GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
1
1 INTRODUCTION
The GNS3301 module supports GPS and GLONASS simultaneously. With a very small form factor of
just 10.0 by 9.3 by 2.0 mm, GNS3301 is an ideal GNSS solution for many applications.
GNS 3301 is based on the advanced new generation MediaTek MT3333 GNSS chip. First Fixes after
just a few seconds are achieved with the help of A-GPS using EPOTM (Extended Prediction Orbit)
and the EASYTM “self generated orbit prediction” algorithm. EASYTM
(Embedded Assist System) does not require any resources and
does not need any information from the network.
Due to its capability to use GLONASS and GPS at the same time,
GNS3301 benefits from the higher availability of satellites in critical
environments.
The navigation performance and accuracy is further improved by
using the correction data from SBAS (WAAS, EGNOS, GAGAN,
MSAS), QZSS or DGPS(RTCM).
The low power design makes it easy to implement this module in power sensitive, battery supplied
applications. Very low power requirements (typ 66mW@ 3.3V) and internal voltage regulator makes
it easy to run the module with various power supplies and allows direct connection to LiIon
batteries.
Further power savings re possible with AlwaysLocateTM power management feature. It adaptively
adjusts power consumption depending on the environment and motion conditions, in order to
achive a balance between fix rate, power consumption and position accuracy.
In professional timing applications the outstanding high accuracy PPS (pulse per second) hardware
pin is used for synchronization to GPS second. Typical accuracy is 10ns RMS jitter.
GNS3301 offers the industry’s highest level of navigation sensitivity down to -165dBm. It has
superior dynamic performance at high velocity and provides effective protection against
interference signals using MTAICTM ( Multi-tone active interference canceller). Up to 12 independent
channel interference continuous wave jammers can be eliminated or reduced.
The embedded logger function LOCUS with a 16-hrs on chip memory makes this GNSS module a
complete track logger for many applications.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
2
Features
• GLONASS and GPS simultaneously
• 99 acquisition-/ 33 tracking channels
• Ultra high tracking/navigation sensitivity: -165dBm
• Extremely fast TTFF at low signal level
• QZSS, SBAS (WAAS,EGNOS,MSAS,GAGAN) or DGPS(RTCM) correction support
• A-GPS by EPO “Extended Prediction Orbit” TM enables 7/14days prediction
• 12 Multitone Active Interference Canceller (MTAIC) for GPS-in-band jammer rejection
• EASY TM : Self generated orbit prediction support
• AlwaysLocate TM : Intelligent Algorithm for power saving
• Embedded logger function
• High accuracy 1PPS output
• NMEA-0183 or binary protocol
• High update rate (up to 10/s)
• GPS+GLONASS Consumption current(@3.3V):
Acquisition: 28mA typical
Tracking: 20mA typical
• Low backup current consumption 15uA, typical
• SMD type , stamp type adaptor availble
• Small form factor: 10x9.3x2.0 mm
Applications
Navigation
o In-vehicle Navigation equipment
o Dynamic Navigation
o Portable (“nomadic”) devices
o Netbooks, tablet PCs and mobile phones
Timing
o Precision timing via GPS
Location based applications
o GPS Logger
o GPS Tracker
o Security devices
o Camera equipment
o Geofencing
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
3
2 INDEX
1 INTRODUCTION ----------------------------------------------------------------------------------------- 1
2 INDEX --------------------------------------------------------------------------------------------------- 3
3 FUNCTIONAL DESCRIPTION ---------------------------------------------------------------------------- 4
3.1 Block diagram -------------------------------------------------------------------------------------------------------------- 4
3.2 System description --------------------------------------------------------------------------------------------------------- 4
3.3 GPS and GLONASS simultaneous operation ------------------------------------------------------------------------------ 5
3.4 Power Management Features ---------------------------------------------------------------------------------------------- 5
3.5 Logger function ------------------------------------------------------------------------------------------------------------- 7
3.6 Active interference cancellation (MTAIC) --------------------------------------------------------------------------------- 8
3.7 AGPS with EPOTM data ------------------------------------------------------------------------------------------------------ 9
3.8 EASYTM self generated prediction data feature -------------------------------------------------------------------------- 10
3.9 Pulse Per Second (PPS) -------------------------------------------------------------------------------------------------- 10
3.10 SBAS (Satellite Based Augmentation) support ------------------------------------------------------------------------- 11
3.11 DGPS (Differential GPS) support ---------------------------------------------------------------------------------------- 11
