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WM8955LEFL Scheda tecnica(PDF) 22 Page - Wolfson Microelectronics plc

Il numero della parte WM8955LEFL
Spiegazioni elettronici  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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Produttore elettronici  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955LEFL Scheda tecnica(HTML) 22 Page - Wolfson Microelectronics plc

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WM8955L
Product Preview
w
Product Preview Rev 0.4 May2003
22
ANALOGUE OUTPUTS
ENABLING THE OUTPUTS
Each analogue output of the WM8955L can be separatelyenabled or disabled. The analogue mixer
associated with each output is powered on or off along with the output pin. All outputs are disabled by
default. To save power, unused outputs should remain disabled.
Outputs can be enabled at anytime, except when the WM8955L is in OFF mode, as this maycause
pop noise (see Minimising Pop Noise at the Analogue Outputs)
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8
LOUT1
0
LOUT1 Enable
7
ROUT1
0
ROUT1 Enable
5
LOUT2
0
LOUT2 Enable
4
ROUT2
0
ROUT2 Enable
2
MONO
0
MONOOUT Enable
R26 (1Ah)
Power
Management
(2)
1
OUT3
0
OUT3 Enable
Note: All “Enable” bits are 1 = ON, 0 = OFF
Table 10 Analogue Output Control
HEADPHONE SWITCH
The HPDETECT pin can be used as a headphone switch control input to automaticallydisable the
speaker output and enable the headphone output e.g. when a headphone is plugged into a jack
socket. In this mode, enabled bysetting 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
R24 (18h)
Additional (1)
5
HPSWPOL
0
Headphone Switch Polarity
0 : HPDETECT high = headphone
1 : HPDETECT high = speaker
Table 11 Headphone Switch
HPSWEN
HPSWPOL HPDETECT
(PIN23)
L/ROUT1
(reg. 26)
L/ROUT2
(reg. 26)
Headphone
enabled
Speaker
enabled
0X
X
0
0
no
no
0X
X
0
1
no
yes
0
X
X
1
0
yes
no
0
X
X
1
1
yes
yes
10
0
X
0
no
no
10
0
X
1
no
yes
10
1
0
X
no
no
1
0
1
1
X
yes
no
11
0
X
0
no
no
1
1
0
X
1
yes
no
11
1
0
X
no
no
11
1
1
X
no
yes
Table 12 Headphone Switch Operation



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