
NE866B1_Hardware_Design_Guide
1VV0301354 Rev. 6
Page
32
of
70
2018-02-28
Power On
The NB866B1 will automatically power on itself when VBATT is applied to the module.
VAUX / PWRMON pin will be then set at the high logic level.
The following flow chart shows the proper turn on procedure:
PWRMON=ON
?
“Modem ON Proc”
START
PWR Supply ON
PWRMON=ON
?
Delay = 8 s
AT Init Sequence
Enter AT<CR>
N
Delay 1s
– 5s
Y
Y
N
Y
Delay = 8 sec
N
Start AT CMD
AT Answer in
1sec?
Modem Reset Proc
N
Y