3.12 GPS almanac and ephemeris data--------------------------------------------------------------------------------------- 11
3.13 Real time clock (RTC) ---------------------------------------------------------------------------------------------------- 11
3.14 UART interface ------------------------------------------------------------------------------------------------------------ 11
3.15 Module default settings -------------------------------------------------------------------------------------------------- 12
4 TYPICAL APPLICATION BLOCK DIAGRAM ------------------------------------------------------------ 13
4.1 Typical System overview ------------------------------------------------------------------------------------------------- 13
5 GNSS characteristics ---------------------------------------------------------------------------------- 14
5.1 GNSS characteristics ----------------------------------------------------------------------------------------------------- 14
6 DESIGN GUIDELINES --------------------------------------------------------------------------------- 15
6.1 General -------------------------------------------------------------------------------------------------------------------- 15
6.2 GPS and GLONASS antenna --------------------------------------------------------------------------------------------- 15
7 ELECTRICAL SPECIFICATION ------------------------------------------------------------------------- 16
7.1 Absolute Maximum Ratings ---------------------------------------------------------------------------------------------- 16
7.2 Recommended Operating Conditions ----------------------------------------------------------------------------------- 16
7.3 GPS/GLONASS input characteristics ------------------------------------------------------------------------------------ 16
8 DEVICE PINOUT DIAGRAM --------------------------------------------------------------------------- 17
8.1 Pin configuration --------------------------------------------------------------------------------------------------------- 17
8.2 Pin assignment ----------------------------------------------------------------------------------------------------------- 18
9 NMEA DATA interface --------------------------------------------------------------------------------- 19
9.1 NMEA output sentences for GPS and GLONASS ------------------------------------------------------------------------ 19
9.2 NMEA command interface------------------------------------------------------------------------------------------------ 20
10 PHYSICAL DIMENSIONS ----------------------------------------------------------------------------- 21
11 RECOMMENDED PAD LAYOUT ----------------------------------------------------------------------- 22
12 MATERIAL INFORMATION --------------------------------------------------------------------------- 23
13 RECOMMENDED SOLDERING REFLOW PROFILE --------------------------------------------------- 23
14 PACKAGE INFORMATION ---------------------------------------------------------------------------- 24
15 TAPE&REEL INFORMATION -------------------------------------------------------------------------- 24
16 REEL INFORMATION --------------------------------------------------------------------------------- 25
17 ORDERING INFORMATION -------------------------------------------------------------------------- 26
18 ENVIRONMENTAL INFORMATION ------------------------------------------------------------------- 26
19 MOISTURE SENSITIVITY ---------------------------------------------------------------------------- 27
20 DOCUMENT REVISION HISTORY -------------------------------------------------------------------- 27
21 RELATED DOCUMENTS ------------------------------------------------------------------------------ 27
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
4
3 FUNCTIONAL DESCRIPTION
3.1 Block diagram
3.2 System description
The GNS3301 core is a high performance, low power GPS and GLONASS receiver that includes an
integrated RF frontend. The receiver can process two GNSS systems simultaneously, which
improves the availability of usable satellites in critical reception scenarios.
Due to high input sensitivity it can work directly with a passive antenna.
GNS3301 is a complete GNSS engine, including:
- Full GPS and GLONASS processing without any host processing requirements
- Standard NMEA message output
- A powerful command and control interface
- All clock sources integrated on module
- RF frontend for direct connection of passive or active antennas
- Complete integrated logger function
- Interfaces for DGPS, PPS, Fix Status Indicator
GPS/
GLONASS
chip
32.768kHz
crystal
26.0MHz
TCXO
SAW
filter
GND 4,E1,E2
5
RF In
1PPS
13
8
3D-Fix
11
10
RXDB
TXDA
9
RXDA
VCC
16
15
VBackup
3
RESET
Wakeup
6
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
5
3.3 GPS and GLONASS simultaneous operation
GNS3301 supports tracking of the GPS and the GLONASS satellite system at one time. This feature
enhances the overall performance significantly.
