CN206686364U - Headset plugging detects circuit and electronic equipment - Google Patents
Headset plugging detects circuit and electronic equipment Download PDFInfo
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- CN206686364U CN206686364U CN201720297893.XU CN201720297893U CN206686364U CN 206686364 U CN206686364 U CN 206686364U CN 201720297893 U CN201720297893 U CN 201720297893U CN 206686364 U CN206686364 U CN 206686364U
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Abstract
The utility model embodiment discloses a kind of headset plugging detection circuit, including：Logic generation unit, interrupt detection unit, impedance detection unit and plug judging unit, the interruption detection unit is connected with the logic generation unit, the interruption detection unit detects interrupt signal caused by the logic generation unit, the impedance detection unit is connected with the logic generation unit, the impedance detection module detects the impedance data of the logic generation unit, the plug judging unit is connected to the interruption detection module and the impedance detection unit, the plug judge module judges headset plugging state according to the interrupt signal and the impedance data.The utility model embodiment also discloses a kind of corresponding electronic equipment.Headset plugging disclosed in the utility model embodiment detects circuit, is earphone insert state available for error detection after on the premise of the compatibility of peripheral hardware is not influenceed, solving the problems, such as earphone socket feed liquor, improves Consumer's Experience.
Description
Technical field
It the utility model is related to mobile communication technology field, more particularly to headset plugging detection circuit and electronic equipment.
Background technology
At present, the electronic equipment such as mobile phone, tablet personal computer is all equipped with earphone socket substantially, and earphone socket is based on 3.5mm,
Earphone socket set headset plugging detection means, after earphone insert, electronic equipment understand automatic identification to earphone insert and incite somebody to action in
Portion's voice-frequency channel is switched to headset mode and exported.In general, it is this be identified by it is open in usual inside earphone socket
Or the normally closed type switch interrupt signal caused by state change before and after earphone is inserted is realized.Referring to Fig. 1 to Fig. 2, with normal
Exemplified by the earphone socket of open switch：The first terminal S1 and Second terminal S02 form one group of switch, wherein, the first terminal S01 or
A connection left channel signals in Second terminal S02, another, which is only used as, detects pin, and the first terminal S1 and Second terminal
S02 connects pull-up resistor and pull down resistor respectively, and headset plug S03 is pluggable earphone plug, the right sound of third terminal S04 connections
Road signal, forth terminal S05 connection microphone signals, the 5th terminal S06 ground connection；When headset plug S03 is not inserted into earphone socket,
The first terminal S01 is to disconnect with Second terminal S02 contacts, and interrupt signal is high level；After headset plug S03 is inserted, the
One terminal S01 is produced with Second terminal S02 and electrically connected, i.e., short circuit occurs in the two, and interrupt signal is low level, and interrupt signal occurs
The change of level from high to low, it is thus regarded that earphone inserts, it is similar during extraction.Normally closed type switchs in contrast.
But for earphone socket open in usual, in order that power consumption is relatively low, the pull-up resistor of circuit is typically chosen higher by (hundreds of
More than k Ω), but a problem is similarly brought, can also even if impedance is not 0 between the first terminal S01 and Second terminal S02
Low level is obtained at interrupt signal, such as when selection 1m Ω pull-up resistors, the resistance between the first terminal S01 and Second terminal S02
It is anti-when reaching below 300k Ω, low level interrupt signal will be produced, so as to be judged as that earphone inserts.In actual use,
After earphone socket enters liquid (such as sweat), due to the effect of ionization, it is easy to reach between the first terminal S01 and Second terminal S02
To tens to hundreds of k Ω impedance, the time is longer, and impedance is smaller (sweat is non-volatile), thus, also can when earphone socket feed liquor
Error detection is earphone insert state, influences user experience.
Utility model content
The utility model embodiment provides headset plugging detection circuit and electronic equipment, is inserted with solving earphone in the prior art
The erroneous judgement problem of state is pulled out, is particularly due to erroneous judgement problem caused by earphone socket feed liquor.
