Specifications

XT55 Hardware Interface Description
Confidential / Preliminary
s
mo b i l e
XT55_hd_v00.02 Page 109 of 116 17.03.2004
7.2 Mounting XT55 onto the application platform
There are many ways to properly install XT55 in the host device. An efficient approach is to
mount the XT55 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 XT55 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 52.
The two holes are close to other components of XT55 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 53.
In case you wish to connect the host device using the mounting hole enclosed by the dashed
line it is strongly recommended to use a plastic dowel according to Figure 55.
Figure 54: Mounting holes on XT55
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 XT55 PCB do not come into contact with the host device
since there are a number of test points. Figure 52 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 5. Note that the
antenna pad on the bottom of the XT55 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 5.1.2.