WM8971L データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8971L

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8971L

Advanced Information

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

registers are shown in Table 6

REGISTER

ADDRESS

R0 (00h)

Left Channel

PGA

BIT

8

LABEL

LIVU

7

LINMUTE

6

LZCEN

5:0

LINVOL

[5:0]

R1 (01h)

8

Right Channel

PGA

RIVU

7

RINMUTE

6

RZCEN

5:0

RINVOL

[5:0]

R23 (17h)

0

Additional

Control (1)

TOEN

Table 6 Input PGA Software Control

DEFAULT

DESCRIPTION

0

1

0

010111

( 0dB )

0

1

0

010111

( 0dB )

0

Left Volume Update

0 = Store LINVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (left = LINVOL, right =

intermediate latch)

Left Channel Input Analogue Mute

1 = Enable Mute

0 = Disable Mute

Note: LIVU must be set to un-mute.

Left Channel Zero Cross Detector

1 = Change gain on zero cross only

0 = Change gain immediately

Left Channel Input Volume Control

111111 = +30dB

111110 = +29.25dB

. . 0.75dB steps down to

000000 = -17.25dB

Right Volume Update

0 = Store RINVOL in intermediate

latch (no gain change)

1 = Update left and right channel

gains (right = RINVOL, left =

intermediate latch)

Right Channel Input Analogue Mute

1 = Enable Mute

0 = Disable Mute

Note: RIVU must be set to un-mute.

Right Channel Zero Cross Detector

1 = Change gain on zero cross only

0 = Change gain immediately

Right Channel Input Volume Control

111111 = +30dB

111110 = +29.25dB

. . 0.75dB steps down to

000000 = -17.25dB

Timeout Enable

0 : Timeout Disabled

1 : Timeout Enabled

w

AI Rev 3.0 March 2004

20

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