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The turn on scenario is illustrated in the following figure.
VBAT (Typ.: 3.8V)
PWRKEY
LDO5_1V8
LDO6_1V8
LDO17_2V85
Others
NOTES
1. When the module is powered on for the first time, its timing of turning on will be 45ms longer than that
shown above.
2. Make sure that VBAT is stable before pulling down PWRKEY pin. The recommended time between
them is no less than 30ms. PWRKEY pin cannot be pulled down all the time.
3.5.2. Turn off Module
Set the PWRKEY pin low for at least 1s, and then choose to turn off the module when the prompt window
comes up.
The other way to turn off the module is to drive PWRKEY to a low level for at least 8s. The module will
execute forced shutdown. The forced power-down scenario is illustrated in the following figure.
SC20-WL_Hardware_Design
≥1.6s
173ms
173.5ms
438ms
Figure 8: Timing of Turning on Module
Smart Wi-Fi Module Series
SC20-WL Hardware Design
40s
Active
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