Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-36
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Figure 10: Turn on the Module by Using Driving Circuit
The other way to control the PWRKEY is using a button directly. When pressing the key, electrostatic
strike may generate from finger. Therefore, a TVS component is indispensable to be placed nearby the
button for ESD protection. A reference circuit is shown in the following figure.
Figure 11: Turn on the Module by Using Button
The turn on scenario is illustrated in the following figure.