SARA-G3 series - System Integration Manual
UBX-13000995 - R06
Objective Specification
System description
Page 24 of 218
1.4
Operating modes
SARA-G3 modules have several operating modes. The operating modes defined in
provide 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
Idle-Mode
Module processor core runs with 32 kHz reference, that is generated by:
The internal 32 kHz oscillator (SARA-G350)
The 32 kHz signal provided at the
EXT32K
pin (SARA-G300 and SARA-
G310)
Active-Mode
Module processor core runs with 26 MHz reference generated by the internal
oscillator.
Connected-Mode
Voice or data call enabled and processor core runs with 26 MHz reference.
Table 4: Module operating modes definition
Operating Mode
Description
Transition between operating modes
Not-Powered Mode
Module is switched off.
Application interfaces are not accessible.
Internal RTC timer operates on SARA-G350
modules only if a valid voltage is applied to
V_BCKP
pin. Additionally, a proper external 32 kHz
signal must be fed to
EXT32K
pin on SARA-G300
/ SARA-G310 to let RTC timer running that
otherwise is not in operation.
When
VCC
supply is removed, the module enters
not-powered mode.
When in not-powered mode, the module cannot be
switched on by a low level on
PWR_ON
input or by
a preset RTC alarm.
When in not-powered mode, the module can be
switched on applying
VCC
supply (refer to 2.2.1) so
that the module switches from not-powered to active-
mode.
Power-Off Mode
Module is switched off: normal shutdown by an
appropriate power-off event (refer to 1.6.2).
Application interfaces are not accessible.
Internal RTC timer operates on SARA-G350
modules.
A proper external 32 kHz signal must be fed to the
EXT32K
pin on SARA-G300 / SARA-G310 to let
RTC timer running that otherwise is not in
operation.
When the module is switched off by an appropriate
power-off event (refer to 1.6.2), the module enters
power-off mode from active-mode.
When in power-off mode, the module can be
switched on by a low level on
PWR_ON
input or by
a preset RTC alarm (refer to 2.2.1): module
switches from power-off to active-mode.
When
VCC
supply is removed, the module switches
from power-off mode to not-powered mode.
