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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA311B датащи(PDF) 89 Page - STMicroelectronics |
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STA311B датащи(HTML) 89 Page - STMicroelectronics |
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89 / 102 page  DocID024340 Rev 1 89/102 STA311B Configuration registers (0x77; 0x78; 0x79) 102 9.5.7 Zero-mute threshold/hysteresis and RMS zero-mute selectors (0x6F) Zero-mute (0x6F) The STA311B implements an RMS-based zero-detect function (on serial input interface data) 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 will mute the output PWM when the input level become less than threshold - hysteresis. Once muted, the PWM will be unmuted when the input level is detected greater than threshold + hysteresis. The measured level is then reported (each input channel is selected by RMSZS[2:0] value) on registers 0x7A, 0x7B. Bit RW RST Name Description 7RW 0 Reserved 6RW 0 5RW 0 CHxHCT[5:0] see Table 21 4RW 1 3RW 1 2RW 0 1RW 1 0RW 1 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) & 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 |
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