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WM8962B Datasheet(PDF) 113 Page - Wolfson Microelectronics plc

Part # WM8962B
Description  Ultra-Low Power Stereo CODEC with Audio Enhancement DSP, 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers
PDF  295 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8962B Datasheet(HTML) 113 Page - Wolfson Microelectronics plc

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WM8962
Rev 4.3
113
DIGITAL BEEP GENERATOR
The WM8962 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, and is dependent on the SAMPLE_RATE_INT_MODE
and the SAMPLE_RATE settings
(see “Clocking and Sample Rates” section). 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 digital beep generator control fields are described in Table 68.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R110 (6Eh)
Beep
Generator (1)
7:4
BEEP_GAIN [3:0]
0000
Digital Beep Volume Control
0000 = mute
0001 = -90dB
0010 = -84dB
… (6dB steps)
1111 = -6dB
2:1
BEEP_RATE [1:0]
01
Digital Beep Waveform Control
If SAMPLE_RATE_INT_MODE = 1
00 = 500Hz
01 = 1000Hz
10 = 2000Hz
11 = 4000Hz
If SAMPLE_RATE_INT_MODE = 0
00 = 499Hz
– 502Hz
01 = 999Hz
– 1003Hz
10 = 1998Hz
– 2005Hz
11 = 3997Hz
– 4009Hz
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 68 Digital Beep Generator



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