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QST108 bảng dữ liệu(PDF) 29 Page - STMicroelectronics

tên linh kiện QST108
Giải thích chi tiết về linh kiện  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  51 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST108 bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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QST108
Design guidelines
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It is important to limit the amount of stray capacitance on the SNS terminals, for example by
minimizing trace lengths and widths to allow for higher gain without requiring higher values
of CS. Under heavy delta-CX loading of one key, cross coupling to another key’s trace can
cause the other key to trigger. Therefore, electrode traces from adjacent keys should not be
run close to each other over long runs in order to minimize cross-coupling if large values of
delta-CX are expected, for example when an electrode is directly touched. This is not a
problem when the electrodes are working through a plastic panel with normal touch
sensitivity.
For additional information on PCB layout and construction, please contact your local ST
Sales Office for a list of available application notes.



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