CN204496230U - A kind of two MCU control switching circuit and display device - Google Patents
A kind of two MCU control switching circuit and display device Download PDFInfo
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- CN204496230U CN204496230U CN201520195733.5U CN201520195733U CN204496230U CN 204496230 U CN204496230 U CN 204496230U CN 201520195733 U CN201520195733 U CN 201520195733U CN 204496230 U CN204496230 U CN 204496230U
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Abstract
The utility model proposes a kind of two MCU control switching circuit and display device, circuit comprises a MCU, the 2nd MCU, serial ports, control switching circuit, the first communicating circuit and the second communicating circuit; The Opportunity awaiting control for linear signal output part of signal input part connection control the one MCU of control switching circuit; When a MCU job, when the Opportunity awaiting control for linear signal output part of a MCU exports high level, this high level controls the first communicating circuit becomes path, and controls the second communicating circuit and become open circuit; When a MCU is standby, the Opportunity awaiting control for linear signal output part output low level of a MCU, this low level control first communicating circuit becomes open circuit, and controls the second communicating circuit and become path; Realize thus, under same duty, one, two communicating circuits maintenance path keeps open circuit, thus when ensureing serial ports and a MCU communication, communication signal can not return and be poured on another MCU.
Description
Technical field
The utility model relates to technical field of circuit design, is specifically related to a kind of two MCU control switching circuit and display device.
Background technology
When business television is applied to hotels and other places, need switching or the switching on and shutting down control of multiple stage business television being carried out simultaneously to signal source.Common way is, uses a computer remote to control multiple stage business television.
A kind of business television control cage composition as shown in Figure 1, has a serial ports 11 and two chips: the standby MCU13 of main MCU12 and low-power consumption in business television 1; Wherein, main MCU12 is responsible for the switching on and shutting down of business television 1, and standby MCU13 is for standby; Computer 2 is connected with the serial ports 11 of business television by serial ports 21, controls two MCU of business television 1 simultaneously; Be specially, the signal input part of main MCU and standby MCU is connected to the data-out pin of serial ports simultaneously, and the signal output part of main MCU and standby MCU is connected to the data output pins of serial ports simultaneously.
For switching on and shutting down, the detailed process that computer 2 controls business television 1 is: computer 2 is started shooting or off signal by serial ports 11 transmission of serial ports 21 to business television 1, control signal enters main MCU and standby MCU by the data-out pin of serial ports 11, main MCU and standby MCU determines whether according to the signal type received the useful signal issuing self, then performs start or shutdown; The feedback data of main MCU and standby MCU sends to computer 2 by the data output pins of serial ports 11.But, because the feedback data transmitting terminal of main MCU and standby MCU is all connected to the data output pins of serial ports 11, when main MCU or standby MCU sends feedback signal to computer time, the feedback signal of main MCU or standby MCU can be returned by connection and be poured on standby MCU or main MCU, causes interference to main MCU or standby MCU.
Summary of the invention
The embodiment of the present application is by providing a kind of two MCU control switching circuit and display device, and when controlling two MCU device by serial ports to solve in prior art, the feedback signal of existence returns the technical matters of filling.
For solving the problems of the technologies described above, the embodiment of the present application is achieved by the following technical solutions:
Propose a kind of two MCU control switching circuit, comprise a MCU, the 2nd MCU, serial ports, control switching circuit, the first communicating circuit and the second communicating circuit; The Opportunity awaiting control for linear signal output part of a MCU described in the signal input part connection control of described control switching circuit, first signal output part of described control switching circuit connects the control input end of described first communicating circuit, and the secondary signal output terminal of described control switching circuit connects the control input end of described second communicating circuit; First communication signal input end of described first communicating circuit is all connected the signal input pin of described serial ports with the first communication signal input end of described second communicating circuit; First communication signal output terminal of described first communicating circuit is all connected the signal output pin of described serial ports with the first communication signal output terminal of described second communicating circuit; Second communication signal output terminal of described first communicating circuit connects the control signal input end of a described MCU, and the second communication signal input end of described first communicating circuit connects the control signal output terminal of a described MCU; Second communication signal output terminal of described second communicating circuit connects the control signal input end of described 2nd MCU, and the second communication signal input end of described second communicating circuit connects the control signal output terminal of described 2nd MCU; Wherein, the Opportunity awaiting control for linear signal output part of a described MCU exports high level, the output low level when a described MCU is standby when a described MCU job.
