver is designed for supporting the active antenna or passive antenna connected with pin RF_IN. The gain of active antenna should be no less than 15dB. The maximum noise figure should be no more than 2.5dB and output impedance is at 50 Ohm.

  • Page 21: External Active Antenna

    GT-1612-MTBD GPS&Beidou Receiver Module 3.2. External Active Antenna The following figure is a typical reference design with active antenna. In this mode, DC on the VCC_RF pin is powered by VCC and supplies power to the external active antenna. Figure 14: Reference Design for Active Antenna...

  • Page 22: Antenna Status Indicator

    If the external active antenna is short-circuited, the “SHORT” will be displayed in the GPTXT of NMEA  sentence. Because antenna short protection is enabled by default, GT-1612-MTBD will switch to embedded patch antenna  automatically in case that external active antenna is short-circuited, which will avoid GT-1612-MTBD from damage.

  • Page 23: Electrical, Reliability And Radio Characteristics

    GT-1612-MTBD GPS&Beidou Receiver Module Table 9: GPTXT - Status of Antenna GPTXT Ext Active Inner Patch Attention Display Antenna Status Antenna Status You need to check the external active antenna OPEN Unused Working status if the active antenna is using.

  • Page 24: Operating Conditions

    GT-1612-MTBD GPS&Beidou Receiver Module 4.2. Operating Conditions Table 11: Power Supply Ratings Parameter Description Conditions Min. Typ. Max. Unit Voltage must stay within the min/max values, Supply voltage including voltage drop, ripple, and spikes. IVCCP Peak supply current VCC=3.3V VBAT...

  • Page 25: Electrostatic Discharge

    GT-1612-MTBD GPS&Beidou Receiver Module 4.4. Electrostatic Discharge GT-1612-MTBD module is an ESD sensitive device. ESD protection precautions should still be emphasized. Proper ESD handling and packaging procedures must be applied throughout the processing, handling and operation of any application. The ESD bearing capability of the module is listed in the following table. Note that you should add ESD components to module pins in particular applications.

  • Page 26: Mechanical Dimensions

    6.1. Assembly and Soldering GT-1612-MTBD module is intended for SMT assembly and soldering in a Pb-free reflow process on the top side of the PCB. It is suggested that the minimum height of solder paste stencil is 100um to ensure sufficient solder volume.

  • Page 27: Moisture Sensitivity

    24 hours at temperature 125°C±5°C in high-temperature containers. Care should be taken that the plastic tape is not heat resistant. GT-1612-MTBD should be taken out from the tape before preheating; otherwise, the tape maybe damaged by high-temperature heating.

  • Page 28: Tape And Reel Packaging

    GT-1612-MTBD GPS&Beidou Receiver Module 6.4. Tape and Reel Packaging Unit: mm Quantity per reel: 1000pcs Lengh per reel: 20m Figure 18: Tape and Reel Specifications Figure 19: Packaging physical Figure Table 15: Reel Packaging Model Name MOQ for MP Minimum Package: 1000pcs Size: 365mm ×...

  • Page 29: Appendix References

    GT-1612-MTBD GPS&Beidou Receiver Module 7 Appendix References Table 16: Terms and Abbreviations Abbreviation Description AGNSS Assisted Global navigation satellite system Active Interference Cancellation Circular Error Probable DGPS Differential GPS EASY Embedded Assist System EGNOS European Geostationary Navigation Overlay Service Extended Prediction Orbit...

  • Page 30: Nmea 0183 Protocol

    GT-1612-MTBD GPS&Beidou Receiver Module UART Universal Asynchronous Receiver & Transmitter VDOP Vertical Dilution of Precision Course over Ground and Ground Speed, Horizontal Course and Horizontal Velocity WAAS Wide Area Augmentation System Inom Nominal Current Imax Maximum Load Current Vmax Maximum Voltage Value...
  • Page 31 GT-1612-MTBD GPS&Beidou Receiver Module The Gotop GT-1612-MTBD Initialization location mode for GPS&Beidou dual mode,  Output data：$GNRMC. $GNGGA. $GPGSV. $BDGSV. $GPGSA. $BDGSA. $GNGLL. $GNVTG 8.2 NMEA-0183 data Detailed field 8.2.1 GGA-Global Positioning System Fixed Data $xxGGA, 161229.487,3723.2475,N, 12158.3416,W, 1,07,1.0,9.0,M.0000*18 Table 18: GGA Data Format...
  • Page 32 GT-1612-MTBD GPS&Beidou Receiver Module 8.2.2 GLL-Geographic Position – Latitude/Longitude $xxGLL , 3723.2475, N,12158.3416, W,161229.487, A*2C. Table 19: GLL Data Format Name Example Units Description Message ID $xxGLL GLL protocol header Latitude 3723.2475 ddmm.mmmm N/S Indicator N=north or S=south Longitude 12158.3416 dddmm.mmmm...
  • Page 33 GT-1612-MTBD GPS&Beidou Receiver Module Table 20-2: Mode 2 Value Description Manual-forced to operate in 2D or 3D mode Automatic-allowed to automatically switch 2D/3D 8.2.4 GSV-GNSS Satellites in View $xxGSV , 2, 1, 07, 07, 79,048, 42, 02, 51,062, 43, 26, 36,256, 42, 27, 27, 138,42*71 $xxGSV, 2, 2, 07, 09, 23,313, 42, 04, 19, 159, 41, 15,12,041, 42*41.
  • Page 34 GT-1612-MTBD GPS&Beidou Receiver Module N/S Indicator N=north or S=south Longitude 12158.3416 dddmm.mmmm E/W Indicator E=east or W=west Speed Over Ground 0.13 Knots Course Over 309.62 Degrees True Ground Date 120598 Dummy Magnetic variation Degrees E=east or W=west Check sum <CR> <LF>...
  • Page 35 (‘Gotop’). Information provided by Gotop is believed to be accurate and reliable. These materials are provided by Gotop as a service to its customers and may be used for informational purposes only. Gotop assumes no responsibility for errors or omissions in these materials, nor for its use. Gotop reserves the right to change specification at any time without notice.

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