WM8971L datasheet(21/61 Pages) WOLFSON

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Production Data

WM8971L

PD Rev 4.1 August 2005

The inputs can also be muted in the analogue domain under software control. The software control

registers are shown in Table 7. If zero crossing is enabled, it is necessary to enable zero cross

timeout to un-mute the input PGAs. This is because their outputs will not cross zero when muted.

Alternatively, zero cross can be disabled before sending the un-mute command.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LIVU

Left Volume Update

0 = Store LINVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = LINVOL, right =

intermediate latch)

LINMUTE

Left Channel Input Analogue Mute

1 = Enable Mute

0 = Disable Mute

Note: LIVU must be set to un-mute.

LZCEN

Left Channel Zero Cross Detector

1 = Change gain on zero cross only

0 = Change gain immediately

R0 (00h)

Left Channel

PGA

5:0

LINVOL

[5:0]

010111

( 0dB )

Left Channel Input Volume Control

111111 = +30dB

111110 = +29.25dB

. . 0.75dB steps down to

000000 = -17.25dB

RIVU

Right Volume Update

0 = Store RINVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (right = RINVOL, left =

intermediate latch)

RINMUTE

Right Channel Input Analogue Mute

1 = Enable Mute

0 = Disable Mute

Note: RIVU must be set to un-mute.

RZCEN

Right Channel Zero Cross Detector

1 = Change gain on zero cross only

0 = Change gain immediately

R1 (01h)

Right Channel

PGA

5:0

RINVOL

[5:0]

010111

( 0dB )

Right Channel Input Volume Control

111111 = +30dB

111110 = +29.25dB

. . 0.75dB steps down to

000000 = -17.25dB

R23 (17h)

Additional

Control (1)

TOEN

Timeout Enable

0 : Timeout Disabled

1 : Timeout Enabled

Table 7 Input PGA Software Control

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