CN202565386U - Video device and circuit controlling SCART interface output voltage - Google Patents
Video device and circuit controlling SCART interface output voltage Download PDFInfo
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- CN202565386U CN202565386U CN2012200607256U CN201220060725U CN202565386U CN 202565386 U CN202565386 U CN 202565386U CN 2012200607256 U CN2012200607256 U CN 2012200607256U CN 201220060725 U CN201220060725 U CN 201220060725U CN 202565386 U CN202565386 U CN 202565386U
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Abstract
The utility model discloses a circuit which is suitable for an SCART interface output to realize TV/AV1:9/AV4:5 function switching. The circuit comprises a first audion, a second audion, a first resistance, a second resistance, a third resistance and a fourth resistance, wherein the base of the first audion is connected with a general input/output port and a first voltage source; a collector electrode is connected with an output control level and a SCART interface pin which is used for connecting a television; the base of the second audion is connected with the general input/output port and the first voltage source; and the collector electrode is connected with the output control level and the collector electrode of the first audion. The utility model also provides a video device. Through the above mode, the video device and the circuit controlling the SCART interface output voltage can have the advantages of controlling the output voltage of the SCART interface pin by using the single general input/output port, improving the use ratio of the general input/output port, and saving the general input/output port source.
Description
Technical field
The utility model relates to the video equipment field, particularly relates to the circuit of a kind of video equipment and control SCART interface output voltage thereof.
Background technology
Along with the continuous lifting and the dimensional requirement of electronic product function and performance are more and more littler; Cause its corresponding master chip CPU (Central Processing Unit; Central processing unit) integrated level is also increasingly high; In this case, the utilance of GPI/O (General Purpose input/output, general input) resource is particularly important.Be example with the SCART interface below, set forth the situation of utilizing of general input.
The SCART interface is the interface that interconnects that regional mandatory requirements such as Europe are used for satellite television receiver, television set, video tape recorder and other audio & video equipment, allly provides above electronic product etc. all need dispose the SCART interface to these areas.The SCART interface is the connector of 21 PIN (pin); Standard EN 50 049-1/IEC 933-1 have done clear and definite definition and have used regulation these 21 PIN; Both can be used to transmit CVBS (Composite Video Base-band Signal; Composite video baseband signal), interlacing RGB vision signals such as (component signals), also can transmit stereo audio signal, defined Voice & Video signal transmission passage and control method etc. simultaneously.Wherein, PIN8 (Pin No.8 as shown in Figure 1, the hereinafter unification abbreviates PIN8 as) is to be used as: and Function switching I/O (function diverter switch input/outbound port) (L:＜2V, H:＞10V, 10Kohms).In practical application, in order to increase reliability and to consider actual conditions, generally can leave surplus, require H:＞9.5V.Wherein, L representes low level, and H representes high level.As shown in Figure 1, the SCART interface comprises 21 PIN, shows Pin No.1, Pin No.2, Pin No.8, Pin No.20 and Pin No.21 among the figure.
Television set switches the different working pattern through the magnitude of voltage that the PIN8 that detects SCART exports, and comprises TV (television, TV) pattern and AV (audio/video, audio frequency and video) pattern.Wherein, the AV pattern comprises 4:3 and two kinds of display modes of 16:9.Concrete control mode is seen
Table 1:
| The voltage of PIN8 (V) | TV shows |
| 0-2.0 | The TV pattern |
| 4.5-7.0 | The AV16:9 pattern |
| 9.5-12.0 | The AV4:3 pattern |
Table 1
The control circuit of the PIN8 output voltage of prior art general input control SCART is seen shown in Figure 2.Said control circuit comprises triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage source and TO SCART PIN8 (output control level).TO SCART PIN8 is connected on the PIN8 (figure does not show) of SCART interface.Two general input: 1 and 2 are used for controlling the output voltage values of the PIN8 of SCART, and these two general input all are connected to programmable chip, are controlled by software.Be connected with television set equivalent load Rt on the PIN8 of SCART interface, the Rt value is 10K ohm.Be provided with resistance R 1 between the base stage of triode Q1 and the general input 1; Be provided with resistance R 2 between the base stage of triode Q2 and the general input 2; R3 connects power supply and TO SCART PIN8, is provided with R4 between the collector electrode of triode Q2 and the TO SCART PIN8.
