TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 32 of 164
1.6.2
Module power-off
TOBY-L2 series can be properly switched off by:
AT+CPWROFF command (see u-blox AT Commands Manual
). 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
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
), 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
, +USTS AT command.
☞
The Smart Temperature Supervisor feature is not supported by the “00”, “01”, “60” product
versions.
