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MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 22 of 42 16.02.2007

3.5.1.4 Disconnecting power supply

Before disconnecting the power supply from the PLUS pin, make sure that the MC35i

Terminal is in a safe condition. The best way is to wait 1s after the "^SHUTDOWN" result

code has been indicated.

3.5.1.5 Automatic thermal shutdown

An on-board NTC measures the temperature of the built-in MC35i module. If over- or

undertemperature is detected on the module the MC35i Terminal automatically shuts down

to avoid thermal damage to the system.

Table 17 and Table 18 specify the ambient

temperature thresholds for the MC35i Terminal and the equivalent thresholds of the MC35i

module.

The automatic shutdown procedure is equivalent to the power-down initiated with the

AT^SMSO command, i.e. MC35i Terminal logs 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 MC35i Terminal switches off are implemented as

Unsolicited Result codes (URCs). For details see the description of AT^SCTM command

provided in

[1].

Thermal shutdown will be deferred if a critical temperature limit is exceeded, while an

emergency call or a call to a predefined phone number is in progress, or during a two minute

guard period after power up. See

[1] for details.

3.5.1.6 RTC

The internal Real Time Clock (RTC) of the MC35i Terminal retains the time and date and

handles the alarm (reminder) function. The AT+CCLK command serves to set the time and

date, and AT+CALA specifies a reminder message. See

[1] for details.

A dedicated voltage regulator backs up the RTC even in POWER DOWN mode and enables

MC35i Terminal to keep track of time and date.

However, please note that the Alarm mode described in

[1], Section AT+CALA, is not

intended for the MC35i Terminal. 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. Therefore, after setting a timer with AT+CALA be sure not to shut down the

MC35i Terminal by AT^SMSO or PD_IN signal.

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