CN206962955U - USB multiplexing control circuit - Google Patents
USB multiplexing control circuit Download PDFInfo
- Publication number
- CN206962955U CN206962955U CN201720295952.XU CN201720295952U CN206962955U CN 206962955 U CN206962955 U CN 206962955U CN 201720295952 U CN201720295952 U CN 201720295952U CN 206962955 U CN206962955 U CN 206962955U
- Authority
- CN
- China
- Prior art keywords
- pin
- nmos tube
- hdmi ports
- master chip
- usb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Debugging And Monitoring (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
It the utility model is related to the USB multiplexing control circuit technology of flat panel TV.The utility model solves the communication function that USB is influenceed during current HDMI uses, the problem of so as to influence movement scheduling and planning, there is provided a kind of USB multiplexing control circuit, its technical scheme can be summarized as：Including HDMI ports and TV master chip, it is characterised in that also connect TV master chip by controlling switch circuit including controlling switch circuit, the HDMI ports.The beneficial effects of the utility model are TV system software state can be monitored and be debugged by the USB port on mainboard using computer using while HDMI equipment, suitable for flat panel TV when movement is debugged.
Description
Technical field
It the utility model is related to the USB multiplexing control circuit of flat panel TV technology, more particularly to flat panel TV
Technology.
Background technology
Flat panel TV has benefited from increasing income for Android system, and arriving in recent years develops rapidly, flat-panel television performance and work(
It can make rapid progress., it is necessary to which software systems are monitored and debugged using PC, in PC in flat panel TV exploitation and production process
The current main flow of serial communication between TV uses USB port, i.e. UART, and full-duplex communication can be achieved.
Flat panel TV has UART private ports, but TV in order to save the beautification of cost and outward appearance, typically on mainboard
Complete machine does not retain special UART external-connected ports.Due to analyzing the needs such as tv fault after sale, UART needs to be multiplexed with external-connected port.
Particularly UART and HDMI multiplexed ports are in the majority, and UART is multiplexed HDMI the unsettled pin and grounding leg.If multiplexing UART with
Mainboard UART sockets use same group of data line to TV master chip, then during movement scheduling and planning, use
HDMI functions, then UART data wires level will be dragged down by HDMI equipment, cause serial communication abnormal, can not debug.
Utility model content
The purpose of this utility model is the communication function of influence USB during the current HDMI uses of solution, from
A kind of and the problem of influenceing movement scheduling and planning, there is provided USB multiplexing control circuit.
The utility model solves its technical problem, and the technical scheme of use is：USB multiplexing control circuit, bag
Include HDMI ports and TV master chip, it is characterised in that also pass through controlling switch including controlling switch circuit, the HDMI ports
Circuit connects TV master chip.
It is further that the controlling switch circuit includes controlling switch module, switch one and switch two, controlling switch mould
One end of block is connected with the 18th pin of HDMI ports, and the other end is connected with switch one and switch two respectively, HDMI ports
Second pin is connected by switch one with the reception FPDP of TV master chip, and the 14th pin of HDMI ports passes through switch
Two are connected with the data pin of just receiving of TV master chip.
It is further that the HDMI ports are the USB port of the multiplexing of TV used.
It is further that the controlling switch circuit includes first resistor, second resistance ,+12V power supplys, ground wire, first
NMOS tube, the second NMOS tube and the 3rd NMOS tube, the 18th pin of one end connection HDMI ports of the first resistor, this draws
Pin is+5V pins, and the other end connects the grid of the first NMOS tube, the source electrode connection ground wire of the first NMOS tube, drain electrode connection second
One end of resistance, the other end connection+12V power supplys of second resistance, the grid of the second NMOS tube connect the drain electrode of the first NMOS tube,
The second pin of source electrode connection HDMI ports, the transmission data pin of drain electrode connection TV master chip, the grid of the 3rd NMOS tube
The drain electrode of the first NMOS tube, the 14th pin of drain electrode connection HDMI ports are connected, source electrode connects the reception number of TV master chip
According to pin.
