CN104978300A - Mobile terminal as well as detecting method and device for connection of mobile terminal and external equipment - Google Patents

Abstract

The present invention relates to the technical field of mobile terminals. The present invention provides a mobile terminal and a detection method and device for connecting it with external equipment. The detection method includes the following steps: when the identification pin in the USB interface of the detection mobile terminal is triggered, send to The external device outputs an OTG identification signal, and judges whether it communicates with the external device within a predetermined time. When the external adapter is determined to be connected, the external adapter is charged to the mobile terminal. By judging that the communication with the OTG device fails in the case of a micro-short circuit within a predetermined time, the output of the identification signal is stopped to close the OTG detection function, thereby restoring the mobile terminal. The charging function avoids the defect that the USB interface of the mobile terminal cannot be charged when a micro-short circuit occurs.

Description

Mobile terminal and detection method and device for its connection with external equipment

technical field

The present invention relates to the technical field of mobile terminals, in particular to a mobile terminal and a detection method and device for connecting with external equipment.

Background technique

At present, more and more mobile phones have OTG function. Under normal circumstances, the detection of OTG devices by mobile phones is completed through the identification of identification pins and USB communication, so the charging function and OTG function can be accurately identified. However, due to the factors of the user's environment, such as in a humid environment or an environment that is prone to corrosion, a micro-short circuit will occur at the USB interface. At this time, there will be a failure to charge the mobile phone that supports OTG. Most of the current mobile phones have built-in batteries, so the inability to charge is a very serious problem for users. To sum up, in the prior art, there is a defect that the mobile terminal cannot be charged when a micro-short circuit occurs in the USB interface of the mobile terminal.

Contents of the invention

The purpose of the present invention is to provide a mobile terminal and a detection method and device for its connection with external equipment, aiming to solve the defect that the mobile terminal cannot be charged when there is a micro-short circuit in the USB interface of the mobile terminal in the prior art.

The present invention is achieved in this way. The first aspect provides a detection method for connecting a mobile terminal to an external device, and the detection method includes the following steps:

A. When detecting that the identification pin in the USB interface of the mobile terminal is triggered, output the OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time, yes, then perform step B, no, Then execute step C;

B. Recognize that the OTG device is connected to the USB interface, and communicate with the OTG device;

C. Stop outputting the OTG identification signal, and make the external adapter charge the mobile terminal when it is determined that the external adapter is connected.

With reference to the first aspect, in the first possible implementation of the first aspect, the step of detecting that the identification pin in the USB interface of the mobile terminal is triggered in the step A is specifically:

When it is detected whether the identification pin is input with a low potential, it is determined that the identification pin is triggered.

In combination with the first aspect, in the second possible implementation of the first aspect, the step of sending an OTG identification signal to the external device and judging whether to communicate with the external device within the predetermined time in the step A is specifically:

Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time.

With reference to the first aspect, in the third possible implementation of the first aspect, the step of determining the access of the external adapter in the step C is specifically:

When it is detected that the positive differential signal pin and the negative differential signal pin are short-circuited, it is determined that the external adapter is connected.

The second aspect of the present invention provides a detection device for connecting a mobile terminal to an external device, the detection device includes a detection unit and a control unit;

The detection unit is configured to output a detection signal to the control unit when detecting that the identification pin in the USB interface of the mobile terminal is triggered;

The control unit is used to output an OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time. The device communicates, and when the judgment result is negative, it stops outputting the OTG identification signal, and makes the external adapter charge the mobile terminal when it is judged that the external adapter is connected.

With reference to the second aspect, in the first possible implementation of the second aspect, the detection unit in the step A detects that the identification pin in the USB interface of the mobile terminal is triggered:

When it is detected that the identification pin inputs a low potential, it is determined that the identification pin is triggered.

With reference to the second aspect, in the second possible implementation of the second aspect, the process of the control unit sending an OTG identification signal to the external device and judging whether to communicate with the external device within a predetermined time is as follows:

Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the control unit is further configured to determine that an external adapter is connected when it detects that the positive differential signal pin and the negative differential signal pin are short-circuited.

A third aspect of the present invention provides a mobile terminal, including the device for detecting the connection between the mobile terminal and the external device described in the second aspect and a USB interface.

The present invention provides a mobile terminal and a detection method and device for its connection with external equipment. By judging within a predetermined time that the communication with the OTG equipment fails in the case of a micro-short circuit, the output of the identification signal is stopped to close the OTG detection function, thereby The charging function of the mobile terminal is restored, and the defect of being unable to charge when a micro-short circuit occurs at the USB interface of the mobile terminal is avoided.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a flow chart of a method for detecting a connection between a mobile terminal and an external device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an apparatus for detecting a connection between a mobile terminal and an external device according to another embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

An embodiment of the present invention provides a detection method for connecting a mobile terminal to an external device. As shown in FIG. 1, the detection method includes the following steps:

Step S101. When detecting that the identification pin in the USB interface of the mobile terminal is triggered, output the OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time, if yes, then execute step S102, if not , execute step S103.

In the step S101, the step of detecting that the identification pin in the USB interface of the mobile terminal is triggered is specifically:

When it is detected whether the identification pin is input with a low potential, it is determined that the identification pin is triggered.

The step of sending an OTG identification signal to the external device and judging whether to communicate with the external device within a predetermined time is specifically as follows in the step S101:

Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time.

Specifically, when a micro-short circuit occurs on the USB interface, since the impedance of the ID pin to ground is normally 1.5M, the resistance of the micro-short circuit is between 100 and 10Kohm, and the resistance that the circuit recognizes as OTG usually ranges from 0 to 180K. , therefore, at this time the system will output 5v power to communicate with the OTG device. When the charger is plugged in, because the mobile terminal is the OTG master device, the USB communication protocol with the adapter cannot be completed, and the system will judge that the device inserted is a non-OTG device.

Step S102. Identify that the OTG device is connected to the USB interface, and communicate with the OTG device.

Step S103. Stop outputting the OTG identification signal, and enable the external adapter to charge the mobile terminal when it is determined that the external adapter is connected.

In this step, specifically, the 5v power output enable of the OTG device is turned off, so that the entire system restores the charging path.

In this step, specifically, the step of determining the access of the external adapter is specifically:

When it is detected that the positive differential signal pin and the negative differential signal pin are short-circuited, it is determined that the external adapter is connected.

Further, the mobile terminal obtains voltage information of an external adapter connected to the mobile terminal; the mobile terminal compares the received voltage information with a standard voltage range, and if the voltage information is within the standard voltage range, Then it can be identified that the USB adapter is a USB adapter that matches the handset, otherwise, it is identified that the adapter is not a USB adapter that matches the mobile terminal, when the adapter is not a USB adapter that matches the mobile terminal When using a matching USB adapter, convert the input voltage to a standard voltage before charging.

Another embodiment of the present invention provides a detection device for connecting a mobile terminal to an external device, the detection device includes a detection unit 201 and a control unit 202;

The detection unit 201 is configured to output a detection signal to the control unit 202 when detecting that the identification pin in the USB interface of the mobile terminal is triggered;

The control unit 202 is used to output an OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time, and when the judgment result is yes, identify that the OTG device is connected to the USB interface, and communicate with the The OTG device communicates, and when the judgment result is negative, stops outputting the OTG identification signal, and makes the external adapter charge the mobile terminal when it is judged that the external adapter is connected.

Specifically, when a micro-short circuit occurs on the USB interface, since the impedance of the ID pin to ground is normally 1.5M, the resistance of the micro-short circuit is between 100 and 10Kohm, and the resistance that the circuit recognizes as OTG usually ranges from 0 to 180K. , therefore, at this time the system will output 5v power to communicate with the OTG device. When the charger is plugged in, because the mobile terminal is an OTG master device, it cannot complete the USB communication protocol with the adapter. At this time, the system will judge that the inserted device is a non-OTG device, and realize the charging function of the mobile terminal by stopping the output of the OTG identification signal.

The process that the detection unit 201 detects that the identification pin in the USB interface of the mobile terminal is triggered is:

When it is detected that the identification pin inputs a low potential, it is determined that the identification pin is triggered.

The process of the control unit 202 sending an OTG identification signal to the external device and judging whether to communicate with the external device within a predetermined time is as follows:

Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time.

The control unit 202 is further configured to determine that an external adapter is connected when it detects that the positive differential signal pin and the negative differential signal pin are short-circuited.

Further, the control unit in the mobile terminal obtains the voltage information of the external adapter connected to the mobile terminal; the mobile terminal compares the received voltage information with the standard voltage range, if the voltage information is within the standard voltage range within the voltage range, it can be identified that the USB adapter is a USB adapter that matches the handset; otherwise, it is identified that the adapter is not a USB adapter that matches the mobile terminal. When using a USB adapter matching the above-mentioned mobile terminal, the drive transformer module converts the input voltage into a standard voltage before charging.

Another embodiment of the present invention provides a mobile terminal, including the above-mentioned device for detecting the connection between the mobile terminal and an external device and a USB interface.

The present invention provides a mobile terminal and a detection method and device for its connection with external equipment. By judging within a predetermined time that the communication with the OTG equipment fails in the case of a micro-short circuit, the output of the identification signal is stopped to close the OTG detection function, thereby The charging function of the mobile terminal is restored, and the defect of being unable to charge when a micro-short circuit occurs at the USB interface of the mobile terminal is avoided.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, several equivalent substitutions or obvious modifications are made without departing from the concept of the present invention, and the performance or use is the same, all should be regarded as belonging to the present invention by the submitted claims The scope of patent protection determined by the book.

Claims (9)

1. a detection method that a mobile terminal is connected with an external device, it is characterized in that, the detection method comprises the following steps: A. When detecting that the identification pin in the USB interface of the mobile terminal is triggered, output the OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time, yes, then perform step B, no, Then execute step C; B. Recognize that the OTG device is connected to the USB interface, and communicate with the OTG device; C. Stop outputting the OTG identification signal, and make the external adapter charge the mobile terminal when it is determined that the external adapter is connected. 2. The detection method according to claim 1, wherein the step of detecting that the identification pin in the USB interface of the mobile terminal is triggered in the step A is specifically: When it is detected whether the identification pin is input with a low potential, it is determined that the identification pin is triggered. 3. detection method as claimed in claim 1, is characterized in that, the step described in described step A sends OTG identification signal to external equipment and judges whether to communicate with external equipment within a predetermined time is specifically: Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time. 4. The detection method according to claim 1, wherein the step of determining the access of the external adapter in the step C is specifically: When it is detected that the positive differential signal pin and the negative differential signal pin are short-circuited, it is determined that the external adapter is connected. 5. A detection device for connecting a mobile terminal to an external device, characterized in that the detection device includes a detection unit and a control unit; The detection unit is configured to output a detection signal to the control unit when detecting that the identification pin in the USB interface of the mobile terminal is triggered; The control unit is used to output an OTG identification signal to the external device, and judge whether to communicate with the external device within a predetermined time. The device communicates, and when the judgment result is negative, it stops outputting the OTG identification signal, and makes the external adapter charge the mobile terminal when it is judged that the external adapter is connected. 6. The detection device according to claim 5, wherein the process in which the detection unit detects that the identification pin in the USB interface of the mobile terminal is triggered in the step A is: When it is detected that the identification pin inputs a low potential, it is determined that the identification pin is triggered. 7. The detection device according to claim 5, wherein the process of the control unit sending an OTG identification signal to the external device and judging whether to communicate with the external device within a predetermined time is: Output the power supply voltage to the external device, and judge whether to complete the USB communication protocol with the external device within a predetermined time. 8. The detection device according to claim 5, wherein the control unit is further configured to determine that an external adapter is connected when it detects that the positive differential signal pin and the negative differential signal pin are short-circuited. 9. A mobile terminal, characterized by comprising the detection device for connecting the mobile terminal to an external device as described in any one of the above 5 to 8, and a USB interface.