User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 14 of 116
1.4 Operating modes
LISA-U1/LISA-H1 series modules include several operating modes, each have different active features and
interfaces. Table 2 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
falling edge provided on the PWR_ON
input, or by a preset RTC alarm or by a
rising edge provided on the RESET_N
input.
Power-Off Mode
VCC supply within operating
range.
Microprocessor switched off
(not operating).
Only RTC runs.
Module is switched off: normal
shutdown after sending the
AT+CPWROFF command (refer to
u-blox AT Commands Manual [2]).
Application interfaces are not
accessible.
Only the internal RTC timer in
operation.
Module can be switched on by a falling
edge on the PWR_ON input, or 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 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 [2], AT+UPSV).
If the module is registered with the
network and power saving is enabled, it
automatically enters idle mode and
periodically wakes up to active mode to
monitor the paging channel for the
paging block reception according to
network indication.
If module is not registered with the
network and power saving is enabled, it
automatically enters idle mode and
periodically wakes up to monitor external
activity.
Module wakes up from idle mode to
active mode if a voice or data call
incoming.
Module wakes up from idle mode to
active mode if an RTC alarm occurs.
Module wakes up from idle mode to
active mode when data is received on
UART interface (refer to 1.9.2).
Module wakes up from idle mode to
active mode when the RTS input line is
set to the ON state by the DTE if the
AT+UPSV=2 command is sent to the
module (refer to 1.9.2).
Module wakes up from idle mode to
active mode at USB detection, applying
5 V (typ.) to the VUSB_DET pin.
Module wakes up from idle mode to
active mode when the connected USB
host forces a remote wakeup of the
module as USB device (refer to 1.9.3).
Module wakes up from idle mode to
active mode when the connected SPI
master indicates to the module that it is
ready to transmit or receive, by the IPC
SPI_MRDY signal (refer to 1.9.4).