Turn On - Quectel SC690A Series Hardware Design

3.2. Turn on

Table 8: Pin Definition of PWRKEY
Pin Name
PWRKEY
The module can be turned on by driving the PWRKEY pin to a low level for at least 1.6 s. PWRKEY pin
is pulled to 1.8 V internally.
It is recommended to use an open drain/collector driver to control the PWRKEY. A simple reference
circuit is illustrated in the following figure.
The other way to control the PWRKEY is by using a button directly. A TVS component is indispensable
to be placed nearby the button for ESD protection. A reference circuit is shown in the following figure.
SC690A_Series_Hardware_Design
Pin No. I/O
39 DI
> 1.6 s
Turn on pulse
GPIO
Q1
MCU
Figure 7: Turn on the Module Using Driving Circuit
S1
TVS
Close to S1
Figure 8: Turn on the Module Using Keystroke
Description
Turn on/off the module
R1
R2
1 K
Turn-on pulse
Smart Module Series
Comment
Pull up to 1.8 V internally.
Active low.
PWRKEY
Module
PWRKEY
Module
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