STM32F303C6 datasheet(28/115 Pages) STMICROELECTRONICS

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Functional overview

STM32F303x6/x8

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DocID025083 Rev 5

Figure 3. Infrared transmitter

3.18

Touch sensing controller (TSC)

The STM32F303x6/8 devices provide a simple solution for adding capacitive sensing

functionality to any application. These devices offer up to 18 capacitive sensing channels

distributed over 6 analog I/Os group.

Capacitive sensing technology is able to detect the presence of a finger near an electrode

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 electrode 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.

Table 10. Capacitive sensing GPIOs available on STM32F303x6/8 devices

Group

Capacitive sensing group name

Pin name

TSC_G1_IO1

PA0

TSC_G1_IO2

PA1

TSC_G1_IO3

PA2

TSC_G1_IO4

PA3

TSC_G2_IO1

PA4

TSC_G2_IO2

PA5

TSC_G2_IO3

PA6

TSC_G2_IO4

PA7

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