GlobalTop MT3333 Series Application Note Download Page 1

Page: 1 / 45

Ver. A05

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.

No.16 Nan-ke 9

Rd, Science-Based Industrial Park, Tainan, 741, Taiwan, R.O.C.

Tel

: +886-6-5051268 / Fax: +886-6-5053381 / Email

GlobalTop Technology Inc.

GNSS Module
Application Note
(MT3333 series)

Revision: A05

l Doc

ent

Reference layout, design tips, guides, and cautions for GlobalTop GNSS modules.

Summary of Contents for MT3333 Series

Page 1: ...ithout prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved No 16 Nan ke 9 th Rd Science Based Industrial Park Tainan 741 Taiwan R O C Tel 886 6 5051268 Fax 886 6 5053381 Email sal...

Page 2: ...MT3333 series GlobalTop Technology Ver A05 Version History Title GlobalTop GNSS Module Application Notes MT3333 series Subtitle GNSS Module Doc Type Technical Document Revision Date Editor Descriptio...

Page 3: ...Serial Interface 10 a UART 0 RX TX 10 b I2C SCL SDA 10 c SPI CS CLK MISO MOSI 11 2 1 4 GND Ground 11 2 1 5 Antenna Compliance Design 12 2 1 6 1PPS 16 2 1 7 3D_Fix 17 2 2 Layout Guideline 19 2 2 1 Lay...

Page 4: ...ls or besides any huge objects the GNSS signals might be weakened cut off or disturbed Do not assume the receiver is malfunctioned should the mentioned situation occurs This application note provides...

Page 5: ...tain information yet you do not find it elsewhere in our documents please feel free to contact us When writing to us please follow the form below to help us better serve you 1 Your company name and we...

Page 6: ...application note is to assist system developer and integrator to get familiar with MT3333 chip based GlobalTop receiver modules during the process of implementation This document covers the following...

Page 7: ...without prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 s...

Page 8: ...les 2 1 Circuit Design Compatible Models Gmm g3 Gmm g3 B Gms g6a Gms g9 Gms g6 Gms b6 PA6E CAM Gmm 3301 2 1 1 Power supply VCC Providing a clean and stable power supply is required for the GNSS module...

Page 9: ...hort term with this backup power the GNSS module is capable of succeeding a faster TTFF shorter Time to First Fix and short hot start time after the power is regained For most system it is recommended...

Page 10: ...tor is wire wound component it may function as choke coil 3 Please do not connect diode s to RX TX as it will decrease signal driving capability which might adversely affect RX TX signal level In some...

Page 11: ...ND Ground Compatible Models Gmm g3 Gmm g3 B Gms g6a Gms g9 Gms g6 Gms b6 PA6E CAM Gmm 3301 Make sure all GND pins of the module are connected to a good ground plane The separation of ground between GN...

Page 12: ...ntenna is a standalone device integrates with LNA and patch antenna with a RF cable for higher gain and better performance than that of passive antenna Antenna can be chosen according to radiation eff...

Page 13: ...ace thus we can use the RF trace to transport both RF signal and DC voltage To fully achieve this we use a RF chock coil to couple the DC power to RF trace For your reference in general GlobalTop modu...

Page 14: ...t without prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333...

Page 15: ...ithout prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 External Antenna of Specification When selectin...

Page 16: ...mware customization for pulse width duration is available 1PPS signal and its pulse width with 100ms duration Free run 1PPS output before 3D_FIX GlobalTop standard GNSS module outputs 1PPS signal afte...

Page 17: ...For 1PPS LED indication user may connect a LED indicator with a 330ohm resistor in series 1PPS signal design for IO 2 1 7 3D_Fix Compatible Model Gmm g3 Gmm g3 B Gms g6a Gms g9 Gms g6 Gms b6 PA6E CAM...

Page 18: ...c Specifications subject to change without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 For 3D_Fix...

Page 19: ...Gms g9 Gms g6 Gms b6 PA6E CAM Gmm 3301 In general GNSS modules have high receiving sensitivity at around 165dBm During the hardware integration try to avoid noise or harmonic in these bands to prevent...

Page 20: ...without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 GNSS module on a clean GND plane For modules G...

Page 21: ...MT3333 series GlobalTop Technology Ver A05 2 2 2 Keep far away from high profile or metal canned components Compatible Model Gms g6a Gms g9 Gms g6 Gms b6 PA6E CAM It is good practice to place GNSS mo...