This circuit control logic is as shown in table 2, when general input 1=H, and triode Q1 conducting, current collection is low level very, and no matter the logic level of general input 2 is H or L, and PIN8 voltage all is 0, and perhaps near 0, TV is the TV pattern; As general input 1=L; During general input 2=H; Not conducting of triode Q1, triode Q2 conducting, the 12V voltage that voltage source provides is under the dividing potential drop effect of R4//Rt (parallel impedance of R4 and Rt) and resistance R 3; The voltage that outputs to PIN8 is in the 4.5V-7.0V voltage range, and TV is the AV16:9 pattern; As general input 1=L, during general input 2=L, triode Q1, not conductings of Q2, under the dividing potential drop effect of resistance R 3 and Rt, PIN8 is output as in the 9.5V-12.0V voltage range, and TV is the AV4:3 pattern.
Table 2
Prior art has been used two general input, and the utilance and the integrated level of general input are lower, and, control the logic state of two general input simultaneously, the software programming difficulty is bigger.
The utility model content
The technical problem that the utility model mainly solves provides the circuit of a kind of video equipment and control SCART interface output voltage thereof; Can use the output voltage of single general input control SCART interface pin; Improve the utilance of general input, save the general input resource.
For solving the problems of the technologies described above; The technical scheme that the utility model adopts is: provide a kind of suitable SCART interface output to realize the circuit that the TV/AV16:9/AV4:3 function is switched; This circuit comprises: first triode; The base stage of first triode is connected to the general input and first voltage source, and collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV; Second triode, the base stage of second triode are connected to the general input and first voltage source, and collector electrode is connected to the collector electrode of the output control level and first triode; First resistance, second resistance, the 3rd resistance and the 4th resistance; First resistance and second resistance are serially connected with between the base stage of first voltage source and first triode successively; General input is connected between first resistance and second resistance; The 3rd resistance one end is connected between the base stage of second resistance and first triode, other end ground connection, and the base stage of second triode is connected to general input through the 4th resistance; Wherein, the high level of general input, low level and high-impedance state correspond respectively to TV, AV4:3, AV16:9 pattern.
Wherein, foregoing circuit also comprises: second voltage source, second voltage source are connected to the collector electrode and output control level of first triode.
Wherein, the voltage that first voltage source provides is 3.3V, and the voltage that second voltage source provides is 12V.
Wherein, foregoing circuit also comprises: the 5th resistance, the 5th resistance string are connected between the collector electrode, output control level of collector electrode, second triode of second voltage source and first triode.
Wherein, foregoing circuit also comprises: the 6th resistance, the 6th resistance string are connected between the collector electrode and the 5th resistance of second triode.
Wherein, the equal ground connection of emitter of first triode, second triode.
Wherein, the SCART interface pin of TV is the 8th pin of SCART interface.
For solving the problems of the technologies described above, another technical scheme that the utility model adopts is: a kind of video equipment is provided, and video equipment comprises: video frequency processing chip, general input, control circuit and SCART interface;
Wherein, control circuit comprises: first triode, the base stage of first triode are connected to the general input and first voltage source, and collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV; Second triode, the base stage of second triode are connected to the general input and first voltage source, and collector electrode is connected to the collector electrode of the output control level and first triode; First resistance, second resistance, the 3rd resistance and the 4th resistance; First resistance and second resistance are serially connected with between the base stage of first voltage source and first triode successively; General input is connected between first resistance and second resistance; The 3rd resistance one end is connected between the base stage of second resistance and first triode, other end ground connection, and the base stage of second triode is connected to general input through the 4th resistance; Wherein, the high level of general input, low level and high-impedance state correspond respectively to TV, AV4:3, AV16:9 pattern; Wherein, an end of general input is connected with video frequency processing chip, and the other end is connected with the base stage of first triode of control circuit and the base stage of second triode; The SCART interface is connected with the output control level.
