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WM9711 Datasheet(PDF) 63 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 63 Page - Wolfson Microelectronics plc |
63 / 66 page ![]() 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 Ω - - 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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