User's Manual

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FIBOCOM FM150-NA User Manual Page 55 of 75
 The SIM card slot with a metal shielding housing can improve the anti-interference ability.
 The trace length between the SIM card slot and the module should not exceed 100mm, or it could
reduce the signal quality.
 The UIM_CLK and UIM_DATA signal lines should be isolated by GND to avoid crosstalk interference.
If it is difficult for the layout, the whole SIM signal lines should be wrapped with GND as a group at
least.
 The filter capacitors and ESD devices for SIM card signals should be placed near to the SIM card slot,
and the ESD devices with 22~33pF capacitance should be used.
3.6 Status Indicator
The FM150 module provides two signals to indicate the operating status of the module, and the status
indicator pins as shown in the following table:
Pin Pin Name I/O Reset Value Pin Description Type
10 LED1# O T
System status LED, drain output.
CMOS 3.3V
23 WOWWAN# O PD
Module wakes up Host (AP), Reserved
CMOS 1.8V
3.6.1 LED1# Signal
The LED#1 signal is used to indicate the operating status of the module, and the detailed description as
shown in the following table:
Module Status LED1# Signal
RF function ON Low level (LED On)
RF function OFF High level (LED Off)
The LED driving circuit is shown in figure 3-19: