Siemens AC75 ユーザーズマニュアル

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AC75_ATC_V01.002

Page 486 of 569

10/30/06

Confidential / Released

The functions of the 

 differ depending on whether or not a battery is present. 

• General functions:

The 

 provides URCs used to alert the user of undervoltage and overvoltage conditions before the

module switches off. The automatic shutdown caused by undervoltage or overvoltage is equivalent to the

power-down initiated with the 

 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 dereg-

ister from the network and to switch off. For further details regarding automatic shutdown and voltage ratings

please refer to the Hardware Interface Description 

. 

The URCs do not need to activated by the TE. They will be output automatically when fault conditions occur. 

• Functions available with battery connected: 

The 

 read command can be used to query the status of the battery and the charger. 

The 

 write command is important for entering the current consumption of the external application via

. It should be noted that the charge control supported by AC75 works only if the requirements

described in the Hardware Interface Description 

 are met (battery type Lithium-Ion or Lithium Polymer,

presence of an NTC and protection circuit etc.) and if 

 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 AC75. 

 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, AC75

will present the undervoltage URC only once and will then switch off without sending any further messages. 

Test Command

AT^SBC=?

Response(s)

^SBC:

(list of supported 

s), (list of supported 

s), (list of supported 

s)

OK

Read Command

AT^SBC?

Response(s)

^SBC: 

OK 

ERROR 

Write Command

Response(s)

OK 

ERROR 

Reference(s)

PIN

ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge

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