SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification System description
Page 42 of 218
In this way the different current consumption figures can be reached with the EXT32K input fed by the
32K_OUT output or by a proper external 32 kHz signal (for more details refer to section 1.5.1.3 and to
“Current consumption” section in
SARA-G3 series
Data Sheet
[1]).
SARA-G300 / SARA-G310 modules can provide the RTC functions (as RTC timing by AT+CCLK
command and RTC alarm by AT+CALA command) only if a proper 32 kHz signal is provided at the
EXT32K input pin. The RTC functions will be available only when the module is switched on if the
EXT32K input is fed by the 32K_OUT output, or they will be available also when the module is not
powered or switched off if the EXT32K input is fed by a proper external 32 kHz signal.
SARA-G3 series
Data Sheet
[1] describes the detailed electrical characteristics of the EXT32K input pin.
The 32 kHz reference clock for the RTC timing is automatically generated by the internal oscillator
provided on the SARA-G350 modules: the same pin (31) is a reserved (RSVD) pin internally not
connected, since an external 32 kHz signal is not needed to enter the low power idle-mode and to
provide the RTC functions.
1.6.5 Internal 32 kHz signal output (32K_OUT)
The 32K_OUT pin of SARA-G300 / SARA-G310 modules is an output pin that provides a 32 kHz
reference signal generated by the module, suitable only to feed the EXT32K input pin of SARA-G300 /
SARA-G310 modules, to make available the reference clock for the Real Time Clock (RTC) timing, so
that the modules can enter the low power idle-mode and can provide the RTC functions with modules
switched on.
The 32K_OUT pin does not provide the 32 kHz output signal when the SARA-G300 / SARA-G310
modules are in power down mode: the EXT32K input pin must be fed by an external proper 32 kHz
signal to make available the RTC functions when the modules are not powered or switched off.
SARA-G350 modules do not provide the 32K_OUT output, as there is no EXT32K input to feed on the
modules: the pin 24 constitute the GPIO3 on these modules.
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