User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 35 / 90
Table 7: PWRKEY Pin Description
Pin Name Pin No. Description DC Characteristics Comment
PWRKEY 21 Turn on/off the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
The output voltage is 0.8V
because of the diode drop in
the Qualcomm chipset.
When EC25 is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin to a
low level for at least 100ms. It is recommended to use an open drain/collector driver to control the
PWRKEY.After STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be
released. A simple reference circuit is illustrated in the following figure.
Figure 10: Turn on the Module 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, aTVS component is indispensable to be placed nearby the
button for ESD protection. A reference circuit is shownin the following figure.
Figure 11: Turn on the Module Using Keystroke