Propose a kind of display device, comprise two MCU control switching circuit; Described pair of MCU control switching circuit comprises a MCU, the 2nd MCU, serial ports, control switching circuit, the first communicating circuit and the second communicating circuit; The Opportunity awaiting control for linear signal output part of a MCU described in the signal input part connection control of described control switching circuit, first signal output part of described control switching circuit connects the control input end of described first communicating circuit, and the secondary signal output terminal of described control switching circuit connects the control input end of described second communicating circuit; First communication signal input end of described first communicating circuit is all connected the signal input pin of described serial ports with the first communication signal input end of described second communicating circuit; First communication signal output terminal of described first communicating circuit is all connected the signal output pin of described serial ports with the first communication signal output terminal of described second communicating circuit; Second communication signal output terminal of described first communicating circuit connects the control signal input end of a described MCU, and the second communication signal input end of described first communicating circuit connects the control signal output terminal of a described MCU; Second communication signal output terminal of described second communicating circuit connects the control signal input end of described 2nd MCU, and the second communication signal input end of described second communicating circuit connects the control signal output terminal of described 2nd MCU; Wherein, the Opportunity awaiting control for linear signal output part of a described MCU exports high level, the output low level when a described MCU is standby when a described MCU job; Wherein, described serial ports is connected with computer by data line; Described computer is for controlling the switching on and shutting down of described display device.
Compared with prior art, the technical scheme that the embodiment of the present application provides, the technique effect had or advantage are: in two MCU control switching circuits that the embodiment of the present application proposes, the input signal of control switching circuit is provided by the Opportunity awaiting control for linear signal of a MCU, in a MCU job or when not working, this Opportunity awaiting control for linear signal corresponds to high level or low level, makes two of control switching circuit signal output parts export two kinds of different control signals and controls the first communicating circuit and the second communicating circuit respectively; During the one MCU work, the level that two signal output parts of control switching circuit export makes the first communicating circuit become path respectively, and the second communicating circuit disconnects, when one MC does not work, the level that volume two signal output parts of control switching circuit export makes the first communicating circuit disconnect respectively, and the second communicating circuit becomes path.By the change of the Opportunity awaiting control for linear signal of a MUC, make the path disconnection all the time of the first communicating circuit and the second communicating circuit, ensure a MCU and the 2nd MCU not being connected on communication line, also namely ensure that the data-signal of a MCU or the 2nd MCU can not return is poured on a 2nd MCU or MCU, when having solved MCU device two by serial ports control in technology, the feedback signal of existence has returned the technical matters of filling.
Accompanying drawing explanation
Fig. 1 is the circuit framework figure of the two MCU business television of conputer controlled in prior art;
Fig. 2 is the circuit block diagram of two MCU control switching circuits that the embodiment of the present application proposes;
Fig. 3 is the circuit diagram that the application implements the control switching circuit proposed;
Fig. 4 is the circuit diagram of the first communicating circuit that the embodiment of the present application proposes;
Fig. 5 is the circuit diagram of the second communicating circuit that the embodiment of the present application proposes.
Embodiment
The embodiment of the present application is by proposing two MCU control switching circuit, and when controlling two MCU device by serial ports to have solved in technology, the feedback signal of existence returns the technical matters of filling; By increasing control switching circuit, the first communicating circuit and the second communicating circuit between serial ports and two MCU, use the input control signal of Opportunity awaiting control for linear signal as control switching circuit of a MCU, by the control signal that change generation control first communicating circuit and second communicating circuit of the Opportunity awaiting control for linear signal of a MCU lead to and break, control two communicating circuits logical end at one time, ensure two communicating circuit not connecting on communication line, make, between two MCU, the problem that feedback signal returns filling to occur.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
As shown in Figure 2, be the circuit frame figure of two MCU control switching circuits that the embodiment of the present application proposes, comprise a MCU21, the 2nd MCU22, control switching circuit 23, first communicating circuit 24, second communicating circuit 25 and serial ports 26.
