SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 18 of 128
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1.4 Operating modes
SARA-R4 series modules have several operating modes. The operating modes are defined in Table 4
and described in detail in Table 5, providing general guidelines for operation.
VCC supply not present or below operating range: module is switched off.
VCC supply within operating range and module is switched off.
Only the RTC runs, with 32 kHz reference internally generated.
Module processor runs with 32 kHz reference generated by the internal oscillator.
Module processor runs with 19.2 MHz reference generated by the internal oscillator.
RF Tx/Rx data connection enabled and processor core runs with 19.2 MHz reference.
Table 4: SARA-R4 series modules operating modes definition
Transition between operating modes
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 1.6.1).
Module is switched off: normal shutdown by
an appropriate power-off event (see 1.6.2).
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_ON /
PWR_CTRL pin (see 1.6.2).
When in power-off mode, the modules can be switched on by the
host processor using the PWR_ON / PWR_CTRL input pin (see
1.6.1).
When in power-off mode, the modules enter not-powered mode
by removing VCC supply.
Module is in RTC-only mode: only the
internal 32 kHz 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 1.5.1.4).
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 concurrent GNSS activities are executed (considering the
SARA-R422M8S and SARA-R422S modules).
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_ON / PWR_CTRL input pin (see 1.6.1).
For further details, see u-blox application development guide [4]
and the u-blox AT commands manual [2].
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