Increased availability of satellites
Increased spatial distribution allows better geometrical conditions
Reduced Horizontal (HDOP) and Vertical Dilution of Precision (VDOP) factors
In GPS-only operation, a minimum of 3 SVs is needed to determine a 2D position fix solution. When
using both systems, 5 SVs are needed to determine the four unknowns and one more SV to
calculate the GPS/GLONASS time offset.
Using a combined receiver, users have an access to potentially 48 or more satellites. This high
number of satellites can overcome the typical problems of restricted visibility of the sky, such as in
urban canyons or indoor scenarios.
3.4 Power Management Features
Power management schemes implemented for any GNSS system requires an optimally tuned
performance for both accuracy of the position fixes and the average power consumed for best user
experience. GNS3301 architecture achieves these both aspects by providing flexibility and design
choices for the system integration, based on wide range of use cases and by leveraging on the
proven silicon methodologies. Also GNS3301 provides position, velocity and time measurements
without any host loading. This, coupled with the optional built-in power management options,
reduces the overall system power budget.
Selectable Power management features:
In Standby mode RF frontend and internal MPU are switched to deep sleep state. Power
consumption is reduced to 0.6 mW (200µA).This state can be entered by sending the NMEA
command: $PMTK161,0*28<CR><LF>.
Leaving standby mode and resuming to normal operation will be managed by sending any
byte to the module.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
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Backup mode can be entered by sending NMEA command: $PMTK225,4*2F<CR><LF>.
The GPS/GLONASS core will shut down autonomously to backup state, Vcc supply can now
be switched off by an external power supply switch.
Periodic mode describes a power mode, which will autonomously power on/off the module
in programmable time slots with reduced fix rate. Periodic mode is useful during stationary
operation or if position fixes are just needed from time to time. Since power consumption in
GPS off times is nearly zero, the power consumption in periodic mode can be estimated by
Ptracking * (ton/(ton+toff)).
Periodic mode is controlled with NMEA command $PTMK225. See document
NMEA_Interface_manual_MTK_V.. for programming details.
AlwaysLocateTM feature provides an optimized overall GPS system power consumption in
tracking mode under open sky conditions. Always Locate is an intelligent control of periodic
mode. Depending on the environment and motion conditions, GNS3301 can adjust the
on/off time to achieve balance of positioning accuracy and power consumption. The best
power saving will be made under good reception in stationary mode. Critical reception
conditions and dynamic movements will need full activity of the GNSS engine which causes
nominal power requirements (22mA typ in tracking mode).
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
7
3.5 Logger function
GNS3301 provides an autonomous logger function that automatically stores position information in
an internal 128kB flash memory. A complete tracking unit can be realized without any external CPU
or memory.
The parameters for logging are programmable via the NMEA command interface. The following
parameter can be set to optimize logging time:
- logger rate
The commands for logger include:
- start logging
- stop logging
- erase memory
- readout memory
please refer to the NMEA_Interface_manual_MTK_V.. for details.
Logger firmware options (on request)：
The logger is configured to record the “Basic” content by default.
Other content setting can be ordered as firmware options.
The following options can be statically defined by firmware build.
Please note that firmware options are bound to MOQ.
Logger content options
Name
Record
size
Content
UTC
fixtype
Lat
Lon
Alt
speed
heading
hdop
satNo
Checksum
Basic
16
O
O
O
O
O
O
Racing
20
O
O
O
O
O
O
O
O
Search
19
O
O
O
O
O
O
O
O
Saving
13
O
O
O
O
All
23
O
O
O
O
O
O
O
O
O
O
Internal Logger Function
Logger data rate
1/32000
1
1/s
Logger data memory
128
kBytes
Flash memory, allows ~8k of
“basic” data sets
Logger capacity
~8000
positions
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
8
Logger control and event options
Name
options
description
default
Logging mode
AL
Automatic logging
x
FixOnly
Logging when fix is available
x
Normal
Interval setting
1..32,000 s
The interval for logging samples
5
Distance setting
1..50,000 m
Threshold condition. A log sample is taken
when the position is changed by x meters
disabled
Speed setting
1..100 m/s
Threshold condition. A log sample is taken
when the set speed is measured.
disabled
Memory option
Stop
Logging stops when memory is full
overlap
Logging continues from beginning when
memory is full
x
3.6 Active interference cancellation (MTAIC)
Because different wireless technologies like Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth are integrated into
portable systems, the harmonic of RF signals may influence the GPS reception.
