STM32L476RGT6STM32F767ZIT6
内容简介
Touch sensing controller (TSC)The STM32F071x8/xB devices provide a simple solution for adding capacitive sensingfunctionality to any application. These devices offer up to 24 capa...
- 型号：STM32F767ZIT6
- 供货量：99999PCS
- 品牌：st
- 发货地：广东深圳
- 发货期：1-3天
- 价格：￥13.2元/PCS
详细内容
Touch sensing controller (TSC)
The STM32F071x8/xB 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 based0n a surface charge transfer acquisition principle. It consists in
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 and0nly requires few external components to operate.
For operation,0ne capacitive sensing GPIO in each group is connected to an external
capacitor and cannot be used as effective touch sensing channel.
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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