User's Manual

GSM/GPRS Module Series
M35 User Manual
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Non-chargeable
Backup Battery
Module
RTC
Core
VBAT
Power Supply
LDO/DCDC
LDO
VRTC
1.5K
Figure 14: VRTC Is Supplied by a Non-chargeable Battery
Rechargeable
Backup Battery
Module
RTC
Core
VBAT
Power Supply
LDO/DCDC
LDO
VRTC
1.5K
Figure 15: VRTC Is Supplied by a Rechargeable Battery
Module
RTC
Core
VBAT
Power Supply
LDO/DCDC
LDO
VRTC
1.5K
Large Capacitance
Capacitor
Figure 16: VRTC Is Supplied by a Capacitor