Integration Manual
Table Of Contents
- Preface
- 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
- 1.10 DDC (I2C) interface
- 1.11 Audio Interface
- 1.12 General Purpose Input/Output (GPIO)
- 1.13 Reserved pins (RSVD)
- 1.14 Schematic for LISA-U series module integration
- 1.15 Approvals
- 2 Design-In
- 2.1 Design-in checklist
- 2.2 Design Guidelines for Layout
- 2.2.1 Layout guidelines per pin function
- 2.2.2 Footprint and paste mask
- 2.2.3 Placement
- 2.3 Thermal aspects
- 2.4 Antenna guidelines
- 2.5 ESD precautions
- 3 Features description
- 4 Handling and soldering
- 5 Product Testing
- Appendix
- A Migration to LISA-U2 series wireless modules
- B Glossary
- Related documents
- Revision history
- Contact
LISA-U series - System Integration Manual
3G.G2-HW-10002-A3 Preliminary System description
Page 46 of 160
1.9 Serial communication
LISA-U series modules provide the following serial communication interfaces where AT command interface and
Packet-Switched / Circuit-Switched Data communication are concurrently available:
One asynchronous serial interface (UART) that provides complete RS-232 functionality conforming to
ITU-T V.24 Recommendation [4], with limited data rate. The UART interface can be used for firmware
upgrade
One Inter Processor Communication (IPC) interface that includes a synchronous SPI-compatible interface,
with maximum data rate of 26 Mb/s
One high-speed USB 2.0 compliant interface, with maximum data rate of 480 Mb/s. The single USB interface
implements several logical devices. Each device is a USB communications device class (or USB CDC), that is a
composite Universal Serial Bus device class. The USB interface can be used for firmware upgrade
The LISA-U series modules are designed to operate as an HSPA wireless modem, which represents the data
circuit-terminating equipment (DCE) as described by the ITU-T V.24 Recommendation [4]. A customer application
processor connected to the module through one of the interfaces represents the data terminal equipment (DTE).
All the interfaces listed above are controlled and operated with:
AT commands according to 3GPP TS 27.007 [5]
AT commands according to 3GPP TS 27.005 [6]
AT commands according to 3GPP TS 27.010 [7]
u-blox AT commands
For the complete list of supported AT commands and their syntax refer to the u-blox AT Commands
Manual [3].
The following serial communication interfaces can be used for firmware upgrade:
The UART interface, using the RxD and TxD lines only
The USB interface, using all the lines provided (VUSB_DET, USB_D+ and USB_D-)
To directly enable PC (or similar) connection to the module for firmware upgrade, provide direct access
on the application board to the VUSB_DET, USB_D+ and USB_D- lines of the module (or to the RxD
and TxD lines). Also provide access to the PWR_ON or the RESET_N pins, or enable the DC supply
connected to the VCC pin to start the module firmware upgrade (see Firmware Update Application
Note [17]).
The following sub-chapters describe the serial interfaces configuration and provide a detailed description of each
interface for the application circuits.
1.9.1 Serial interfaces configuration
UART, USB and SPI/IPC serial interfaces are available as AT command interface and for Packet-Switched / Circuit-
Switched Data communication. The serial interfaces are configured as described in Table 22 (for information
about further settings, please refer to the u-blox AT Commands Manual [3]).