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WM8946ECS/R Datasheet(PDF) 51 Page - Wolfson Microelectronics plc

Part # WM8946ECS/R
Description  Stereo Low-Power CODEC with Video Buffer
PDF  175 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8946ECS/R Datasheet(HTML) 51 Page - Wolfson Microelectronics plc

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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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