The multi-tone active interference canceller can reject external RF interference which come from
other active components on the main board, thus improving the performance of GPS reception.
GNS3301 can cancel up to 12 independent continuous wave (CW) channels having signal levels of
up to -80dBm. The functionality is enabled by default and increases power consumption by about
1mA.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
9
3.7 AGPS with EPOTM data
AGPS (assisted GPS) allows to shorten TTFF (TimeToFirstFix) by injecting ephemeris data from an
external source into the module’s memory. With the help of these data, the module does not need
to acquire satellite positions by receiving the data from the satellites.
Depending on time and position information that is still available in the module memory, the TTFF
can be reduced to just a few seconds.
The GNS AGPS service is based on a short term predicted data service. The predicted data will be
fully processed by the GPS engine, the host must load the data from the web and transfer them
over the UART to the module:
1. Check GNS3301 module EPO data for validity by comparing the time. (time parameters for
existing 3301 data can be retrieved through a NMEA command)
2. Connect to web server through network connection (GPRS, WLAN, LAN,..)
3. Download file. There are just two files, covering all GPS satellites. The first file (MTK7d.EPO)
is for 7 days (53kB), the other is 106Kbytes for 14 days (MTK14d.EPO)
4. “Parse” file, using software example. This is quite easy, there must be added some header
bytes and a checksum and a control counter. GNS offers software support on this.
5. Download to GNS3301 module. please refer to the NMEA_Interface_manual_MTK_V.. for
details
If the host has low memory available, there’s no need to save the whole file. The steps 3..5 can be
done frame by frame needing less than 2kBytes of buffer memory.
Code samples and support for several platforms are available from GNS (in preparation)
Thanks to the predicted system, download data stay valid for up to 14 days. Therefore, users can
initiate the download everytime and benefit from using (W)LAN instead of using expensive GSM.
File size will be ~50kBytes for a one week prediction data set.
AGPS characteristics
System
6hrs predicted data
File size for data download
53
kB
1 week prediction data
Maximum prediction time
7
14
days
TTFF
1
sec
Time and last position available
TTFF
15
sec
Last position available
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
10
3.8 EASYTM self generated prediction data feature
GNS3301 includes an internal prediction system, that allows to sample satellite orbit data during
operation and use that data to speed up TTFF on later starts.The prediction time frame is up to
three days forward.
Although this prediction feature does not provide the very short TTFF that is achieved using AGPS,
it can help to find a fix solution faster and in weak signal condition scenario. Prediction data will be
kept in memory as long as VBACKUP is present. This option is activated by default.
Note: The EASY functionality is only supported, if “VBACKUP” pin is conntected and the NMEA update
rate is 1Hz.
3.9 Pulse Per Second (PPS)
GNS3301 provides a Pulse Per Second (PPS) hardware output pin for timing purposes. After
calculation of a 3D position fix (default setting), the PPS signal is accurately aligned to the GPS
second boundaries. The pulse generated is approximately 100 milliseconds in duration and the
repetition rate is 1 second. On request PPS output can activated on a 2D- fix or after power-up of
the module, providing a time accuracy decreased PPS signal.
GNS3301 module provides an exceptionally low RMS jitter of typical 10 nanoseconds.
T1
T2
T1 = 100ms
T2 = 1sec
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
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11
PPS characteristics based upon a 3D-fix
1PPS pulse duration
-
100
-
msec
1PPS time jitter
-
10
nsec
RMS
Pulse rising edge deviation from
expected pulse time, measured
with full 3D fix
1PPS rise and fall time
5
nsec
10%..90%, load is 10k||5pF
3.10 SBAS (Satellite Based Augmentation) support
GNS3301 supports Satellite Based Augmentation for improvement of the navigation precision.
