CN203760209U - MHL cable and MHL cable hot plug detecting system - Google Patents
MHL cable and MHL cable hot plug detecting system Download PDFInfo
- Publication number
- CN203760209U CN203760209U CN201320711735.6U CN201320711735U CN203760209U CN 203760209 U CN203760209 U CN 203760209U CN 201320711735 U CN201320711735 U CN 201320711735U CN 203760209 U CN203760209 U CN 203760209U
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- transmitting terminal
- mhl cable
- pin
- terminal connector
- resistance
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- Withdrawn - After Issue
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
The utility model discloses an MHL cable and an MHL cable hot plug detecting system, wherein a resistor is internally built inside the MHL cable, so that when the MHL cable is inserted into a sending end connector, a resistor internally built inside the MHL cable is connected between a plug-in detecting pin and a ground pin of the sending end connector in a crossed manner to serve as a pull-down resistor, or the resistor internally built inside the MHL cable is connected between the plug-in detecting pin and a power supply voltage pin of the sending end connector in a crossed manner to serve as a pull-up resistor; according to the utility model, that the sending end directly detects the hot plug actions of the MHL cable is achieved, and relaying on CBUS is not required. Therefore, the problem of communication failure is solved.
Description
Technical field
The utility model relates to electronic device field, particularly a kind of MHL cable and MHL cable hot plugging detection system.
Background technology
Mobile terminal high-definition audio and video standard interface MHL, in the time communicating, calls transmitting terminal (Source equipment) the equipment of output sound video, and the equipment that receives audio frequency and video is called to receiving terminal (Sink equipment), and transmitting terminal is connected by MHL cable with receiving terminal.
In prior art, MHL equipment is inserted to detect and normally power on the stage at receiving terminal, the control bus CBUS of transmitting terminal by MHL cable sends a pulse signal, in the time that receiving terminal receives the pulse signal that CBUS sends, returns to an identification signal establish a communications link to transmitting terminal.
In prior art detect receiving terminal whether by MHL cable access transmitting terminal in, need to ensure that receiving terminal powers on, if but receiving terminal need to be powered and receiving terminal is to establish a communications link by CBUS state-detection by transmitting terminal, because supply lines and holding wire are all fixed in same MHL cable, can cause receiving terminal transmitting terminal in doing startup work just to send data flow, thereby cause the deviation in sequential, cause communication failure.
Utility model content
A kind of MHL cable that the utility model provides and MHL cable hot plugging detection system, to realize the action of transmitting terminal direct-detection MHL cable hot plugging, and need not rely on CBUS, thereby overcome the problem of communication failure.
The utility model provides a kind of MHL cable, the built-in resistance of described MHL cable, make in the time that described MHL cable inserts described transmitting terminal connector, the insertion that the built-in resistance of described MHL cable is connected across transmitting terminal connector detects between pin and grounding pin, as pull down resistor; Or
The insertion that the built-in resistance of described MHL cable is connected across described transmitting terminal connector detects between pin and supply voltage pin, as pull-up resistor.
Preferably, the resistance of the built-in resistance of described MHL cable meets:
In the time that the built-in resistance of described MHL cable is pull down resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled down to low level from high level; Or
In the time that the built-in resistance of described MHL cable is pull-up resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled to high level from low level.
The utility model also provides a kind of MHL cable hot plugging detection system, and described system comprises: transmitting terminal CPU, transmitting terminal connector and MHL cable as claimed in claim 1 or 2, wherein:
The insertion of described transmitting terminal connector detects pin and is connected with described transmitting terminal CPU;
Described transmitting terminal CPU, detects the state of pin for the insertion of obtaining described transmitting terminal connector, and the hot plug that realizes MHL cable detects.
Preferably, described transmitting terminal CPU, detect the level state of pin for obtaining the insertion of described transmitting terminal connector, in the time that the insertion detection pin level state of described transmitting terminal connector does not change, confirm that described MHL cable does not insert described transmitting terminal connector, when the insertion of described transmitting terminal connector detects pin when high level becomes low level or become high level from low level, confirm that described MHL cable inserts described transmitting terminal connector.
