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WM8750CLSEFL/R bảng dữ liệu(PDF) 37 Page - Wolfson Microelectronics plc

tên linh kiện WM8750CLSEFL/R
Giải thích chi tiết về linh kiện  Stereo CODEC for Portable Audio Applications
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Production Data
WM8750L
w
PD, Rev 4.4, August 2012
37
HEADPHONE SWITCH
The RINPUT3/HPDETECT pin can be used as a headphone switch control input to automatically
disable the speaker output and enable the headphone output e.g. when a headphone is plugged into
a jack socket. In this mode, enabled by setting HPSWEN, HPDETECT switches between headphone
and speaker outputs (e.g. when the pin is connected to a mechanical switch in the headphone socket
to detect plug-in). The HPSWPOL bit reverses the pin’s polarity. Note that the LOUT1, ROUT1,
LOUT2 and ROUT2 bits in register 26 must also be set for headphone and speaker output (see Table
31 and Table 32).
Note:
When RINPUT3/HPDETECT is used as the HPDETECT input, the thresholds become CMOS levels
(0.3 AVDD / 0.7 AVDD).
HPSWEN
HPSWPOL HPDETECT
(PIN23)
L/ROUT1
(reg. 26)
L/ROUT2
(reg. 26)
Headphone
enabled
Speaker
enabled
0
X
X
0
0
no
no
0
X
X
0
1
no
yes
0
X
X
1
0
yes
no
0
X
X
1
1
yes
yes
1
0
0
X
0
no
no
1
0
0
X
1
no
yes
1
0
1
0
X
no
no
1
0
1
1
X
yes
no
1
1
0
0
X
no
no
1
1
0
1
X
yes
no
1
1
1
X
0
no
no
1
1
1
X
1
no
yes
Table 31 Headphone Switch Operation
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R24 (18h)
Additional
Control (2)
6
HPSWEN
0
Headphone Switch Enable
0 : Headphone switch disabled
1 : Headphone switch enabled
5
HPSWPOL
0
Headphone Switch Polarity
0 : HPDETECT high = headphone
1 : HPDETECT high = speaker
Table 32 Headphone Switch
LR
switch opens
with insertion
-
-
LOUT1
ROUT1
HPDETECT
Headphone/
speaker
switching
33k
AVDD
HPSWEN = 1
HPSWPOL = 0
L/ROUT1 = L/ROUT2 = 1
Figure 11 Example Headset Detection Circuit Using Normally-Open Switch



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