The Opportunity awaiting control for linear signal output part Standby of signal input part connection control the one MCU21 of control switching circuit 23, first signal output part O1 of control switching circuit 23 connects the control input end of the first communicating circuit 24, and the secondary signal output terminal O2 of control switching circuit 23 connects the control input end of the second communicating circuit 25.
First communication signal input end In11 of the first communicating circuit 24 is connected the signal input pin DATA_IN of serial ports 26 with the first communication signal input end In21 of the second communicating circuit 25; First communication signal output terminal Out11 of the first communicating circuit 24 is connected the signal output pin DATA_OUT of serial ports 26 with the first communication signal output terminal Out21 of the second communicating circuit 25.
Second communication signal output terminal Out12 of the first communicating circuit 24 connects the control signal input end MCU1_in of a MCU21, and the second communication signal input end In12 of the first communicating circuit 24 connects the control signal output terminal MCU1_out of a MCU21;
Second communication signal output terminal Out22 of the second communicating circuit 25 connects the control signal input end MCU2_in of the 2nd MCU22, and the second communication signal input end In22 of the second communicating circuit 25 connects the control signal output terminal MCU2_out of the 2nd MCU22.
Wherein, the Opportunity awaiting control for linear signal output part Standby of a MCU21 exports high level, the output low level when a MCU21 is standby when a MCU21 job.
During the one MCU21 work, Opportunity awaiting control for linear signal output part Standby exports high level, then the first signal output part O1 of control switching circuit 23 exports high level signal, and secondary signal output terminal O2 output low level signal, then the control input end CTL1 of the first communicating circuit 24 is high-level control signal, and the control input end CTL2 of the second communicating circuit 25 is low level control signal.
The control signal CTL1 of high level controls the first communicating circuit 24 becomes path; Concrete, make the second communication signal input end In12 of a MCU21 and the first communication signal input end In11 be connected to become path, make the second communication signal output terminal Out12 of a MCU21 and the first communication signal output terminal Out11 become path.It is open circuit that low level control signal CTL2 controls the second communicating circuit 25; Concrete, the second communication signal input end In22 of the 2nd MCU22 is not connected with the first communication signal input end In21, the second communication signal output terminal Out22 of the 2nd MCU22 is not connected with the first communication signal output terminal Out21.
Then, when a MCU21 job, first communicating circuit 24 ensures to keep path between a MCU21 and serial ports 26, it is open circuit between second communicating circuit 25 and serial ports 26, the data then entered from the data-signal input pin DATA_IN of serial ports 26 can be received by the control signal input end MCU1_in of a MCU21, and the data that the control signal output terminal MCU1_out of a MCU21 exports can export from the data output pins DATA_OUT of serial ports 26; Meanwhile, due between the second communicating circuit 25 and serial ports 26 for open circuit, the data on the data output pins of serial ports 26 and data-out pin cannot be returned and be poured on the 2nd MCU22.
When one MCU21 does not work, Opportunity awaiting control for linear signal output part Standby output low level, then the first signal output part O1 output low level signal of control switching circuit 23, and secondary signal output terminal O2 exports high level signal, then the control input end CTL1 of the first communicating circuit 24 is low level control signal, and the control input end CTL2 of the second communicating circuit 25 is high-level control signal.
Low level control signal CTL1 controls the first communicating circuit 24 becomes open circuit; Concrete, the second communication signal input end In12 of a MCU21 is not connected with the first communication signal input end In11, the second communication signal output terminal Out12 of a MCU21 is not connected with the first communication signal output terminal Out11.The control signal CTL2 of high level controls the second communicating circuit 25, and to become path concrete, the second communication signal input end In22 of the 2nd MCU22 is connected with the first communication signal input end In21 for path, the second communication signal output terminal Out22 of the 2nd MCU22 is connected with the first communication signal output terminal Out21 for path.
