Datasheet

Functional overview STM32F051x4 STM32F051x6 STM32F051x8
20/121 DocID022265 Rev 6
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 STM32F051xx devices
Group
Capacitive sensing
signal name
Pin
name
Group
Capacitive sensing
signal name
Pin
name
1
TSC_G1_IO1 PA0
4
TSC_G4_IO1 PA9
TSC_G1_IO2 PA1 TSC_G4_IO2 PA10
TSC_G1_IO3 PA2 TSC_G4_IO3 PA11
TSC_G1_IO4 PA3 TSC_G4_IO4 PA12
2
TSC_G2_IO1 PA4
5
TSC_G5_IO1 PB3
TSC_G2_IO2 PA5 TSC_G5_IO2 PB4
TSC_G2_IO3 PA6 TSC_G5_IO3 PB6
TSC_G2_IO4 PA7 TSC_G5_IO4 PB7
3
TSC_G3_IO1 PC5
6
TSC_G6_IO1 PB11
TSC_G3_IO2 PB0 TSC_G6_IO2 PB12
TSC_G3_IO3 PB1 TSC_G6_IO3 PB13
TSC_G3_IO4 PB2 TSC_G6_IO4 PB14
Table 6. Effective number of capacitive sensing channels on STM32F051xx
Analog I/O group
Number of capacitive sensing channels
STM32F051Rx STM32F051Cx STM32F051Tx
STM32F051KxU
(UFQFPN32)
STM32F051KxT
(LQFP32)
G1 33333
G2 33333
G3 32221
G4 33333
G5 33333
G6 33000
Number of capacitive
sensing channels
18 17 14 14 13
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.