Turn Off/Restart - Quectel SG865W Series Hardware Design

The power-up timing is illustrated in the following figure.
VBAT (Typ: 3.8 V)
PWRKEY
VREG_BOB
VREG_S4A_1V8
LDO12A_1V8
Others
NOTE
1. When the module is powered on for the first time, its power-up timing may be different from that
shown in the figure above.
2. Make sure that VBAT is stable before pulling down the PWRKEY pin. The recommended time
between them is no less than 30 ms. PWRKEY pin cannot be pulled down all the time.

3.3. Turn Off/Restart

The module can be turned off by driving PWRKEY low for at least 1 s. Then the module will detect a
turn-off action and a prompt window will pop up on the screen. You can choose to turn off the module in
the prompt window.
The other way to turn off the module is by driving PWRKEY low for at least 8 s. The module will execute
the forced shutdown. The forced power-down timing is illustrated in the following figure.
SG865W_Series_Hardware_Design
NOTE 2
> 1.6 s
50 ms
Software
controlled
Software
controlled
Figure 10: Power-up Timing
38 s
Smart Module Series
Active
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