On the one hand, the utility model embodiment provides a kind of headset plugging detection circuit, including：Logic generation unit, in
Disconnected detection unit, impedance detection unit and plug judging unit, the interruption detection unit are connected with the logic generation unit
Connect, the interruption detection unit detects interrupt signal caused by the logic generation unit, the impedance detection unit with it is described
Logic generation unit is connected, and the impedance detection module detects the impedance data of the logic generation unit, and the plug is sentenced
Disconnected unit is connected to the interruption detection module and the impedance detection unit, and the plug judge module is believed according to described interrupt
Number and the impedance data judge headset plugging state.
On the other hand, the utility model embodiment additionally provides a kind of electronic equipment, including above-mentioned headset plugging detection electricity
Road.
The headset plugging detection circuit that the utility model embodiment provides, by increasing impedance detection unit, plug judges
Module judges headset plugging state according to interrupt signal and impedance data.Thus, available for not influenceing the compatible of peripheral hardware
Under the premise of, error detection is earphone insert state after solving the problems, such as earphone socket feed liquor, improves Consumer's Experience.
Brief description of the drawings
, below will be to the utility model embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are only that this practicality is new
The accompanying drawing of some embodiments of type, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of earphone socket and headset plug in the state of extraction；
Fig. 2 is the structural representation of earphone socket and headset plug in insert state；
Fig. 3 is the structural representation of the first embodiment of the utility model headset plugging detection circuit；
Fig. 4 is the electrical schematic diagram of the second embodiment of the utility model headset plugging detection circuit；
Fig. 5 is the impedance detection oscillogram of the utility model headset plugging detection circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that described embodiment is the utility model part of the embodiment, rather than whole implementation
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment obtained, belong to the scope of the utility model protection.
First embodiment
As shown in figure 3, it is the structural representation of the first embodiment of the utility model headset plugging detection circuit.The earphone
Plug-pull detecting circuit is applied to electronic equipment, including：Logic generation unit, interrupt detection unit, impedance detection unit and plug
Judging unit, the interruption detection unit are connected with the logic generation unit, are patrolled described in the interruption detection unit detection
Interrupt signal caused by generation unit is collected, the impedance detection unit is connected with the logic generation unit, the impedance inspection
Survey the impedance data that module detects the logic generation unit, the plug judging unit be connected to the interruption detection module and
The impedance detection unit, the plug judge module judge headset plugging shape according to the interrupt signal and the impedance data
State.
In the utility model embodiment, the conduction impedance that is formed due to metallic plug and conducting liquid at detection switch
Difference, the former is about tens m Ω, the k Ω of the latter about tens, therefore can make differentiation by the size of conduction impedance.Wherein, logic
Generation unit can be based on left (right side) sound channel terminal and detection pin forms logic generation circuit, therefore terminal detection unit and impedance inspection
Survey unit is the independent detection unit based on the logic generation circuit, not only increases the accuracy that detection judges, it is ensured that
The compatibility of various insertion equipment.By contrast, some equipment is solve this problem, while increase impedance inspection on MIC signals
Survey and (after interrupt signal change is produced, while when impedance is less than certain value on MIC, just think that earphone is inserted to carry out dual judgement
Enter), but as the peripheral hardware species at earphone jack increases (card reader, self-shooting bar etc.), MIC impedance ranges are outside 0 Ω~∞
If existing, such a detection mode is unfavorable for the support of a variety of peripheral hardwares, and equipment compatibility is poor.
The headset plugging detection circuit that the utility model embodiment provides, by increasing impedance detection unit, plug judges
Module judges headset plugging state according to interrupt signal and impedance data.Thus, available for not influenceing the compatible of peripheral hardware
Under the premise of, error detection is earphone insert state after solving the problems, such as earphone socket feed liquor, improves Consumer's Experience.