Then, when a MCU21 does not work, second communicating circuit 25 ensures to keep path between the 2nd MCU22 and serial ports 26, it is open circuit between first communicating circuit 24 and serial ports 26, the data then entered from the data-signal input pin DATA_IN of serial ports 26 can be received by the control signal input end MCU2_in of the 2nd MCU22, and the data that the control signal output terminal MCU2_out of the 2nd MCU22 exports can export from the data output pins DATA_OUT of serial ports 26; Meanwhile, due between the first communicating circuit 24 and serial ports 26 for open circuit, the data on the data output pins of serial ports 26 and data-out pin cannot be returned and be poured on a MCU21.
In two MCU control switching circuits of above-mentioned proposition, the input signal of control switching circuit is provided by the Opportunity awaiting control for linear signal of a MCU, in a MCU job or when not working, this Opportunity awaiting control for linear signal corresponds to high level or low level, makes two of control switching circuit signal output parts export two kinds of different control signals and controls the first communicating circuit and the second communicating circuit respectively; During the one MCU work, the level that two signal output parts of control switching circuit export makes the first communicating circuit become path respectively, and the second communicating circuit disconnects, when one MC does not work, the level that volume two signal output parts of control switching circuit export makes the first communicating circuit disconnect respectively, and the second communicating circuit becomes path.By the change of the Opportunity awaiting control for linear signal of a MUC, make the path disconnection all the time of the first communicating circuit and the second communicating circuit, ensure a MCU and the 2nd MCU not being connected on communication line, also namely ensure that the data-signal of a MCU or the 2nd MCU can not return is poured on a 2nd MCU or MCU, when having solved MCU device two by serial ports control in technology, the feedback signal of existence has returned the technical matters of filling.
Above-mentioned control switching circuit 23, first communicating circuit 24 and the second communicating circuit 25, all can adopt circuit realiration of the prior art, the embodiment of the present application will not limit.
As shown in Fig. 3, Fig. 4 and Fig. 5, the circuit diagram of the control switching circuit of the concrete two MCU control switching circuits proposed for the embodiment of the present application, the first communicating circuit and the second communicating circuit.
Wherein, as shown in Figure 3, control switching circuit 23 comprises the first switching tube Q1 and second switch pipe Q2; The Opportunity awaiting control for linear signal output part Standby of the one MCU21 connects the first input end of the first switching tube Q1, second input end of the first switching tube Q1 connects the secondary signal output terminal O2 of working power VCC and control switching circuit, the output head grounding of the first switching tube Q1 respectively; The first input end of second switch pipe Q2 connects the secondary signal output terminal O2 of control switching circuit, second input end of second switch pipe Q2 connects the first signal output part O1 of working power VCC and control switching circuit, the output head grounding of second switch pipe Q2 respectively.
First switching tube Q1 and/or second switch pipe Q2 can be NPN triode, also can be NMOS field effect transistor; During for NPN triode, the first input end of the first switching tube Q1 and/or second switch pipe Q2 is the base stage of NPN triode, second input end of the first switching tube Q1 and/or second switch pipe Q2 is the collector of NPN triode, and the output terminal of the first switching tube Q1 and/or second switch pipe Q2 is the emitter of NPN triode.During for NMOS field effect transistor, the first input end of the first switching tube Q1 and/or second switch pipe Q2 is the grid of NMOS field effect transistor, second input end of the first switching tube Q1 and/or second switch pipe Q2 is the source electrode of NMOS field effect transistor, and the output terminal of the first switching tube Q1 and/or second switch pipe Q2 is the drain electrode of NMOS field effect transistor.
