Specifications

AT Command Set Reference
Ver. 1.00
GSM1308AT001 Page 404 Ver. 1.00 – 10/29/2008
4.16.28. $BBCHG Recharge Backup Battery
Command Function The backup battery can be recharged from
the main battery. A programmable voltage
regulator powered by the main battery
allows recharging the backup battery.
VBACKUP (pin 83) can be enabled to
supply a charging voltage.
Command Functional Enfora Specific
Group
Command Format Query AT$BBCHG=?
Response $BBCHG: (0-1),(0-3)
OK
Write Format AT$BBCHG=<Mode>,<VoltageSetting>
Response OK
Read Format N/A
Response N/A
Execution Format AT$BBCHG?
Response $BBCHG: 0,1
Parameter Values
<Mode> 0 – Disable the backup battery charger
circuit (factory default)
1 – Enable the backup battery charger
circuit
<VoltageSetting> 0 – 3.1V
1 – 3.2V (factory default)
2 – 3.0V
3 – VBAT
Reference N/A
Standard Scope Optional