Smart Module Series
SC262R_Series_Hardware_Design 39 / 115
The turning-on scenario is illustrated in the following figure.
VBAT(Typ. 3.8 V)
PWRKEY
> 1.6 s
Others
LDO5_1V8
38 s
LDO6_1V8
47 ms
Software
controlled
LDO17_2V85
Active
Note2
Software
controlled
Figure 8: Timing of Turning On the Module
1. When the module is powered on for the first time, its timing of turning on 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 pulling down all the time.
3.5.2. Turn Off the Module
Drive the PWRKEY pin low for at least 1 s, and then choose to turn off the module when the prompt
window comes up.
You can also force the module to power off by driving PWRKEY low for at least 8 s. The forced
power-down scenario is illustrated in the following figure.
NOTE
