Ublox MPCI-L1 series, Руководство по системной интеграции

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TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04 Advance Information System description
Page 27 of 90
1.6.3 Module reset
TOBY-L1 and MPCI-L1 series modules can be properly reset (rebooted) by:
•
AT+CFUN command (see the TOBY-L1/ MPCI-L1 series AT Commands Manual [3]).
MPCI-L1 series modules can be additionally properly reset (rebooted) by:
•
AT+CPWROFF command (see TOBY-L1/ MPCI-L1 series AT Commands Manual [3]): the behavior differs
than TOBY-L1 series, as MPCI-L1 modules will reboot rather than remain switched off due to MPCI-L1
modules’ internal configuration.
Implementing the procedures listed above, a “software” reset of the module is executed. During the process,
the current parameter settings are saved in the module’s non-volatile memory and a proper network detach is
performed.
An abrupt hardware shutdown occurs on TOBY-L1 modules when a low level is applied on the
RESET_N
input
pin for at least 1 second. Then, a low level has to be applied on the PWR_ON input pin for at least 5 seconds to
force a reboot of the module. Implementing this procedure, the current parameter settings are not saved in the
module’s non-volatile memory and a proper network detach is not performed.
An abrupt hardware reset (reboot) occurs on MPCI-L1 modules when a low level is applied on the
PERST#
input
pin for at least 1 second. Implementing this procedure, 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 / reset of the module by forcing a low
level on the
RESET_N
or
PERST#
input during modules normal operation: the
RESET_N
or
PERST#
line
should be set low only if reset or shutdown via AT commands fails.
The electrical characteristics of
RESET_N and PREST# input pins are different from the other digital interfaces.
As described in Figure 14, both RESET_N and PERST# lines are pulled high to the internal 2.5 V rail ( V_BCKP ).
Therefore an external pull-up is not required. For the detailed electrical characteristics refer to TOBY-L1 series
Data Sheet [1] or MPCI-L1 series Data Sheet [2].
Baseband
Processor
23 RESET_N
TOBY-L1 series
Reset
10k
Baseband
Processor
22
PERST#
MPCI-L1 series
Reset
10k
2.5V
2.5V
Figure 14: TOBY-L1 and MPCI-L1 series reset input (RESET_N / PERST#) description