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Enfora Enabler IIIG M2M
Modem Integration Guide
6.6.10. VBACKUP 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 6.6.7)
V
BACKUP
Parameter/Conditions
Min
Typ
Max
Units
Input Voltage
Range
ON mode
2.5
V
CC
1
5.5
Vdc
BACKUP mode, VBAT=0v
1.9
V
BACKUP
5.5
BACKUP mode, VBACKUP=0v
1.9
V
CC
2
3.0
Input Current
10
μ
A
6.6.11. Using VBACKUP
V
BACKUP
is a backup voltage that can maintain the RTC clock and alarm functions. If
V
BACKUP
is not
present in the system (intentionally or not) the RTC clock may still be powered if leakage voltage exists on
VCC. Otherwise, the RTC clock will lose power and be reset when VCC is restored.
PARAMETER
Parameter/Conditions
Min
Typ
Max
Units
Backup Voltage (Real-Time-Clock)
V
BACKUP
Backup Voltage for Real-Time-Clock
2.7
3.0
4.5
Vdc
I
BACKUP
Input Current (V
BACKUP
= 3.2 V, V
BAT
= 0
V, No Load on GPIO or Serial Port)
3.0
6.0
μ
Adc
V
BACKUP
had been tested in the above scenarios and does not contribute to leakage. It will properly provide
backup power to the RTC clock.
6.6.12. 32 kHz output (Pin 56)
A 32.768 kHz signal is available as an output from the module. This signal should only be used as an
input to a high impedance device. Additional loads or capacitance on the line may cause performance
issues with the module. If the line is not used, leave floating.
32kHz Clock-Out
Parameter/Conditions
Min
Typ
Max
Units
V
IH
Vdc
V
IL
Vdc
Maximum capacitor load
tbd
pF
Maximum resistive load
Ω
Frequency
±
30 ppm
32.768
kHz
GSM0308IG002
49
Version 1.05 – 11/13/08