Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 Inter-Integrated Circuit Interface
- 2.1.7 UICC/SIM/USIM Interface
- 2.1.8 Enhanced ESD Protection for SIM Interfaces
- 2.1.9 Digital Audio Interface
- 2.1.10 Analog-to-Digital Converter (ADC)
- 2.1.11 RTC Backup
- 2.1.12 GPIO Interface
- 2.1.13 Control Signals
- 2.1.14 JTAG Interface
- 2.1.15 eMMC Interface
- 2.2 GSM/UMTS/LTE Antenna Interface
- 2.3 GNSS Antenna Interface
- 2.4 Sample Application
- 2.1 Application Interface
- 3 GNSS Interface
- 4 Operating Characteristics
- 5 Mechanical Dimensions and Mounting
- 6 Regulatory and Type Approval Information
- 7 Document Information
- 8 Appendix
Cinterion
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ALAS5V Hardware Interface Description
3 GNSS Interface
67
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 65 of 124
3 GNSS Interface
ALAS5V integrates a GNSS receiver that offers the full performance of GPS/GLONASS tech-
nology. The GNSS receiver is able to continuously track all satellites in view, thus providing ac-
curate satellite position data.
The integrated GNSS receiver supports the NMEA protocol via USB or ASC0 interface. NMEA
is a combined electrical and data specification for communication between various (marine)
electronic 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 has still
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 3.1.
By default, the GNSS receiver is switched off. It has to be switched on and configured.
Dead Reckoning Sync Line:
Dead reckoning solutions are used in (automotive) platforms to determine the (vehicles) loca-
tion even when there is no GPS signal available (e.g. in tunnels, basement garages or even
between high buildings in cities).
In addition to dead reckoning related NMEA sentences (for details see [1]: GNSS sentences),
ALAS5V provides a dead reckoning synchronization line (DR_SYNC line) to be employed in
external dead reckoning applications. DR_SYNC is derived from the GNSS signal clock as 1
pulse per second (1PPS) signal, with a frequency of 1Hz, an accuracy of +/-5 ms, and a high
state pulse of 1ms. The DR_SYNC signal is provided as long as synchronized with the GNSS
satellite clock, and continues after GNSS signal loss. DR_SYNC can be configured for the
GPIO1 pad. For electrical characteristics see Table 22.