FALCOM I56 Hardware Description page 39

I65/I56I HARDWARE DESCRIPTION
5.6.5.1 Comparison Charge-only and Charge mode
5.6.5.1.1 Charge mode
In order to activate the charge mode, connect charger to charger input of
external charging circuit and the POWER pin of module while the GSM/GPRS
part of the I56/I56i is in the following modes:
operating, e.g. in IDLE or TALK mode
in SLEEP mode
The features while the charge mode is:
Battery can be charged while GSM engine remains operational and
registered to the GSM network.
In IDLE and TALK mode, the serial interfaces are accessible. AT
command set can be used to full extent.
In the NON-CYCLIC SLEEP mode, the serial interfaces are not
accessible at all. During the CYCLIC SLEEP mode they can be used as
described in chapter 5.9.3.
5.6.5.1.2 Charge-only mode
In order to activate the charge-only mode, connect charger to charger input of
external charging circuit and the POWER pin of module while the GSM/GPRS
part of the I56/I56i is:
in POWER DOWN mode
in Normal mode: Connect charger to the POWER pin, then enter
AT^SMSO.
IMPORTANT:
The features while the charge-only mode is:
Battery can be charged while GSM engine is deregistered from GSM
network.
Charging runs smoothly due to constant current consumption.
The AT interface is accessible and allows to use the commands listed
below.
Features of Charge-only mode
Once the GSM engine enters the Charge-only mode, the AT command
interface presents an Unsolicited Result Code (URC) which reads:
^SYSSTART CHARGE-ONLY MODE
Note that this URC will not appear when autobauding was activated (due to the
missing synchronization between DTE and DCE upon start-up). Therefore, it is
recommended to select a fixed baud rate before using the Charge-only mode.
While the Charge-only mode is in progress, you can only use the AT
commands listed in table 13 below. For further instructions refer to the AT
Command Set supplied with your GSM engine.
AT command
AT+CALA
AT+CCLK
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While trickle charging is in progress, be sure that the
application is switched off. If the application is fed from the
trickle charge current the module might be prevented from
proceeding to software controlled charging since the current
would not be sufficient.
Function
Set alarm time
Set date and time of RTC
VERSION 1.00
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