STM32F091CB datasheet(20/127 Pages) STMICROELECTRONICS

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Functional overview

STM32F091xB STM32F091xC

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DocID026284 Rev 3

Both comparators can wake up from STOP mode, generate interrupts and breaks for the

timers and can be also combined into a window comparator.

3.13

Touch sensing controller (TSC)

The STM32F091xB/xC 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 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 and only requires few external components to operate.

For operation, one 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.

Table 5. Capacitive sensing GPIOs available on STM32F091xB/xC devices

Group

Capacitive sensing

signal name

name

Group

Capacitive sensing

signal name

name

TSC_G1_IO1

PA0

TSC_G5_IO1

PB3

TSC_G1_IO2

PA1

TSC_G5_IO2

PB4

TSC_G1_IO3

PA2

TSC_G5_IO3

PB6

TSC_G1_IO4

PA3

TSC_G5_IO4

PB7

TSC_G2_IO1

PA4

TSC_G6_IO1

PB11

TSC_G2_IO2

PA5

TSC_G6_IO2

PB12

TSC_G2_IO3

PA6

TSC_G6_IO3

PB13

TSC_G2_IO4

PA7

TSC_G6_IO4

PB14

TSC_G3_IO1

PC5

TSC_G7_IO1

PE2

TSC_G3_IO2

PB0

TSC_G7_IO2

PE3

TSC_G3_IO3

PB1

TSC_G7_IO3

PE4

TSC_G3_IO4

PB2

TSC_G7_IO4

PE5

TSC_G4_IO1

PA9

TSC_G8_IO1

PD12

TSC_G4_IO2

PA10

TSC_G8_IO2

PD13

TSC_G4_IO3

PA11

TSC_G8_IO3

PD14

TSC_G4_IO4

PA12

TSC_G8_IO4

PD15

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