Specifications

AC65/AC75 Hardware Interface Description
3.5 Charging Control
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AC65_AC75_HD_v01.002 Page 44 of 117 2006-10-30
Confidential / Released
3.5.7 Operating Modes during Charging
Of course, the battery can be charged regardless of the engine's operating mode. When the GSM module is in
Normal mode (SLEEP, IDLE, TALK, GPRS IDLE or GPRS DATA mode), it remains operational while charging
is in progress (provided that sufficient voltage is applied). The charging process during the Normal mode is
referred to as Charge mode.
If the charger is connected to the charger input of the external charging circuit and the module’s VCHARGE pin
while AC65/AC75 is in Power-down mode, AC65/AC75 goes into Charge-only mode.
While the charger remains connected it is not possible to switch the module off by using the AT^SMSO command
or the automatic shutdown mechanism. Instead the following applies:
• If the module is in Normal mode and the charger is connected (Charge mode) the AT^SMSO command
causes the module to shut down shortly and then start into the Charge-only mode.
• In Charge-only mode the AT^SMSO command is not usable.
• In Charge-only mode the module neither switches off when the battery or the module exceeds the critical lim-
its of overtemperature or undertemperature.
In these cases you can only switch the module off by disconnecting the charger.
To proceed from Charge-only mode to another operating mode you have the following options, provided that the
battery voltage is at least above the undervoltage threshold.
• To switch from Charge-only mode to Normal mode you have two ways:
- Hardware driven: The ignition line (IGT) must be pulled low for at least 2 seconds. When released, the IGT
line goes high and causes the module to enter the Normal mode.
- AT command driven: Set the command AT^SCFG=MEopMode/Airplane,off (please do so although the
current status of Airplane mode is already “off”). The module will enter the Normal mode, indicated by the
“^SYSSTART” URC.
• To switch from Charge-only mode to Airplane mode set the command AT^SCFG=MEopMode/Airplane,on.
The mode is indicated by the URC “^SYSSTART AIRPLANE MODE”.
• If AT^SCFG=MEopMode/Airplane/OnStart,on is set, driving the ignition line (IGT) activates the Airplane
mode. The mode is indicated by the URC “^SYSSTART AIRPLANE MODE”.
Table 9: AT commands available in Charge-only mode
AT command Use
AT+CALA Set alarm time, configure Airplane mode.
AT+CCLK Set date and time of RTC.
AT^SBC Query status of charger connection.
AT^SBV Monitor supply voltage.
AT^SCTM Query temperature range, enable/disable URCs to report critical temperature ranges
AT^SCFG Enable/disable parameters MEopMode/Airplane or MEopMode/Airplane/OnStart