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FIBOCOM FM150-NA User Manual
Page 38 of 72
3.3 Control Signal
The FM150 module provides three control signals for power on/off and reset operations, the pin defined
as shown in the following table:
Pin
Pin Name
I/O
Reset Value Functions
Type
6
FULL_CARD_POWER
_OFF#
I
PU
Module power on/off input,
internal 20KΩ pull up
Power on: High/Floating
Power off: Low
3.3/1.8V
67
RESET#
I
PU
WWAN reset input, internal pull up,
active low
1.8V
50
PERST#
I
PD
Asserted to reset module.
Active low, internal pull up(10KΩ)
CMOS
3.3/1,8V
Note:
RESET # and PERST # need to be controlled by independent GPIO, and must not be shared
with other devices on the host. RESET # and PERST # are sensitive signals. PCB layout should
be far away from radio frequency interference. PCB traces need to be protected by grounding.
Do not route traces near the edges of PCBs. Coaxial modules are reset due to ESD problems.
3.3.1 Module Start-Up
3.3.1.1 Start-up Circuit
When the FULL_CARD_POWER_OFF# pin and RESET# pin are floating or connect to an external
3.3V/1.8V, the module will booting up. AP (Application Processor) controls the module start-up.
Recommended the FULL_CARD_POWER_OFF# and RESET# GPIO port should use a reset value is low
or pull down port and reserved external pull-down resistance. The circuit design is shown in Figure3-4:
Figure 3-4 Circuit for Module Start-up Controlled by AP