Datasheet

STM32F051x Functional overview
Doc ID 022265 Rev 3 19/105
components to operate. The STM32F051x devices offer up to 18 capacitive sensing
channels distributed over 6 analog I/O groups.
Table 5. Capacitive sensing GPIOs available on STM32F051x 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. No. of capacitive sensing channels available on STM32F051x devices
Analog I/O group
Number of capacitive sensing channels
STM32F051Rx STM32F051Cx
STM32F051Kx
(UFQFPN32)
STM32F051Kx
(LQFP32)
G13333
G23333
G33221
G43333
G53333
G63300
Number of capacitive
sensing channels
18 17 14 14