CN202094975U

CN202094975U - Male joint low level detection circuit for earphone of cell phone

Info

Publication number: CN202094975U
Application number: CN2011202389020U
Authority: CN
Inventors: 刘立荣; 杨建成
Original assignee: Shenzhen Jinli Communication Equipment Co Ltd
Current assignee: Shenzhen Jinli Communication Equipment Co Ltd
Priority date: 2011-07-07
Filing date: 2011-07-07
Publication date: 2011-12-28
Anticipated expiration: 2021-07-07

Abstract

The utility model discloses a male joint low level detection circuit for the earphone of a cell phone. The male joint low level detection circuit comprises an earphone stand JK601 and a cell phone CPU. An earphone is connected with the cell phone CPU via the earphone stand JK601. The earphone stand JK601 is provided with a grounding pin GND, a microphone pin MIC, a right channel MP3R, a left channel MP3L and a signal detection pin. The signal detection pin is connected with the detection signal input terminal HEAD_DET of the cell phone CPU via a reserved resistor R63. The reserved resistor R63 is connected with a power supply via a current-limiting resistor. According to the utility model, the earphone male joint grounding, the MIC, the left channel and the right channel are adopted, and only the grounding segment can be utilized for conduction. Compared with the prior art, the male joint low level detection circuit of the utility model enables problems of impedance match and offset voltage to be solved with the help of male joint inserting detection. In addition, the detection pin is conducted by the male joint, so that dust and foreign materials are avoided, and the foreign materials can be wiped out through insertion of the male joint if the foreign materials are attached on an elastic sheet.

Description

Handset earphone male low level testing circuit

Technical field

The utility model relates to the handset earphone detection technique, particularly a kind of handset earphone male low level testing circuit.

Background technology

Along with the fast development of mobile communication technology, the use of mobile phone also more and more widely.Wherein the effect of the earphone jack on the mobile phone is: when earphone inserts, sound on the mobile phone is switched on the earphone, and how having judged whether that for mobile phone earphone inserts, it normally detects by interrupt signal, and interrupt signal is by the level sudden change and trigger.

At present handset earphone insert detect common level sudden change detection mode mainly comprise following several:

One, utilize earphone socket to detect the pin high level and detect, before the earphone male was inserted, the detection pin of earphone socket linked to each other with signal pins, detection signal is a low level, behind the insertion earphone, detects pin and signal pins and disconnects, detect pin and become high level, detect earphone and insert.Its schematic diagram is seen shown in Figure 1, and before the insertion earphone, 3 pin contact with 4 pin, and by the electric resistance partial pressure of 100K and 2K, this moment, Vdet was a low level, and after inserting earphone, 3 pin and 4 pin disconnect, and this moment, Vdet became high level, had detected the earphone insertion.Adopt this detection mode, need on the earphone socket to contact with one of them signal pins detecting pin, the earphone male flicks after inserting, the advantage of this detection mode is not influenced by external equipment, as long as male is inserted and can be detected, shortcoming is when having foreign material between detection pin and the signal pins, and the two can't conducting, system judges that earphone is in the insertion state, and this moment, the earphone symbol did not disappear.

Two, utilize the pull-up resistor low level to detect, its schematic diagram is seen shown in Figure 2, connects 100K resistance on signal pins, and detection signal is connected between resistance and the signal pins.Before inserting earphone, detection signal is a high level, and behind the insertion earphone, the receiver on pull-up resistor and the earphone forms the loop, and by the dividing potential drop effect of receiver 32 Europe impedances, the test point signal level is dragged down, and detects earphone and inserts.This detection mode the problems referred to above can not occur, but influenced by the external equipment resistance value, when external equipment (as active audio amplifier) impedance near or greater than 100K, dividing potential drop just can't realize dragging down the level effect, and with can have bias voltage on the signal pins that pull-up resistor links to each other always, can influence the life-span of music phone decoding chip.

Three, utilize earphone socket to detect the pin low level and detect, its schematic diagram is seen shown in Figure 3, and it is uncorrelated to do two independent detection pin and signal pins on earphone socket.Two detection pin separate (being commonly called as normal opening structure) at first, and one connects detection signal (putting high level earlier), a ground connection.Insert latter two pin of earphone and couple together, detection signal is dragged down, and judges that earphone inserts, and before the insertion earphone, 4 pin and 6 pin disconnect, and Vdet is a high level.After inserting earphone, 4 pin contact with 6 pin, form the loop, and Vdet becomes low level, detect earphone and insert.This mode advantage influences for not being subjected to external equipment, can detect as long as male is inserted, and earphone symbol problem also can not occur.Shortcoming is that the earphone socket volume is bigger, and versatility is not high, and earphone socket can can't recognize the insertion of earphone when detecting pin booty being arranged.

The utility model content

In view of above problem, the purpose of this utility model is to provide a kind of handset earphone male low level testing circuit.

For achieving the above object, the utility model is mainly by the following technical solutions:

A kind of handset earphone male low level testing circuit, comprise earphone stand JK601 and mobile phone CPU, earphone is connected with mobile phone CPU by earphone stand JK601, this earphone stand JK601 is provided with grounding leg GND, microphone pin MIC, R channel pin MP3R, L channel pin MP3L and input pin, described input pin is by reserving the detection signal input HEAD_DET that resistance R 63 is connected to mobile phone CPU, and reserves resistance R 63 and be connected to power supply by current-limiting resistance.

Wherein said R channel pin MP3R is connected to audio signal input end XMP3_R by the first filtering magnetic bead inductance B601.

