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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8946ECS/R датащи(PDF) 51 Page - Wolfson Microelectronics plc |
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WM8946ECS/R датащи(HTML) 51 Page - Wolfson Microelectronics plc |
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51 / 175 page  Production Data WM8946 w PD, July 2012, Rev 4.3 51 DIGITAL BEEP GENERATOR The WM8946 provides a digital signal generator which can be used to inject an audio tone (beep) into the DAC signal path. The output of the beep generator is digitally mixed with the DAC outputs, after the DAC digital volume. The beep is enabled using BEEP_ENA. The beep function creates an approximation of a Sine wave. The audio frequency is set using BEEP_RATE. The beep volume is set using BEEP_GAIN. Note that the volume of the digital beep generator is not affected by the DAC volume or DAC mute controls. The DAC_AUTOMUTE bit should not be set when the BEEP generator is used. The digital beep generator control fields are described in Table 29. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R37 (25h) Beep Control 1 6:3 BEEP_GAIN [3:0] 0000 Digital Beep Volume Control 0000 = mute 0001 = -83dB 0010 = -77dB … (6dB steps) 1111 = +1dB 2:1 BEEP_RATE [1:0] 01 Beep Waveform Control 00 = Reserved 01 = 1kHz 10 = 2kHz 11 = 4kHz 0 BEEP_ENA 0 Digital Beep Enable 0 = Disabled 1 = Enabled Note that the DAC and associated signal path needs to be enabled when using the digital beep. Table 29 Digital Beep Generator Note: The beep generator is clocked by the left channel DAC clock. If the beep signal is used on the right channel only, the left channel DAC must be enabled. |
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