Correction data is sent from geostationary satellites to the GPS receiver. GNS3301 supports
European, US, and Asian augmentation systems (EGNOS, WAAS, QZSS, GAGAN, MSAS) to enable
precision improvements in nearly every region of the world.
SBAS is active by default and will automatically track the available SBAS satellites. It can be
disabled by NMEA command. See document NMEA_Interface_manual_MTK_V.. for details.
3.11 DGPS (Differential GPS) support
GNS3301 accepts DGPS input in RTCM format. DGPS provides precision position fixes down to
centimetres and is used in professional applications like agriculture. The second UART (UART_B) of
the module is used to feed the data in. DGPS is deactivated by default. For configuration of the
UART port, some NMEA commands must be implemented. See NMEA_Interface_manual_MTK_V..
document for details.
Note : Since SBAS and DGPS both do (different) corrections on the fix position solution, they
cannot be used at the same time! SBAS / DGPS usage is programmed through the NMEA Interface.
3.12 GPS almanac and ephemeris data
For quick re-acquisition of the GPS after off-times, the GPS engine should have access to almanac
and ephemeris data. This data is permanently stored inside GNS3301 module, even if all power
supplies have been removed. When the GPS is powered-up again, the data will be used to allow a
quick re-acquisition, as soon as a coarse time information is available. Time will be available
immediately, when RTC is kept running.
3.13 Real time clock (RTC)
GNS3301 has a real time clock with 32,768Hz crystal onboard. As long as VBACKUP is connected to a
power source, the real time clock and the module memory can be kept alive at very low power
consumption of just 7uA. The RTC will track the current time and enable the module to start from
sleep states with very fast time to first Fix (TTFF).
3.14 UART interface
GNS3301 core and I/O sections work at 3.3V nominal. Absolute Maximum Ratings should not be
exceeded. Should the GNS3301 be interfaced to a host with I/O at higher/lower levels, level
shifters should be used. UART baud rate is 9600baud by default. The baud rate can be modified to
higher rates by a NMEA software command. See document NMEA_Interface_manual_MTK_V.. for
details.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
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GPS UART Default Settings
Parameter
Value
Baud rate
9600
Data length
8 bits
Stop bit
1
Parity
None
3.15 Module default settings
The GNS3301 module comes with default settings, which are persistently programmed. Whenever
power is removed from the module (both Vcc and VBACKUP), the settings will be reset to the values
shown in the following table.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
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13
Default settings
Setting
Default value
UART setting
9600,8,N,1
Fix frequency (update rate)
1/sec
NMEA sentences
$GPRMC,$GNGSA,$GPGSV,$GLGSV,$GPVTG,$GPGGA
NMEA rate
Once a second: RMC,GSA,VTG every 5 sec :GSV sentences
Self survey prediction mode:
EASYTM
enabled
Active interference
cancellation:MTAIC
enabled
DGPS option
SBAS enabled
Datum
WGS 84
PPS pulse output length
100ms
Logging parameters
cyclic / Content Basic / Interval 15 sec
On request, other options can be selected as preprogrammed (persistent default) options.
Please contact the GNS support for your project requirements.
Note : Customized options are solely available for fixed order lots.
4 TYPICAL APPLICATION BLOCK DIAGRAM
4.1 Typical System overview
Mobile device
Host Processor
MMI
(keys, display)
Power
Management
3.3V
GNS3301
GPS
Antenna
UART RX
UART TX
VCC
V Backup
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
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14
5 GNSS characteristics
5.1 GNSS characteristics
Parameter
Min
Typ
Max
Unit
Note
general
Frequency
1575.42
MHz
GPS L1
1598.0625~
1609.3125
MHz
GLONASS L1
SV Numbers
GPS #1~32
GLONASS #65~96
GALILEO #201~253*
DGPS
SBAS[QZSS,WAAS,EGNOS,
MSAS,GAGAN], RTCM
AGPS
Internal processing of predicted
orbit data. Service available via ftp.