Page 22: ...e distributed reproduced into any other format without prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice Copyright 2013 GlobalTop Technology Inc All Rights R...

Page 23: ...module Place the damping resistors for TX RX close to GNSS module Do not place GNSS module in proximity to high speed digital processing circuitry GNSS module in proximity to high current switching po...

Page 24: ...nent at one corner of the board while placing analog and quiet components at the opposite corner of the board Make sure there is no crossing of microstrip or current between the two component sets wit...

Page 25: ...sign 2 Compatible Model Gms g6a For Gms g6a A built in Chip Antenna module a special ground plane is required to improve chip antenna reception performance As shown in the figure the area circled wher...

Page 26: ...ge without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 Variation in reception sensitivity accordin...

Page 27: ...ing case of the host device should not be made of or include any conductive material for the basic antenna reception 2 The host device should not be placed underneath of a conductive material such as...

Page 28: ...Application Notes MT3333 series GlobalTop Technology Ver A05 3 Thermal Profile for SMD Modules The following information is Pb Free compliant The details are for reference only SMT Reflow Soldering Te...

Page 29: ...2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 SMT Solder Mask Please use the dimension of PCB pad as reference and shrink...

Page 30: ...rrently not working Please double check your schematic design The list down below is a go through list of possible items to check Item 1 VCC The voltage should be kept between 3V to 4 3V Typical 3 3V...

Page 31: ...thout prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice Copyright 2013 GlobalTop Technology Inc All Rights Reserved GNSS Module Application Notes MT3333 seri...

Page 32: ...nology Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 5 Contact For help or further information please contact us via the following methods GlobalTop...

Page 33: ...ation Notes MT3333 series GlobalTop Technology Ver A05 Appendix I Super Capacitor Design About Super Capacitors Super capacitor has lifetime similar to that of aluminum electrolytic capacitor The serv...

Page 34: ...A05 Appendix II 50 Antenna Matching We used AppCAD tool to simulate 50 impedance for RF PCB layout RF line width W PCB FR4 Thickness H Dielectric parameter Copper Thickness an ounce 1 8mm 1mm 4 6 0 0...

Page 35: ...balTop Technology Ver A05 Appendix III UART to RS232 Interface Typically RS232 or USB interface is required to connect the PC to the GlobalTop GNSS module for communication Majority of GlobalTop modul...

Page 36: ...ce possibly it is designed to connect the module to an external USB IC To further enhance the transferring speed use one that is capable of USB version 2 0 Once the driver for the chosen USB Bridge IC...

Page 37: ...h a long cable which will result in 1PPS signal degradation increase in noise and increase in signal delay As the 1PPS signal traveling through the communication cable impedance matching must be imple...

Page 38: ...ogy Inc All Rights Reserved GNSS Module Application Notes MT3333 series GlobalTop Technology Ver A05 1PPS Delay Time When using coaxial cable for long distances communication using OP amp for amplific...

Page 39: ...Technology Ver A05 The delay time cause by the cable Calculating the delay time in respect to the communication cable length The simplest method to calculate this is to have a good grasp on the relat...

Page 40: ...gth to test For example the signal travels in 1 meter of coaxial cable can have its delay time measured by the oscilloscope as 5ns and consequently the will be 2 108 If the value of capacitance and in...

Page 41: ...ommended OP amp If inadequate OP amp is chosen i e with low slew rate the delay at the rising time introduced to the waveform can be significantly larger than that of the coaxial wire We recommend usi...

Page 42: ...round the GPS module are displaying symptoms of cold weld ing or false welding 3 Special attentions are needed for PCBA board during reflow soldering to see if there are any symptoms of bending or def...

Page 43: ...Cut process is not available and the pieces must be separated manually please make sure the operators are not using excess force which may cause rotational offset to the patch antennas 1 The blade and...

Page 44: ...C standards for related documentation and examples 4 When performing solder paste printing please notice if the amount of solder paste is excessive or insufficient as both conditions may lead to defec...

Page 45: ...erature before use so it can return to its optimal working temperature The time required for this procedure is unique and dependent on the properties of the solder paste used 3 The steel plate must be...

Search results

Summary of Contents for MT3333 Series

Reviews:

Related manuals for MT3333 Series

Brands by name

Popular brands

GlobalTop MT3333 Series, Application Note

Search results

Summary of Contents for MT3333 Series

Reviews:

Related manuals for MT3333 Series

Brands by name

Popular brands