Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 GNSS Interface
- 2.4 Sample Application
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 4.1 Mechanical Dimensions of TX62-W
- 4.2 Mechanical Dimensions of TX82-W, TX82-W-B, TX62-W-B and TX62-W-C
- 4.3 Mounting TX62/TX82 onto the Application Platform
- 4.4 Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
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TX62-W/TX82-W Hardware Interface Description
2.3 GNSS Interface
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2.3 GNSS Interface
2.3.1 GNSS Receiver
TX62/TX82 integrates a GNSS receiver that offers the full performance of GPS/GLONASS/Bei-
Dou/Galileo technology. The GNSS receiver is able to continuously track all satellites in view,
thus providing accurate satellite position data.
The integrated GNSS receiver supports the NMEA protocol via ASC0 interface. NMEA is a
combined electrical and data specification for communication between various (marine) elec-
tronic devices including GNSS receivers. It has been defined and controlled by the US based
National Marine Electronics Association. For more information on the NMEA Standard please
refer to http://www.nmea.org.
Depending on the receiver’s knowledge of last position, current time and ephemeris data, the
receiver’s startup time (i.e., TTFF = Time-To-First-Fix) may vary: If the receiver has no knowl-
edge of its last position or time, a startup takes considerably longer than if the receiver still has
knowledge of its last position, time and almanac or has still access to valid ephemeris data and
the precise time. For more information see Section 2.3.3. Often, 2D measurements will be used
over 3D depending on space vehicle (SV) locations as this will be just as accurate and faster.
By default, the GNSS receiver is switched off. It has to be switched on and configured using
AT commands (AT^SGPSC; see [1]). Please note that concurrent GNSS and GSM/LTE oper-
ations are not supported (AT^SCFG= "MEopMode/RscMgmt/Rrc"; see [1]).
2.3.2 GNSS Antenna
In addition to the RF antenna interface TX62/TX82 also has a GNSS antenna interface. See
Section 2.1.1 to find out where the GNSS antenna pad is located. The GNSS installation is the
same as for the RF antenna interface - see Section 2.2.2.
It is possible to connect active or passive GNSS antennas. In either case the antennas must
have 50
Ω impedance. Please note that if an active GNSS antenna is selected, the voltage for
it has to be supplied by the external application, and a capacitor must be added to avoid voltage
back-feeding (see Figure 33). If a passive GNSS antenna is selected, this capacitor is optional.
Figure 33: Sample supply voltage circuit for active GNSS antenna
Active GNSS
Antenna
DC
GNSS
Receiver
Antenna
Matching
RF
DC
Active GNSS antenna power supply
(Voltage depends on antenna type)
GNSS_ANT
Module
Application
LNA
47p
10n