As shown in Figure 4, the first communicating circuit 24 comprises the 3rd switching tube Q3 and the 4th switching tube Q4; First input end and the first input end of the 4th switching tube Q4 of the 3rd switching tube Q3 are all connected the first signal output part O1 of control switching circuit; Second input end of the 3rd switching tube Q3 connects the control signal output terminal MCU1_out of a MCU21, and the output terminal of the 3rd switching tube Q3 connects the signal output pin DATA_OUT of serial ports 26; Second input end of the 4th switching tube Q4 connects the control signal input end MCU1_in of a MCU21, and the output terminal of the 4th switching tube Q4 connects the signal input pin DATA_IN of serial ports 26.
As shown in Figure 5, the second communicating circuit 25 comprises the 5th switching tube Q5 and the 6th switching tube Q6; First input end and the first input end of the 6th switching tube Q6 of the 5th switching tube Q5 are all connected the secondary signal output terminal O2 of control switching circuit; Second input end of the 5th switching tube Q5 connects the control signal output terminal MCU2_out of the 2nd MCU22, and the output terminal of the 5th switching tube Q5 connects the signal output pin DATA_OUT of serial ports 26; Second input end of the 6th switching tube Q 6 connects the control signal input end MCU1_in of the 2nd MCU22, and the output terminal of the 6th switching tube Q 6 connects the signal input pin DATA_IN of serial ports 26.
Four switching tubes Q3, Q4, Q5 and Q6 in first communicating circuit 24 and the second communicating circuit 25 preferably use NMOS field effect transistor; When for NMOS field effect transistor, the first input end of four switching tubes is the grid of NMOS field effect transistor, and the second input end is the source electrode of NMOS field effect transistor, and output terminal is the drain electrode of NMOS field effect transistor.
With the 3rd switching tube Q3 and the 4th switching tube Q4 for NPN triode, the 5th switching tube Q5 and the 6th switching tube Q6 is NMOS field effect transistor is example.
When a MCU21 job, Opportunity awaiting control for linear signal output part Standby exports high level, then the 3rd switching tube Q3 conducting, thus secondary signal output terminal O2 output low level signal gives the second communicating circuit 25, and the 4th switching tube Q4 is ended, thus the first signal output part O1 exports high level signal to the first communicating circuit 24.
The control signal CTL1 of high level controls the 3rd switching tube Q3 in the first communicating circuit 24 and the 4th switching tube Q4 conducting, makes the first communicating circuit 24 become path, ensures the communication between a MCU21 and serial ports 26; And low level control signal CTL2 controls the 5th switching tube Q5 in the second communicating circuit 25 and the 6th switching tube Q6 and ends, second is made logically to select circuit 25 to be open circuits, cannot communication between the 2nd MCU22 and serial ports 26.
When one MCU21 does not work, Opportunity awaiting control for linear signal output part Standby output low level, then the 3rd switching tube Q3 ends, thus secondary signal output terminal O2 exports high level signal to the second communicating circuit 25, and make the 4th switching tube Q4 conducting, thus the first signal output part O1 output low level signal gives the first communicating circuit 24.
Low level control signal CTL1 controls the 3rd switching tube Q3 in the first communicating circuit 24 and the 4th switching tube Q4 to be ended, and makes the first communicating circuit 24 become open circuit, cannot realize communication between a MCU21 and serial ports 26; And the control signal CTL2 of high level controls the 5th switching tube Q5 in the second communicating circuit 25 and the 6th switching tube Q6 conducting, make second logically to select circuit 25 to become path, ensure the communication between the 2nd MCU22 and serial ports 26.
Visible, when a MCU21 job, first communicating circuit 24 ensures to keep path between a MCU21 and serial ports 26, it is open circuit between second communicating circuit 25 and serial ports 26, the data then entered from the data-signal input pin DATA_IN of serial ports 26 can be received by the control signal input end MCU1_in of a MCU21, and the data that the control signal output terminal MCU1_out of a MCU21 exports can export from the data output pins DATA_OUT of serial ports 26; Meanwhile, due between the second communicating circuit 25 and serial ports 26 for open circuit, the data on the data output pins of serial ports 26 and data-out pin cannot be returned and be poured on the 2nd MCU22.When a MCU21 does not work, second communicating circuit 25 ensures to keep path between the 2nd MCU22 and serial ports 26, it is open circuit between first communicating circuit 24 and serial ports 26, the data then entered from the data-signal input pin DATA_IN of serial ports 26 can be received by the control signal input end MCU2_in of the 2nd MCU22, and the data that the control signal output terminal MCU2_out of the 2nd MCU22 exports can export from the data output pins DATA_OUT of serial ports 26; Meanwhile, due between the first communicating circuit 24 and serial ports 26 for open circuit, the data on the data output pins of serial ports 26 and data-out pin cannot be returned and be poured on a MCU21.