Preferably, in the time that the built-in resistance of described MHL cable is pull down resistor, the insertion of described transmitting terminal connector detects pin and is connected with power supply by the first pull-up resistor, and the ratio of described supply voltage and described the first pull-up resistor resistance is no more than the maximum current that described insertion detection pin can bear;
In the time that the built-in resistance of described MHL cable is pull-up resistor, the insertion of described transmitting terminal connector detects pin by the first pull down resistor ground connection, and the ratio of the built-in pull-up resistor resistance of the voltage of described supply voltage pin and described MHL cable is no more than the maximum current that described insertion detection pin can bear.
Preferably, described supply voltage is 3.3V～5V.
The utility model provides a kind of hot plug detection method of MHL cable as above, and described method comprises:
Transmitting terminal CPU obtains the level state of the insertion detection pin of transmitting terminal connector, and the hot plug that realizes MHL cable detects; Wherein, the built-in resistance of described MHL cable, the resistance of described resistance meets:
In the time that the built-in resistance of described MHL cable is pull down resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled down to low level from high level;
Or in the time that the built-in resistance of described MHL cable is pull-up resistor, described MHL cable inserts described transmitting terminal connector, the insertion of described transmitting terminal connector detects pin and is pulled to high level from low level.
Preferably, transmitting terminal CPU obtains the level state of the insertion detection pin of transmitting terminal connector;
In the time that the insertion detection pin level state of described transmitting terminal connector does not change, confirm that described MHL cable does not insert described transmitting terminal connector;
When the insertion of described transmitting terminal connector detects pin when high level becomes low level or become high level from low level, confirm that described MHL cable inserts described transmitting terminal connector.
Preferably, in the time that the built-in resistance of described MHL cable is pull down resistor, the insertion of described transmitting terminal connector detects pin and is connected with power supply by the first pull-up resistor, and the ratio of described supply voltage and described the first pull-up resistor resistance is no more than the maximum current that described insertion detection pin can bear;
In the time that the built-in resistance of described MHL cable is pull-up resistor, the insertion of described transmitting terminal connector detects pin by the first pull down resistor ground connection, and the ratio of the built-in pull-up resistor resistance of the voltage of described supply voltage pin and described MHL cable is no more than the maximum current that described insertion detection pin can bear.
Preferably, the supply voltage that described method adopts is 3.3V～5V.
The beneficial effect of the utility model embodiment is: by the built-in resistance of MHL cable, in the time that MHL cable inserts transmitting terminal connector, the level state that built-in resistance makes the insertion of transmitting terminal connector detect pin changes, reduce to low level or pull into high level from low level originally from high level originally, and the CPU of transmitting terminal detects the variation of inserting detection pin, thereby confirm whether MHL cable inserts transmitting terminal connector, the utility model has been realized the action of transmitting terminal direct-detection MHL cable hot plugging, and need not rely on CBUS, make receiving terminal can after being ready to, go again to receive data, overcome the problem of communication failure.
Brief description of the drawings
Fig. 1 (a) is (b) the model configuration figure of a kind of MHL cable of the utility model one embodiment;
Fig. 2 is the structure chart of a kind of MHL cable hot plugging detection system of the utility model one embodiment;
Fig. 3 is the equivalent circuit diagram of a kind of MHL cable hot plugging detection system of the utility model one embodiment;
Fig. 4 is another structure chart of a kind of MHL cable hot plugging detection system of the utility model one embodiment;
Fig. 5 is another equivalent circuit diagram of a kind of MHL cable hot plugging detection system of the utility model one embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
Fig. 1 is the model configuration figure of a kind of MHL cable of the utility model one embodiment; The built-in resistance of described MHL cable 100, make in the time that described MHL cable inserts described transmitting terminal connector, as shown in Fig. 1 (a), the insertion that the built-in resistance of described MHL cable 100 is connected across transmitting terminal connector detects between pin 2 and grounding pin 15, as pull down resistor;
Or as shown in Fig. 1 (b), the insertion that the built-in resistance of described MHL cable is connected across described transmitting terminal connector detects between pin 2 and supply voltage pin VBUS, as pull-up resistor.
