Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 36 / 111
The turning-on scenario is illustrated in the following figure.
VBAT (Typ. 3.8 V)
PWRKEY
> 2.5 s
LDO1_1V85
607.4 ms
LDO4_2V8
400
μs
ACTIVE
NOTE 2
LDO2_1V8
LDO3_2V8
Software
Controlled
> 1 s
Others
55 s
Figure 8: Power-Up Timing
1. When the module is powered on for the first time, its timing of power-up may be different from that
shown above.
2. Make sure that VBAT is stable before pulling down PWRKEY. It is recommended to wait until VBAT
to be stable at 3.8 V for at least 30 ms before pulling down PWRKEY. Additionally, PWRKEY cannot
be kept pulled down all the time.
NOTE