Based on above-mentioned two MCU control switching circuits, the embodiment of the present application also proposes a kind of display device, and this display device possesses above-mentioned two MCU control switching circuits, wherein, one MCU can be the master chip of display device, and the 2nd MCU can be the standby chip of display device; Display device, such as LCD TV, be connected by opertaing devices such as serial ports connection data line and computers, and the opertaing devices such as computer can realize controlling the switching on and shutting down of display device by serial ports.
Concrete, when display device normally works, master chip works, the Opportunity awaiting control for linear signal of master chip is high level, this high level makes control switching circuit export a high level to control the first communicating circuit and become path, and also exporting low level control second communicating circuit becomes open circuit, and computer now can send the control signal of shutdown to master chip by serial ports, and due to the second communicating circuit be open circuit, the postboost feedback signal of master chip cannot be returned and be poured on standby chip; After display device shutdown, standby chip operation, and the Opportunity awaiting control for linear signal of master chip is low level, this low level makes control switching circuit export low level control first communicating circuit becomes open circuit, also an output high level controls the second communicating circuit is path, computer now can send the firm standby chip of control signal of start by serial ports, and due to the first communicating circuit be open circuit, the feedback signal after standby chip performs start cannot be returned and be poured on master chip.
Two MCU control switching circuit that the embodiment of the present application proposes and display device, control switching circuit is increased between serial ports and two chips, first communicating circuit and the second communicating circuit, utilize the input control signal of Opportunity awaiting control for linear voltage as control switching circuit of one of them chip, the first communicating circuit and the second communicating circuit is controlled in the same working time by control switching circuit, keep the open circuit of a path, thus while ensureing serial ports and one of them chip communication, communication signal can not return and be poured on another chip, the signal existed under solving two MCU situation returns the technical matters of filling.
It should be noted that; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing; the change that those skilled in the art make in essential scope of the present utility model, modification, interpolation or replacement, also should belong to protection domain of the present utility model.
Claims (9)
1. a two MCU control switching circuit, comprise a MCU and the 2nd MCU, it is characterized in that, described pair of MCU control switching circuit also comprises serial ports, control switching circuit, the first communicating circuit and the second communicating circuit;
The Opportunity awaiting control for linear signal output part of a MCU described in the signal input part connection control of described control switching circuit, first signal output part of described control switching circuit connects the control input end of described first communicating circuit, and the secondary signal output terminal of described control switching circuit connects the control input end of described second communicating circuit;
First communication signal input end of described first communicating circuit is all connected the signal input pin of described serial ports with the first communication signal input end of described second communicating circuit; First communication signal output terminal of described first communicating circuit is all connected the signal output pin of described serial ports with the first communication signal output terminal of described second communicating circuit;
Second communication signal output terminal of described first communicating circuit connects the control signal input end of a described MCU, and the second communication signal input end of described first communicating circuit connects the control signal output terminal of a described MCU;
Second communication signal output terminal of described second communicating circuit connects the control signal input end of described 2nd MCU, and the second communication signal input end of described second communicating circuit connects the control signal output terminal of described 2nd MCU;
Wherein, the Opportunity awaiting control for linear signal output part of a described MCU exports high level, the output low level when a described MCU is standby when a described MCU job.
2. according to claim 1 pair of MCU control switching circuit, is characterized in that, described control switching circuit comprises the first switching tube and second switch pipe; The Opportunity awaiting control for linear signal output part of a described MCU connects the first input end of described first switching tube, second input end of described first switching tube connects the secondary signal output terminal of working power and described control switching circuit respectively, the output head grounding of described first switching tube; The first input end of described second switch pipe connects the secondary signal output terminal of described control switching circuit, second input end of described second switch pipe connects the first signal output part of described working power and described control switching circuit respectively, the output head grounding of described second switch pipe.