In an embodiment of the present utility model, the resistance of the built-in resistance of MHL cable must meet: in the time that described MHL cable inserts described transmitting terminal connector, make the insertion detection pin of transmitting terminal connector can realize the height variation of level; That is:
In the time that the built-in resistance of described MHL cable is pull down resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled down to low level from high level; Or
In the time that the built-in resistance of described MHL cable is pull-up resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled to high level from low level.
Fig. 2 provides the structure chart of a kind of MHL cable hot plugging detection system of the utility model one embodiment, and in this structure chart, the built-in resistance of described MHL cable is pull down resistor.Described system 200 comprises: transmitting terminal CPU210, transmitting terminal connector 220 and MHL cable 230, wherein:
The insertion that the built-in resistance R 2 of described MHL cable 230 is connected across transmitting terminal connector 220 detects between pin 2 and grounding pin 15, and the insertion of described transmitting terminal connector 220 detects pin 2 and is connected with described transmitting terminal CPU210; Concrete, described insertion detects pin 2 and is connected with the bus extender GPIO of described transmitting terminal CPU210, transmitting terminal CPU210 can be detected and insert the level state variation that detects pin 2.
Described transmitting terminal CPU210, detects the state of pin 2 for the insertion of obtaining described transmitting terminal connector 220, and the hot plug that realizes MHL cable 230 detects.
In an embodiment of the present utility model, described transmitting terminal CPU210, detect the level state of pin 2 for obtaining the insertion of described transmitting terminal connector 220, in the time that insertion detection pin 2 level states of described transmitting terminal connector 220 do not change, confirm that described MHL cable 230 does not insert described transmitting terminal connector 220, in the time that the insertion detection pin 2 of described transmitting terminal connector 220 becomes low level from high level, confirm that described MHL cable 230 inserts described transmitting terminal connector 220.
As shown in Figure 2, the insertion of described transmitting terminal connector 220 detects pin 2 and is connected with power vd D by the first pull-up resistor R1, and the ratio of described supply voltage VDD and described the first pull-up resistor R1 resistance is no more than the maximum current that described insertion detection pin 2 can bear.
Fig. 3 is the equivalent circuit diagram of above-mentioned MHL cable hot plugging detection system, wherein, the insert action of switch simulation MHL cable, before MHL cable inserts, insert detection pin 2 and pass through the first pull-up resistor R1 clamper at high level, after MHL cable inserts, the resistance R 2 that MHL cable is built-in and the first pull-up resistor R1 form path dividing potential drop, and the voltage that inserts detection pin 2 is reduced to
wherein, in conjunction with the value (being generally 3.3V) of supply voltage VDD, after the resistance of resistance R 1, R2 must meet dividing potential drop, the voltage that inserts detection pin 2 drops on chip and judges in low level scope, detect the level state of pin 2 with the insertion before being different from, make transmitting terminal CPU210 the hot plug action of MHL cable can be detected.
Conventionally,
?
should be less than 20%, as can be seen here, R1 resistance should be to be more than or equal to four times of R2 resistance.
Fig. 4 provides another structure chart of a kind of MHL cable hot plugging detection system of the utility model one embodiment, and in this structure chart, the built-in resistance of described MHL cable is pull-up resistor.Described system 400 comprises: transmitting terminal CPU410, transmitting terminal connector 420 and MHL cable 430, wherein:
The insertion that the built-in resistance R 2 of described MHL cable is connected across transmitting terminal connector detects between pin 2 and supply voltage pin VBUS, and the insertion of described transmitting terminal connector 420 detects pin 2 and is connected with described transmitting terminal CPU410; Concrete, described insertion detects pin 2 and is connected with the bus extender GPIO of described transmitting terminal CPU410, transmitting terminal CPU410 can be detected and insert the level state variation that detects pin 2.
Described transmitting terminal CPU410, detects the state of pin 2 for the insertion of obtaining described transmitting terminal connector 420, and the hot plug that realizes MHL cable 430 detects.
