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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA381BWS датащи(PDF) 159 Page - STMicroelectronics |
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STA381BWS датащи(HTML) 159 Page - STMicroelectronics |
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159 / 174 page  DocID018937 Rev 7 159/174 STA381BWS Register description: Sound Terminal compatibility The above thresholds and hysteresis table can be overridden and the low-level threshold and high-level threshold can be set by the MTH[21:0] bits. To activate the manual thresholds the FINETH bit has to be set to ‘1’. To configure the low threshold, the WTHL bit must be set to ‘1’ so that any write operation to the MTH bits will set the low threshold. To configure the low threshold, the WTHH bit must be set to ‘1’ so that any write operation to the MTH bits will set the low threshold. If the zero-mute block does not detect mute, it will mute the output when the current RMS value falls below the low threshold. If the zero-mute block does not detect mute, it will unmute the output when the current RMS value rises above the high threshold. Table 172. Zero-detect threshold ZMTH[2:0] Equivalent input level (dB) 000 -78 001 -84 010 -90 011 -96 100 -102 101 -108 110 -114 111 -114 Table 173. Zero-detect hysteresis HSEL[1:0] Equivalent input level hysteresis (dB) 00 3 01 4 10 5 11 6 Obsolete Product(s) - Obsolete Product(s) |
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