QS8M
QFN Style Computer On Module
Advantages
Defined Return Path
The reason PCB layout becomes more and more important is
because of the trend to faster, higher integrated, smaller
formfactors, and lower power electronic circuits. The higher
the switching frequencies are, the more radiation may occur
on a PCB. With good layout, many EMI problems can be
minimized to meet the required specifications.
When a module or component is used in a design, the
supplier specifies the basis for such a layout. It‘s not only
the pinout which should lead to an easy wiring without the
need for crossings. He also has to provide a proper solution
for the signal path back to the module. If this return path,
mostly the ground plane, cannot be connected near the
signal pin, the return current has to take another way and
this may result in a loop area. The larger the area, the more
radiation and EMI problems may occur.
Ka-Ro QSCOM modules uses a large ground pad on the
bottom side. With this a defined ground plane connection is
available for all signals. In addition to have a good return
path for all signals this large ground pad can be used for
cooling.
Easy Wiring - Even 2-layer printed circuit
boards can be used.
With a solid ground plane on the bottom layer, high speed
signals can be routed on the top layer at a defined
impedance.
However, this is only possible if a peripheral or
plug can be connected directly without crossing other
routes.
Advanced Soldering
Using a large solder pad underneath the component has not
only electrical and thermal advantages. It is also used to
hold the component at a defined height during soldering,
without the solder being compressed by the weight of the
components, which could result in short circuits.
Standard Contact Assignments
Package Information
Ka-Ro electronics GmbH - Pascalstr. 22, D-52076 Aachen, Germany - Tel.: +49 2408 1402-0 (FAX -10)
www.karo-electronics.de
