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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STWBC2-HP датащи(PDF) 16 Page - STMicroelectronics |
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STWBC2-HP датащи(HTML) 16 Page - STMicroelectronics |
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16 / 96 page  Parameter Value Demodulation LPF 3rd order F1 adjustable by SPI registers to 4k-Hz, 8k-Hz, 12k-Hz, 16k-Hz Frequency tolerance +/-10% Comparator hysteresis Adjustable by SPI registers 0, 0.6 mV, 1.2 mV, 2.4 mV 2.1.5.2 Current demodulator The current demodulator detects Rx modulation from the variation of the bridge current. Figure 21. Current demodulator The bridge current monitor provides a voltage image Bridge_I. As the current is sensed on the bridge supply, it is naturally rectified by the toggling of the driver. Hence, the image of the current can be directly filtered to retrieve the modulation. This signal is 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 pushed to a comparator in order to ship a direct digital 1bit form of the modulation to an STM32 GPIO. A configurable gain allows adapting the signal level to the filtering chain. Table 11. Current demodulator operating parameters Topic Value Demodulation HPF 2nd order F0 adjustable by SPI registers to 300 Hz, 450 Hz, 600 Hz, 750 Hz Frequency tolerance +/-10% Demodulation LPF 3rd order F1 adjustable by SPI registers to 4k Hz, 8k Hz, 12k Hz, 16k Hz Frequency tolerance +/-10% Comparator hysteresis Adjustable by SPI registers 0, 0.6 mV, 1.2 mV, 2.4 mV STWBC2-HP Analog AFE functions DS13825 - Rev 1.0 page 16/96 |
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