WM8948 datasheet(52/189 Pages) WOLFSON

Part #	WM8948

Description	Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller

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Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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WM8948

Production Data

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PD, May 2011, Rev 4.1

52

DIGITAL BEEP GENERATOR

The WM8948 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 28.

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 28 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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WM8948 Datasheet(PDF) 52 Page - Wolfson Microelectronics plc

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