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LOW-POWER ON CHIP HEADSET SWITCH DETECTION
LOW-POWER ON CHIP HEADSET SWITCH DETECTION
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机译:低功耗芯片耳机开关检测
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摘要
An integrated circuit within a cellular telephone has a wake mode and a sleep mode. In the wake mode, a voltage regulator supplies a regulated voltage onto a MIC BIAS terminal. This voltage biases a microphone of a headset/microphone accessory that is coupled to the cellular telephone. If the user presses a switch on the accessory, then a large current is drawn out of the MIC BIAS terminal. This switch press condition is detected by an ADC within the integrated circuit. In the sleep mode, the regulator and ADC are disabled to conserve power. A novel switch detect circuit supplies a current out of the MIC BIAS terminal at an unregulated voltage. If the user presses the switch, then the current supplied from the MIC BIAS terminal increases. T...
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机译:蜂窝电话内的集成电路具有唤醒模式和睡眠模式。在唤醒模式下,稳压器将稳定的电压提供给MIC BIAS端子。该电压使耦合到蜂窝电话的耳机/麦克风附件的麦克风偏置。如果用户按下附件上的开关,则会从MIC BIAS端子中抽出大电流。该开关按下条件由集成电路内的ADC检测到。在睡眠模式下,调节器和ADC被禁用以节省功耗。一种新颖的开关检测电路以未调节的电压从MIC BIAS端子提供电流。如果用户按下开关,则从MIC BIAS端子提供的电流会增加。 T ...
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