SARA-G450 - System integration manual
UBX-18046432 - R08
System description
Page 13 of 143
C1-Public
1.4
Operating modes
SARA-G450 modules have several operating modes. The operating modes defined in
described in detail in
provide general guidelines for operation.
describes the transition between the different operating modes.
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 Idle mode
Module processor core runs with internal 32 kHz reference;
lowest current consumption.
Active mode
Module processor core runs with internal 26 MHz reference.
Connected mode
Module processor core runs with internal 26 MHz reference; voice call, data
transmission/reception or signaling activity with the network enabled.
Table 4: Module operating modes definition
Mode
Description
Transition between operating modes
Not-Powered VCC supply not present or below operating
range.
Module is switched off.
Application interfaces are not accessible.
Internal RTC operates if a valid voltage is
applied to V_BCKP.
When VCC supply is removed, the module enters not-powered
mode.
When in not-powered mode, the module cannot be switched on
by PWR_ON or RTC alarm.
When in not-powered mode, the module switches to power-off
mode if valid VCC supply is applied (see section
).
Power-Off
VCC supply within operating range.
Module is switched off.
Application interfaces are not accessible.
Internal RTC operates as V_BCKP is
internally generated.
When valid VCC supply is applied, the module switches from
not-powered mode to power-off mode (see section
).
When the module is switched off by an appropriate power-off
event or by a PWR_OFF abrupt shutdown, the module enters
power-off mode (see section
).
When in power-off mode, the module can be switched on by
PWR_ON or RTC alarm: the module switches from power-off
mode to active mode (see section
).
When valid VCC supply is removed, the module switches from
power-off mode to not-powered mode.
Idle
The module is not ready to communicate
with an external device by means of the
application interfaces as configured to
reduce consumption.
The module automatically enters idle
mode whenever possible if power saving is
enabled by the +UPSV AT command (see
the u-blox AT commands manual
),
reducing power consumption (see
section
).
The CTS output line indicates when the
UART interface is disabled/enabled due to
the module idle/active mode according to
power saving and HW flow control settings
(see
Power saving configuration is not enabled
by default: it can be enabled by +UPSV
(see u-blox AT commands manual
The module automatically switches from active mode to idle
mode whenever possible if power saving is enabled (see
sections
and the u-blox AT commands
manual
, +UPSV AT command).
The module wakes up from idle to active mode in the following
events:
Automatic periodic monitoring of the paging channel for the
paging block reception according to network conditions
(see
Data received on the UART interface, according to HW flow
control (AT&K) and power saving (AT+UPSV) settings
(see
RTS input line set to the ON state by the DTE, if HW flow
control is disabled by AT&K0 and AT+UPSV=2 is set
(see
