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Hi,Customer wants to detect audio jack insertion with the following configuration.■4pin earphone jack "TIP pin"⇒Comparator IN / Comparator OUT⇒TS3A227E DET TRIGER pin
Customer's available earphonejack is a 4 pin product.For this reason, there is no switch for detecting jack insertion in the jack itself.
I got the following question from the customer.・Is there a problem by connecting the earphone jack tip pin directly to the input of the comparator?・Could you tell me the recommended comparator. Device image is below. datasheets.maximintegrated.com/.../MAX9060-MAX9064.pdfI look forward to hearing from you.Best Regards,Yusuke/Japan Disty
You cannot connect the DET_TRIGGER pin of the TS3A227E to a node that has audio signal like the tip pin. The DET_TRIGGER pin has an internal pull up resistor that would pull up the audio signal to VDD.
A comparator or any other GPIO can be used to control the DET_TRIGGER pin of the TS3A227E but it should not interfere with any audio signal on a tip pin.
If you use the audio jack connector below you could have the comparator connected to pin 5 so that when a headset is inserted the switch in the jack opens and allows Vdd to pull up the node above the threshold of the comparator to drive the DET_TRIGGER pin low.
The concern in this configuration is making sure the pull down resistor on pin 3 doesn’t interfere with the microphone signal bias.
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