Integration Manual
Table Of Contents
- Document Information
- Contents
- 1 System description
- 1.1 Overview
- 1.2 Architecture
- 1.3 Pin-out
- 1.4 Operating modes
- 1.5 Power management
- 1.6 System functions
- 1.7 RF connection
- 1.8 (U)SIM interface
- 1.9 Serial communication
- 1.9.1 Serial interfaces configuration
- 1.9.2 Asynchronous serial interface (UART)
- 1.9.2.1 UART features
- 1.9.2.2 UART signal behavior
- 1.9.2.3 UART and power-saving
- 1.9.2.4 UART application circuits
- Providing the full RS-232 functionality (using the complete V.24 link)
- Providing the TxD, RxD, RTS, CTS and DTR lines only (not using the complete V.24 link)
- Providing the TxD, RxD, RTS and CTS lines only (not using the complete V.24 link)
- Providing the TxD and RxD lines only (not using the complete V24 link)
- Additional considerations
- 1.9.3 USB interface
- 1.9.4 SPI interface
- 1.9.5 MUX protocol (3GPP TS 27.010)
- 1.10 DDC (I2C) interface
- 1.11 Audio Interface
- 1.12 General Purpose Input/Output (GPIO)
- 1.13 Reserved pins (RSVD)
- 1.14 Schematic for LISA-U2 module integration
- 1.15 Approvals
- 1.15.1 European Conformance CE mark
- 1.15.2 US Federal Communications Commission notice
- 1.15.3 Innovation, Science, Economic Development Canada notice
- 1.15.4 Australian Regulatory Compliance Mark
- 1.15.5 ICASA Certification
- 1.15.6 KCC Certification
- 1.15.7 ANATEL Certification
- 1.15.8 CCC Certification
- 1.15.9 Giteki Certification
- 2 Design-In
- 3 Features description
- 3.1 Network indication
- 3.2 Antenna detection
- 3.3 Jamming Detection
- 3.4 TCP/IP and UDP/IP
- 3.5 FTP
- 3.6 HTTP
- 3.7 SSL/TLS
- 3.8 Dual stack IPv4/IPv6
- 3.9 AssistNow clients and GNSS integration
- 3.10 Hybrid positioning and CellLocate®
- 3.11 Control Plane Aiding / Location Services (LCS)
- 3.12 Firmware update Over AT (FOAT)
- 3.13 Firmware update Over the Air (FOTA)
- 3.14 In-Band modem (eCall / ERA-GLONASS)
- 3.15 SIM Access Profile (SAP)
- 3.16 Smart Temperature Management
- 3.17 Bearer Independent Protocol
- 3.18 Multi-Level Precedence and Pre-emption Service
- 3.19 Network Friendly Mode
- 3.20 Power saving
- 4 Handling and soldering
- 5 Product Testing
- Appendix
- A Migration from LISA-U1 to LISA-U2 series
- A.1 Checklist for migration
- A.2 Software migration
- A.2.1 Software migration from LISA-U1 series to LISA-U2 series modules
- A.3 Hardware migration
- A.3.1 Hardware migration from LISA-U1 series to LISA-U2 series modules
- A.3.2 Pin-out comparison LISA-U1 series vs. LISA-U2 series
- A.3.3 Layout comparison LISA-U1 series vs. LISA-U2 series
- B Glossary
- Related documents
- Revision history
- Contact
LISA-U2 series - System Integration Manual
UBX-13001118 - R25 System description Page 45 of 182
1.7 RF connection
The ANT pin, provided by all LISA-U2 modules, represents the main RF input/output used to transmit
and receive the 2G and 3G RF signal: the main antenna must be connected to this pad. The ANT pin
has a nominal characteristic impedance of 50 and must be connected to the antenna through a 50
transmission line to allow transmission and reception of radio frequency (RF) signals in the 2G and
3G operating bands.
The ANT_DIV pin, provided by LISA-U230 modules, represents the RF input for the integrated
diversity receiver implemented for both 2G and 3G cases: the antenna for the Rx diversity must be
connected to this pad. The ANT_DIV pin has a nominal characteristic impedance of 50 and must be
connected to the antenna for the Rx diversity through a 50 transmission line to allow reception of
radio frequency (RF) signals, improving the cellular link quality and reliability on all 2G and 3G
operating bands except the 2G DCS 1800.
Name
Module
Description
Remarks
ANT
All
RF input/output for main Tx/Rx
antenna
Zo = 50 nominal characteristic impedance.
ANT_DIV
LISA-U230
RF input for Rx diversity antenna
Zo = 50 nominal characteristic impedance.
Table 20: Antenna pins
☞ The ESD immunity rating of the ANT port is 1000 V (according to IEC 61000-4-2). Higher protection
level could be required if the line is externally accessible on the application board (for further
details, see section 2.5.3).
Choose an antenna with optimal radiating characteristics for the best electrical performance and
overall module functionality. An internal antenna, integrated on the application board, or an external
antenna, connected to the application board through a suitable 50 connector, can be used. See
section 2.4 and section 2.2.1.1 for further details regarding antenna guidelines.
⚠ The recommendations of the antenna producer for correct installation and deployment (PCB
layout and matching circuitry) must be followed.
If an external antenna is used, the PCB-to-RF-cable transition must be implemented using either a
suitable 50 connector, or an RF-signal solder pad (including GND) that is optimized for 50
characteristic impedance.
If antenna supervisor functionality is required, the main antenna connected to the ANT pin should
have a built-in DC diagnostic resistor to ground to achieve reliable detection functionality (see section
2.4.4).
☞ Connect the Rx diversity antenna to the ANT_DIV pin of LISA-U230 modules, unless the 2G and
3G Rx diversity feature is disabled by the AT command (see the u-blox AT Commands Manual [2],
+URXDIV command). The same pin (74) is marked RSVD (reserved) on the other modules that do
not implement Rx diversity: in this case the RSVD pin can be left unconnected.