Quectel UC20 Hardware Design page 32

reference circuit is illustrated in the following figure.
The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be
placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate
from finger. A reference circuit is showed in the following figure.
The turn on scenarios is illustrated as the following figure.
UC20_Hardware_Design
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≥ 100ms
Turn on pulse
Figure 9: Turn on the Module Using Driving Circuit
S1
Figure 10: Turn on the Module Using Keystroke
4.7K
47K
TVS
Close to S1
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
PWRKEY
PWRKEY
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