LEXI-R422 - System integration manual
UBX-23007449 - R02
System description
Page 12 of 108
C1-Public
1.4
Operating modes
LEXI-R422 modules have several operating modes. The operating modes are defined in
described in detail in
, providing general guidelines for operation.
General status
Operating mode
Definition
Power-down
Not-powered mode VCC
supply not present or below operating range: module is switched off.
Power-off mode
VCC
supply within operating range and module is switched off.
Normal Operation Deep-sleep mode
Only the RTC runs. The processor and other parts of the module are switched off.
Idle mode
Module processor runs at the minimum frequency to save power consumption.
Active mode
Module processor runs at normal operating frequency to enable related functions.
Connected mode
RF Tx/Rx enabled with processor running at related operating frequency.
Table 4: LEXI-R422 modules operating modes definition
Mode
Description
Transition between operating modes
Not-powered
Module is switched off.
Application interfaces are not accessible.
When VCC supply is removed, the modules enter not-powered
mode.
When in not-powered mode, the module can enter power-off
mode applying VCC supply (see
Power-off
Module is switched off: normal shutdown by
an appropriate power-off event (see
Application interfaces are not accessible.
The modules enter power-off mode from active mode when the
host processor implements a clean switch-off procedure, by
sending the +CPWROFF AT command or by using the
PWR_CTRL pin (see
When in power-off mode, the modules can be switched on by the
host processor using the PWR_CTRL input pin (see
When in power-off mode, the modules enter not-powered mode
by removing VCC supply.
Deep-sleep
Module is in RTC-only mode: only the
internal Real Time Clock is active.
The RF section and the application
interfaces are temporarily disabled and
switched off: the module is temporarily not
ready to communicate with an external
device by means of the application
interfaces as configured to reduce the
current consumption to the minimum
possible (see section
).
The modules automatically switch from the active mode to the
ultra-low power deep-sleep mode whenever possible,
upon expiration of the T3324 active timer set by the network
(entering the Power Saving Mode defined in 3GPP Rel.13,
depending on the configuration set by +CPSMS AT command),
upon expiration of the 6 s AT inactivity timer (depending on the
configuration set by the +UPSV AT command),
in-between eDRX cycles when not listening to paging (depending
on the configuration set by the +UPSMVER AT command),
if no other concurrent activities are executed.
When the module is in the ultra-low power deep-sleep mode,
it automatically switches on to the active mode upon expiration
of the T3412 periodic TAU timer set by the network according to
the Power Saving Mode defined in 3GPP Rel.13,
it automatically switches on in-between eDRX cycles when
listening to paging according to the timing set by the network,
or it can be switched on to the active mode by the host
processor using the PWR_CTRL input pin (see
For further details, see the application development guide
and the AT commands manual
