TC35i AT Command Set
16.3 AT^SBC
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TC35i_ATC_V02.07 Page 401 of 439 1/30/04
Confidential / Released
Unsolicited Result Codes
URC 1
Undervoltage and overvoltage conditions will be reported by unsolicited result codes. The URCs need not be
activated by the user, but will be output automatically when fault conditions occur. For further details regarding
automatic shutdown and voltage ratings please refer to [2].
^SBC: Undervoltage
The URC will be reported, for example, when you attempt to make a call while the voltage is close to the crit-
ical limit and further power loss is caused during the transmit burst. To remind you that the battery needs to
be charged soon, the URC appears several times in a minute before the module switches off. If the voltage
drops quickly down to a value which is 50mV below the minimum threshold only one URC will be presented.
URC 2
^SBC: Overvoltage warning
This URC is an alarm indicator displayed when the supply voltage approaches its maximum level. The URC
appears only once.
URC 3
^SBC: Overvoltage shutdown
This URC will be reported when the voltage exceeds the maximum level specified in the Hardware Interface
Description. It appears only once before the module starts to perform an orderly shutdown.
In applications powered from Li-Ion batteries the incorporated protection circuit typically prevents overcharg-
ing, thus eliminating the risk of overvoltage conditions. Yet, in case of charging errors, for example caused by
a bad battery or due to the absence of a battery protection circuit, the module's overvoltage shutdown function
will take effect to avoid overcharging.
The automatic shutdown procedure caused by undervoltage or overvoltage is equivalent to the power-down
initiated with the
AT^SMSO command, i.e. ME logs off from the network and the software enters a secure state
avoiding loss of data. When the module is in IDLE mode it takes typically one minute to deregister from the
network and to switch off.
Command Description
Use the write command to specify the power consumption of your external application. This information enables
the ME to calculate the average power consumption
<mpc> and to properly control the charging process. If the
value is not correct the entire charging process may be affected. Resulting problems may be wrong responses
to the
AT^SBC read command, overcharging, or the battery does not reach full capacity.
When the ME is powered down or reset, the value of
<current> is restored to its default.
Parameter Description
Connection status of charging adapter
0 No charging adapter is connected
PIN ASC0 MUX1 MUX2 MUX3
! % % % %
Reference(s)
SIEMENS
<bcs>
(num)
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