SARA-N2 / N3 series - System integration manual
UBX-17005143 - R13
System description
Page 13 of 95
C1-Public
1.4
Operating modes
SARA-N2 / N3 series modules have several operating modes as defined in
General Status
Operating Mode
Definition
Power-down
Not-Powered mode VCC
supply not present or below the operating range. The module is switched off.
Power-Off mode
8
VCC
supply within the operating range, with the module switched off.
Normal operation Deep-sleep mode
Module processor runs with internal 32 kHz reference.
Lowest possible power mode, with current consumption in the ~
µ
A range.
Sleep mode
Module processor runs with internal 32 kHz reference.
PSRAM does not power down, with current consumption in the ~100
µ
A range.
Idle mode
Module processor runs with internal 32 kHz reference.
Low power mode, with current consumption in the ~mA range.
Active mode
Module processor runs with internal 38.4 MHz / 26 MHz reference.
Data transmission or reception not in progress.
Connected mode
Module processor runs with internal 38.4 MHz / 26 MHz reference.
Data transmission or reception in progress.
Table 4: SARA-N2 / N3 series
modules’
operating modes definition
illustrate the transition between the different operating modes.
The initial operating mode of SARA-N2 / N3 series modules is the one with
VCC
supply not present or
below the operating range: the modules are switched off in non-powered mode
.
Once a valid
VCC
supply is applied to the SARA-N2 modules, this event triggers the switch on routine
of the modules that subsequently enter the active mode.
On the other hand, once a valid
VCC
supply is applied to the SARA-N3 series modules, they remain
switched off in power-off mode. Then the proper toggling of the
PWR_ON
input line is necessary to
trigger the switch on routine of the modules that subsequently enter the active mode.
SARA-N2 / N3 series modules are fully ready to operate when in active mode.
Then, the SARA-N2 series modules switch from active mode to deep sleep mode whenever possible,
entering the lowest possible power mode, with current consumption in the ~
µ
A range. The UART
interface is still completely functional and the module can accept and respond to any AT command,
entering back into the active mode as in case of network paging reception and as in case of expiration
of the “Periodic Update Timer” according to the Power Saving Mode
defined in 3GPP release 13.
Instead, the SARA-N3 series modules switch from active mode to the idle mode whenever possible,
entering the low power mode, if enabled by a dedicated AT command, with current consumption in
the ~mA range. The UART interface is still completely functional and the module can accept and
respond to any AT command, entering back into the active mode as in case of network paging
reception.
According to AT+NVSETPM setting, the SARA-N3 series can switch between modes. It can switch
from active mode to sleep mode if the eDRX feature is enabled and set to let the module go to sleep
for time periods of less than 300 s. It can switch from active mode to deep sleep mode if the Power
Saving Mode is enabled or if the eDRX feature is enabled and set to let the module go to sleep for time
periods of more than 300 s, thus entering the lowest possible power mode, with current consumption
in the ~
µ
A range (Power Saving Mode and eDRX are defined in 3GPP release 13). In both sleep mode
and deep sleep mode, the UART interface is not functional: a wake up event, consisting for example
in proper toggling of the
PWR_ON
line
or in expiration of the “Periodic Update Timer”
, is necessary to
trigger the wake up routine of the modules that subsequently enter back into the active mode.
☞
See the SARA-N2 / SARA-N3 series AT commands manual
and for configuration of PSM and eDRX features.
8
Not available in SARA-N2 series modules
