User's Manual

Smart Machine Smart Decision
SIM5320_Hardware Design_V1.01 2011-11-10
22
RTC
Core
MODULE
VRTC
Non-chargeable
Backup Battery
Figure 11: RTC supply from capacitor
z Non-chargeable battery backup
Figure 12: RTC supply from non-chargeable battery
z Rechargeable battery backup
Figure 13: RTC supply from rechargeable battery
Note: The VRTC can be disabled, jus disconnect it in application circuit.
Coin-type rechargeable battery is recommended, such as XH414H-IV01E form Seiko can be used.
Typical charge-discharge curves for this battery are shown in the following figure.