3. according to claim 2 pair of MCU control switching circuit, is characterized in that, described first switching tube and/or described second switch pipe are NPN triode; The first input end of described first switching tube and/or described second switch pipe is the base stage of NPN triode, second input end of described first switching tube and/or described second switch pipe is the collector of NPN triode, and the output terminal of described first switching tube and/or described second switch pipe is the emitter of NPN triode.
4. according to claim 2 pair of MCU control switching circuit, is characterized in that, described first switching tube and/or described second switch pipe are NMOS field effect transistor; The first input end of described first switching tube and/or described second switch pipe is the grid of NMOS field effect transistor, second input end of described first switching tube and/or described second switch pipe is the source electrode of NMOS field effect transistor, and the output terminal of described first switching tube and/or described second switch pipe is the drain electrode of NMOS field effect transistor.
5. according to claim 1 pair of MCU control switching circuit, is characterized in that, described first communicating circuit comprises the 3rd switching tube and the 4th switching tube; First input end and the first input end of described 4th switching tube of described 3rd switching tube are all connected the first signal output part of described control switching circuit; Second input end of described 3rd switching tube connects the control signal output terminal of a described MCU, and the output terminal of described 3rd switching tube connects the signal output pin of described serial ports; Second input end of described 4th switching tube connects the control signal input end of a described MCU, and the output terminal of described 4th switching tube connects the signal input pin of described serial ports.
6. according to claim 1 pair of MCU control switching circuit, is characterized in that, described second communicating circuit comprises the 5th switching tube and the 6th switching tube; First input end and the first input end of described 6th switching tube of described 5th switching tube are all connected the secondary signal output terminal of described control switching circuit; Second input end of described 5th switching tube connects the control signal output terminal of described 2nd MCU, and the output terminal of described 5th switching tube connects the signal output pin of described serial ports; Second input end of described 6th switching tube connects the control signal input end of described 2nd MCU, and the output terminal of described 6th switching tube connects the signal input pin of described serial ports.
7. according to claim 5 pair of MCU control switching circuit, is characterized in that, described 3rd switching tube and described 4th switching tube are NMOS field effect transistor; Wherein, the first input end of described 3rd switching tube and described 4th switching tube is the grid of NMOS field effect transistor, second input end of described 3rd switching tube and described 4th switching tube is the source electrode of NMOS field effect transistor, and the output terminal of described 3rd switching tube and described 4th switching tube is the drain electrode of NMOS field effect transistor.
8. according to claim 6 pair of MCU control switching circuit, is characterized in that, described 5th switching tube and described 6th switching tube are NMOS field effect transistor; Wherein, the first input end of described 5th switching tube and described 6th switching tube is the grid of NMOS field effect transistor, second input end of described 5th switching tube and described 6th switching tube is the source electrode of NMOS field effect transistor, and the output terminal of described 5th switching tube and described 6th switching tube is the drain electrode of NMOS field effect transistor.
9. a display device, is characterized in that, comprises the two MCU control switching circuits as described in any one of claim 1-8 claim; Wherein, described serial ports is connected with computer by data line; Described computer is for controlling the switching on and shutting down of described display device.
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| CN201520195733.5U CN204496230U (en) | 2015-04-02 | 2015-04-02 | A kind of two MCU control switching circuit and display device |
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| CN201520195733.5U CN204496230U (en) | 2015-04-02 | 2015-04-02 | A kind of two MCU control switching circuit and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114826796A (en) * | 2022-06-29 | 2022-07-29 | 京东方艺云(杭州)科技有限公司 | Power supply switching circuit of dual-communication module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114826796A (en) * | 2022-06-29 | 2022-07-29 | 京东方艺云(杭州)科技有限公司 | Power supply switching circuit of dual-communication module |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |