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WM8955LSEFL/R Datasheet(PDF) 25 Page - Wolfson Microelectronics plc

Part # WM8955LSEFL/R
Description  Stereo DAC For Portable Audio Applications
PDF  46 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955LSEFL/R Datasheet(HTML) 25 Page - Wolfson Microelectronics plc

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Production Data
WM8955L
w
PD Rev 4.2 March 2006
25
HEADPHONE SWITCH
The 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 (typically, the pin is connected to a mechanical switch in the headphone socket to
detect plug-in). The HPSWPOL bit reverses the pin’s polarity. HPDETECT has CMOS thresholds at
0.3 AVDD / 0.7 AVDD. Note that the LOUT1, ROUT1, LOUT2 and ROUT2 bits in register 26 must
also be set to enable headphone and speaker outputs (see tables below).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
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
R24 (18h)
Additional (1)
3
HPSWZC
0
Headphone Switch Zero Cross Enable
0 : Switch immediately
1 : Switch on zero crossing only
Table 14 Headphone Switch
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 15 Headphone Switch Operation
Figure 10 Example Headset Detection Circuit Using Normally-Open Switch
LR
switch opens
on 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-Closed Switch



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