WM8721L(2004) データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8721L Datasheet PDF : 37 Pages
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Production Data
WM8721 / WM8721L
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
0
8
LRHPBOTH 0
0000011
6:0
Right
Headphone
Out
RHPVOL[6:0]
1111001
( 0dB )
7
RZCEN
0
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[6:0] and LZCEN to
RHPVOL[6:0] 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[6:0] and RZCEN to
LHPVOL[6:0] 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
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PD Rev 4.0 November 2004
15
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