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STM32L432KB 数据表(PDF) 33 Page - STMicroelectronics |
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STM32L432KB 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 149 page  DocID028798 Rev 2 33/149 STM32L432KB STM3L432KC Functional overview 45 The main features of the touch sensing controller are the following: • Proven and robust surface charge transfer acquisition principle • Supports up to 3 capacitive sensing channels • Up to 3 capacitive sensing channels can be acquired in parallel offering a very good response time • Spread spectrum feature to improve system robustness in noisy environments • Full hardware management of the charge transfer acquisition sequence • Programmable charge transfer frequency • Programmable sampling capacitor I/O pin • Programmable channel I/O pin • Programmable max count value to avoid long acquisition when a channel is faulty • Dedicated end of acquisition and max count error flags with interrupt capability • One sampling capacitor for up to 3 capacitive sensing channels to reduce the system components • Compatible with proximity, touchkey, linear and rotary touch sensor implementation • Designed to operate with STMTouch touch sensing firmware library Note: The number of capacitive sensing channels is dependent on the size of the packages and subject to I/O availability. 3.20 Random number generator (RNG) All devices embed an RNG that delivers 32-bit random numbers generated by an integrated analog circuit. 3.21 Timers and watchdogs The STM32L432xx includes one advanced control timers, up to five general-purpose timers, two basic timers, two low-power timers, two watchdog timers and a SysTick timer. The table below compares the features of the advanced control, general purpose and basic timers. Table 8. Timer feature comparison Timer type Timer Counter resolution Counter type Prescaler factor DMA request generation Capture/ compare channels Complementary outputs Advanced control TIM1 16-bit Up, down, Up/down Any integer between 1 and 65536 Yes 4 3 General- purpose TIM2 32-bit Up, down, Up/down Any integer between 1 and 65536 Yes 4 No General- purpose TIM15 16-bit Up Any integer between 1 and 65536 Yes 2 1 |
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