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STM32F372CB 数据表(PDF) 20 Page - STMicroelectronics |
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STM32F372CB 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 128 page  Functional overview STM32F37x 20/128 Doc ID 022691 Rev 3 3.16 Touch sensing controller (TSC) The devices provide a simple solution for adding capacitive sensing functionality to any application. 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. Up to 24 touch sensing electrodes can be controlled by the TSC. The touch sensing I/Os are organized in 8 acquisition groups, with up to 4 I/Os in each group. Table 3. Capacitive sensing GPIOs available on STM32F37x devices Group Capacitive sensing signal name Pin name Group Capacitive sensing signal name Pin name 1 TSC_G1_IO1 PA0 5 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 2 TSC_G2_IO1 PA4 6 TSC_G6_IO1 PB14 TSC_G2_IO2 PA5 TSC_G6_IO2 PB15 TSC_G2_IO3 PA6 TSC_G6_IO3 PD8 TSC_G2_IO4 PA7 TSC_G6_IO4 PD9 3 TSC_G3_IO1 PC4 7 TSC_G7_IO1 PE2 TSC_G3_IO2 PC5 TSC_G7_IO2 PE3 TSC_G3_IO3 PB0 TSC_G7_IO3 PE4 TSC_G3_IO4 PB1 TSC_G7_IO4 PE5 4 TSC_G4_IO1 PA9 8 TSC_G8_IO1 PD12 TSC_G4_IO2 PA10 TSC_G8_IO2 PD13 TSC_G4_IO3 PA13 TSC_G8_IO3 PD14 TSC_G4_IO4 PA14 TSC_G8_IO4 PD15 |
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