Quectel SC200R Series Hardware Design page 44

Smart Module Series
The other way to control PWRKEY is by using a button directly. You must place a TVS component nearby
the button for ESD protection. A reference circuit is shown in the following figure.
S1
PWRKEY
1K
TVS
Close to S1
Figure 6: Turn on the Module Using Keystroke
The turning-on scenario is illustrated in the following figure.
Note2
VBAT(Typ. 3.8 V)
PWRKEY
> 1.6 s
47 ms
LDO5_1V8
Software
controlled
Software
controlled
LDO6_1V8
LDO17_2V85
38 s
Others
Active
Figure 7: Timing of Turning on the Module
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