Turn Off/Restart; Vrtc - Quectel SG560D Series Hardware Design

3.3. Turn Off/Restart

The module can be turned off by driving the PWRKEY pin low for at least 3 s. If the PWRKEY pin is pulled
low for at least 3 s, you can choose to turn off the module in the prompt window popped up.
It is also possible to restart the module by driving the PWRKEY pin low for at least 8 s. If the PWRKEY pin
is pulled low for at least 8 s, the module will execute a forced shut-down and then restart. The restart
timing is illustrated in the following figure.
VBAT
PWRKEY
Others

3.4. VRTC

The RTC (Real Time Clock) can be powered by an external power source when the module is powered
down and there is no power supply for the VBAT. The external power source can be a capacitor
according to application demands.
The following are reference circuit designs when an external battery is utilized for powering RTC.
SG560D_Series_Hardware_Design
Figure 9: Restart Timing
Cell Battery
Figure 10: RTC Powered by a Rechargeable Cell Battery
≥ 8 s
Hardware Restart
VRTC
Smart Module Series
RTC
Core
Module
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