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WM8971L 데이터시트(PDF) 21 Page - Wolfson Microelectronics plc

부품명 WM8971L
상세설명  Stereo CODEC for Portable Audio Applications
PDF  61 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8971L 데이터시트(HTML) 21 Page - Wolfson Microelectronics plc

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Production Data
WM8971L
w
PD Rev 4.1 August 2005
21
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.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8
LIVU
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)
7
LINMUTE
1
Left Channel Input Analogue Mute
1 = Enable Mute
0 = Disable Mute
Note: LIVU must be set to un-mute.
6
LZCEN
0
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
8
RIVU
0
Right Volume Update
0 = Store RINVOL in intermediate
latch (no gain change)
1 = Update left and right channel
gains (right = RINVOL, left =
intermediate latch)
7
RINMUTE
1
Right Channel Input Analogue Mute
1 = Enable Mute
0 = Disable Mute
Note: RIVU must be set to un-mute.
6
RZCEN
0
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)
0
TOEN
0
Timeout Enable
0 : Timeout Disabled
1 : Timeout Enabled
Table 7 Input PGA Software Control



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