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FIBOCOM FM150-NA User Manual
Page 39 of 72
3.3.1.2 Start-up Timing Sequence
When power supply is ready, the PMU of module will power on and start initialization process by pulling
high both FCPO#(Pin6) and RESET#(Pin67) signal, After about 30s, the initialization process of the
module will be completed. The start-up timing is shown in Figure 3-5:
+3.8V
PERST#
t
pr
RESET#
t
on
1
Module State
Initialization
Activation(AT Command Ready)
FCPO#
t
on
2
typical 30s
OFF
Figure 3-5 Timing Control for Start-up
Notes:
1. When using PCIe as the data transmission interface, PERST # is connected to the host,
please refer to the control sequence in the figure above.
2. When using USB interface only, PERST # is left floating, ignore the control sequence in the
figure above about PERST #.
3.3.2 Module Shutdown
Module can be shut down by following control:
Shutdown Control Action
Condition
Sending AT+CPWROFF=0
command, and then Pull down
FCPO# pin
Normal run
Hardware
Pull down FCPO# pin
Fit for abnormal status, no response after
sent the AT+CPWROFF=0.
Index Min.
Recommended Max.
Comments
t
pr
0ms
-
-
The delay time of power supply rising from 0V up to
3.135V. If power supply always ready, it can be ignored.
t
on1
0ms
-
-
RESET# should be de-asserted after FCPO#.
t
on2
50ms
100ms
-
The time delay of PERST# de-asserted after FCPO#,
PERST# must always be the last to get de-asserted.