In an embodiment of the present utility model, described transmitting terminal CPU410, detect the level state of pin 2 for obtaining the insertion of described transmitting terminal connector 420, in the time that insertion detection pin 2 level states of described transmitting terminal connector 420 do not change, confirm that described MHL cable 430 does not insert described transmitting terminal connector 420, in the time that the insertion detection pin 2 of described transmitting terminal connector 420 becomes high level from low level, confirm that described MHL cable 430 inserts described transmitting terminal connector 420.
As shown in Figure 4, the insertion of described transmitting terminal connector 420 detects pin 2 by the first pull down resistor R3 ground connection, and the ratio of the built-in pull-up resistor R2 resistance of the voltage of described supply voltage pin 2 and described MHL cable is no more than the maximum current that described insertion detection pin 2 can bear.
Fig. 5 is the equivalent circuit diagram of above-mentioned MHL cable hot plugging detection system, wherein, the insert action of switch simulation MHL cable, before MHL cable inserts, insert detection pin 2 and pass through pull down resistor R3 clamper in low level, after MHL cable inserts, the resistance R 2 that MHL cable is built-in and the first pull down resistor R3 form path dividing potential drop, the voltage that makes to insert detection pin 2 draw high into
wherein, in conjunction with the value (being generally 5V) of supply voltage VBUS, after the resistance of resistance R 3, R2 must meet dividing potential drop, insert and detect the voltage of pin 2 and drop in the scope that chip judges high level, detect the level state of pin 2 with the insertion before being different from, make transmitting terminal CPU410 the hot plug action of MHL cable can be detected.
Conventionally,
?
should be greater than 80%.R2 resistance should be to be more than or equal to four times of R3 as can be seen here, and R3 can be 4.7K Ω, can be also 10K Ω.
In an embodiment of the present utility model, described supply voltage is 3.3V～5V, described the first pull-up resistor R1 and the first pull down resistor R3 are current-limiting resistance, and preferred, described the first pull-up resistor R1 and the first pull down resistor R3 are the standard resistor of value kilohm level.
The utility model also provides a kind of hot plug detection method of MHL cable as above, and described method comprises:
Transmitting terminal CPU obtains the level state of the insertion detection pin of transmitting terminal connector, and the hot plug that realizes MHL cable detects; Wherein, the built-in resistance of described MHL cable, the resistance of described resistance meets:
In the time that the built-in resistance of described MHL cable is pull down resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled down to low level from high level;
Or in the time that the built-in resistance of described MHL cable is pull-up resistor, described MHL cable inserts described transmitting terminal connector, the insertion of described transmitting terminal connector detects pin and is pulled to high level from low level.
In an embodiment of the present utility model, transmitting terminal CPU obtains the level state of the insertion detection pin of transmitting terminal connector, in the time that the insertion detection pin level state of described transmitting terminal connector does not change, confirm that described MHL cable does not insert described transmitting terminal connector; When the insertion of described transmitting terminal connector detects pin when high level becomes low level or become high level from low level, confirm that described MHL cable inserts described transmitting terminal connector.
In an embodiment of the present utility model, in the time that the built-in resistance of described MHL cable is pull down resistor, the insertion of described transmitting terminal connector detects pin and is connected with power supply by the first pull-up resistor, and the ratio of described supply voltage and described the first pull-up resistor resistance is no more than the maximum current that described insertion detection pin can bear; In the time that the built-in resistance of described MHL cable is pull-up resistor, the insertion of described transmitting terminal connector detects pin by the first pull down resistor ground connection, and the ratio of the built-in pull-up resistor resistance of the voltage of described supply voltage pin and described MHL cable is no more than the maximum current that described insertion detection pin can bear.
In an embodiment of the present utility model, the supply voltage that described method adopts is 3.3V～5V.
