Using Vbak; 32 Khz Output (Pin 56); 13 Mhz Output (Pin 52) - Enfora Enabler III-G Integration Manual

Enfora Enabler III-G
Modem Integration Guide

6.6.17. Using VBAK

VBAK is a backup voltage that can maintain the RTC clock and alarm functions. If VBAK 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
Backup Voltage (Real-Time-Clock)
V
Backup Voltage for Real-Time-Clock
BACKUP
I Input Current (V
BACKUP
No Load on GPIO or Serial Port)
VBAK had been tested in the above scenarios and does not contribute to leakage. It will properly provide
backup power to the RTC clock.

6.6.18. 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
V
IH
V
IL
Maximum capacitor load
Maximum resistive load
Frequency

6.6.19. 13 MHz output (Pin 52)

A 13 MHz 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.
13 MHz Clock-Out
V
IH
V
IL
Maximum capacitor load
Maximum resistive load
Frequency
GSM0308PB001
= 3.2 V, V
BACKUP
Parameter/Conditions
± 30 ppm
Parameter/Conditions
±0.1 ppm when registered on
GSM network;
±12 ppm typical when not
registered;
49
MIN
2.7
= 0 V,
BAT
Min
32.768
Min
TBD
13.000
Version DRAFT – 2/9/2007
TYP MAX UNIT
3.0 4.5 Vdc
μAdc
3.0 6.0
Typ Max Units
Vdc
Vdc
tbd pF
Ω
kHz
Typ Max Units
Vdc
0.3 Vdc
TBD pF
Ω
TBD
MHz