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 89 of 182
Connection with u-blox 1.8 V GNSS receivers
Figure 47 shows an application circuit for connecting a LISA-U2 cellular module to a u-blox 1.8 V GNSS
receiver.
The SDA and SCL pins of the LISA-U2 cellular module are directly connected to the corresponding
I
2
C pins of the u-blox 1.8 V GNSS receiver, with appropriate pull-up resistors connected to the 1.8
V GNSS supply enabled after the V_INT supply of the I
2
C pins of the LISA-U2 cellular module.
GPIO3 and GPIO4 pins are directly connected respectively to the TxD1 and EXTINT0 pins of the u-
blox 1.8 V GNSS receiver to provide “GNSS data ready” and “GNSS RTC sharing” functions.
A pull-down resistor is mounted on the GPIO4 line for correct “GNSS RTC sharing” function
implementation.
A pull-down resistor is mounted on the GPIO2 line to avoid a switch-on of the u-blox GNSS receiver
when the LISA-U2 module is in the internal reset state.
The V_BCKP supply output of the LISA-U2 cellular module is connected to the V_BCKP backup
supply input pin of the GNSS receiver to provide the supply for the GNSS real time clock and
backup RAM when the VCC supply of the cellular module is within its operating range and the VCC
supply of the GNSS receiver is disabled. This enables the u-blox GNSS receiver to recover from a
power breakdown with either a hot start or a warm start (depending on the duration of the GNSS
VCC outage) and to maintain the configuration settings saved in the backup RAM.
☞ “GNSS data ready” and “GNSS RTC sharing” functions are not supported by all u-blox GNSS
receivers HW or ROM/FW versions. See the GNSS Implementation Application Note [15] or the
Hardware Integration Manual of the u-blox GNSS receivers for the supported features.
LISA-U2 series
R1
INOUT
GND
GPS LDO
Regulator
SHDN
u-blox GNSS
1.8 V receiver
SDA2
SCL2
R2
1V8 1V8
VMAIN1V8
U1
21
GPIO2
SDA
SCL
C1
TxD1
EXTINT0
GPIO3
GPIO4
46
45
23
24
VCC
R3
V_BCKP V_BCKP
2
R4
Figure 47: DDC Application circuit for u-blox 1.8 V GNSS receiver
Reference
Description
Part Number - Manufacturer
R1, R2, R4
4.7 kΩ Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
R3
47 kΩ Resistor 0402 5% 0.1 W
RC0402JR-0747KL - Yageo Phycomp
U1
Voltage Regulator for GNSS receiver
See GNSS receiver Hardware Integration Manual
Table 38: Components for DDC application circuit for u-blox 1.8 V GNSS receiver