STM32F358RCT7 datasheet(27/134 Pages) STMICROELECTRONICS

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STM32F358xC

Functional overview

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.

STM32F358RCT7 Datasheet(PDF) 27 Page - STMicroelectronics