Second embodiment
As shown in figure 4, it is the electrical schematic diagram of the second embodiment of the utility model headset plugging detection circuit.The earphone is inserted
Pull out detection circuit and be applied to electronic equipment, including：Logic generation unit, interruption detection unit, impedance detection unit and plug are sentenced
Disconnected unit, the interruption detection unit are connected with the logic generation unit, and the interruption detection unit detects the logic
Interrupt signal caused by generation unit, the impedance detection unit are connected with the logic generation unit, the impedance detection
Module detects the impedance data of the logic generation unit, and the plug judging unit is connected to the interruption detection module and institute
Impedance detection unit is stated, the plug judge module judges headset plugging shape according to the interrupt signal and the impedance data
State.
Specifically, the logic generation unit includes detection power supply V, pull-up resistor R1, the first detection pin S1, the second detection
Pin S2 and pull down resistor R2, the pull-up resistor R1 one end are connected to the detection power supply V, and the pull-up resistor R1's is another
One end that end is connected to the first detection pin S1, the pull down resistor R2 is connected to the second detection pin S2, the pull down resistor
R2 other end ground connection；It is described interrupt detection unit test point be located at the pull-up resistor R1 and pull down resistor R2 it
Between；The input of the impedance detection unit is connected to the detection power supply V, and the output end of the impedance detection unit is connected to
The first detection pin S1, the test side of the impedance detection unit is connected to the plug judging unit.
In the utility model embodiment, circuit can first determine whether interrupt signal meets in application, Ran Houtong
Impedance detection is crossed to further determine whether to insert or pull out for earphone.
Specifically, the value that the value of the pull-up resistor R1 is 1m Ω, the pull down resistor R2 is 10k Ω, the impedance inspection
Surveying unit includes variable current source A, and variable current source A can be used for the impedance number for detecting a points with output current and independent switch
According to acquiescence is to close, and can be opened after judging that interrupt signal is eligible.When insertion headset plug or enter conductive
During liquid, the first detection pin S1 and the second detection pin S2 short circuits, a level points are the pull down resistor of switch on-resistance and 10k Ω
Partial pressure value with 1m Ω pull-up resistor R1 again after R2 series connection, if this value judges low level higher than interrupting, earphone has been not considered as it
Insertion, if this value, which is less than to interrupt, judges low level, unlatching variable current source A, do impedance detection (original pull-up resistor is higher,
Electric current is smaller, can be ignored).
The electric current i of variable current source A outputs can flow through the switch conduction of the detection pin S2 compositions of the first detection pin S1 and second
Impedance Ron and 10k Ω pull down resistor R2, finally form voltage V in a points：
V=i × (Ron+R2)
After impedance detection unit detects this voltage V, conduction impedance Ron can be drawn by backwards calculation：
Ron=V ÷ i-R2.
One impedance thresholding Rth, such as 100 Ω are set, as Ron ＞ Rth, it is believed that the earless machine transplanting of rice in earphone socket
Head；As Ron ＜ Rth, it is believed that have headset plug in earphone socket.
Further, when being used in earphone socket open in usual, the first detection pin S1 and the second detection pin S2
Mutually from the variable current source A is provided with soft starting device under earphone extraction state.The soft starting device of power supply, it can control
Supply voltage gently, smoothly rises, and can avoid being produced impact due to larger dash current to circuit and being asked
Topic.Referring to Fig. 5, for the impedance detection oscillogram of the utility model headset plugging detection circuit, the soft of variable current source A is opened
The time that dynamic device carries out soft start includes 10ms-1000ms.Because switch open in usual is on L channel, the switch of current source
Small Dc bias can be formed in L channel, the precipitous meeting in edge causes to switch sound, and therefore, the switch of current source needs to adopt
With soft start, time t1 can be arranged to tens~hundreds of milliseconds according to demand, and t2 is the retention time, and ensure impedance detection can
By property,
The headset plugging detection circuit that the utility model embodiment provides, by the impedance ranges between identification switch, comes area
Divide feed liquor and the situation of earphone insertion so that headset detection is relatively reliable, and error detection is that earphone inserts after greatly reducing feed liquor
Cause the ratio that complete machine is noiseless.MIC is not used simultaneously as detection, does not have any influence on the compatibility of peripheral hardware, lifts user
Usage experience.