The beneficial effect of the utility model is: when being different from the output voltage of prior art video equipment control interface pin; Use the situation of two or more general input; The video equipment of the utility model comprises: video frequency processing chip, general input, control circuit and SCART interface; Wherein, general input is connected with video frequency processing chip, and control circuit is connected between general input and the SCART interface.Control circuit promptly is suitable for the output of SCART interface and realizes the circuit that the TV/AV16:9/AV4:3 function is switched; The concrete connected mode of circuit does; The base stage of first triode is connected to the general input and first voltage source; Collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV; The base stage of second triode is connected to the general input and first voltage source, and collector electrode is connected to the collector electrode of the output control level and first triode; Suitable resistance is set in the circuit again.Control the output voltage of SCART interface pin according to high level, low level and the high-impedance state of general input, and then realize the switching of TV/AV16:9/AV4:3 functional mode.By the way, the utility model can use the output voltage of single general input control SCART interface pin, has improved the utilance of general input, and has saved the general input resource.
Description of drawings
Fig. 1 is the front view of a kind of SCART interface of prior art;
Fig. 2 is the circuit diagram of a kind of SCART of control interface of prior art output voltage;
Fig. 3 is the circuit diagram of the utility model control SCART interface output voltage one embodiment;
Fig. 4 is the structural representation of the utility model video equipment one embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.
In view of the growing tension of present general input resource, if do not have under the prerequisite of obvious increase, realize identical functions with less general input at cost, that is of great advantage to product design.
Fig. 3 is the circuit diagram of the utility model control SCART interface output voltage one embodiment; As shown in the figure, the suitable SCART interface output of the utility model realizes that the circuit that the TV/AV16:9/AV4:3 function is switched comprises: first resistance R 5, second resistance R 6, the 3rd resistance R 7, the 4th resistance R 8, first voltage source, the first triode Q3, the second triode Q4 and output control level.
The suitable SCART interface output of the utility model realizes that the circuit that the TV/AV16:9/AV4:3 function is switched also comprises: the 5th resistance R 9, the 6th resistance R 10 and second voltage source.
Wherein, first voltage source provides 3.3V voltage, and second voltage source provides 12V voltage.
The concrete connected mode of circuit diagram shown in Figure 3 is following:
The base stage of the first triode Q3 is connected to the general input 3 and first voltage source; Collector electrode is connected to the output control level; And the SCART interface pin (figure do not show) that is used to be connected to TV, wherein, the output control level is connected with the SCART interface pin that is used to be connected to TV;
The base stage of the second triode Q4 is connected to the general input 3 and first voltage source, and collector electrode is connected to the collector electrode of the output control level and the first triode Q3;
First resistance R 5 and second resistance R 6 are serially connected with between the base stage of first voltage source and the first triode Q3 successively; General input 3 is connected between first resistance R 5 and second resistance R 6; The 3rd resistance R 7 one ends are connected between the base stage of second resistance R 6 and the first triode Q3; Other end ground connection, the base stage of the second triode Q4 is connected to general input 3 through the 4th resistance R 8;
Second voltage source is connected to the collector electrode and output control level of the first triode Q3;
The 5th resistance R 9 is serially connected with between second voltage source and the output control level, and the 6th resistance R 10 is serially connected with between the collector electrode and output control level of the second triode Q4;
When operate as normal, the SCART interface pin of TV connects the TV equivalent load Rt of a 10K ohm, and wherein, the end of TV equivalent load Rt is connected in the SCART interface pin of TV, other end ground connection;
In the present embodiment, the equal ground connection of emitter of the first triode Q3 and the second triode Q4, and the SCART interface pin of TV is the 8th pin (figure does not show) of SCART interface.The SCART interface pin of TV can also be other pins.
