WM8721(2000) Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
Número de pieza
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Fabricante
WM8721 Datasheet PDF : 34 Pages
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WM8721
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The software control is given in Table 4.
REGISTER
ADDRESS
0000010
Left
Headphone
Out
BIT
6:0
LABEL
LHPVOL[6:0]
DEFAULT
1111001
( 0dB )
7
LZCEN
1
8
LRHPBOTH 0
0000011
6:0
Right
Headphone
Out
RHPVOL[7:0]
1111001
( 0dB )
7
RZCEN
1
8
RLHPBOTH 0
Table 4 Headphone Output Software Control
DESCRIPTION
Left Channel Headphone Output
Volume Control
1111111 = +6dB
. . 1dB steps down to
0110000 = -73dB
0000000 to 0101111 = MUTE
Left Channel Zero Cross detect
Enable
1 = Enable
0 = Disable
Left to Right Channel Headphone
Volume, Mute and Zero Cross Data
Load Control
1 = Enable Simultaneous Load of
LHPVOL[7:0] and LZCEN to
RHPVOL[7:0] and RZCEN
0 = Disable Simultaneous Load
Right Channel Headphone Output
Volume Control
1111111 = +6dB
. . 1dB steps down to
0110000 = -73dB
0000000 to 0101111 = MUTE
Right Channel Zero Cross Detect
Enable
1 = Enable
0 = Disable
Right to Left Channel Headphone
Volume, Mute and Zero Cross Data
Load Control
1 = Enable Simultaneous Load of
RHPVOL[7:0] and RZCEN to
LHPVOL[7:0] and LZCEN
0 = Disable Simultaneous Load
The recommended external components required to complete the application are shown in Figure 11.
HPOUT
C1
R1
AGND
AGND
Figure 11 Headphone Output Application Drawing
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 November 2000
14
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