STM32F302xx/STM32F303xx
Functional overview
TIM17 is used to provide the carrier frequency and TIM16 provides the main signal to be
sent. The infrared output signal is available on PB9 or PA13.
To generate the infrared remote control signals, TIM16 channel 1 and TIM17 channel 1 must
be properly configured to generate correct waveforms. All standard IR pulse modulation
modes can be obtained by programming the two timers output compare channels.
Figure 4.
Infrared transmitter
TIMER 16
(for envelop)
OC
PB9/PA13
TIMER 17
(for carrier)
OC
MS30365V1
3.25
Touch sensing controller (TSC)
The STM32F302xx/STM32F303xx 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.
Table 8.
Group
Capacitive sensing GPIOs available on STM32F302xx/STM32F303xx
devices
Capacitive sensing
signal name
Pin
name
Capacitive sensing
signal name
Pin
name
Group
TSC_G1_IO1
TSC_G1_IO2
TSC_G1_IO3
TSC_G1_IO4
TSC_G2_IO1
TSC_G2_IO2
TSC_G2_IO3
TSC_G2_IO4
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
TSC_G5_IO1
TSC_G5_IO2
TSC_G5_IO3
TSC_G5_IO4
TSC_G6_IO1
TSC_G6_IO2
TSC_G6_IO3
TSC_G6_IO4
PB3
PB4
1
2
5
PB6
PB7
PB11
PB12
PB13
PB14
6
Doc ID 023353 Rev 5
29/133
STMICROELECTRONICS [ ST ]
