WM8946ECSSLASHR datasheet(51/175 Pages) WOLFSON

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Production Data

WM8946

PD, July 2012, Rev 4.3

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R37 (25h)

Beep Control

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]

Beep Waveform Control

00 = Reserved

01 = 1kHz

10 = 2kHz

11 = 4kHz

BEEP_ENA

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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