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STM32L162RCT6A Datasheet(PDF) 26 Page - STMicroelectronics |
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STM32L162RCT6A Datasheet(HTML) 26 Page - STMicroelectronics |
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26 / 128 page  Functional overview STM32L162xC/C-A 26/128 DocID026175 Rev 4 3.13 Ultra-low-power comparators and reference voltage The STM32L162xC/C-A devices embed two comparators sharing the same current bias and reference voltage. The reference voltage can be internal or external (coming from an I/O). • One comparator with fixed threshold • One comparator with rail-to-rail inputs, fast or slow mode. The threshold can be one of the following: – DAC output – External I/O – Internal reference voltage (VREFINT) or a sub-multiple (1/4, 1/2, 3/4) Both comparators can wake up from Stop mode, and be combined into a window comparator. The internal reference voltage is available externally via a low-power / low-current output buffer (driving current capability of 1 µA typical). 3.14 System configuration controller and routing interface The system configuration controller provides the capability to remap some alternate functions on different I/O ports. The highly flexible routing interface allows the application firmware to control the routing of different I/Os to the TIM2, TIM3 and TIM4 timer input captures. It also controls the routing of internal analog signals to ADC1, COMP1 and COMP2 and the internal reference voltage VREFINT. 3.15 Touch sensing The STM32L162xC/C-A devices provide a simple solution for adding capacitive sensing functionality to any application. These devices offer up to 23 capacitive sensing channels distributed over 10 analog I/O groups. Both software and timer capacitive sensing acquisition modes are supported. 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. The capacitive sensing acquisition only requires few external components to operate. This acquisition is managed directly by the GPIOs, timers and analog I/O groups (see Section 3.14: System configuration controller and routing interface). Reliable touch sensing functionality can be quickly and easily implemented using the free STM32L1xx STMTouch touch sensing firmware library. 3.16 AES The AES Hardware Accelerator can be used to encrypt and decrypt data using the AES |
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