Product Info

Smart LTE Module Series
SC66 Hardware Design
SC66_Hardware_Design 46 / 118
In addition, when VBAT is powered on, the module will be powered on automatically. The reference
circuit is shown below:
CBL_PWR_N
(Pin22)
SC66
1K
Figure 8: Automatic Boot Reference Circuit
Make sure that VBAT is stable before pulling down PWRKEY pin. The recommended time between them
is no less than 30ms. PWRKEY cannot be pulled down all the time.
3.5.2. Restart the Module
Pull down PWRKEY for at least 1s, and then choose to turn off or restart the module when the prompt
window comes up.
Another way to Restart the module is to drive PWRKEY to a low level for at least 8s. The module will
execute Restart. The restart scenario is illustrated in the following figure.
VBAT
PWRKEY
Others
> 8
s
RESTART
Figure 9: Timing of Restarting Module
NOTE