Datasheet

ADAU1381

Rev. B | Page 66 of 84

Control

Bits[7:6], Speaker Output Gain Control

These bits control the gain of the speaker output. In general, this

parameter should be tuned at a system level, set once during system

initialization and not altered during operation of the system.

Bit 0, Speaker Output Enable

This bit enables the speaker output. It initiates the speaker power-

up and power-down sequences shown in Figure 36 and Figure 37.

Control

Bits[4:3], Detector Timeout

The timeout detector waits the specified amount of time for a

beep zero crossing before forcing the mute or unmute in the

playback path beep gains (that is, the left playback beep gain,

right playback beep gain, and mono playback beep gain).

Bit 0, Zero-Crossing Detector Enable

This bit enables the zero-crossing detector. Disabling the beep

zero-crossing detector may cause clicks and pops on the output

when using the beep path.

Table 53. Playback Speaker Output Control Register

Bits Description Default

[7:6] Speaker output gain control 00

00: 0 dB

01: 2 dB

10: 4 dB

11: 6 dB

[5:1] Reserved

0 Speaker output enable 0

0: disabled

1: enabled

Table 54. Beep Zero-Crossing Detector Control Register

Bits Description Default

[7:5] Reserved

[4:3] Detector timeout 11

00: 20 ms

01: 10 ms

10: 5 ms

11: 2.5 ms

[2:1] Reserved

0 Zero-crossing detector enable 1

0: disabled

1: enabled