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This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other 

prior permission of GlobalTop Tech Inc

Copyright © 201

 

GPS Module Application Notes

GlobalTop Technology 

If the speed of the waveform (in coaxial cable) is unknown, it is possible to use a 

length to test. For example, the signal travel

measured by the oscilloscope as 5ns

If the value of capacitance and inductance 

calculated. 

 

 

Moreover, more other coaxial cable electromagnetic

and outer diameter of the physical

calculations. 

 

Waveform rising time caused by

 

 

his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other 

prior permission of GlobalTop Tech Inc. Specifications subject to change without prior notice.

2014 GlobalTop Technology Inc. All Rights Reserved.

Module Application Notes (MT3337 series) 

If the speed of the waveform (in coaxial cable) is unknown, it is possible to use a 

r example, the signal travels in 1 meter of coaxial cable can have its delay time 

ured by the oscilloscope as 5ns and consequently the 

will be 2 * 10

(m/s

and inductance for the coaxial cable is known, then 

coaxial cable electromagnetic fundamental parameters along 

physical cable can be used in combination to perform theoretical 

Waveform rising time caused by OP-amp 

 

The left figure shows Slew Rate: 

which is the time needed for 

rising waveform. When the SR 

(V/

µ

sec) of OPA is higher, the 

rising time will be shortened as 

well. 

             

31    

        

his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other format without 

Specifications subject to change without prior notice. 

GlobalTop Technology Inc. All Rights Reserved. 

Ver. A00 

If the speed of the waveform (in coaxial cable) is unknown, it is possible to use a known coaxial cable 

in 1 meter of coaxial cable can have its delay time 

(m/s). 

 (m/s) can also be 

parameters along with the inner 

m theoretical 

The left figure shows Slew Rate: 

which is the time needed for 

rising waveform. When the SR 

sec) of OPA is higher, the 

rising time will be shortened as 

Содержание MT3337 Series

Страница 1: ...be distributed reproduced permission of GlobalTop Tech Inc Specifications subject to change without prior notice GlobalTop Technology Inc All Rights Reserved Rd Science Based Industrial Park Tainan 74...

Страница 2: ...Top Tech Inc and should not be distributed reproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Righ...

Страница 3: ...Caution for Reflow Soldering Process his document is the exclusive property of GlobalTop Tech Inc and should not be distributed reproduced into any other prior permission of GlobalTop Tech Inc Specifi...

Страница 4: ...Technology Inc All Rights Reserved Module Application Notes MT3337 series read carefully before you start If you use GPS receiver inside buildings tunnels or besides any huge objects the GPS off or di...

Страница 5: ...ns subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Technical Support If you have any technical problems or cannot find t...

Страница 6: ...s the exclusive property of GlobalTop Tech Inc and should not be distributed reproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014...

Страница 7: ...ifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series 2 General Rules for Design in In order to obtain good GPS per...

Страница 8: ...applications for applying VBACKUP to GPS module when the main power is not supplied to keep RTC running and navigation data For a short term VCC off with this backup power the GPS module is capable of...

Страница 9: ...n Notes MT3337 series Serial Interface PA6C R interface that carries the baud rate ranging from 4800 bps to 115200 bps the RX and TX of the GPS module could limit the interference host MCU or high spe...

Страница 10: ...small form factor with low cost There are two types Passive antenna is solely antenna by itself without signal amplifier such as LNA Examples are p If you have your own patch antenna it is required t...

Страница 11: ...es MT3337 series architecture with GPS module needs a DC power to have it work properly is to feed a DC into the RF trace and the External Antenna extracts the RF trace to transport both RF signal and...

Страница 12: ...pecifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Module Antenna_IN VANT RF External Antenna Antenna Power F...

Страница 13: ...cation Notes MT3337 series r1 PA6C R 1PPS signal is an output pulse signal used for timing application Its electrical characteristic 100ms pulse width duration Firmware customization for customized pu...

Страница 14: ...into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Fo...

Страница 15: ...Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series For 3D_Fix indication user may connect a LED with a 330o...

Страница 16: ...ecifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series 2 2 Layout Guideline guideline for the right GPS module whe...

Страница 17: ...be distributed reproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Applicati...

Страница 18: ...ect to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Keep far away from high profile or metal canned components GPS module far aw...

Страница 19: ...oduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 ser...

Страница 20: ...st to follow these typical rules segmentation of ground between digital and analogue system high current and low current system such as GPS and GPRS One way to segment the ground is to place digital a...

Страница 21: ...ted reproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT...

Страница 22: ...ooting to check for the working status of GPS module The first thing to check for is the NMEA sentence output through TX using various application tools use windows default tool Hyperterminal in WinXP...

Страница 23: ...eproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337...

Страница 24: ...ecifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Super Capacitor Design lifetime similar to that of aluminum...

Страница 25: ...fications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series Antenna Matching to simulate 50 impedance for RF PCB layout PC...

Страница 26: ...ct to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series UART to RS232 Interface RS232 or USB interface is required to connect the PC...

Страница 27: ...y Inc All Rights Reserved Module Application Notes MT3337 series UART to USB Interface the GlobalTop module you have purchased do not come with a USB interface it is possible to an external USB IC To...

Страница 28: ...Notes MT3337 series How to efficiently transfer 1PPS through extended distances when transferring 1PPS signal through a long cable increase in noise and increase in signal delay As the 1PPS signal th...

Страница 29: ...ermission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series When using coaxial cable...

Страница 30: ...ce 2014 GlobalTop Technology Inc All Rights Reserved Module Application Notes MT3337 series The delay time cause by the cable in respect to the communication cable length The simplest method to calcul...

Страница 31: ...to use a r example the signal travels in 1 meter of coaxial cable can have its delay time ured by the oscilloscope as 5ns and consequently the will be 2 108 m s and inductance for the coaxial cable i...

Страница 32: ...and should not be distributed reproduced into any other prior permission of GlobalTop Tech Inc Specifications subject to change without prior notice 2014 GlobalTop Technology Inc All Rights Reserved M...

Страница 33: ...ng temperature profile Double check to see if the surrounding components around the GPS module are displaying symptoms of cold weld ing false welding Special attentions are needed for PCBA soldering t...

Страница 34: ...ng the PCBA under high temperature 1 When separating the PCBA panel into Cut process special attentions are needed to ensure there are sufficient gap between Cut process is not available and the piece...

Страница 35: ...ion line and storage area Temperature of 23 C 60 5 RH humidity is recommended please refer to IPQC for related documentation and examples When performing solder paste printing please notice if the amo...

Страница 36: ...ering pads on the surface of the PCB board The solder paste must be defrosted to room temperature before use so it can return to its rking temperature The time required for this procedure is unique an...

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