CN211406162U

CN211406162U - Serial port and audio and video output shared interface circuit

Info

Publication number: CN211406162U
Application number: CN202020544797.2U
Authority: CN
Inventors: 吴成达; 邹绍见
Original assignee: Zhuhai Gotech Intelligent Technology Co Ltd
Current assignee: Zhuhai Gotech Intelligent Technology Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-09-01
Anticipated expiration: 2030-04-14

Abstract

The utility model discloses a serial port and audio and video output sharing interface circuit, including an audio and video interface seat that sets up on the set-top box shell, the audio and video interface seat includes one end opening and hollow plug wire interface, is provided with first interface end, second interface end, third interface end and a earthing terminal in the plug wire interface, earthing terminal ground connection; the set-top box is internally provided with a master control module, the master control module comprises a control chip, an audio and video output interface used for connecting an audio and video network and a serial interface used for connecting a serial port network, the control chip is respectively connected with the audio and video output interface and the serial interface to form a shared interface circuit, and after different plugs are inserted into the plug wire interfaces, different plugs are communicated with corresponding functional signal ends. The utility model discloses a serial ports and an external interface of audio frequency and video interface sharing can practice thrift the cost, effectively reduce the size of STB, accomplish more miniaturization.

Description

Serial port and audio and video output shared interface circuit

[ technical field ] A method for producing a semiconductor device

The utility model relates to a STB technical field, it is specific, relate to a serial ports and audio and video output sharing interface circuit.

[ background of the invention ]

At present, external interfaces of set-top boxes on the market generally comprise audio and video interfaces and serial ports, but the set-top boxes tend to be miniaturized, and the requirements on low cost are higher and higher. The audio/video AV interface and the serial port on the market are still two interfaces and are not combined. Therefore, it is important to merge some interfaces without affecting normal use.

[ Utility model ] content

In order to overcome the defects of the prior art, the utility model aims to provide a serial port and audio and video output sharing interface circuit, which uses an interface to realize two functions.

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

a serial port and audio and video output shared interface circuit comprises an audio and video interface seat arranged on a shell of a set top box, wherein the audio and video interface seat comprises a hollow plug wire interface with an opening at one end, a first interface end, a second interface end, a third interface end and a grounding end are arranged in the plug wire interface, and the grounding end is grounded; a master control module is arranged in the set top box and comprises a control chip, an audio and video output interface used for connecting an audio and video network and a serial interface used for connecting a serial port network, and the control chip is respectively connected with the audio and video output interface and the serial interface to form the shared interface circuit; the UART _ TX signal end of the serial interface is connected with an RCA _ R _ OUT signal end of the audio and video output interface and then connected in series with a first interface end of the plug wire interface, the UART _ RX signal end of the serial interface is connected with an RCA _ L _ OUT signal end of the audio and video output interface and then connected in series with a second interface end of the plug wire interface, the UART _ Detec signal end of the serial interface is connected with a CVBS signal end of the audio and video output interface and then connected in series with a third interface end of the plug wire interface, one IO port of the control chip detects level signals of the UART _ Detec signal end of the serial interface, and after different plugs are inserted into the plug wire interface, different plugs are communicated with corresponding functional signal ends.

A further scheme is that the main control module further comprises a pull-up resistor, and the UART _ Detec signal terminal is pulled up to a power supply VDD through the pull-up resistor.

In a further scheme, the 1 pin and the 6 pin of the audio/video interface seat are suspended, the 2 pin and the 2-1 pin correspond to the first interface end after being connected, the 3 pin and the 3-1 pin correspond to the second interface end after being connected, the 4 pin and the 4-1 pin correspond to the third interface end after being connected, and the 5 pin and the 5-1 pin correspond to the grounding end after being connected.

A further scheme is that the main control module further includes a first capacitor, a second capacitor, a first ESD discharge diode and a second ESD discharge diode, a first end of the first capacitor is connected to the UART _ TX signal terminal of the serial interface and the RCA _ R _ OUT signal terminal of the audio/video output interface, a first end of the second capacitor is connected to the UART _ RX signal terminal of the serial interface and the RCA _ L _ OUT signal terminal of the audio/video output interface, a first end of the first ESD discharge diode is connected between the RCA _ R _ OUT signal terminal of the audio/video output interface and the first interface terminal of the patch cord interface, and a first end of the second ESD discharge diode is connected between the RCA _ L _ OUT signal terminal of the audio/video output interface and the second interface terminal of the patch cord interface.

