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.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.