Quectel M20

M20 Hardware Design
RTC
Core
3.9K
Module
VRTC
Non-chargeable
Backup Battery

Figure 16: RTC supply from non-chargeable battery
RTC
Core
3.9K
Module
VRTC
Rechargeable
Backup Battery
Figure 17: RTC supply from rechargeable battery
RTC
Core
3.9K
Module
VRTC
Large-capacitance
Capacitor
Figure 18: RTC supply from capacitor
Coin-type rechargeable capacitor such as XH414H-IV01E form Seiko can be used.
M20_HD_V1.01 - 42 -
Quectel