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NCS2302 Datasheet(PDF) 7 Page - ON Semiconductor |
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NCS2302 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 8 page NCS2302 http://onsemi.com 7 TYPICAL CHARACTERISTICS Figure 9. High to Low Propagation to SE with Changing Input Overdrive of SE_DET PROPAGATION DELAY (ns) 700 400 300 200 100 0 −100 −0.1 0 0.1 0.3 0.4 0.5 0.7 0.8 0.2 0.6 INPUT OUTPUT 100 mV 50 mV 20 mV 10 mV VDD = 1.8 V VDD2 = 2.1 V RL = 1 MW CL = 15 pF TA = 25°C −0.5 0 0.5 1.5 2.0 2.5 3.5 4.0 1.0 3.0 500 600 APPLICATIONS INFORMATION Supply Voltages The NCS2302 works with a wide range of supply voltages. The main headset detection circuitry power supply can range from VDD = 1.6 V to 2.5 V. The send/end button press detection circuit can be powered from VDD2 = 1.6 to 2.8 V. VDD should be powered up before VDD2. The send/end detection comparator will not be functional unless VDD and VDD2 are both applied. VDD2 can be connected to VDD or to a separate supply voltage, such as the MIC bias voltage. Decoupling capacitors of 0.1 mF should be placed as close as possible to each power supply pin. Since the NCS2302 has built in latch−up immunity up to 800 mA, series resistors are not recommended on VDD or VDD2. Audio Jack Detection The NCS2302 is designed to simplify the detection of a stereo audio connector with a microphone contact. When the headset is not connected, the internal pull−up resistors on L_DET and GND_DET pull those pins high. When the headset is connected to the switched audio jack, the headset ground and left audio channel trigger L_DET and GND_DET to logic low. The NCS2302 can work with either the CTIA or OMTP standard. In order to support both standards simultaneously, a cross point switch and additional circuitry is necessary to detect and swap the ground and microphone pins. Send/End Button Press Detection A second integrated comparator allows the send/end signal to be compared with a reference voltage to detect whether the send/end button has been pressed. MIC Pin Biasing The typical application schematic in Figure 1 shows the recommended 2.2 k W pull−up resistor to the MIC bias voltage. The MIC bias voltage can exceed VDD and can go as high as 2.95 V. When the headset is not detected, the internal NMOS transistor is enabled to mute the MIC signal. In the typical application scenario with a 2.2 k W pull−up to a 2.1 V MIC bias voltage, the MIC pin is pulled to 1 mV when the headset is not present. The internal NMOS transistor is optimized to sink up to 2 mA of current, allowing some flexibility in the selection of the pull−up resistor and MIC bias voltage. |
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