Gemalto M2M GmbH BGS5 User Manual
Cinterion
®
Java Terminals Hardware Interface Overview
3.9 Automatic thermal shutdown
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EHSxT_BGS5T_HIO_v01
2014-02-26
Confidential / Preliminary
Page 29 of 41
3.9
Automatic thermal shutdown
An on-board NTC measures the temperature of the built-in BGS2 module. If over- or undertem-
perature is detected on the module the Java Terminals automatically shut down to avoid ther-
mal damage to the system.
perature is detected on the module the Java Terminals automatically shut down to avoid ther-
mal damage to the system.
Table 17
specifies the ambient temperature threshold for the Java
Terminals.
The automatic shutdown procedure is equivalent to the power-down initiated with the
AT^SMSO command, i.e. Java Terminals log off from the network and the software enters a
secure state avoiding loss of data. In IDLE mode it takes typically one minute to deregister from
the network and to switch off.
AT^SMSO command, i.e. Java Terminals log off from the network and the software enters a
secure state avoiding loss of data. In IDLE mode it takes typically one minute to deregister from
the network and to switch off.
Alert messages transmitted before the Java Terminals switch off are implemented as Unsolic-
ited Result codes (URCs). For details see the description of AT^SCTM command provided in
ited Result codes (URCs). For details see the description of AT^SCTM command provided in
.
Thermal shutdown will be deferred if a critical temperature limit is exceeded, while an emer-
gency call or a call to a predefined phone number is in progress, or during a two minute guard
period after power up. See
gency call or a call to a predefined phone number is in progress, or during a two minute guard
period after power up. See
for details.
3.10
RTC
The internal Real Time Clock (RTC) of the Java Terminals retain the time and date and handle
the alarm (reminder) function. The AT+CCLK command serves to set the time and date, and
AT+CALA specifies a reminder message. See
the alarm (reminder) function. The AT+CCLK command serves to set the time and date, and
AT+CALA specifies a reminder message. See
for details.
A dedicated voltage regulator backs up the RTC even in POWER DOWN mode and enables
Java Terminals to keep track of time and date.
Java Terminals to keep track of time and date.
However, please note that the Alarm mode described in
, Section AT+CALA, is not intended
for the Java Terminals. The AT+CALA command can only be used to set a reminder message,
but not to configure the mobile to wake up from POWER DOWN mode into Alarm mode. There-
fore, after setting a timer with AT+CALA be sure not to shut down the Java Terminals by
AT^SMSO or RST_IN signal.
but not to configure the mobile to wake up from POWER DOWN mode into Alarm mode. There-
fore, after setting a timer with AT+CALA be sure not to shut down the Java Terminals by
AT^SMSO or RST_IN signal.