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AN2869 датащи(PDF) 28 Page - STMicroelectronics

номер детали AN2869
подробное описание детали  Guidelines for designing touch sensing applications
PDF  43 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2869 датащи(HTML) 28 Page - STMicroelectronics

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Surface electrode design
AN2869
28/43
Doc ID 15298 Rev 6
3.5.3
Using electrodes separated from the PCB
It is possible to use surface electrodes which create a sensitive area on the bottom surface
of the panel and are not close to the PCB.
One option is to print an electrode array on the inner surface of the front panel. In this case,
the electrode shape rules are as described in Chapter 3.1, and the materials are as
described in Chapter 2.2.2. The sensors can be connected using spring contacts,
conductive foam or rubber, or a flex tail attached using ACF/ACP (d)(see Figure 22).
Remember that, with this technique, the area where the interconnection is made is touch-
sensitive too.
Figure 22.
Printed electrode method showing several connection methods
d.
ACF/ACP = Anisotropic Conductive Film/Anisotropic Conductive Paste.
MS18979V1
Front panel
(plexiglass or
other suitable
material)
Controller
PCB
Spring
Printed
electrode
PCB pad
Flex PCB
Flex
connector
ACF/ACP
connection
Spacer (cylinder
of hard foam or
other suitable
material)
Printed
electrode
(optional)



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