TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 32 of 158
1.6.2
Module power-off
TOBY-L2 series can be properly switched off by:
AT+CPWROFF command (see
u-blox AT Commands Manual
[3]). The current parameter settings are saved in
the module’s non-volatile memory and a proper network detach is performed.
The MPCI-L2 series modules do not switch off by the AT+CPWROFF command as the TOBY-L2 modules,
but the AT+CPWROFF command causes a reset (reboot) of the module due to the MPCI-L2 module’s
internal configuration: the command stores the actual parameter settings in the non-volatile memory of
MPCI-L2 modules and performs a network detach, with a subsequent reset (reboot) of the module.
An abrupt under-voltage shutdown occurs on TOBY-L2 and MPCI-L2 series modules when the
VCC
or
3.3Vaux
module supply is removed. If this occurs, it is not possible to perform the storing of the current parameter
settings in the module’s non-volatile memory or to perform the proper network detach.
It is highly recommended to avoid an abrupt removal of the
VCC
supply during TOBY-L2 modules normal
operations: the power off procedure must be started by the AT+CPWROFF command, waiting the
command response for a proper time period (see
u-blox AT Commands Manual
[3]), and then a proper
VCC
supply has to be held at least until the end of the modules’ internal power off sequence, which
occurs when the generic digital interfaces supply output (
V_INT
) is switched off by the module.
It is highly recommended to avoid an abrupt removal of the
3.3Vaux
supply during MPCI-L2 modules
normal operations: the power off procedure must be started by setting the MPCI-L2 module in the halt
mode by the AT+CFUN=127 command (which stores the actual parameter settings in the non-volatile
memory of the module and performs a network detach), waiting the command response for a proper
time period (see the
u-blox AT Commands Manual
[3]), and then the
3.3Vaux
supply can be removed.
An abrupt hardware shutdown occurs on TOBY-L2 series modules when a low level is applied on the
RESET_N
pin for a specific time period. In this case, the current parameter settings are not saved in the module’s
non-volatile memory and a proper network detach is not performed.
It is highly recommended to avoid an abrupt hardware shutdown of the module by forcing a low level on
the
RESET_N
input pin during module normal operation: the
RESET_N
line should be set low only if reset
or shutdown via AT commands fails or if the module does not reply to a specific AT command after a time
period longer than the one defined in the
u-blox AT Commands Manual
An over-temperature or an under-temperature shutdown occurs on TOBY-L2 and MPCI-L2 series 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
u-blox AT Commands Manual
[3], +USTS AT command.
The Smart Temperature Supervisor feature is not supported by the “00”, “01”, and “50” product
versions.
