3 Application Interface
Copyright © Fibocom Wireless Inc.
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3.3
Control Signal
The FM101 module provides two control signals for power on/off and reset operations. The
pin is defined in the following table:
Table 12. Control signal
Pin Pin Name
I/O
Reset Value Function
Level
6
FULL_CARD_POWER
_OFF#
DI
PU
Module power on/off input,
internal pull up (22KΩ)
Power on: High/Floating
Power off: Low
3.3/1.8V
67
RESET#
DI
PU
WWAN reset input, active low,
internal pull up (22KΩ)
1.8V
RESET# needs to be controlled by independent GPIO, and not shared with
other devices on the host. RESET# is sensitive signal, so it should be kept away
from RF interference and protected by ground. It should be neither near PCB
edge nor route on surface layer to avoid being reset abnormally caused by
ESD.
3.3.1
Module Start-Up
3.3.1.1
Start-up Circuit
The FCPO# (FULL_CARD_POWER_OFF #) pin needs an external 3.3V or 1.8V pull up for
booting up. AP (Application Processor) controls the module start-up. The recommended
design is using a default PD port to control FCPO#. It also should reserve a 100K
Ω(NC)
pull
down resistor on AP side. The circuit design is shown in Figure:
