CN105301386B - OTG detection circuit and mobile terminal with it - Google Patents
OTG detection circuit and mobile terminal with it Download PDFInfo
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- CN105301386B CN105301386B CN201510613084.0A CN201510613084A CN105301386B CN 105301386 B CN105301386 B CN 105301386B CN 201510613084 A CN201510613084 A CN 201510613084A CN 105301386 B CN105301386 B CN 105301386B
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Abstract
The invention discloses a kind of OTG detection circuits comprising: test side, the test side is for connecting OTG equipment；Detection unit, the detection unit are connected with the test side, and the detection unit is used to generate detection voltage when the test side is connected with the OTG equipment；Comparator circuit, the input terminal of the comparator circuit are connected with the detection unit, and the comparator circuit is according to the detection voltage output comparison signal；The identification pin of detection chip, the detection chip is connected with the output end of the comparator circuit, and the detection chip identifies whether the test side is connected with the OTG equipment according to the comparison signal.OTG detection circuit of the invention identifies the insertion for having OTG equipment by increasing comparator circuit, substantially increases accuracy of identification.The invention also discloses a kind of mobile terminals with above-mentioned OTG detection circuit.
Description
Technical field
The present invention relates to mobile device technology, in particular to a kind of OTG (On-The-Go) detection circuit and one kind
Mobile terminal with the OTG detection circuit.
Background technique
In the related technology, mobile phone OTG detection circuit typically simply uses GPIO (the General Purpose of chip
Input Output, universal input/output) pin detected, relies solely on the level change that GPIO pin recognizes and come
Detect the insertion and extraction of OTG equipment.
Then, since the pull-up resistor of GPIO pin is larger, if GPIO pin has a micro- short resistance over the ground, hold very much
Misrecognition is easily led at the insertion of OTG equipment, and after the insertion for recognizing OTG equipment, just there is the voltage of 1.8V or so
It always exists, to provide electric field environment to electrochemical corrosion occurs in wet environment.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of OTG detection circuit, identifies the insertion for having OTG equipment by increasing comparator circuit, significantly
Improve accuracy of identification.
It is another object of the present invention to propose a kind of mobile terminal.
In order to achieve the above objectives, a kind of OTG detection circuit that the embodiment of the present invention proposes, comprising: test side, the detection
End is for connecting OTG equipment；Detection unit, the detection unit are connected with the test side, and the detection unit is used in institute
It states when test side is connected with the OTG equipment and generates detection voltage；Comparator circuit, the input terminal of the comparator circuit and institute
It states detection unit to be connected, the comparator circuit is according to the detection voltage output comparison signal；Detection chip, the detection core
The identification pin of piece is connected with the output end of the comparator circuit, and the detection chip is according to comparison signal identification
Whether test side is connected with the OTG equipment.
OTG detection circuit according to an embodiment of the present invention, by increasing comparator between detection unit and detection chip
Circuit comes whether recognition detection end is connected with OTG equipment, can not only reduce the voltage of identification pin, to slow down electrochemistry corruption
The speed of erosion can also substantially increase accuracy of identification as much as possible by OTG identification impedance adjustment to relatively low range.
According to one embodiment of present invention, the comparator circuit specifically includes: concatenated first resistor and the second electricity
Resistance, the concatenated first resistor and second resistance are connected between the first default power supply and ground, the concatenated first resistor
There is first node, input terminal of the first node as the comparator circuit between second resistance；Concatenated third
Resistance and the 4th resistance, the concatenated 3rd resistor and the 4th resistance are connected between the described first default power supply and ground, institute
Stating has second node between concatenated 3rd resistor and the 4th resistance；Comparator, the non-inverting input terminal of the comparator and institute
State first node be connected, the inverting input terminal of the comparator is connected with the second node, the power end of the comparator and
Second default power supply is connected, and the ground terminal ground connection of the comparator, the output end of the comparator is as the comparator circuit
Output end.
Also, the comparator circuit further includes the first electric capacity of voltage regulation, one end of first electric capacity of voltage regulation and described the
Two default power supplys are connected, the other end ground connection of first electric capacity of voltage regulation.
According to one embodiment of present invention, the output end of the comparator circuit also passes through pull-up resistor and first and presets
Power supply is connected.
According to one embodiment of present invention, the detection unit includes detection resistance, and the detection resistance is connected to institute
It states between test side and the input terminal of the comparator circuit.
Also, the OTG detection circuit further includes the second electric capacity of voltage regulation, one end of second electric capacity of voltage regulation with it is described
The input terminal of comparator circuit is connected, the other end ground connection of second electric capacity of voltage regulation.
In addition, the embodiment of the present invention also proposed a kind of mobile terminal comprising above-mentioned OTG detection circuit.
Mobile terminal according to an embodiment of the present invention identifies whether that being inserted into OTG sets by above-mentioned OTG detection circuit
Standby, the voltage that can not only reduce identification pin can also as much as possible identify OTG to slow down the speed of electrochemical corrosion
Impedance adjustment substantially increases accuracy of identification, sufficiently meets the needs of user to relatively low range.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the OTG detection circuit of one embodiment of the invention；And
Fig. 2 is the block diagram according to the mobile terminal of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
It is electric to describe the OTG detection circuit proposed according to embodiments of the present invention and there is the OTG to detect with reference to the accompanying drawings
The mobile terminal on road.
Fig. 1 is the schematic diagram according to the OTG detection circuit of one embodiment of the invention.As shown in Figure 1, OTG detection electricity
Road includes test side 10, detection unit 20, comparator circuit 30 and detection chip 40.
Wherein, such as USB_ID of test side 10 detects pin for connecting OTG equipment, detection unit 20 and 10 phase of test side
Even, detection unit 20 is used to generate detection voltage when test side is connected with OTG equipment.
According to one embodiment of present invention, as shown in Figure 1, detection unit 20 includes detection resistance R0, detection resistance connects
It connects between test side 10 and the input terminal of comparator circuit 30.Also, such as USB_ID detects pin connection in test side 10
When having OTG equipment, such as USB_ID of test side 10 detection pin is equivalent to over the ground, and detection unit 20 is on detection resistance R0 at this time
Form detection voltage.
The input terminal of comparator circuit 30 is connected with detection unit 20, and comparator circuit 30 is according to the detection voltage output
Identification pin, that is, GPIO pin of comparison signal, detection chip 40 is connected with the output end of comparator circuit 30, detection chip 40
OTG equipment whether is connected with according to comparison signal recognition detection end 10.In other words, detection chip 40 is identified according to comparison signal
It to when low and high level jump, can recognize to whether test side 10 is connected with OTG equipment, for example, detection chip 40 recognizes high electricity
When flat jump is low level, judgement has the insertion of OTG equipment, and detection chip 40 recognizes low level jump when being high level, sentences
Disconnected OTG equipment is extracted.
According to one embodiment of present invention, as shown in Figure 1, comparator circuit 30 specifically includes: concatenated first resistor
R1 and second resistance R2, concatenated 3rd resistor R3 and the 4th resistance R3, comparator Comp1.Wherein, concatenated first resistor R1
And second resistance R2 is connected between the power supply and ground of the first default power supply V1P8 such as 1.8V, concatenated first resistor R1 and
There is first node, input terminal of the first node as comparator circuit 30 between two resistance R2；Concatenated 3rd resistor R3 and
4th resistance R4 is connected between the first default power supply V1P8 and ground, is had between concatenated 3rd resistor R3 and the 4th resistance R4
Second node；The non-inverting input terminal (+) of comparator Comp1 is connected with first node, the inverting input terminal (-) of comparator Comp1
It is connected with second node, the power end of comparator Comp1 is connected with the power supply of the second default power supply V2P8 such as 2.8V, comparator
The ground terminal of Comp1 is grounded, output end of the output end of comparator Comp1 as comparator circuit 30, and exports comparison signal extremely
Identify pin GPIO.
Also, as shown in Figure 1, comparator circuit Comp1 further includes the first electric capacity of voltage regulation C1, the one of the first electric capacity of voltage regulation C1
End is connected with the second default power supply V2P8, the other end ground connection of the first electric capacity of voltage regulation C1, with so that the second default power supply V2P8
Output voltage stabilization.
Wherein, the ratio value of first resistor R1 and second resistance R2 are less than the ratio of 3rd resistor R3 and the 4th resistance R4
Value, and first resistor R1 to the 4th resistance R4 can be patch precision resistance.
In an embodiment of the present invention, compared with increasing between such as USB_ID pin of test side 10 and identification pin GPIO
Device circuit 30, and suitably divided by first resistor R1 and second resistance R2, so that can reach reduces test side voltage,
It is connected to the non-inverting input terminal of comparator simultaneously.And suitably divided by 3rd resistor R3 and the 4th resistance R4
Pressure, and the inverting input terminal for being connected to comparator can play the purpose for reducing identification voltage as reference input.Therefore
It says, the OTG detection circuit of the embodiment of the present invention is without changing original software logic, by adjusting the inverting input terminal of comparator
Reference voltage, so that it may by OTG identification impedance adjustment arrive very low range, guarantee identify accuracy.Also, in the present invention
A specific example in, identification impedance can be reduced to 300 ohms.
Specifically, as shown in Figure 1, the output end of comparator circuit 30 also passes through the default power supply of pull-up resistor RL and first
V1P8 is connected.By increasing comparator circuit 30 between such as USB_ID pin of test side 10 and identification pin GPIO, use
Comparator is compared judgement, so as to reduce identification pin voltage, so that recognizing the critical voltage of OTG equipment reduces,
Improve accuracy of identification.
According to one embodiment of present invention, as shown in Figure 1, above-mentioned OTG detection circuit further includes the second electric capacity of voltage regulation
One end of C2, the second electric capacity of voltage regulation C2 are connected with the input terminal of comparator circuit 30, the other end ground connection of the second electric capacity of voltage regulation C2,
To stable detection voltage, filtering interference signals improve detection accuracy.
In conclusion OTG detection circuit according to an embodiment of the present invention, by increasing between detection unit and detection chip
Add comparator circuit to come whether recognition detection end is connected with OTG equipment, the voltage of identification pin can be not only reduced, to slow down
OTG can also be identified that impedance adjustment to relatively low range, substantially increases identification essence as much as possible by the speed of electrochemical corrosion
Degree.
In addition, as shown in Fig. 2, the embodiment of the present invention also proposed a kind of mobile terminal 100 comprising above-mentioned OTG inspection
Slowdown monitoring circuit 200.
Wherein, mobile terminal can be the mobile devices such as mobile phone, plate.
Mobile terminal according to an embodiment of the present invention identifies whether that being inserted into OTG sets by above-mentioned OTG detection circuit
Standby, the voltage that can not only reduce identification pin can also as much as possible identify OTG to slow down the speed of electrochemical corrosion
Impedance adjustment substantially increases accuracy of identification, sufficiently meets the needs of user to relatively low range.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (6)
1. a kind of OTG detection circuit characterized by comprising
Test side, the test side is for connecting OTG equipment；
Detection unit, the detection unit are connected with the test side, and the detection unit in the test side for being connected with
Detection voltage is generated when the OTG equipment；
Comparator circuit, the input terminal of the comparator circuit are connected with the detection unit, and the comparator circuit is according to institute
State detection voltage output comparison signal, wherein the detection unit includes detection resistance, and the detection resistance is connected to the inspection
It surveys between end and the input terminal of the comparator circuit；
The identification pin of detection chip, the detection chip is connected with the output end of the comparator circuit, the detection chip
Identify whether the test side is connected with the OTG equipment according to the comparison signal, wherein the detection chip recognizes height
Level jump be low level when, judgement have OTG equipment insertion, the detection chip recognize low level jump be high level when,
Judge that OTG equipment is extracted.
2. OTG detection circuit according to claim 1, which is characterized in that the comparator circuit specifically includes:
Concatenated first resistor and second resistance, the concatenated first resistor and second resistance be connected to the first default power supply with
Between ground, there is first node, the first node is as the comparison between the concatenated first resistor and second resistance
The input terminal of device circuit；
Concatenated 3rd resistor and the 4th resistance, the concatenated 3rd resistor and the 4th resistance are connected to the described first default electricity
Between source and ground, there is second node between the concatenated 3rd resistor and the 4th resistance；
Comparator, the non-inverting input terminal of the comparator are connected with the first node, the inverting input terminal of the comparator with
The second node is connected, and the power end of the comparator is connected with the second default power supply, the ground terminal ground connection of the comparator, institute
State output end of the output end of comparator as the comparator circuit.
3. OTG detection circuit according to claim 2, which is characterized in that the comparator circuit further includes the first pressure stabilizing
Capacitor, one end of first electric capacity of voltage regulation are connected with the described second default power supply, another termination of first electric capacity of voltage regulation
Ground.
4. OTG detection circuit according to any one of claim 1-3, which is characterized in that the comparator circuit it is defeated
Outlet also passes through pull-up resistor and is connected with the first default power supply.
5. OTG detection circuit according to claim 3, which is characterized in that further include the second electric capacity of voltage regulation, described second is steady
One end of voltage capacitance is connected with the input terminal of the comparator circuit, the other end ground connection of second electric capacity of voltage regulation.
6. a kind of mobile terminal, which is characterized in that including OTG detection circuit according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510613084.0A CN105301386B (en) | 2015-09-23 | 2015-09-23 | OTG detection circuit and mobile terminal with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510613084.0A CN105301386B (en) | 2015-09-23 | 2015-09-23 | OTG detection circuit and mobile terminal with it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105301386A CN105301386A (en) | 2016-02-03 |
| CN105301386B true CN105301386B (en) | 2018-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510613084.0A Expired - Fee Related CN105301386B (en) | 2015-09-23 | 2015-09-23 | OTG detection circuit and mobile terminal with it |
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| CN (1) | CN105301386B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018094894A1 (en) * | 2016-11-23 | 2018-05-31 | 华为技术有限公司 | Detection circuit and detection method for on-the-go device, and terminal |
| CN106844265B (en) * | 2017-02-06 | 2018-10-19 | 维沃移动通信有限公司 | A kind of control method and mobile terminal of general-purpose serial bus USB interface |
| CN107391157B (en) * | 2017-07-31 | 2020-07-31 | 北京小米移动软件有限公司 | Mobile terminal and method for identifying mobile storage device |
| CN112397948A (en) * | 2019-08-13 | 2021-02-23 | 北京小米移动软件有限公司 | Female seat of Type-C, Type-C plug system and electronic system |
| CN110659237B (en) * | 2019-09-27 | 2022-12-09 | 闻泰通讯股份有限公司 | Function adaptation method, device, equipment and storage medium |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082139A (en) * | 2000-09-05 | 2002-03-22 | Advantest Corp | Power source voltage monitoring circuit |
| CN1774141A (en) * | 2004-11-08 | 2006-05-17 | 佛山市顺德区顺达电脑厂有限公司 | Detecting device for ear phone with speeking function and operating method thereof |
| CN100591080C (en) * | 2005-05-27 | 2010-02-17 | 佛山市顺德区顺达电脑厂有限公司 | Detecting method for earphone receiving/hang-up key |
| CN100589524C (en) * | 2006-07-06 | 2010-02-10 | 深圳Tcl新技术有限公司 | A device for detecting whether signal input device of TV is connected |
| CN201307924Y (en) * | 2008-11-14 | 2009-09-09 | 宇龙计算机通信科技(深圳)有限公司 | Earphone detecting circuit and terminal device using earphone detecting device |
| CN102915607A (en) * | 2011-08-05 | 2013-02-06 | 上海晨兴希姆通电子科技有限公司 | Headset anti-theft mobile terminal |
| CN103067601B (en) * | 2013-01-15 | 2015-02-11 | Tcl通讯（宁波）有限公司 | Mobile terminal and detecting method of earphone inserting state thereof |
| CN104714916B (en) * | 2015-03-30 | 2017-11-17 | 迈普通信技术股份有限公司 | USB interface external equipment inserts/transfer to detecting system |
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| CN105301386A (en) | 2016-02-03 |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523859 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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