The beneficial effects of the utility model are, by above-mentioned USB multiplexing control circuit, can be debugged in movement
When, TV system software state is entered by the USB port on mainboard using computer using while HDMI equipment
Row monitoring and debugging.
Brief description of the drawings
Fig. 1 is embodiment circuit structure diagram.
Wherein R1 is first resistor, and R2 is second resistance, and Q1 is the first NMOS tube, and Q2 is the second NMOS tube, and Q3 is the 3rd
NMOS tube, UART-TX be TV master chip transmission data pin, UART-RX be TV master chip reception data pin, 2
For the second pin of HDMI ports, 2 it is the 5th pin of HDMI ports, 8 is the 8th pin of HDMI ports, 11 is HDMI ports
The 11st pin, 14 be HDMI ports the 14th pin, 17 be the 17th pin of HDMI ports, 20 be HDMI ports
20th pin, 21 be the 21st pin of HDMI ports, 22 be HDMI ports the 22nd pin, 23 be HDMI ports
The 23rd pin.
Embodiment
Below in conjunction with the accompanying drawings and embodiment, the technical solution of the utility model is described in detail.
USB multiplexing control circuit described in the utility model is by HDMI ports, TV master chip and controlling switch
Circuit forms, wherein, HDMI ports connect TV master chip by controlling switch circuit.Here, it is multiple when HDMI equipment is not used
External USB port is that HDMI ports can be used, and special USB port can also make on mainboard
With during using HDMI equipment, controlling switch circuit controls external USB port to disconnect, and avoids influenceing special on mainboard
USB port correlation function, USB port can normal use on mainboard.
Embodiment
USB multiplexing control circuit includes HDMI ports, TV master in the utility model embodiment flat panel TV
Chip and controlling switch circuit, wherein, HDMI ports connect TV master chip by controlling switch circuit.
In foregoing circuit, controlling switch circuit includes controlling switch module, switchs one and switch two, and in this example, control is opened
Closing module includes first resistor R1, second resistance R2 ,+12V power supply, ground wire and the first NMOS tube Q1, and switch one is the 2nd NMOS
Pipe Q2, switch three is the 3rd NMOS tube Q3, wherein, the 18th pin of first resistor R1 one end connection HDMI ports is another
The first NMOS tube Q1 of end connection grid, the first NMOS tube Q1 source electrode connection ground wire, drain electrode connection second resistance R2 one end,
Second resistance R2 other end connection+12V power supplys, the second NMOS tube Q2 grid connect the first NMOS tube Q1 drain electrode, source electrode
The second pin of HDMI ports is connected, drain electrode connects the transmission data pin UART-TX of TV master chip, the 3rd NMOS tube Q3's
Grid connects the first NMOS tube Q1 drain electrode, the 14th pin of drain electrode connection HDMI ports, and source electrode connects TV master chip
Receive data pin UART-RX.
HDMI ports are the USB port of the multiplexing of TV used.
5th pin of HDMI ports, the 8th pin, the 11st pin, the 17th pin, the 20th pin, the 21st
Pin, the 22nd pin and the 23rd pin are all connected with ground wire.
Claims (4)
1. USB multiplexing control circuit, including HDMI ports and TV master chip, it is characterised in that also include control
On-off circuit, the HDMI ports are connected by controlling switch circuit with TV master chip.
2. USB multiplexing control circuit according to claim 1, it is characterised in that the controlling switch circuit
Including controlling switch module, switch one and switch two, one end of controlling switch module is connected with the 18th pin of HDMI ports,
The other end is connected with switch one and switch two respectively, and the second pin of HDMI ports passes through the reception of switch one and TV master chip
FPDP is connected, and the 14th pin of HDMI ports is connected by switch two with the data pin of just receiving of TV master chip.
3. USB multiplexing control circuit according to claim 1 or 2, it is characterised in that the HDMI ports
For the USB port of the multiplexing of TV used.
