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WM9713 Datasheet(PDF) 105 Page - Wolfson Microelectronics plc |
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WM9713 Datasheet(HTML) 105 Page - Wolfson Microelectronics plc |
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105 / 111 page  Preliminary Technical Data WM9713L 1 PTD, March 2004, Rev 2.2 105 COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER Instead of a BTL ear speaker, a single-ended ear speaker can also be used, as shown below. Figure 39 Combined Headset / Single-ended Ear Speaker 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 HPL and HPR and disable OUT3. Figure 40 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 Alternatively a headphone socket with a switch that opens on insertion can be used. For this mode of operation the GPIO input must be inverted. 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). |
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