Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 39 / 130
PWRKEY
S1
Close to S1
TVS
Figure 7: Turn on the Module Using Keystroke
The turning on scenario is illustrated in the following figure.
VBAT (Typ.: 3.8V)
PWRKEY
≥1.6s
Others
LDO5_1V8
40s
LDO6_1V8
173ms
173.5ms
438ms
LDO17_2V85
Active
Figure 8: Timing of Turning on Module
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.
NOTES