General input 3 is the control mouths that are used for controlling TO SCART PIN8 output voltage values, is connected to programmable chip, is controlled by software.Its control principle is following:
When general input 3=H (H=3.3V), under the dividing potential drop effect of R6 and R7, the base stage of triode Q3 is a high level; The Q3 conducting; Current collection is low level very, and TO SCART PIN8 voltage is 0, perhaps near 0; TV is the TV pattern, and the conducting state of triode Q4 does not have influence to above-mentioned pattern;
When general input 3=L, the base stage of triode Q3 and Q4 is low level, Q3 and not conductings of Q4, and 12V is under the dividing potential drop effect of R9 and Rt, and the voltage that makes TO SCART PIN8 is in the 9.5V-12.0V scope, and TV is the AV4:3 pattern;
When general input 3 is high-impedance states, be equivalent to resistance that general input 3 connects a 10M ohm to ground, can regard it as open circuit; Under the dividing potential drop effect of R5, R6, R7, R8; Not conducting of Q3, the Q4 conducting, 12V is under the dividing potential drop effect of R10//Rt (parallel impedance of R10 and Rt) and resistance R 9; The voltage that makes TO SCART PIN8 is in the 4.5V-7.0V scope, and TV is the AV16:9 pattern.Above-mentioned control logic is as shown in table 3:
| General input 3 | TO?SCART?PIN8 | TV shows |
| H | 0V | The TV pattern |
| L | 9.5V-12.0V | The AV4:3 pattern |
| High resistant | 4.5V-7.0V | The AV16:9 pattern |
Table 3
By the way, the utility model can be on the PIN8 of SCART interface be realized the controlled function of its output voltage with single general input.
It is pointed out that the thought of rationally utilizing the general input software resource fully, be not limited to the control general input of the PIN8 of above-mentioned SCART, also extend to other.
Present embodiment utilizes the multiple exportable logic level of single general input rationally, fully, cooperates suitable modified model peripheral circuit simultaneously, the control of mouthful output voltage that achieves a butt joint.Simultaneously, utilize above-mentioned thinking, can realize identical or more function.
Present embodiment does not have at cost under the prerequisite of obvious increase, and the controlled function with single general input realization interface output voltage has improved the utilance of general input, and saved the general input resource.Simultaneously, utilize single general input can reduce the software programming difficulty, rationally utilize the general input software resource fully.
The general input of present embodiment can be the general input of all programmable chip.
Fig. 4 is the structural representation of the utility model video equipment one embodiment; As shown in the figure; Video equipment comprises: video frequency processing chip 41, general input 42, control circuit 43 and SCART interface 44; Wherein, control circuit 43 is that suitable SCART interface output as shown in Figure 3 realizes the circuit that the TV/AV16:9/AV4:3 function is switched.
Wherein, general input 42 is connected with video frequency processing chip 41, and control circuit 43 is connected between general input 42 and the SCART interface 44.
Its concrete connected mode does; One end of general input 42 is connected with video frequency processing chip 41; The other end is connected with the base stage of first triode of control circuit 43; And the base stage of first triode is connected to the general input and first voltage source, and collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV;
Simultaneously; The other end of general input 42 is connected with the base stage of second triode of control circuit 43; And the base stage of second triode is connected to the general input and first voltage source, and collector electrode is connected to the collector electrode of the output control level and first triode;
SCART interface 44 is connected with the output control level.
Wherein, Control circuit also comprises: first resistance, second resistance, the 3rd resistance and the 4th resistance; First resistance and second resistance are serially connected with between the base stage of first voltage source and first triode successively, and general input is connected between first resistance and second resistance, and the 3rd resistance one end is connected between the base stage of second resistance and first triode; Other end ground connection, the base stage of second triode is connected to general input through the 4th resistance.
In this video equipment, the high level of general input 42, low level and high-impedance state correspond respectively to TV, AV4:3, AV16:9 pattern.
When being different from the output voltage of prior art video equipment control interface pin; Use the situation of two or more general input; The video equipment of the utility model comprises: video frequency processing chip, general input, control circuit and SCART interface; Wherein, general input is connected with video frequency processing chip, and control circuit is connected between general input and the SCART interface.Control circuit promptly is suitable for the output of SCART interface and realizes the circuit that the TV/AV16:9/AV4:3 function is switched; The concrete connected mode of circuit does; The base stage of first triode is connected to the general input and first voltage source; Collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV; The base stage of second triode is connected to the general input and first voltage source, and collector electrode is connected to the collector electrode of the output control level and first triode; Suitable resistance is set in the circuit again.Control the output voltage of SCART interface pin according to high level, low level and the high-impedance state of general input, and then realize the switching of TV/AV16:9/AV4:3 functional mode.By the way, the utility model can use the output voltage of single general input control SCART interface pin, has improved the utilance of general input, and has saved the general input resource.
