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28509

P1-P3P4-P6
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PAM-7Q GPS Module (#28509)
Parallax’s PAM-7Q GPS Module embeds the very capable uBlox
PAM-7Q GPS device in a project-friendly module.
The PAM-7Q GPS device gives your project the ability to
understand its position anywhere on the earth, as long as it
has a clear view of the sky. It does this by using a Global
Navigation Satellite System (GNSS), such as GPS. Its default
settings provide all the capabilities you would expect from a
GPS receiver – location fix, speed, heading, altitude
measurements, and atomic date and time. Advanced users
can reconfigure these settings for specific needs.
Parallax’s module makes the PAM-7Q device even more user-
friendly by providing a breadboard-friendly 5-pin header and
mounting holes for quick, solder-free integration into your
project. An onboard voltage regulator and buffer circuitry
provides bidirectional signal conditioning for ready use with 5
V microcontrollers. A dual-purpose power/satellite lock LED
lets you know when your GPS module is powered on and
receiving data. As a final touch, an onboard super-cap
preserves the GPS device’s almanac data for up to 30 minutes
if power is disconnected temporarily, such as when changing
your project’s batteries. Whether your project needs positional
accuracy, high speed movement estimations, high altitude
measurements, fast update rates, or just plain ease of use,
the PAM-7Q GPS Module has you covered.
PAM-7Q Features
NMEA 0183 v2.3 standard protocol
56 separate tracking channels
Up to 10 Hz max navigation update rate
<2.0 meter horizontal position accuracy
(2.5 m worst case)
Configurable time pulse signal (0.25 Hz
to 1 kHz)
Buffered UART serial communication
(3.3 V/5V safe)
50 km (~31 mi) maximum altitude
(upper stratosphere)
Super-capacitor aided start battery
backup
Key Specifications
Power requirements: 3.3 V – 5 V, 55 mA
max (typically 35 mA)
Communication: TTL Asynchronous
Serial (UART), Optional I
2
C
Operating temperature range: -40 to
+185 °F (-40° to +85° C)
Dimensions: 1.0 x 1.5 x 0.5 in
(25.4 x 38.1 x 12.7 mm)
Application Ideas
Robo-Magellan projects
Fleet tracking
Heading and speed measurements
Weather balloon tracking
Electronic pet tracking collar
Copyright © Parallax Inc. PAM-7Q GPS Module (#28509) v1.0 8/7/2014 Page 1 of 6
Pin Definitions and Ratings
Pin
Name
Function
1
GND
Ground Reference (VSS) -> 0 V
2
T_P
Time Pulse
3
RXD
Device UART Receive
4
TXD
Device UART Transmit
5
VDD
Voltage Input (3.3 V – 5.0 V)
6
SCL
Optional I
2
C Serial Clock
7
SDA
Optional I
2
C Serial Data
Symbol Quantity Minimum Typical Maximum Units
VDD
Supply Voltage
3.3
5.2
V
GND Ground reference connection 0 V
I
DD
(Ave) Average active supply current 35 mA
I
DD
(Pk) Peak instantaneous current 55 mA
VOH
Signal high transmit (TXD, T_P)
VDD
VDD + 0.5
V
VOL
Signal low transmit (TXD, T_P)
GND
VDD × 0.15
V
VIH
Signal high receive (RXD)
VDD
40
V
VIL
Signal low receive (RXD)
GND
0.7
V
V
SCL
I
2
C Clock Signal
3.3
V
V
SDA
I
2
C Data Signal
3.3
V
Quick Start Circuit
The PAM-7Q GPS Module can be interfaced with many common microcontrollers or computers, including
the Propeller, BASIC Stamp, Arduino, PIC, Raspberry Pi, Beaglebone, and more. At minimum, you can
begin receiving data from the module by connecting the power pins, VDD and GND, and by making a
connection with the module’s transmit pin, TXD. If you want to change any of the module’s settings, you
will need to connect a signaling pin from your device to the module’s receive pin, RXD.
Voltage Supply and Signaling Levels
You can power the module at common TTL voltage levels, between 3.3 V and 5.0 V. The module’s
voltage supply and communication voltage level is provided by the VDD pin. The module’s onboard
regulator and buffer circuitry appropriately condition incoming and outgoing communication signals. So,
output signals will be matched to VDD’s voltage, and input signals will be conditioned to 3.3 V so as not
to damage the uBlox GPS device. Note that the optional SCL and SDA lines are not conditioned; see the
Other Features and Precautions section, page 5.
Copyright © Parallax Inc. PAM-7Q GPS Module (#28509) v1.0 8/7/2014 Page 2 of 6
Default Settings
The device comes preconfigured with these default settings. See the sections that follow for details about
these defaults. Full information about configurable options can be found in the PAM-7Q manufacturer’s
datasheet.
Output Data: 0183 NMEA standard sentences
o RMC
o VTG
o GGA
o GSA
o GSV
o GLL
Update Rate: 1 Hz fix update rate
Navigation Mode: Continuous
Time Pulse Output: 1 Hz time pulse output on T_P pin, 10% duty cycle
Communication Protocol: 9,600 baud TTL Asynchronous Serial (UART) communication
o True mode (active high)
o 1 start bit
o 8 data bits
o 1 stop bit
o No parity
Output Data
By default, the PAM-7Q GPS Module outputs NMEA 0183 v2.3 protocol standard sentences. As soon as
the module is powered, a series of ASCII strings are sent from the module’s TXD pin, representing fix
information.
The module will output the following NMEA strings by default:
RMC: Recommended minimum data for GPS
VTG: Vector track and speed over the ground
GGA: Fix information
GSA: Overall satellite data
GSV: Detailed satellite data
GLL: Latitude/Longitude data
These NMEA sentences and others can be turned on or off optionally by issuing special UBX commands to
the module. See the Communication Protocol section and uBlox’s Receiver Description Protocol
Specification document for more information.
At initial power-on, the PAM-7Q GPS module also transmits a set of special messages that describe the
GPS device hardware. These messages carry a non-NMEA-standard “TXT” prefix, yet follow the same
checksum rules defined by the standard. If your application demands verification of the module, you can
parse this information as needed. These strings contain no relevant fix information.
This is an example of the module’s power-on hardware summary:
$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50
$GPTXT,01,01,02,HW UBX-G70xx 00070000 EFFFFFFFo*1B
$GPTXT,01,01,02,ROM CORE 1.00 (59842) Jun 27 2012 17:43:52*59
$GPTXT,01,01,02,PROTVER 14.00*1E
$GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20
$GPTXT,01,01,02,ANTSTATUS=DONTKNOW*33
Copyright © Parallax Inc. PAM-7Q GPS Module (#28509) v1.0 8/7/2014 Page 3 of 6
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28509

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Description:
GPS Modules PAM-7Q GPS Module
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