Smart Machine Smart Decision
SIM800C_Hardware_Design_V1.00 24 2014-10-30
Note: Autobauding is default. It cannot enter sleep mode in the absence of synchronous serial port baud rate
after module power on.
4.4. Power Saving Mode
Current input for RTC when the VBAT is not supplied for the system. Current output for backup battery when
the VBAT power supply is in present and the backup battery is in low voltage state. The RTC power supply of
module can be provided by an external capacitor or a battery (non-chargeable or rechargeable) through the VRTC.
The following figures show various reference circuits for RTC back up.
External capacitor backup
RTC
Core
2.2K
Module
VRTC
Large-capacitance
Capacitor
Figure 15: RTC supply from capacitor
Non-chargeable battery backup
RTC
Core
2.2K
Module
VRTC
Non-chargeable
Backup Battery
Figure 16: RTC supply from non-chargeable battery
Rechargeable battery backup
RTC
Core
2.2K
Module
VRTC
Rechargeable
Backup Battery
Figure 17: RTC supply from rechargeable battery
To Next Page
Loading...
Need help?
General
