Siemens TC63 Atsbc Battery Charge Control, Atsbc=?, Atsbc?, SBC bcs, bcl, mpc, ATSBC=current

TC63 AT Command Set

19.3 AT^SBC

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19.3AT^SBC Battery Charge Control

The functions of the AT^SBC differ depending on whether or not a battery is present.

•General functions:

The AT^SBC write command enables the presentation of URCs alerting the user of undervoltage and over- voltage conditions before the module switches off. The automatic shutdown caused by undervoltage or over- voltage 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. For further details regarding auto- matic shutdown and voltage ratings please refer to the Hardware Interface Description [2].

•Functions available with battery connected:

The AT^SBC read command can be used to query the status of the battery and the charger.

The AT^SBC write command is important for entering the current consumption of the external application via <current>. It should be noted that the charge control supported by TC63 works only if the requirements described in the Hardware Interface Description [2] are met (battery type Lithium-Ion or Lithium Polymer, presence of an NTC and protection circuit etc.) and if <current> is correctly specified. If the battery does not incorporate an NTC, or the battery and the NTC are not compliant with the specified requirements the battery cannot be detected by TC63.

Syntax

Test Command

AT^SBC=?

Response(s)

^SBC:(list of supported <bcs>s), (list of supported <bcl>s), (list of supported <mpc>s)

OK

Read Command

AT^SBC?

Response(s)

^SBC: <bcs>, <bcl>, <mpc>

OK ERROR

+CME ERROR: <err>

Write Command

AT^SBC=<current>

Response(s)

OK ERROR

+CME ERROR: <err>

Reference(s)

SIEMENS

PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

! % % % % % % § % !

Unsolicited Result Codes

URC 1

^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 cir- cuit includes an NTC connected to the BATT_TEMP pin, the URC appears several times before the module switches off.

In applications which are not battery operated, i.e. where no NTC is connected to the BATT_TEMP pin, TC63 will present the undervoltage URC only once and will then switch off without sending any further messages.

TC63_ATC_V00.490	Page 440 of 501	5/24/05
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