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STWBC2-HP датащи(PDF) 15 Page - STMicroelectronics |
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STWBC2-HP датащи(HTML) 15 Page - STMicroelectronics |
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15 / 96 page ![]() Figure 19. DC-DC buck monitor Table 9. DC-DC buck monitor operating parameters Parameter Value Division factor from VDD to ADC mux 2.86 LPF 10k Hz 2nd order 2.1.5 Analog demodulators 2.1.5.1 Voltage demodulator The voltage demodulator detects Rx modulation from the variation of the ringing node voltage. Figure 20. Voltage demodulator The ring voltage monitor cell provides the peak-to-peak of the probed voltage (see Ring voltage monitor (Ring_V)). It provides also a rectification of the ringing voltage. From SPI register, the FW can select on-the-fly the peak-to-peak or the rectified signal to be demodulated. The selected signal is directly filtered using a HPF and an LPF to select the band of the useful modulation. This filtered signal is shipped to ADC mux for STM32 acquisition through ADC. The signal is also sent to a comparator in order to provide a direct digital 1bit form of the modulation to an STM32 GPIO. Table 10. Voltage demodulator operating parameters Parameter Value Demodulation HPF 2nd order F0 adjustable by SPI registers to 300 Hz, 450 Hz, 600 Hz, 750 Hz Frequency tolerance +/-10% STWBC2-HP Analog AFE functions DS13825 - Rev 1.0 page 15/96 |
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