AC75 Hardware Interface Description
Strictly confidential / Preliminary
s
AC75_HD_V00.202
Page 30 of 120
27.04.2006
3.3.1.3
Turn on AC75 Using the VCHARGE Signal
As detailed in Section 3.5.7, the charging adapter can be connected regardless of the
module’s operating mode.
If the charger is connected to the charger input of the external charging circuit and the
module’s VCHARGE pin while AC75 is off, and the battery voltage is above the undervoltage
lockout threshold, processor controlled fast charging starts (see Section 3.5.6). AC75 enters
a restricted mode, referred to as Charge-only mode where only the charging algorithm will be
launched.
During the Charge-only mode AC75 is neither logged on to the GSM network nor are the
serial interfaces fully accessible. To switch from Charge-only mode to Normal mode the
ignition line (IGT) must be pulled low for at least 1 second. When released, the IGT line goes
high and causes the module to enter the Normal mode. See also Section 3.5.7.
3.3.1.4
Reset AC75 via AT+CFUN Command
To reset and restart the AC75 module use the command AT+CFUN. You can enter
AT+CFUN=,1 or AT+CFUN=x,1, where x may be in the range from 0 to 9. See [1] for details.
If configured to a fix baud rate (AT+IPR
≠
0), the module will send the URC “^SYSSTART” or
“^SYSSTART AIRPLANE MODE” to notify that it is ready to operate. If autobauding is
enabled (AT+IPR=0) there will be no notification. To register to the network SIM PIN
authentication is necessary after restart.
