User's Manual

Smart Machine Smart Decision
SIM5320A_Hardware Design_V1.01 2011-2-29
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z Non-chargeable battery backup
Figure 14: RTC supply from non-chargeable battery
z Rechargeable battery backup
Figure 15: 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.
Figure 16: Seiko XH414H-IV01E Charge-Discharge characteristic