Power-On/Off Scenarios; Turn On Module Using The Pwrkey - Quectel EC25-AUX Hardware Design

3.7. Power-on/off Scenarios

3.7.1. Turn on Module Using the PWRKEY

The following table shows the pin definition of PWRKEY.
Table 7: Pin Definition of PWRKEY
Pin Name Pin No.
PWRKEY 21
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 500ms. It is recommended to use an open drain/collector driver to control the
PWRKEY. After STATUS pin (require external pull-up resistor) outputs a low level, PWRKEY pin can be
released. A simple reference circuit is illustrated in the following figure.
≥ 500ms
Turn-on pulse
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.
EC25_Hardware_Design
I/O Description
DI Turn on/off the module
4.7K
Figure 10: Turn on the Module by Using Driving Circuit
LTE Standard Module Series
EC25 Hardware Design
Comment
The output voltage is 0.8V because of
the diode drop in the Qualcomm chipset.
PWRKEY
10nF
47K
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