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
4. Troubleshooting
How to check for the working status of
The first thing to check for is the NMEA sentence output
For example: you may use windows default tool
application program.
If there is no NMEA output at the TX pin
Please double check your schematic design. Down below
check.
Item 1: VCC
The voltage should be kept between
Item 2: VBACKUP
The voltage should be kept between 2.0V~4.3V.
the VBACKUP pin, the pin could
recharging circuit. It is recommended
running and stored navigation data
Item 3: 3D-FIX
If all the measurements are within the specifications, p
Fix,
the pin should output 1 second high follow
Notes:
This is not applicable to those with customized 1PPS which has an
configuration as described in “Free run 1PPS
Item 4: TX0
The UART transmitter of the module, it out
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)
. Troubleshooting
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 or you
the TX pin, this indicates that the module is currently not working.
Please double check your schematic design. Down below are a go through list of
The voltage should be kept between 3V to 4.3V.
(Typical: 3.3V)
.
Please double-check.
The voltage should be kept between 2.0V~4.3V.
(Typical: 3.0V).
If backup battery
, the pin could still be measured as the voltage comes from the
recommended to provide power to VBACUP pin as it is used
navigation data.
Please double-check
If all the measurements are within the specifications, please also measure 3D-FIX
second high followed by 1 second low signal.
This is not applicable to those with customized 1PPS which has an always
Free run 1PPS” in
section 2.1.6 1PPS
.
UART transmitter of the module, it outputs the GPS NMEA information for application.
22
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
using various application tools.
or you may use other GPS
the module is currently not working.
possible items to
check.
battery is not installed for
comes from the built-in battery
pin as it is used to keep RTC time
FIX signal. Before 2D
always 1PPS signal
nformation for application.
