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8 / 65 page Block diagram STM8T143 8/65 DocID18315 Rev 6 2 Block diagram Figure 1. STM8T143 block diagram RC oscillator The 1-MHz RC oscillator is an internal fixed frequency oscillator used to supply the clock to the MCU system engine. Voltage regulator The voltage regulator has an internal comparison and feedback circuit that ensures the VREG voltage is kept stable and constant. The regulator requires an external smoothing capacitor. MCU system engine The MCU system engine controls the capacitive sensing engine and processes touch and proximity detection signals. Advanced ProxSense engine The advanced ProxSense engine circuitry uses a charge-transfer method to detect capacitance changes. It features: • An analog voltage comparator • A programmable internal sampling capacitor • A system that allows the ground parasitic capacitance to be compensated to improve the system sensitivity. This system is called electrode parasitic capacitance compensation (EPCC). |
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