In a further scheme, the control chip is a GX6605S chip.

The utility model has the advantages that: on the premise of saving cost, the serial port and the audio/video AV interface share the external interface, so that the cost can be saved, the size of the set top box can be effectively reduced, and the set top box is more miniaturized.

[ description of the drawings ]

Fig. 1 is a circuit schematic diagram of an embodiment of the interface circuit shared by the serial port and the audio/video output of the utility model.

Fig. 2 is a circuit schematic diagram of a control chip in the embodiment of the interface circuit shared by the serial port and the audio/video output.

Fig. 3 is a schematic circuit diagram of an external serial port in the embodiment of the serial port and audio/video output shared interface circuit.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

Referring to fig. 1 and 2, the utility model discloses a serial ports and audio and video output sharing interface circuit includes that one sets up audio and video interface seat J1 on the set-top box shell, and audio and video interface seat J1 includes one end opening and hollow plug wire interface, is provided with first interface end, second interface end, third interface end and a earthing terminal in the plug wire interface, earthing terminal ground connection.

In this embodiment, a main control module is arranged in the set-top box, the main control module includes a control chip U1, an audio/video output interface for connecting an audio/video network, and a serial interface for connecting a serial port network, and the control chip U1 is connected with the audio/video output interface and the serial interface respectively to form a common interface circuit.

In this embodiment, the UART _ TX signal terminal of the serial interface is connected to the RCA _ R _ OUT signal terminal of the audio/video output interface and then connected in series to the first interface terminal of the plug wire interface, the UART _ RX signal terminal of the serial interface is connected to the RCA _ L _ OUT signal terminal of the audio/video output interface and then connected in series to the second interface terminal of the plug wire interface, the UART _ Detec signal terminal of the serial interface is connected to the CVBS signal terminal of the audio/video output interface and then connected in series to the third interface terminal of the plug wire interface, one IO port of the control chip U1 detects a level signal of the UART _ Detec signal terminal of the serial interface, and when different plugs are inserted into the plug wire interface, different plugs are connected to corresponding functional signal terminals.

In this embodiment, the main control module further includes a pull-up resistor R1, and the UART _ Detec signal terminal is pulled up to the power supply VDD through the pull-up resistor R1.

The audio and video interface seat J1 has pins 1 and 6 suspended, pins 2 and 2-1 connected to correspond to the first interface end, pins 3 and 3-1 connected to correspond to the second interface end, pins 4 and 4-1 connected to correspond to the third interface end, and pins 5 and 5-1 connected to correspond to the ground end.

In this embodiment, the main control module further includes a first capacitor C1, a second capacitor C2, a first ESD discharge diode DV1, and a second ESD discharge diode DV2, a first end of the first capacitor C1 is connected to the UART _ TX signal end of the serial interface and the RCA _ R _ OUT signal end of the audio/video output interface, a first end of the second capacitor C2 is connected to the UART _ RX signal end of the serial interface and the RCA _ L _ OUT signal end of the audio/video output interface, a first end of the first ESD discharge diode DV1 is connected between the RCA _ R _ OUT signal end of the audio/video output interface and the first interface end of the plug wire interface, and a first end of the second ESD discharge diode C2 is connected between the RCA _ L _ OUT signal end of the audio/video output interface and the second interface end of the plug wire interface.

Preferably, the control chip U1 is a GX6605S chip.

Specifically, the serial port and audio/video output shared interface circuit of this embodiment is located at the set top box end. The audio and video output interface comprises an RCA _ R _ OUT signal end, two audio networks of an RCA _ L _ OUT signal end, a video network of a CVBS signal end and GND grounding, and the serial interface comprises a UART _ TX signal end, two networks of a UART _ RX signal end and GND grounding. The network of the UART _ RX signal terminal and the RCA _ L _ OUT signal terminal is combined into one network, and the network of the UART _ TX signal terminal and the RCA _ R _ OUT signal terminal is combined into one network.