The beneficial effect of the utility model embodiment is: by the built-in resistance of MHL cable, in the time that MHL cable inserts transmitting terminal connector, the level state that built-in resistance makes the insertion of transmitting terminal connector detect pin changes, reduce to low level or pull into high level from low level originally from high level originally, and the CPU of transmitting terminal detects the variation of inserting detection pin, thereby confirm whether MHL cable inserts transmitting terminal connector, the utility model has been realized the action of transmitting terminal direct-detection MHL cable hot plugging, and need not rely on CBUS, make receiving terminal can after being ready to, go again to receive data, overcome the problem of communication failure.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All any amendments of doing, be equal to replacement, improvement etc. within spirit of the present utility model and principle, be all included in protection range of the present utility model.
Claims (6)
1. a MHL cable, is characterized in that, the built-in resistance of described MHL cable, makes in the time that described MHL cable inserts described transmitting terminal connector,
The insertion that the built-in resistance of described MHL cable is connected across transmitting terminal connector detects between pin and grounding pin, as pull down resistor; Or
The insertion that the built-in resistance of described MHL cable is connected across described transmitting terminal connector detects between pin and supply voltage pin, as pull-up resistor.
2. cable as claimed in claim 1, is characterized in that, the resistance of the built-in resistance of described MHL cable meets:
In the time that the built-in resistance of described MHL cable is pull down resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled down to low level from high level; Or
In the time that the built-in resistance of described MHL cable is pull-up resistor, described MHL cable inserts described transmitting terminal connector, and the insertion of described transmitting terminal connector detects pin and is pulled to high level from low level.
3. a MHL cable hot plugging detection system, is characterized in that, described system comprises: transmitting terminal CPU, transmitting terminal connector and MHL cable as claimed in claim 1 or 2, wherein:
The insertion of described transmitting terminal connector detects pin and is connected with described transmitting terminal CPU;
Described transmitting terminal CPU, detects the state of pin for the insertion of obtaining described transmitting terminal connector, and the hot plug that realizes MHL cable detects.
4. system as claimed in claim 3, is characterized in that,
Described transmitting terminal CPU, detect the level state of pin for obtaining the insertion of described transmitting terminal connector, in the time that the insertion detection pin level state of described transmitting terminal connector does not change, confirm that described MHL cable does not insert described transmitting terminal connector, when the insertion of described transmitting terminal connector detects pin when high level becomes low level or become high level from low level, confirm that described MHL cable inserts described transmitting terminal connector.
5. system as claimed in claim 3, is characterized in that,
In the time that the built-in resistance of described MHL cable is pull down resistor, the insertion of described transmitting terminal connector detects pin and is connected with power supply by the first pull-up resistor, and the ratio of described supply voltage and described the first pull-up resistor resistance is no more than the maximum current that described insertion detection pin can bear;
In the time that the built-in resistance of described MHL cable is pull-up resistor, the insertion of described transmitting terminal connector detects pin by the first pull down resistor ground connection, and the ratio of the built-in pull-up resistor resistance of the voltage of described supply voltage pin and described MHL cable is no more than the maximum current that described insertion detection pin can bear.
6. system as claimed in claim 5, is characterized in that, described supply voltage is 3.3V～5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320711735.6U CN203760209U (en) | 2013-11-12 | 2013-11-12 | MHL cable and MHL cable hot plug detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320711735.6U CN203760209U (en) | 2013-11-12 | 2013-11-12 | MHL cable and MHL cable hot plug detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203760209U true CN203760209U (en) | 2014-08-06 |
Family
ID=51255455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320711735.6U Withdrawn - After Issue CN203760209U (en) | 2013-11-12 | 2013-11-12 | MHL cable and MHL cable hot plug detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203760209U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700444A (en) * | 2013-11-12 | 2014-04-02 | 青岛歌尔声学科技有限公司 | MHL cable, MHL cable hot plug detecting system and detecting method |
| CN114624635A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | Plug-pull detection system and method of VGA display interface and electronic equipment |
-
2013
- 2013-11-12 CN CN201320711735.6U patent/CN203760209U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700444A (en) * | 2013-11-12 | 2014-04-02 | 青岛歌尔声学科技有限公司 | MHL cable, MHL cable hot plug detecting system and detecting method |
| CN114624635A (en) * | 2022-05-17 | 2022-06-14 | 陕西天视致远航空技术有限公司 | Plug-pull detection system and method of VGA display interface and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |