SC20-W_Manual_R1.0 Confidential / Released 15 / 41
The turn on scenario is illustrated in the following figure.
VBAT
PWRKEY
>1.6s
Others
1
LDO5_1V8
30s
LDO6_1V8
173ms
173.5ms
438ms
LDO17_2V85
Active
Figure 5: Timing of Turning on Module
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.
3.4.2.
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.
VBAT
PWRKEY
Others
>8s
Power down
NOTE:
