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FIBOCOM FM150-NA User Manual
Page 33 of 72
FM150 module uses PCIe interface, according to the PCIe specification, the PCIe Vmain should be used
as the +3.3V power source, not the Vaux. The Vaux is the PCIe backup power source and it is not sufficient
as the power supply. In addition, the external DC/DC power supply should not be used, because the
external power cannot control the module status through the PCIe protocol.
3.2.1 Power Supply
The FM150 module should be powered through the VCC pins, with the continuous current ability of
above 2.5A , and the power supply design is shown in Figure 3-2:
Figure 3-2 Power Supply Design
The filter capacitor design for power supply as shown in the following table:
Recommended
capacitance
Application
Description
220uF x 2
Voltage-stabilizing capacitors
Reduce power fluctuations of the module in
operation, requiring capacitors with low ESR.
LDO or DC/DC power supply requires the
capacitor of no less than 440uF.
The capacitor for battery power supply
can be reduced to 100~200uF.
1uF, 100nF
Digital signal noise
Filter out the interference generated from the
clock and digital signals.
39pF, 33pF
700/800, 850/900 MHz frequency
band
Filter out low frequency band RF interference