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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM9712CLGEFL/V датащи(PDF) 75 Page - Wolfson Microelectronics plc |
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WM9712CLGEFL/V датащи(HTML) 75 Page - Wolfson Microelectronics plc |
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75 / 78 page  Production Data WM9712L w PD, Rev 4.6, November 2011 75 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 100k DBVDD Figure 30 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 2.2k MICBIAS PHONE HEADSET WM9712L Figure 31 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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