WM8750BL_12 Datasheet, PDF (35/60 Pages) Wolfson Microelectronics plc – Stereo CODEC for Portable Audio Applications

Production Data
REGISTER
ADDRESS
R24 (18h)
Additional
Control (2)
BIT
LABEL
6
HPSWEN
5
HPSWPOL
Table 32 Headphone Switch
DEFAULT
WM8750BL
DESCRIPTION
0
Headphone Switch Enable
0 : Headphone switch disabled
1 : Headphone switch enabled
0
Headphone Switch Polarity
0 : HPDETECT high = headphone
1 : HPDETECT high = speaker
Figure 11 Example Headset Detection Circuit Using Normally-Open Switch
Figure 12 Example Headset Detection Circuit Using Normally-Closed Switch
THERMAL SHUTDOWN
The speaker and headphone outputs can drive very large currents. To protect the WM8750BL from
overheating a thermal shutdown circuit is included. If the device temperature reaches approximately
150°C and the thermal shutdown circuit is enabled (TSDEN = 1 ) then the speaker and headphone
amplifiers (outputs OUT1L/R, OUT2L/R and OUT3) will be disabled.
REGISTER
ADDRESS
R23 (17h)
Additional
Control (1)
BIT
LABEL
8
TSDEN
Table 33 Thermal Shutdown
DEFAULT
DESCRIPTION
0
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
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PD, Rev 4.1, August 2012
35