Hardware Interface Description - Wireless Data Modules

MC55/56 Hardware Interface Description
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6.2 Mounting MC55/56 onto the application platform
There are many ways to properly install MC55/56 in the host device. An efficient approach is
to mount the MC55/56 PCB to a frame, plate, rack or chassis.
Fasteners can be M1.6 or M1.8 screws plus suitable washers, circuit board spacers, or
customized screws, clamps, or brackets. Screws must be inserted with the screw head on
the bottom of the MC55/56 PCB. In addition, the board-to-board connection can also be
utilized to achieve better support.
Particular attention must be paid to the holes marked with an arrow in Figure 42. Both holes
are close to other components of MC55/56 and care must be taken to avoid contacting them.
For example, you can insert plastic screws and plastic washers, or fasteners small enough
not to protrude beyond the mounting areas specified in Figure 41.
Figure 42: Mounting holes on MC55/56
For proper grounding it is strongly recommended to use the ground plane on the back side in
addition to the five GND pins of the board-to-board connector. To avoid short circuits ensure
that the remaining sections of the MC55/56 PCB do not come into contact with the host
device since there are a number of test points. Figure 40 shows the positions of all test
points.
To prevent mechanical damage, be careful not to force, bend or twist the module. Be sure it
is positioned flat against the host device.
All the information you need to install an antenna is summarized in Chapter 4.1. Note that the
antenna pad on the bottom of the MC55/56 PCB must not be influenced by any other PCBs,
components or by the housing of the host device. It needs to be surrounded by a restricted
space as described in Chapter 4.1.
MC55/56_hd_v02.06 Page 96 of 105 29.10.2004