SIM5218E Hardware Design
the VRTC, User may connect the VRTC pin to a battery or a capacitor.
The following figures show various sample circuits for RTC backup.
Figure
8:
RTC supply from non-chargeable battery
Figure
9:
RTC supply from rechargeable battery
Figure
10:
RTC supply from capacitor
z
Li-battery backup
Rechargeable Lithium coin cells are also small in size, but have higher capacity than the double
layer capacitors resulting in longer backup times. The coin cell normal voltage should be 3.0V
SIM5218E_ Hardware Design_V1.06
2012.09.21
25
Содержание SimCom SIM5218E
Страница 1: ...SIM5218E_Hardware Design_V1 06...