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 17 of 160
1.4 Operating modes
LISA-U series modules have several operating modes. Table 5 summarizes the various operating modes and
provides general guidelines for operation.
Operating Mode
Description
Features / Remarks
Transition condition
General Status: Power-down
Not-Powered
Mode
VCC supply not present or
below operating range.
Microprocessor switched off
(not operating).
RTC only operates if supplied
through V_BCKP pin.
Module is switched off.
Application interfaces are not accessible.
Internal RTC timer operates only if a valid
voltage is applied to V_BCKP pin.
Module cannot be switched on by a low
level on the PWR_ON input, by a rising
edge on the RESET_N input, or by a
preset RTC alarm.
Module can be switched on applying
VCC supply.
Power-Off Mode
VCC supply within operating
range.
Microprocessor switched off
(not operating).
Only RTC runs.
Module is switched off: normal shutdown
by AT+CPWROFF command (refer to
u-blox AT Commands Manual [3]), or by
PWR_ON held low for more than 1 s
(LISA-U2xx-01 only).
Application interfaces are not accessible.
Only the internal RTC timer in operation.
Module can be switched on by a low
level on the PWR_ON input, by a rising
edge on the RESET_N input, or by a
preset RTC alarm.
General Status: Normal Operation
Idle-Mode
Microprocessor runs with
32 kHz as reference oscillator.
Module does not accept data
signals from an external
device.
If power saving is enabled, the module
automatically enters idle-mode whenever
possible.
Application interfaces are disabled.
If hardware flow control is enabled, the
CTS line to ON state indicates that the
module is in active mode and the UART
interface is enabled: the line is driven in
the OFF state when the module is not
prepared to accept data by the UART
interface.
If hardware flow control is disabled, the
CTS line is fixed to ON state.
Module by default is not set to
automatically enter idle-mode whenever
possible, unless power saving
configuration is enabled by appropriate
AT command (refer to u-blox AT
Commands Manual [3], AT+UPSV).
Module enters automatically idle-mode
when power saving is enabled and
there is no activity for the defined time
interval:
Module registered with the
network and power saving
enabled. Periodically wakes up to
active mode to monitor the paging
channel for the paging block
reception according to network
indication
Module not registered with the
network and power saving is
enabled. Periodically wakes up to
monitor external activity
Module wakes up from idle-mode to
active-mode in the following events:
Incoming voice or data call
RTC alarm occurs
Data received on UART interface
(refer to 1.9.2)
RTS input line set to the ON state
by the DTE if the AT+UPSV=2
command is sent to the module
(refer to 1.9.2)
USB detection, applying 5 V (typ.)
to the VUSB_DET pin
The connected USB host forces a
remote wakeup of the module as
USB device (refer to 1.9.3)
The connected SPI master indicates
to the module that it is ready for
transmission or reception, by the
SPI/IPC SPI_MRDY input signal
(refer to 1.9.4)