User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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Figure 5 shows a flow chart for the proper power-up procedure:
Figure 5: Power-up Flow Chart
Modem ON Procedure
START
VBATT > 3.4V ?
VAUX/PWRMON = ON?
ON_OFF_N = LOW
80 ms < Hold Time < 120 ms
ON_OFF_N = HIGH
VAUX/PWRMON = ON?
Delay = 25 sec
Go to
Start AT CMD
Modem ON Procedure
END
N
Y
Y
N
Go to
HW SHUTDOWN
Unconditional
N
Y