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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA321MPL1 датащи(PDF) 67 Page - STMicroelectronics |
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STA321MPL1 датащи(HTML) 67 Page - STMicroelectronics |
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67 / 80 page  DocID029389 Rev 1 67/80 STA321MPL1 Configuration registers (0x77; 0x78; 0x79) 80 6.5.8 Zero-mute threshold/hysteresis and RMS zero-mute selectors (0x6F) Zero-mute (0x6F) The STA321MPL1 implements an RMS-based zero-detect function (on serial input interface data) which is able to detect in a very reliable way the presence of an input signal, so that the power bridge outputs can be automatically connected to ground. When active, the function mutes the output PWM when the input level becomes less than the threshold - hysteresis. Once muted, the PWM “unmutes” when the input level is detected as greater than the threshold + hysteresis. The measured level is then reported (each input channel is selected by the RMSZS[2:0] value) on registers 0x7A and 0x7B. Table 15. RMS channel select D7 D6 D5 D4 D3 D2 D1 D0 RMSZS2 RMSZS1 RMSZS0 ZMTHS2 ZMTHS1 ZMTHS0 ZMHYS1 ZMHYS0 00 000 00 0 Bit RW RST Name Description 7 RW 0 RMSZS2 Select channel for reading the zero-mute RMS level on registers rmsZMH (0x7A) and rmsZML (0x7B). 6 RW 0 RMSZS1 5 RW 0 RMSZS0 4RW 0 ZMTHS2 Select the zero-mute threshold level. If signal is below this level, output will be in switch off mode. 3RW 0 ZMTHS1 2RW 0 ZMTHS1 1 RW 0 ZMHYS1 Select the hysteresis window width. 0 RW 0 ZMHYS0 RMSZS[2:0] Channel 000 1 001 2 010 3 011 4 100 5 101 6 110 7 111 8 |
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