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FIBOCOM_NL952-NA_Hardware_User_Manual
Page 24 of 57
response, the max t
sd
is 5s). In the finalization process, the module will save the network, SIM card and
some other parameters from memory, then clear the memory and shut down PMU. The software control
timing is shown in Figure 3-6:
+3.3V
PERST#
t
pd
RESET#
Module State
Finalization
Activation
FCPO#
t
off1
t
sd
OFF
AT+CFUN=0
t
off2
Figure 3-6 Software control power off timing
Index Min.
Recommended Max.
Comments
t
off1
TBD
TBD
-
RESET# should be asserted after PERST#
t
off2
TBD
TBD
-
FCPO# should be asserted after RESET#
t
pd
TBD
TBD
-
+3.3V power supply goes down time. If power supply is
always on, it can be ignored
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 Reset
The NL952 module can reset to its initial status by pulling down the RESET# signal for more than 2ms
(10ms is recommended), and module will restart after RESET# signal is released. When customer
executes RESET# function, the PMU remains its power inside the module. The recommended circuit
design is shown in the Figure 3-7: