wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 113

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER
JACK INSERT DETECTION
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The ear speaker and the headset play the same signal. Whenever the headset is plugged in, the
headphone outputs are enabled and OUT3 disabled. When the headset is not plugged in, OUT3 is
enabled (see “Jack Insertion and Auto-Switching”)
Instead of a BTL ear speaker, a single-ended ear speaker can also be used, as shown below.
Figure 34 Combined Headset / Single-ended Ear Speaker
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 HPL and HPR
and disable OUT3.
Figure 35 Jack Insert Detection Circuit
The circuit requires a headphone socket with a switch that closes on insertion (for using sockets with
a switch that opens on insertion, please refer to Application Note WAN0182). It detects both
headphones and phone headsets. Any GPIO pin can be used, provided that it is configured as an
input.
PP, Rev 3.2, October 2008
WM9714L
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