LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 37 / 106
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. Description DC Characteristics Comment
PWRKEY 15 Turn on/off the module V
OH
=0.8V
The output voltage is 0.8V
because of the diode drop in
the Qualcomm chipset.
When EG91 series module 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 outputting a high 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
Another way to control the PWRKEY is using a button directly. When pressing the key, electrostatic strike
may generate from the 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.
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