Smart Module Series
SA800U-WF Hardware Design
SA800U-WF_Hardware_Design 42 / 106
1. The turn-on timing might be different from the above figure when the module powers on for the first
time.
2. Make sure that VBAT is stable before pulling down PWRKEY. It is recommended to wait until VBAT
to be stable for at least 30 ms before pulling down PWRKEY. Additionally, PWRKEY cannot be
pulled down all the time.
3.5.2. Turn on the Module Automatically Using CBL_PWR_N
The module can be turned on automatically by driving the CBL_PWR_N pin to GND through a 1 k
Ω
resistor. CBL_PWR_N pin is pulled up internally. A simple reference circuit is illustrated in the following
figure.
CBL_PWR_N
Module
1K
Figure 9: Turn on the Module Using CBL_PWR_N
The module can be turned on automatically by driving CBL_PWR_N pin to GND, and cannot be turned off
manually unless you shut down the VBAT.
NOTE
NOTES
