User's Manual

TOBY-R2 series - Data Sheet
UBX-16005785 - R06 Interfaces
Page 11 of 41
2.3 System functions
2.3.1 Module power-on
TOBY-R2 series can be switched on in one of the following ways:
 Rising edge on the VCC pins to a valid voltage for module supply, i.e. applying module supply: the modules
switch on if the VCC supply is applied, starting from a voltage value of less than 2.1 V, with a rise time from
2.3 V to 2.8 V of less than 4 ms, reaching a proper nominal voltage value within VCC operating range.
Alternately, in case for example the fast rise time on VCC rising edge cannot be guaranteed by the application,
TOBY-R2 series modules can be switched on from not-powered mode as following:
 RESET_N input pin is held low by the external application during the VCC rising edge, so that the modules
will switch on when the external application releases the RESET_N input pin from the low logic level after
the VCC supply voltage stabilizes at its proper nominal value within the operating range
 PWR_ON input pin is held low by the external application during the VCC rising edge, so that the modules
will switch on when the external application releases the PWR_ON input pin from the low logic level after
the VCC supply voltage stabilizes at its proper nominal value within the operating range
When the TOBY-R2 series modules are in the power-off mode (i.e. properly switched off as described in section
2.3.2, with valid VCC module supply applied), they can be switched on as follows:
 Low pulse on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time period (see
section 4.2.8). The PWR_ON line should be driven by open drain, open collector or contact switch.
 Rising edge on the RESET_N pin, i.e. releasing the pin from the low level, normally set high by an internal
pull-up. The RESET_N line should be driven by open drain, open collector or contact switch.
 RTC alarm, i.e. pre-programmed scheduled time by AT+CALA command.
2.3.2 Module power-off
TOBY-R2 series can be properly switched off, saving current parameter settings in the module’s non-volatile
memory and performing a proper network detach, by:
 AT+CPWROFF command (see the u-blox AT Commands Manual [1]).
 Low pulse on the PWR_ON pin, which is normally set high by an internal pull-up, for a valid time period (see
section 4.2.8). The PWR_ON line should be driven by open drain, open collector or contact switch.
An abrupt under-voltage shutdown occurs on TOBY-R2 series modules when the VCC supply is removed. If this
occurs, it is not possible to store the current parameter settings in the module’s non-volatile memory and to
perform the proper network detach.
An abrupt shutdown occurs on TOBY-R2 series modules when a low level is applied on the RESET_N pin, which
is normally set high by an internal pull-up. If this occurs, it is not possible to store the current parameter settings
in the module’s non-volatile memory and to perform the proper network detach.
An over-temperature or an under-temperature shutdown occurs on TOBY-R2 modules when the temperature
measured within the cellular module reaches the dangerous area, if the optional Smart Temperature Supervisor
feature is enabled and configured by the dedicated AT command. For more details see the TOBY-R2 series
System Integration Manual [2] and the u-blox AT Commands Manual [1], +USTS AT command.