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STM32U073RCT6 Datasheet(PDF) 21 Page - STMicroelectronics |
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STM32U073RCT6 Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 146 page  The main features of the touch sensing controller are the following: • Charge transfer acquisition principle • Up to 21 capacitive sensing channels • Up to three capacitive sensing channels can be acquired in parallel offering a very good response time • Five selectable thresholds (VIH, VREF, 3/4 VREF, 1/2 VREF, 1/4 VREF) using the digital threshold or the ultra- low-power comparator • 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 three capacitive sensing channels to reduce the system components • Compatible with proximity, touchkey, linear and rotary touch sensor implementation • Designed to operate with the 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. 3.23 True random-number generator (RNG) The RNG is a true random number generator that provides full entropy outputs to the application as 32-bit samples. It is composed of a live entropy source (analog) and an internal conditioning component. 3.24 Timers and watchdogs The device includes an advanced-control timer, six general-purpose timers, two basic timers, three low-power timers, two watchdog timers and a SysTick timer. Table 7 compares features of the advanced-control, general- purpose and basic timers. Table 7. Timer feature comparison Timer type Timer Counter resolution Counter type Maximum operating frequency Prescaler factor DMA request generation Capture/ compare channels Compleme ntary outputs Advanced- control TIM1 16-bit Up, down, up/down 56 MHz Integer from 1 to 216 Yes 4 3 General -purpose TIM2 32-bit Up, down, up/down 56 MHz Integer from 1 to 216 Yes 4 - TIM3 16-bit Up, down, up/down 56 MHz Integer from 1 to 216 Yes 4 - TIM15 16-bit Up 56 MHz Integer from 1 to 216 Yes 2 1 TIM16 16-bit Up 56 MHz Integer from 1 to 216 Yes 1 1 Basic TIM6 and TIM7 16-bit Up 56 MHz Integer from 1 to 216 Yes - - Lower- power LPTIM1, LPTIM2, and LPTIM3 16-bit Up 56 MHz 2n where n = 0 to 7 No N/A - STM32U073x8/B/C Functional overview DS14548 - Rev 2 page 21/146 |
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