6hrs prediction interval
Output data frequency
1/10
1
10
1/sec
Configurable
Navigation&tracking sensitivity
-165
-167
dBm
Acquisition sensitivity
-148
dBm
autonomous
TTFF hotstart
<1
sec
All SVs @-130dBm
TTFF autonomous cold start
34
sec
All SVs @-130dBm
Number of channels tracking
33
Number of acquisition channels
99
Dimension
10x9.3x2.0
mm3
Tolerance is 0.2 mm
Weight
0.41
g
Power consumption
GPS/GLONASS ACTIVE
(acquisition)
28
mA
NMEA frequency = 1/sec*,SBAS
enabled, MTAIC enabled
GPS/GLONASS ACTIVE
(tracking)
20
mA
NMEA frequency = 1/sec*, SBAS
enabled, MTAIC enabled
Backup current @ 3V
15
μA
*note: further power savings are possible using AlwaysLocate or periodical modes. Actual possible savings depend on use cases.
Accuracy
Position error CEP50
-
3
-
m
Without aid
Position error CEP50
-
2.5
-
m
Using (SBAS)
Velocity error
-
0.1
-
m/s
Without aid
velocity error
-
0.05
-
m/s
Using (SBAS)
ITAR limits
Operation altitude
-
18,000
m
Operation velocity
-
-
515
m/s
Operation acceleration
-
-
4
G
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
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15
6 DESIGN GUIDELINES
6.1 General
Although GNS3301 GPS&GLONASS module provides best performance at low power consumption,
special care should be taken to provide clean signal and clean power supplies. A multi layer carrier
board with solid power- and ground planes is recommended. Power lines should be blocked near to
the module with low ESR capacitors.
Radiated noise from neighbour components may also reduce the performance of the module.Special
care must be taken when designing the RF input tracks and antenna connection.
6.2 GPS and GLONASS antenna
GNS3301 contains all input circuitry needed to connect a passive antenna directly. A special GNS &
GLONASS antenna that covers both frequencies must be chosen.
If there is a long wire between GNS3301 RF input and antenna, there should be an LNA (on the
antenna side) to compensate for cable losses ("active" antenna).
More information about connecting and implementing a GNSS antenna to an application PCB,
please refer to GPS Antenna Design Guide.pdf.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
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7 ELECTRICAL SPECIFICATION
7.1 Absolute Maximum Ratings
Parameter
Value
Unit
Supply voltage range: Vcc
–0.5 to 4.3
V
Backup voltage: VBACKUP
–0.5 to 4.3
V
Input voltage to analog pins
–0.5 to 3.3
V
Input voltage to all other pins
–0.5 to Vcc
V
Operating ambient temperature range
–40 to +85
°C
Storage temperature range
–40 to +85
°C
7.2 Recommended Operating Conditions
Parameter
Min
Typ
Max
Unit
Note
Vcc
2.8
3.3
4.3
V
supply voltage
VBACKUP
2.8
3.3
4.3
V
Backup voltage for RTC and
memory retention, must be
available during normal
operation
High level output voltage VOH
0.8 * Vcc
Vcc
V
Low level output voltage VOL
0
0.2*VDD
V
High-level input voltage VIH
0.80* Vcc
Vcc
V
Low-level input voltage VIL
0
0.35* Vcc
V
Operating temperature
-40
85
°C
Full specified sensitivity
7.3 GPS/GLONASS input characteristics
Parameter
Min
Typ
Max
Unit
Note
Maximum input level
0
dBm
Input return loss
-6.5
dB
GPS & GLONASS module
GNS 3301
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8 DEVICE PINOUT DIAGRAM
8.1 Pin configuration
(TOP view)
GPS & GLONASS module
GNS 3301
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8.2 Pin assignment
Pin
Name
I/O
Description & Note
1
NC
Not conected
2
NC
Not conected
3
RESET
I
System reset pin
An external reset applied to this pin overrides all other internal controls. RESET# is an active low signal. Pulling
this pin low for at least 20 μs causes a system reset.
4
RF_GND
A
RF Ground
Ground connection of antenna should be connected at this pin.
5
RF_IN
A
RF input
connection forGNSS antenna. Supports passive antenna.
6
WAKEUP
I
Wakeup input
TBD
7
NC
Not conected
8
3D_FIX
O
3D-Fix Indicator
The 3D_FIX is assigned as a fix flag output. If not used, keep floating.
