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WM8955 датащи(PDF) 23 Page - Wolfson Microelectronics plc

номер детали WM8955
подробное описание детали  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955 датащи(HTML) 23 Page - Wolfson Microelectronics plc

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Product Preview
WM8955L
w
Product Preview Rev 0.4 May2003
23
LR
switch closes
on insertion
-
-
LOUT1
ROUT1
HPDETECT
headphone /
speaker
switching
47k
Ω /
100k
Ω
AVDD
HPSWEN = 1
HPSWPOL = 1
L/ROUT1 = L/ROUT2 = 1
Figure TBD Example Headset Detection circuit using normally-open switch
LR
switch opens
on insertion
-
-
LOUT1
ROUT1
HPDETECT
headphone /
speaker
switching
47k
Ω /
100k
Ω
AVDD
HPSWEN = 1
HPSWPOL = 0
L/ROUT1 = L/ROUT2 = 1
Figure TBD Example Headset Detection circuit using normally-closed switch
THERMAL SHUTDOWN
The speaker and headphone outputs can drive verylarge currents. To protect the WM8955L from
overheating, a thermal shutdown circuit is included. If the device temperature reaches approximately
150
0C and the thermal shutdown circuit is enabled (TSDEN = 1 ) then the speaker and headphone
amplifiers (outputs OUT1L/R, OUT2L/R & OUT3) will be disabled.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R23 (17h)
Additional (1)
8
TSDEN
0
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
Table 13 Thermal Shutdown



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