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WM8955L
AVDD
/
HPSWEN = 1
HPSWPOL = 1
L/ROUT1 = L/ROUT2 = 1
-
-
ROUT1
LOUT1
L
R
47k
Ω
headphone /
speaker
switching
100k
Ω
HPDETECT
switch closes
on insertion
Figure TBD Example Headset Detection circuit using normally-open switch
AVDD
HPSWEN = 1
HPSWPOL = 0
L/ROUT1 = L/ROUT2 = 1
-
-
ROUT1
LOUT1
L
R
47k
Ω /
headphone /
speaker
switching
100k
Ω
switch opens
on insertion
HPDETECT
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
1500C 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
TSDEN
DEFAULT
DESCRIPTION
R23 (17h)
8
0
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
Additional (1)
Table 13 Thermal Shutdown
Product Preview Rev 0.4 May2003
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
