SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 17 of 157
1.4 Operating modes
SARA-R4/N4 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.
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/N4 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 AT+CPWROFF command or by using the PWR_ON pin (see
1.6.2).
When in power-off mode, the modules can be switched on by the
host processor using the PWR_ON input pin (see 1.6.1).
When in power-off mode, the modules enter not-powered mode by
removing VCC supply.
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