Before 2D Fix
The pin will continuously toggle with 0.5 Hz. output one second high-level and one-second low-level signal
After 2D or 3D Fix
The pin will continuously output low-level signal
This pin may not connected to high-level at power-on sequence.
9
RXA
I
Serial Data Input A for NMEA command input (TTL)
This is the UART-A receiver of the module. It is used to receive commands from system. UART A is also used for
firmware update
10
TXA
O
Serial Data Output A for NMEA output (TTL)
This is the UART-A transmitter of the module. It outputs GPS information for application. UART A is also used for
firmware update
11
RXB (RTCM in)
I
Serial Data Input B
This is the UART-B receiver of the module. It is used to receive RTCM data from system
12
NC
Not conected
13
1PPS
O
1PPS Time Mark Output
This pin provides one pulse-per-second output from the module and synchronizes to GPS time. Keep floating if
not used.
14
NC
Not conected
15
VBACKUP
P
Backup power input for RTC & navigation data keep
This connects to the backup power of the GPS module. Power source (such as battery) connected to this pin will
help the GPS chipset in keeping its internal RTC running when the main power source is turned off. The voltage
should be kept between 2.8V~4.3V, Typical 3.3V. current draw ~15µA
If VBACKUP power was not reserved, the GPS receiver will perform a lengthy cold start every time it is powered-on
because previous satellite information is not retained and needs to be re-transmitted.
This pin must be connected for normal operation.
16
VCC
P
Main DC power input
The main DC power supply for the module. The voltage should be kept between from 2.8V to 4.3V. The ripple
must be limited under 50mVpp (Typical: 3.3V).
E1
GND
P
Ground
E2
GND
P
Ground
(1) I = INPUT; O = OUTPUT; I/O = BIDIRECTIONAL; P = POWER PIN; ANA = ANALOG PIN.
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GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
19
9 NMEA DATA interface
GNS3301 provides NMEA 4.0 (National Marine Electronics Association) 0183 compatible data.
A set of proprietary NMEA commands are available to send control messages to the module.
These commands are described in a separate document: NMEA_Interface_manual_MTK_V.. .
For standard operation, no commands are needed; the module will start outputting NMEA sentences
after power supply has been attached. GNS3301 will always start communication output with 9600
bit per second.
If non standard options are needed (f.e. other baud rate , other NMEA sequence) they can be
programmed from host controller during runtime.
Important note : options set by using NMEA command interface are not persistent! They will be lost
when power is removed. A backup supply at VBACKUP will be sufficient to keep them.
9.1 NMEA output sentences for GPS and GLONASS
NMEA output sentences
Type
content
Common sentences
RMC
Recommended Minimum Navigation Information
GGA
Fix Data, Time, Position and fix related data for a GPS receiver
GLL
Geographic Position - Latitude/Longitude
GSA
GLONASS DOP and active satellites
VTG
Track made good and Ground speed
GSV
Satellites in view
NMEA output sentences indentifier, related to its GNSS system:
NMEA output identifier
System
GGA
GSA
GSV
RMC
VTG
GPS
GPGGA
GPGSA
GPGSV
GPRMC
GPVTG
GPS+GLONASS
GPGGA
GNGSA
GPGSV
GLGSV
GPRMC1 or
GNRMC
GPVTG
Note1: Before 3D fix RMC output is GPRMC, after 3D fix it changes to GNRMC.
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GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
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9.2 NMEA command interface
GNS3301 NMEA command interface allows to control settings and the extended functions. The
command interface specification is available in an extra document:
NMEA_Interface_manual_MTK_V.. .
Two groups of commands are available:
Setting commands do modify the behavior of the module.
Note : modified settings will be valid as long as the module is powered through Vcc or VBACKUP. (f.e.
: setting of a new baud rate). After removing Vcc and VBACKUP, all settings are reset to their default
values.
Action commands will perform the specified action one time after the command has been received.
(f.e. : request for cold start)
Commands are always started with $PTMK, directly followed by the command number 000..999.
Each command must be terminated by *<chksum>and a <CR><LF>.
The checksum calculation is simple, just XOR all the bytes between the $ and the * (not including
the delimiters themselves). Then use the hexadecimal ASCII format.
