Smart Module Series
SC262R_Series_Hardware_Design 38 / 115
2. The module supports battery charging by default. If the above power supply design is adopted, make
sure the charging function is disabled by software, or connect VBAT to a Schottky diode in series to
avoid the reverse current to the power supply chip.
3.5. Turn On and Off
3.5.1. Turn On with PWRKEY
The module can be turned on by driving the PWRKEY pin low for at least 1.6 s. The PWRKEY pin is
pulled up to 1.8 V internally. It is recommended to use an open drain/collector driver to control PWRKEY.
A simple reference circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
>1.6 s
R1
R2
Q1
R3
1K
Figure 6: Turn On the Module Using Driving Circuit
The other way to control PWRKEY is using a button directly. You must place a TVS component nearby
the button for ESD protection. A reference circuit is shown in the following figure.
PWRKEY
S1
Close to S1
TVS
1K
Figure 7: Turn On the Module Using Button
