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STM32F358XC bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện STM32F358XC
Giải thích chi tiết về linh kiện  Operating conditions
PDF  134 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM32F358XC bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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STM32F358xC
Functional overview
51
Figure 3. Infrared transmitter
3.25
Touch sensing controller (TSC)
The STM32F358xC devices provide a simple solution for adding capacitive sensing
functionality to any application. These devices offer up to 24 capacitive sensing channels
distributed over 8 analog I/O groups.
Capacitive sensing technology is able to detect the presence of a finger near a sensor which
is protected from direct touch by a dielectric (glass, plastic, ...). The capacitive variation
introduced by the finger (or any conductive object) is measured using a proven
implementation based on a surface charge transfer acquisition principle. It consists of
charging the sensor capacitance and then transferring a part of the accumulated charges
into a sampling capacitor until the voltage across this capacitor has reached a specific
threshold. To limit the CPU bandwidth usage this acquisition is directly managed by the
hardware touch sensing controller and only requires few external components to operate.
The touch sensing controller is fully supported by the STMTouch touch sensing firmware
library which is free to use and allows touch sensing functionality to be implemented reliably
in the end application.



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