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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2744 датащи(PDF) 47 Page - STMicroelectronics |
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AN2744 датащи(HTML) 47 Page - STMicroelectronics |
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47 / 56 page  AN2744 Application ideas 47/56 7 Application ideas 7.1 Three-phase architecture The ST7538Q modem can be used to communicate on a three-phase network. A microcontroller should switch communication between the three phases, since the modem can transmit/receive over only one phase at a time. In the example scheme of Figure 47, the microcontroller uses three output lines as enable signals for three switches (typically opto-switches), one for each phase line. For the modem, there is no difference with respect to single-phase communication. 7.2 Received signal strength indication (RSSI) In many application fields, measuring the strength of the incoming signal is useful to: 1. evaluate the SNR (signal-to-noise ratio) at the node 2. choose the best routing through the network (if repeaters are allowed) A possible received signal strength indicator (RSSI) implementation is the one depicted in Figure 48 , where a peak detector is used to measure the amplitude of the incoming signal. Figure 47. Scheme of principle for three-phase architecture Ph1 Ph3 Ph2 Neutral T R µController ST7538 Enable Ph1 Enable Ph2 Enable Ph3 RAI Rx and TX Filters ATOP1 ATOP2 Ph1 Ph3 Ph2 Neutral T R µController ST7538 Enable Ph1 Enable Ph2 Enable Ph3 RAI Rx and TX Filters ATOP1 ATOP2 |
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