Power Supply; Turn On And Off Scenarios; Turn On Module Using The Pwrkey - Quectel Smart Wi-Fi Module Series User Manual

3.3.

Power Supply

SC20-W provides two VBAT pins dedicated to connection with the external power supply. The two
VBAT_BB pins are used for module baseband part. The power supply range of the module is 3.5V~4.2V,
and the recommended value is 3.8V.
3.4.

Turn on and off Scenarios

3.4.1.

Turn on Module Using the PWRKEY

The module can be turned on by driving PWRKEY pin to a low level for at least 1.6s. PWRKEY pin is
pulled to 1.8V 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.
≥1.6s
Turn on pulse
The other way to control the PWRKEY is 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.
SC20-W_Manual_R1.0
R1
4.7K
Figure 3: Turn on the Module Using Driving Circuit
S1
TVS
Figure 4: Turn on the Module Using Keystroke
Confidential / Released
Q1
R2
47K
PWRKEY
Close to S1
PWRKEY
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