And an IO port is further taken from the control chip U1 and connected to the UART _ Detec signal terminal of the serial interface, the IO port is used for detecting serial port insertion, the UART _ Detec signal terminal is pulled up to the VCC power supply by a pull-up resistor R1, and the UART _ Detec signal terminal network and the CVBS signal terminal network are combined into the same network.

The networks are merged and then connected to the original audio and video interface seat J1, so that a serial port and audio and video output shared interface circuit is formed.

In practical application, when the set-top box is started, the serial port network (the UART _ RX signal terminal, the UART _ TX signal terminal) and the audio/video network (the RCA _ R _ OUT signal terminal, the RCA _ L _ OUT signal terminal, and the CVBS signal terminal) are both in a high-impedance input state, the state of the UART _ Detec signal terminal is detected by the control chip U1, if the state is high level, the audio/video output is normally started, and the serial port maintains the high-impedance input state.

Certainly, if a specially-made external serial port is inserted in advance before starting up, as shown in fig. 3, the UART _ Detec signal terminal is grounded, and at this time, the IO port of the set-top box control chip U1 detects that the state of the UART _ Detec signal terminal is low level, so that the serial port is started to work, and the audio/video output keeps a high-impedance input state.

It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.

Claims

1. The utility model provides a serial ports and audio and video output sharing interface circuit which characterized in that includes:

the audio and video interface seat is arranged on the shell of the set top box and comprises a hollow plug wire interface with one open end, a first interface end, a second interface end, a third interface end and a grounding end are arranged in the plug wire interface, and the grounding end is grounded;

a master control module is arranged in the set top box and comprises a control chip, an audio and video output interface used for connecting an audio and video network and a serial interface used for connecting a serial port network, and the control chip is respectively connected with the audio and video output interface and the serial interface to form the shared interface circuit;

the UART _ TX signal end of the serial interface is connected with an RCA _ R _ OUT signal end of the audio and video output interface and then connected in series with a first interface end of the plug wire interface, the UART _ RX signal end of the serial interface is connected with an RCA _ L _ OUT signal end of the audio and video output interface and then connected in series with a second interface end of the plug wire interface, the UART _ Detec signal end of the serial interface is connected with a CVBS signal end of the audio and video output interface and then connected in series with a third interface end of the plug wire interface, one IO port of the control chip detects level signals of the UART _ Detec signal end of the serial interface, and after different plugs are inserted into the plug wire interface, different plugs are communicated with corresponding functional signal ends.

2. The serial port and audio/video output shared interface circuit according to claim 1, characterized in that:

the UART _ Detec signal end is pulled up to a power supply VDD through the pull-up resistor.

3. The serial port and audio/video output shared interface circuit according to claim 1, characterized in that:

the pins 1 and 6 of the audio and video interface seat are suspended, the pins 2 and 2-1 correspond to the first interface end after being connected, the pins 3 and 3-1 correspond to the second interface end after being connected, the pins 4 and 4-1 correspond to the third interface end after being connected, and the pins 5 and 5-1 correspond to the grounding end after being connected.

4. The serial port and audio/video output shared interface circuit according to claim 3, characterized in that:

the master control module further comprises a first capacitor, a second capacitor, a first ESD discharge diode and a second ESD discharge diode, wherein a first end of the first capacitor is connected to a UART _ TX signal end of the serial interface and an RCA _ R _ OUT signal end of the audio/video output interface, a first end of the second capacitor is connected to a UART _ RX signal end of the serial interface and an RCA _ L _ OUT signal end of the audio/video output interface, a first end of the first ESD discharge diode is connected between an RCA _ R _ OUT signal end of the audio/video output interface and a first interface end of the plug wire interface, and a first end of the second ESD discharge diode is connected between an RCA _ L _ OUT signal end of the audio/video output interface and a second interface end of the plug wire interface.

5. The serial port and audio/video output shared interface circuit according to any one of claims 1 to 4, characterized in that:

the control chip is a GX6605S chip.