Wherein said L channel pin MP3L is connected to audio signal input end XMP3_L by the second filtering magnetic bead inductance B602.

Wherein said microphone pin MIC is connected to microphone signal input XMIC by the 3rd filtering magnetic bead inductance B603.

Wherein said grounding leg GND one end is by the 4th filtering magnetic bead inductance B607 ground connection, and an end is connected to broadcast antenna FM_ANT.

The earphone male has ground, MIC, L channel and R channel four joints in the utility model, and can only utilize that joint of ground connection to realize conducting.Compared with prior art, the utility model inserts by male and detects, and has solved impedance matching and bias voltage problem; And, solved dust foreign material problem by male conduction detection pin, and invest on the shell fragment if any foreign material, by the insert action of male, can rub off foreign material.

Description of drawings

Fig. 1 detects the circuit theory diagrams that the pin high level detects for the existing earphone socket that utilizes.

Fig. 2 is the existing circuit theory diagrams that utilize the pull-up resistor low level to detect.

Fig. 3 detects the circuit theory diagrams that the pin low level detects for the existing earphone socket that utilizes.

The circuit theory diagrams that Fig. 4 utilizes the male low level to detect for the utility model.

The earphone interface schematic diagram that Fig. 5 adopts for the utility model.

Identifier declaration among the figure: ground connection 1, microphone 2, L channel 3, R channel 4.

Embodiment

For setting forth thought of the present utility model and purpose, the utility model is described further below in conjunction with the drawings and specific embodiments.

See also shown in Figure 4, the circuit theory diagrams that Fig. 4 utilizes the male low level to detect for the utility model.The utility model provides a kind of handset earphone male low level testing circuit, comprise earphone stand JK601 and mobile phone CPU, earphone is connected with mobile phone CPU by earphone stand JK601,1 pin on this earphone stand JK601 is that grounding leg GND, 2 pin are that microphone pin MIC, 3 pin are that R channel pin MP3R, 5 pin are that L channel pin MP3L, 4 pin are the input pin, described input pin is by reserving the detection signal input HEAD_DET that resistance R 63 is connected to mobile phone CPU, and reserves resistance R 63 and be connected to power supply by current-limiting resistance; Described R channel pin MP3R is connected to audio signal input end XMP3R by the first filtering magnetic bead inductance B601; Described L channel pin MP3L is connected to audio signal input end XMP3L by the second filtering magnetic bead inductance B602; Described microphone pin MIC is connected to microphone signal input XMIC by the 3rd filtering magnetic bead inductance B603; Described grounding leg GND one end is by the 4th filtering magnetic bead inductance B607 ground connection, and an end is connected to broadcast antenna FM_ANT.

As shown in Figure 5, Fig. 5 is the earphone interface schematic diagram of the utility model employing.This earphone male is provided with ground connection 1, microphone 2, L channel 3, R channel 4 four joint parts, and every joint is a becket.Ground connection 1 is received on lower margin GND and the detection signal pin simultaneously, realizes the conducting of these two pins, and microphone 2, L channel 3, R channel 4 correspondence respectively are connected to microphone pin MIC, L channel pin MP3L, R channel pin MP3R.

The detection signal input HEAD_DET of the utility model mobile phone CPU is used to detect the detection signal whether earphone has insertion, when the level sudden change takes place HEAD_DET, (become low level suddenly by high level, perhaps become high level suddenly by low level), CPU will detect earphone and insert.

The utility model circuit also is a principle of utilizing the level sudden change.Before earphone inserted, 1 pin and 4 pin of earphone stand JK601 disconnected, and do not form the loop on the circuit, and the two ends of 100K resistance do not have voltage difference, and HEAD DET is high level 2.8V.After earphone inserted, 1 pin and 4 pin were communicated with by the earphone male, because 1 pin is a ground connection, circuit has just formed a loop, and electric current is from power supply, and 1 pin, 4 pin and the B607 of process 100K resistance, earphone stand JK601 are to ground, HEAD_DET has become low level 0V, detects earphone and inserts.

More than be that a kind of handset earphone male low level testing circuit provided by the utility model is described in detail, used specific case herein structural principle of the present utility model and execution mode are set forth, above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims

1. handset earphone male low level testing circuit, comprise earphone stand JK601 and mobile phone CPU, earphone is connected with mobile phone CPU by earphone stand JK601, it is characterized in that this earphone stand JK601 is provided with grounding leg GND, microphone pin MIC, R channel pin MP3R, L channel pin MP3L and input pin, described input pin is by reserving the detection signal input HEAD_DET that resistance R 63 is connected to mobile phone CPU, and reserves resistance R 63 and be connected to power supply by current-limiting resistance.

2. handset earphone male low level testing circuit according to claim 1 is characterized in that described R channel pin MP3R is connected to audio signal input end XMP3_R by the first filtering magnetic bead inductance B601.

3. handset earphone male low level testing circuit according to claim 1 is characterized in that described L channel pin MP3L is connected to audio signal input end XMP3_L by the second filtering magnetic bead inductance B602.

4. handset earphone male low level testing circuit according to claim 1 is characterized in that described microphone pin MIC is connected to microphone signal input XMIC by the 3rd filtering magnetic bead inductance B603.

5. handset earphone male low level testing circuit according to claim 1 is characterized in that described grounding leg GND one end by the 4th filtering magnetic bead inductance B607 ground connection, and an end is connected to broadcast antenna FM_ANT.