TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04
Advance Information
System description
Page 25 of 90
1.6.2
Module power-off
TOBY-L1 modules can be properly switched off by:
•
AT+CPWROFF command (see
TOBY-L1 / MPCI-L1 series 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-L1 series modules do not switch off by the AT+CPWROFF command as the TOBY-L1 modules,
but the AT+CPWROFF command causes a reset (reboot) of the module due to the MPCI-L1 module’s
internal configuration: the AT+CPWROFF command performs the storage of the actual parameter settings
in the non-volatile memory of MPCI-L1 modules and it performs a network detach, with a subsequent
reset (reboot) of the module.
An abrupt under-voltage shutdown occurs on TOBY-L1 and MPCI-L1 series modules when the
VCC
or
3.3Vaux
module supply is removed. If this occurs, it is not possible to perform the storage 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-L1 modules normal
operations: the power off procedure must be started by the AT+CPWROFF command, waiting the
command response for a proper time period, and then a proper
VCC
supply has to be held at least until
the end of the 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-L1 modules
normal operations: the power off procedure must be started by setting the MPCI-L1 module to the
minimum functionality by the AT+CFUN=0 command, waiting the command response for a proper time
period, and then the
3.3Vaux
supply can be removed.
An abrupt hardware shutdown occurs on TOBY-L1 series modules when a low level is applied on the
RESET_N
pin for at least 1 second. 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.