The embodiment for detecting circuit to headset plugging of the present utility model above is discussed in detail.It will correspond to below
The device (i.e. electronic equipment) for stating headset plugging detection circuit is further elaborated.Wherein, electronic equipment can be mobile phone, flat board
Computer or Intelligent worn device etc. have the terminal of earphone socket.
The utility model embodiment provides electronic equipment, employs the headset plugging detection circuit of above-described embodiment, passes through
Increase impedance detection unit, plug judge module judges headset plugging state according to interrupt signal and impedance data.Thus, can use
Error detection is earphone insert state after on the premise of the compatibility of peripheral hardware is not influenceed, solving the problems, such as earphone socket feed liquor,
Improve Consumer's Experience.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be wanted with right
The protection domain asked is defined.
Claims (8)
1. a kind of headset plugging detects circuit, including logic generation unit, it is characterised in that also includes interrupting detection unit, resistance
Anti- detection unit and plug judging unit, the interruption detection unit is connected with the logic generation unit, described to interrupt inspection
Survey unit and detect interrupt signal, the impedance detection unit and the logic generation unit phase caused by the logic generation unit
Connection, the impedance detection module detect the impedance data of the logic generation unit, and the plug judging unit is connected to institute
State and interrupt detection module and the impedance detection unit, the plug judge module is according to the interrupt signal and the impedance number
It is judged that headset plugging state.
2. headset plugging according to claim 1 detects circuit, it is characterised in that the logic generation unit includes detection
Power supply, pull-up resistor, the first detection pin, the second detection pin and pull down resistor, one end of the pull-up resistor are connected to the inspection
Power supply is surveyed, the other end of the pull-up resistor is connected to the first detection pin, and one end of the pull down resistor is connected to described second
Pin, the other end ground connection of the pull down resistor are detected, the input of the impedance detection unit is connected to the detection power supply, institute
The output end for stating impedance detection unit is connected to the first detection pin, and the test side of the impedance detection unit is connected to described
Plug judging unit.
3. headset plugging according to claim 2 detects circuit, it is characterised in that the impedance detection unit includes variable
Current source.
4. headset plugging according to claim 3 detects circuit, it is characterised in that the first detection pin and described second
Detection pin is separated under earphone extraction state, and the variable current source is provided with soft starting device.
5. headset plugging according to claim 4 detects circuit, it is characterised in that the soft start dress of the variable current source
Putting the time of progress soft start includes 10ms-1000ms.
6. headset plugging according to claim 2 detects circuit, it is characterised in that the test point for interrupting detection unit
Between the pull-up resistor and the pull down resistor.
7. headset plugging according to claim 2 detects circuit, it is characterised in that the value of the pull-up resistor is 1m Ω,
The value of the pull down resistor is 10k Ω.
8. a kind of electronic equipment, it is characterised in that detect circuit including the headset plugging described in claim any one of 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720297893.XU CN206686364U (en) | 2017-03-25 | 2017-03-25 | Headset plugging detects circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720297893.XU CN206686364U (en) | 2017-03-25 | 2017-03-25 | Headset plugging detects circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN206686364U true CN206686364U (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720297893.XU Active CN206686364U (en) | 2017-03-25 | 2017-03-25 | Headset plugging detects circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540903A (en) * | 2018-04-24 | 2018-09-14 | 华勤通讯技术有限公司 | A kind of volume amplification accessory, terminal, volume amplify accessory recognition methods |
-
2017
- 2017-03-25 CN CN201720297893.XU patent/CN206686364U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540903A (en) * | 2018-04-24 | 2018-09-14 | 华勤通讯技术有限公司 | A kind of volume amplification accessory, terminal, volume amplify accessory recognition methods |
| CN108540903B (en) * | 2018-04-24 | 2023-11-28 | 华勤技术股份有限公司 | Volume amplification accessory, terminal and volume amplification accessory identification method |
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