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1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodGPS™ Reference Manual

Revised April 12, 2016

This manual applies to the PmodGPS rev. A

DOC#: 502-237

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 6

Overview

The PmodGPS can add satellite positioning accuracy to any embedded system. The PmodGPS features a GlobalTop

FGPMMOPA6H GPS antenna module that utilizes the MediaTek GPS MT3329.

1 Functional Description

The PmodGPS uses a standard 6-pin port and communicates via a 2-wire Universal Asynchronous

Receiver/Transmitter (UART.) The PmodGPS also has a 2-pin port for control of the NRST pin to the module and the

Radio Technical Commission for Maritime services, or RTCM pin for Differential Global Positioning System (DGPS)

data using RTCM protocols.

Note: The PmodGPS arrives with the RTCM feature inactive, to enable RTCM capabilities users should contact

GlobalTop at: www.gtop-tech.com.

The PmodGPS.

 Ultra-sensitive GPS module (-165 dBm)

 Add 3m 2D satellite positioning

accuracy to any embedded system

 Low power consumption

 Up to 10Hz update rate

 NMEA (default) and RTCM protocols

available

 Small PCB size for flexible designs 2.0 in

× 0.8 in (5.0 cm × 2.0 cm)

 6-pin Pmod port with UART interface

 Library and example code available

in resource center

Features include:

Summary of content (6 pages)

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodGPS™ Reference Manual Revised April 12, 2016 This manual applies to the PmodGPS rev. A Overview The PmodGPS can add satellite positioning accuracy to any embedded system. The PmodGPS features a GlobalTop FGPMMOPA6H GPS antenna module that utilizes the MediaTek GPS MT3329.
PAGE 2
PmodGPS™ Reference Manual 2 Interfacing with the Pmod The PmodGPS uses UART protocol for data transmission and reception. The interface operates at a default baud rate of 9.6 kBd, 8 data bits, no parity, and with single stop bits. However, users can change the baud rate to predefined values that range from 4.8 kBd to 115.2 kBd. The reset pin (NRST) on J2 allows normal operation in active low. If users toggle the NRST pin it will completely reset the module.
PAGE 3
PmodGPS™ Reference Manual The PmodGPS uses sentences based on National Marine Electronics Association (NMEA) protocols for data output. Each NMEA message begins with a ($) dollar sign. The next five characters are the talker ID and the arrival alarm. The PmodGPS talker ID is “GP” and the arrival alarm is the specific sentence output descriptor. Individual comma separated data fields follow these five characters. After the data fields there is an asterisk followed by a checksum.
PAGE 4
PmodGPS™ Reference Manual 3 Output Sentences Example $GPGGA 064951.000 2307.1256 N 12016.4438 E 1 8 0.95 39.9 M 17.8 M *65 Description Message ID UTC Time (hhmmss.sss) Latitude (ddmm.mmmm) N/S indicator Longitude (dddmm.mmmm) E/W indicator Position Fix Indicator Satellites used HDOP MSL Altitude Units Geoidal Separation Units Age of Diff. Corr. Checksum End of message indicator Table 2. GGA. $GPGGA,064951.000,2307.1256,N,12016.4438,E,1,8,0.95,39.9,M,17.
PAGE 5
PmodGPS™ Reference Manual $GPGSA,A,3,29,21,26,15,18,09,06,10,,,,, 2.32,0.95,2.11*00 Example $GPGSV 3 1 09 29 36 029 42 …. 15 21 321 39 *7D Description Message ID Number of Messages Message Number Satellites in View Satellite ID (CH1) Elevation (CH1) Azimuth (CH1) SNR (C/No) Satellite ID CH(4) Elevation (CH4) Azimuth (CH4) SNR (C/No) Checksum End of message indicator Table 4. GSV. $GPGSV,3,1,09,29,36,029,42,21,46,314,43, 26,44,020,43,15,21,321,39*7D Example $GPRMC 064951.
PAGE 6
PmodGPS™ Reference Manual Example $GPVTG 165.48 T Description Message ID Course (degrees) Reference (true or false) Course (degrees) Reference (Magnetic) Speed Units (N = knots) Speed Units (K = km/hr) Mode (see GlobalTop manual) Checksum End of message indicator M 0.03 N 0.06 K A *37 Table 6. VTG. $GPVTG,165.48,T,,M,0.03,N,0.06,K,A*37 4 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 2.