CN212324136U - Simple functional mobile phone earphone compatible circuit - Google Patents
Simple functional mobile phone earphone compatible circuit Download PDFInfo
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- CN212324136U CN212324136U CN202021418645.4U CN202021418645U CN212324136U CN 212324136 U CN212324136 U CN 212324136U CN 202021418645 U CN202021418645 U CN 202021418645U CN 212324136 U CN212324136 U CN 212324136U
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- analog switch
- resistor
- compatible circuit
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Abstract
The utility model discloses a simple function cell-phone earphone compatible circuit, including earphone connector J8 and analog switch U3, earphone connector J8's foot 4 connecting resistance R67, resistance R64 and diode VR7, resistance R64's other end connecting resistance R67's the other end, diode D6's negative pole and analog switch U3's port A4, earphone connector J8's foot 1 connects diode VR8 and analog switch U3's port A1, inductance L13 and diode VR6 are connected to earphone connector J8's foot 3, inductance L13's other end connecting resistance R49 and resistance R31, the utility model discloses simple function cell-phone earphone compatible circuit effectively utilizes the method that simple analog switch and software control combine together to reach earphone compatible purpose to effectively utilize the ADC to detect voltage, thereby judge the earphone type.
Description
Technical Field
The utility model relates to an earphone technical field specifically is a simple function cell-phone earphone compatible circuit.
Background
At present, the price of the functional mobile phone is already low, and if a special chip is adopted to solve the problem of earphone compatibility, the cost is inevitably increased to cause the competitiveness of the mobile phone outlet of a company to be reduced.
There are two current definitions of 3.5mm binaural headphones. One is the OMTP definition, which is a national standard, and the headset is provided with a left channel at the forefront, a right channel, a microphone and a GND in sequence. Another CTIA definition is international standard, where the front end of the headset is the left channel, which in turn is the right channel, GND, microphone. That is to say the microphone and GND positions are reversed. If the mobile phone is not provided with a compatible circuit, the MIC sending function of the mobile phone is abnormal when the type of the inserted earphone is not supported by the mobile phone.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a simple function cell-phone earphone compatible circuit to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a simple compatible circuit of function cell-phone earphone, including earphone connector J and analog switch U, 4 connecting resistance R of foot of earphone connector J, resistance R and diode VR, resistance R's the other end connecting resistance R's the other end, diode D's negative pole and analog switch U's port A, diode VR and analog switch U's port A are connected to earphone connector J's foot 1, inductance L and diode VR are connected to earphone connector J's 3 feet, inductance L's other end connecting resistance R and resistance R, inductance L is connected to resistance R's the other end, inductance L's other end connecting resistance R and resistance R, inductance L is connected to analog switch U's port C, diode D's negative pole is connected to inductance L's the other end, inductance LC, electric capacity C and inductance C, diode D's positive pole connecting resistance R, resistance R and resistance R.
As a further technical solution of the present invention: the model of the analog switch U3 is SGM 4684.
As a further technical solution of the present invention: the diode D6 is a zener diode.
As a further technical solution of the present invention: the diode VR6 is a TVS diode.
As a further technical solution of the present invention: the diode VR7 is a TVS diode.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses simple function cell-phone earphone compatible circuit effectively utilizes simple analog switch and software control to combine together the way and reach earphone compatible purpose to effectively utilize the ADC to come detect voltage, thereby judge the earphone type.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, embodiment 1, a simple and functional mobile phone earphone compatible circuit includes an earphone connector J8 and an analog switch U3, a pin 4 of the earphone connector J8 is connected with a resistor R67, a resistor R64 and a diode VR7, the other end of the resistor R64 is connected with the other end of a resistor R67, the cathode of a diode D6 and a port A4 of an analog switch U3, a pin 1 of the earphone connector J8 is connected with a diode VR8 and a port a1 of an analog switch U3, a pin 3 of the earphone connector J8 is connected with an inductor L13 and a diode VR6, the other end of the inductor L13 is connected with a resistor R49 and a resistor R31, the other end of the resistor R31 is connected with an inductor L3, the other end of the inductor L3 is connected with a resistor R30 and a resistor R40, a port C3 of the analog switch U3 is connected with an inductor L10, the other end of the inductor L10 is connected with the cathode of a diode D10, an inductor LC 10, a capacitor C10 and an anode of the diode D10 is connected with a resistor R10.
As shown in FIG. 1, the analog switch U3 is used to connect MIC to J8_4 by default, and the OMTP-defined headset is supported by default. When an earphone is plugged into the mobile phone, the normally closed switch of the earphone connector is disconnected to generate an interrupt signal to trigger the response interrupt (EAR _ EINT) of the mobile phone. At this time, earphone type detection is started, and the earphone type is judged by detecting the voltage on the ADC AUX _ IN 4. If the inserted earphone is OMTP, the HEADSET _ L is 32 ohm connected to GND. The voltage detected at the ADC is 1.8V, which is obtained by dividing the voltage across the three resistors. The voltage of the ADC is about 0.9V, so that the current earphone type is judged to be the OMTP type, the analog switch keeps the original state and does not act, and the earphone can be normally used. On the contrary, if the inserted earphone is not of an OMTP type, the ADC cannot detect 0.9V, software sets the control port of the analog switch U3 to be at a high level, and the analog switch acts to change the MIC to be connected with J8_1, so that the MIC and the GND are exchanged on the PIN PIN of the earphone connector, and the normal function of the earphone is ensured.
Example 2: on the basis of embodiment 1, the model number of the analog switch U3 is SGM 4684. The diode D6 is a zener diode. Diode VR6 is a TVS diode. Diode VR7 is a TVS diode.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A simple functional mobile phone earphone compatible circuit comprises an earphone connector J8 and an analog switch U3, the earphone is characterized in that a pin 4 of the earphone connector J8 is connected with a resistor R67, a resistor R64 and a diode VR7, the other end of the resistor R64 is connected with the other end of a resistor R67, the cathode of a diode D6 and a port A4 of an analog switch U3, a pin 1 of the earphone connector J8 is connected with a diode VR8 and a port A1 of an analog switch U3, a pin 3 of the earphone connector J8 is connected with an inductor L13 and a diode VR6, the other end of the inductor L13 is connected with a resistor R49 and a resistor R31, the other end of the resistor R31 is connected with an inductor L3, the other end of the inductor L3 is connected with a resistor R30 and a resistor R40, a port C3 of the analog switch U3 is connected with an inductor L10, the other end of the inductor L10 is connected with the cathode of a diode D10, an inductor LC 10, a capacitor C10 and an inductor C10 and the anode of a resistor R10.
2. A simple, functional handset headset compatible circuit as claimed in claim 1 wherein said analog switch U3 is model SGM 4684.
3. A simple, functional handset headset compatible circuit according to claim 1, wherein the diode D6 is a zener diode.
4. The simple, functional handset headset compatible circuit of claim 1, wherein the diode VR6 is a TVS diode.
5. The simple, functional handset headset compatible circuit of claim 4, wherein the diode VR7 is a TVS diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021418645.4U CN212324136U (en) | 2020-07-17 | 2020-07-17 | Simple functional mobile phone earphone compatible circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021418645.4U CN212324136U (en) | 2020-07-17 | 2020-07-17 | Simple functional mobile phone earphone compatible circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212324136U true CN212324136U (en) | 2021-01-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021418645.4U Active CN212324136U (en) | 2020-07-17 | 2020-07-17 | Simple functional mobile phone earphone compatible circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212324136U (en) |
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2020
- 2020-07-17 CN CN202021418645.4U patent/CN212324136U/en active Active
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