LISA-U2 series - System integration manual
UBX-13001118 - R27
System description
Page 53 of 183
C1-Public
1.9
Serial communication
LISA-U2 modules provide the following serial communication interfaces where the 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 the ITU-T V.24 Recommendation
, with a limited data rate
•
One Inter Processor Communication (IPC) interface that includes a synchronous SPI-compatible
interface, with a maximum data rate of 26 Mbit/s
•
One high-speed USB 2.0 compliant interface, with a maximum data rate of 480 Mbit/s.
The LISA-U2 modules are designed to operate as an HSPA cellular modem, which represents a data
circuit-terminating equipment (DCE) as described by the ITU-T V.24 Recommendation
. 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
•
AT commands according to 3GPP TS 27.005
•
AT commands according to 3GPP TS 27.010
•
u-blox AT commands
☞
For the complete list of supported AT commands and their syntax, see the u-blox AT commands
manual
The module firmware can be upgraded over all the serial interfaces listed above by means of an AT
command (for more details, see section
as well as the u-blox AT commands manual
, +UFWUPD
command).
The module firmware can be upgraded over the following serial interfaces using the u-blox EasyFlash
tool:
•
The UART interface (only the
RxD
and
TxD
lines are needed)
•
The USB interface (all the provided lines
VUSB_DET
,
USB_D+
and
USB_D-
are needed)
☞
To directly enable PC (or similar) connection to the module for firmware upgrade using the u-blox
EasyFlash tool, 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 the Firmware update application note
The following sub-sections describe the serial interfaces configuration and provide a detailed
description of each interface for the application circuits.