Siemens Brodersen MC55 AT - Manual (Page 431)

MC55_ATC_V04.00 Page 431 of 475 3/17/06
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^SBC: Undervoltage
The message will be reported, for example, when the user attempts to set up a call while the voltage is close to
the critical limit and further power loss is caused during the transmit burst. When the external charging circuit
includes an NTC connected to the BATT_TEMP pin, the URC appears several times before the module switches
off.
The undervoltage protection is also efficient in applications which are not battery operated, i.e. where no NTC is
connected to the BATT_TEMP pin. To use this feature it is sufficient to issue the write command which automat-
ically enables the presentation of URCs. You do not need to specify
<current>
. Please note, that in contrast
to applications with an NTC, MC55 will present the undervoltage URC only once and will then switch off without
sending any further messages.
Parameter Description
Connection status of battery pack
0
No charging adapter is connected
1 Charging adapter is connected
2 Charging adapter is connected, charging in progress
3 Charging adapter is connected, charging has finished
4 Charging error, charging is interrupted
5 False charging temperature, charging is interrupted while temperature is
beyond allowed range
Battery capacity
0, 20, 40, 60, 80, 100 percent of remaining capacity (6 steps).
0 indicates that either the battery is exhausted or the capacity value is not available.
While charging is in progress (charging adapter connected) the battery capacity is not available. Consequently,
parameter
<bcl>
=0. To query the battery capacity disconnect the charger.
Average current consumption.
Value (0...5000) of average current consumption (mean value over a couple of seconds) in mA.
<mpc>
is obtained from the MC55's current consumption, plus the value you have specified for the application
by using the write command
AT^SBC
=
<current>
. Remember that the current consumption of MC55 varies
with its operating mode (IDLE, TALK, DATA, GPRS/DATA) and the power level.
If
<current>
was not yet specified and no battery pack NTC is detected
<mpc>
returns only the module's
present current consumption.
If
<current>
was not yet specified, but the NTC of the connected battery pack is detected, an offset value of
200mA will, by default, be added. 200mA is an estimated value which represents the current consumption of a
typical external application. Drawn from practical experience it serves as a precaution to ensure proper charging
in case you have not entered
<current>
. It is strongly recommended that you enter the correct power con-
sumption of your application as described below.
Enter the current consumption of your host application in mA (0...5000). If used, the current provided over the
2.9V VDD pin of the application interface (maximum 70mA) must be added, too.
When the MC55 is powered down or reset, the value of
<current>
is restored to its default. This affects the
charging control and disables the presentation of Unsolicited Result Codes. Therefore, the parameter should be
set every time when needed after rebooting the MC55.
<bcs>
(num)
<bcl>
(num)
<mpc>
(num)
<current>
(num)