4. USB multiplexing control circuit according to claim 1, it is characterised in that the controlling switch circuit
Including first resistor, second resistance ,+12V power supplys, ground wire, the first NMOS tube, the second NMOS tube and the 3rd NMOS tube, described
18th pin of one end connection HDMI ports of one resistance, the other end connect the grid of the first NMOS tube, the first NMOS tube
Source electrode connects ground wire, the one end for the connection second resistance that drains, the other end connection+12V power supplys of second resistance, the second NMOS tube
Grid connects the drain electrode of the first NMOS tube, the second pin of source electrode connection HDMI ports, the transmission of drain electrode connection TV master chip
Data pin, the grid of the 3rd NMOS tube connect the drain electrode of the first NMOS tube, the 14th pin of drain electrode connection HDMI ports, source
Pole connects the reception data pin of TV master chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295952.XU CN206962955U (en) | 2017-03-24 | 2017-03-24 | USB multiplexing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295952.XU CN206962955U (en) | 2017-03-24 | 2017-03-24 | USB multiplexing control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206962955U true CN206962955U (en) | 2018-02-02 |
Family
ID=61377341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720295952.XU Active CN206962955U (en) | 2017-03-24 | 2017-03-24 | USB multiplexing control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206962955U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062185A (en) * | 2019-04-19 | 2019-07-26 | 北京灵优智学科技有限公司 | A kind of interface circuit |
| CN114927114A (en) * | 2022-06-29 | 2022-08-19 | 高创(苏州)电子有限公司 | Display device input circuit, display device and control method thereof |
-
2017
- 2017-03-24 CN CN201720295952.XU patent/CN206962955U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062185A (en) * | 2019-04-19 | 2019-07-26 | 北京灵优智学科技有限公司 | A kind of interface circuit |
| CN114927114A (en) * | 2022-06-29 | 2022-08-19 | 高创(苏州)电子有限公司 | Display device input circuit, display device and control method thereof |
| CN114927114B (en) * | 2022-06-29 | 2024-04-09 | 高创(苏州)电子有限公司 | Display device input circuit, display device and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206962955U (en) | USB multiplexing control circuit | |
| CN104239176A (en) | Multi-user multi-target remote JTAG debugging system based on Internet | |
| CN205318363U (en) | Intelligent terminal double -screen display device | |
| CN203786242U (en) | Portable multifunctional interface cable test device | |
| CN203761526U (en) | Television online programming circuit | |
| CN202443081U (en) | Self-adaptive burn testing device with monitoring function for input/output plug-in boards | |
| CN203084716U (en) | Adapter plate based on solid-state hard disk | |
| CN104882926A (en) | Charging indicating circuit and mobile terminal | |
| CN106569572B (en) | Mainboard and computerized control system with the mainboard | |
| CN201425723Y (en) | Switch of dual hard disk power lines | |
| CN104052160B (en) | The harvester of power equipment data and method | |
| CN103686146B (en) | A kind of on-line fault diagnosis device and method | |
| CN105242757A (en) | Connection structure of tablet personal computer and base | |
| CN202093391U (en) | Multifunctional digital signal input card | |
| CN204695300U (en) | A kind of computer software testing device | |
| CN203012061U (en) | An automatic switching apparatus used for multiple paths of direct-current circuits | |
| CN204697180U (en) | Chip main board and television set | |
| CN204515160U (en) | Offshore shooting instrument towing cable DC constant current power supply is powered and is gone up electric system step by step | |
| CN104932998A (en) | Mainboard | |
| CN208589015U (en) | A kind of server fault diagnosis plate | |
| CN208444285U (en) | Electronic device for equipment identification and equipment identification system | |
| CN102722232A (en) | Control system and method for electrifying ATCA (advanced telecom computing architecture) blade | |
| CN106226691A (en) | A kind of test equipment for relay | |
| CN206788850U (en) | A kind of computer input device connector | |
| CN204790706U (en) | Touch all -in -one external device's control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |