Enfora Enabler III-G
Modem Integration Guide
6.6.16. V
BACKUP
Input (Pin 83)
The backup battery can be recharged from the main battery. A programmable voltage regulator powered
by the main battery allows recharging the backup battery. The backup battery charge starts when the
following conditions are met:
Backup battery charge is enabled by a control bit:
•
Main Battery voltage > Backup Battery voltage
•
Main battery > 2.8 Vdc
Note: If the backup battery is not present, the backup battery pin is connected to main battery pin
V
BACKUP
is a power input for the Real-Time-Clock when using RTC-Sleep Function (Section 6.6.10)
V
BACKUP
Parameter/Conditions Min
Typ
Max
Units
ON mode
2.5
V
CC
1 5.5
BACKUP mode, VBAT=0v
1.9
V
BACKUP
5.5
Input Voltage Range
BACKUP mode, VBACKUP=0v
1.9
V
CC
2 3.0
Vdc
Input Current
10
μ
A
GSM0308PB001
48
Version DRAFT – 2/9/2007