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WM9711 Datasheet(PDF) 63 Page - Wolfson Microelectronics plc

Part # WM9711
Description  LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9711 Datasheet(HTML) 63 Page - Wolfson Microelectronics plc

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Production Data
WM9711L
w
PD Rev 4.1 April 2004
63
JACK INSERT DETECTION
The circuit diagram below shows how to detect when a headphone or headset has been plugged into
the headphone socket. It generates an interrupt, instructing the controller to enable HPOUTL and
HPOUTR and disable OUT3.
LR
switch closes
on insertion
-
-
HPOUTL
HPOUTR
GPIO
interrupt
logic
Figure 22 Jack Insert Detection Circuit
The circuit requires a headphone socket with a switch that closes on insertion. It detects both
headphones and phone headsets. Any GPIO pin can be used, provided that it is configured as an
input.
HOOKSWITCH DETECTION
The circuit diagram below shows how to detect when the “hookswitch” of a phone headset is pressed
(pressing the hookswitch is equivalent to lifting the receiver in a stationary telephone).
GPIO
interrupt
logic
MIC
LR
HOOK
SWITCH
47
-
-
HPOUTL
HPOUTR
MICL/MICR
AGND
680
Ω − 2.2kΩ
MICBIAS
PHONE HEADSET
WM9711L
Figure 23 Hookswitch Detection Circuit
The circuit uses a GPIO pin as a sense input. The impedance of the microphone and the resistor in
the MICBIAS path must be such that the potential at the GPIO pin is above 0.7
×DBVDD when the
hookswitch is open, and below 0.3
×DBVDD when it is closed.


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