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
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10 PHYSICAL DIMENSIONS
TOP VIEW
all units in mm, tolerance is ±0.2mm
4.1
0.625
1.25
5.0
10
9.3
1.25=pad grid
3.725
4.65
2.1
1.2
16 pads 0.85*0.90
2 pads 2.25*2.25
1.25
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
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11 RECOMMENDED PAD LAYOUT
TOP VIEW
all units in mm
Note: For prototyping, GNS3301 is available on a stamp design adaptor board.
Recommended mainboard pad layout will fit for both.
0.625
1.25
10.0
1.25=pad grid
4.275
5.0
16 pads
0.95*1.55
2 pads
2.85*2.65
1.25
3.95
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
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12 MATERIAL INFORMATION
Complies to ROHS standard
ROHS documentations are available on request
Contact surface: gold over nickel
13 RECOMMENDED SOLDERING REFLOW PROFILE
Notes:
1. GNS3301 should be soldered in upright soldering position. In case of head-over soldering, please prevent
shielding / GNS3301 Module from falling down.
2. Do never exceed maximum peak temperature
3. Reflow cycles allowed : 1 time
4. Do not solder with Pb-Sn or other solder containing lead (Pb)
5. This device is not applicable for flow solder processing
6. This device is not applicable for solder iron process
100
200
300
t[sec]
100
200
T[°C]
250°C max
250°C for 10 sec max
230°C for 40 sec max
160°C 190°C 120 sec
reflow solder
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
24
14 PACKAGE INFORMATION
The GNS3301 are placed on a tray for quantities below 100 pieces. The trays will be stacked and
packed together.The trays are placed inside an antistatic bag.
15 TAPE&REEL INFORMATION
Tape information:
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
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16 REEL INFORMATION
:
Number of devices: 2000pcs/reel
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
26
17 ORDERING INFORMATION
Ordering information
Type
Part#
laser marking
Description
GNS3301
4037735105164
GNS3301
GPS&GLONASS
GNSS module
18 ENVIRONMENTAL INFORMATION
This product is free of environmental hazardous substances and complies with 2002/95/EC. (RoHS
directive).
Type
datecode
FW version
serial#
GNS 3301
14 04
3.20_32
128245
GPS & GLONASS module
GNS 3301
Datasheet
preliminary specification
© GNS-GmbH 2014
V 1.2, Nov 14th 2014
27
19 MOISTURE SENSITIVITY
This device must be prebaked before being put to reflow solder process.
Disregarding may cause destructive effects like chip cracking, which leaves the device defective !
Shelf life
6 months , sealed
Possible prebake recommendations
12 hrs @ 60°C
Floor life (time from prebake to solder process)
<72 hrs
20 DOCUMENT REVISION HISTORY
V0.0
March 17 2014
M.Reiff
initial preliminary
V0.1
May 22 2014
P.Skaliks
preliminary
V1.0
Sep 16 2014
P.Skaliks
Added logger information
V1.1
Oct 6 2014
P.Skaliks
added logger info, pad size
V1.2
Nov 14 2014
P.Skaliks
Corrected current consumption
21 RELATED DOCUMENTS
title
Description / file
Available from
GPS Antenna Connection Design
Guide
Design Guide to implement an GPS
antenna to an application PCB
www.forum.gns-gmbh.com
NMEA_Interface_manual_MTK_V..
Detailed description of NMEA protocol
www.forum.gns-gmbh.com
www.gns-gmbh.com
GNS3301 StarterKit user manual
User manual for the GNS3301 receiver
based evaluation kit
www.forum.gns-gmbh.com
www.gns-gmbh.com
GNS GMBH 2014
THE INFORMATION IN THIS DOCUMENTATION DOES NOT FORM ANY QUOTATION OR CONTRACT. TECHNICAL DATA ARE DUE TO BE CHANGED WITHOUT
NOTICE.
NO LIABILITY WILL BE ACCEPTED BY THE PUBLISHER FOR ANY CONSEQUENCE OF THIS DOCUMENT'S USE.
REPRODUCTION IN WHOLE OR IN PART IS PROHIBITED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COPYRIGHT OWNER
