Smart Module Series
SC200K_Series_Hardware_Design 38 / 105
The turn-on timing is illustrated in the following figure.
VBAT (Typ. 3.8 V)
PWRKEY
> 2.5 s
VDD1V85
607.4 ms
VDD28
400
μs
ACTIVE
Note 1
VDDCAMIO
VDDCAMA
Software
Controlled
> 1 s
Others
55 s
Figure 9: Turn-on Timing
3.2.2. Turn On Module Automatically Through CBL_PWR_N
Table 8: Pin Definition of CBL_PWR_N Interface
1. Make sure that VBAT is stable before pulling down the PWRKEY pin. It is recommended to drive
PWRKEY low after VBAT reaches 3.8 V and remains stable for 30 ms. PWRKEY pin cannot be
pulled down all the time.
2. When the module is powered on for the first time, its turn-on timing may be different from that
shown in the figure above.
Pin Name
Pin No.
I/O
Description
CBL_PWR_N
186
DI
Initiates power-on when grounded.
NOTE