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FIBOCOM_NL952-NA_Hardware_User_Manual
Page 23 of 57
shown in Figure 3-5:
+3.3V
PERST#
t
pr
RESET#
t
on
1
Module State
Initialization
Activation(AT Command Ready)
FCPO#
t
on
2
typical 20s
OFF
Figure 3-5 Timing Control for Start-up
Index Min.
Recommended Max.
Comments
t
pr
0ms
-
-
The delay time of power supply rising from 0V up to 3.3V.If
power supply always ready, it can be ignored
t
on1
TBD
TBD
-
RESET# should be de-asserted after FCPO#
t
on2
TBD
TBD
-
The time delay of PERST# de-asserted after FCPO#,
PERST# must always be the last to get de-asserted
The minimum detection time of PCIe link is about
TBD
after PERST# de-asserted.
Note
:
When USB is used as data transfer interface, follow timing above in PERST# connecting with
host, otherwise don’t control PERST# in PERST# floating condition.
Module Shutdown
Module can be shut down by following control:
Shutdown Control Action
Condition
Software
Sending AT+CFUN=0 command
Normal shutdown(recommend)
Hardware
Pull down FCPO# pin
Only used when a hardware exception
occurs and the software control cannot be
used.
Module can be shut down by sending AT+CFUN=0 command. When the module receives the software
shutdown command, the module will start the finalization process (the reverse process of initialization),
and it will be completed after t
sd
time(t
sd
is the time wh
ich AP receive OK of “AT+CFUN=0”, if there is no