Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 46 / 134
released. A simple reference circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
 500 ms
10 nF
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.
PWRKEY
S1
Close to S1
TVS
Figure 11: Turn on the Module by Using Keystroke
The power-on scenario is illustrated in the following figure.