The above is merely the embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (8)
1. a suitable SCART interface output realizes the circuit that the TV/AV16:9/AV4:3 function is switched, and it is characterized in that said circuit comprises:
First triode, the base stage of said first triode are connected to the general input and first voltage source, and collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV;
Second triode, the base stage of said second triode are connected to the said general input and first voltage source, and collector electrode is connected to the collector electrode of the said output control level and first triode;
First resistance, second resistance, the 3rd resistance and the 4th resistance; Said first resistance and second resistance are serially connected with between the base stage of first voltage source and first triode successively; Said general input is connected between first resistance and second resistance; Said the 3rd resistance one end is connected between the base stage of second resistance and first triode, other end ground connection, and the base stage of said second triode is connected to general input through the 4th resistance;
Wherein, the high level of said general input, low level and high-impedance state correspond respectively to TV, AV4:3, AV16:9 pattern.
2. circuit according to claim 1 is characterized in that, said circuit comprises:
Second voltage source, said second voltage source are connected to the collector electrode and output control level of first triode.
3. circuit according to claim 2 is characterized in that,
The voltage that said first voltage source provides is 3.3V, and the voltage that said second voltage source provides is 12V.
4. circuit according to claim 1 is characterized in that, said circuit comprises:
The 5th resistance, said the 5th resistance string are connected between the collector electrode, output control level of collector electrode, second triode of second voltage source and first triode.
5. circuit according to claim 4 is characterized in that, said circuit comprises:
The 6th resistance, said the 6th resistance string are connected between the collector electrode and the 5th resistance of second triode.
6. circuit according to claim 1 is characterized in that,
The equal ground connection of emitter of said first triode, second triode.
7. circuit according to claim 1 is characterized in that,
The SCART interface pin of said TV is the 8th pin of SCART interface.
8. a video equipment is characterized in that, comprising:
Video frequency processing chip, general input, control circuit and SCART interface;
Wherein, said control circuit comprises:
First triode, the base stage of said first triode are connected to the general input and first voltage source, and collector electrode is connected to the output control level, and the SCART interface pin that is used to be connected to TV;
Second triode, the base stage of said second triode are connected to the said general input and first voltage source, and collector electrode is connected to the collector electrode of the said output control level and first triode;
First resistance, second resistance, the 3rd resistance and the 4th resistance; Said first resistance and second resistance are serially connected with between the base stage of first voltage source and first triode successively; Said general input is connected between first resistance and second resistance; Said the 3rd resistance one end is connected between the base stage of second resistance and first triode, other end ground connection, and the base stage of said second triode is connected to general input through the 4th resistance;
Wherein, the high level of said general input, low level and high-impedance state correspond respectively to TV, AV4:3, AV16:9 pattern;
Wherein, an end of said general input is connected with video frequency processing chip, and the other end is connected with the base stage of first triode of said control circuit and the base stage of second triode;
Said SCART interface is connected with said output control level.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200607256U CN202565386U (en) | 2012-02-23 | 2012-02-23 | Video device and circuit controlling SCART interface output voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200607256U CN202565386U (en) | 2012-02-23 | 2012-02-23 | Video device and circuit controlling SCART interface output voltage |
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| CN202565386U true CN202565386U (en) | 2012-11-28 |
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| CN2012200607256U Expired - Fee Related CN202565386U (en) | 2012-02-23 | 2012-02-23 | Video device and circuit controlling SCART interface output voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
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2012
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
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Owner name: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SKY-WORTH DIGITAL TECHNOLOGY CO., LTD.;SHENZHEN CITY |
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Address after: 518000 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 14 layer Patentee after: Shenzhen Skyworth Digital Technology Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A block 14 layer Patentee before: Shenzhen Skyworth Digital Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20200223 |
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| CF01 | Termination of patent right due to non-payment of annual fee |