CN110062185A - A kind of interface circuit - Google Patents
A kind of interface circuit Download PDFInfo
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- CN110062185A CN110062185A CN201910319522.0A CN201910319522A CN110062185A CN 110062185 A CN110062185 A CN 110062185A CN 201910319522 A CN201910319522 A CN 201910319522A CN 110062185 A CN110062185 A CN 110062185A
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- Prior art keywords
- hdmi
- data
- module
- interface
- urat
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
Abstract
The embodiment of the invention provides a kind of interface circuits, comprising: main scheme module, for obtaining high-definition media interface HDMI data and asynchronous receiving-transmitting transmitter URAT data；Data conversion module, the HDMI data and the URAT data for sending the main scheme module are merged into the same output channel；Self-adaptive control module, for switching the output mode of the output channel；HDMI interface module, for receiving the corresponding data of the output mode.Use HDMI interface as URAT debugging interface, in the case where not influencing using HDMI HW High Way original function, realizes URAT communication interface function, the function of software debugging and system upgrade maintenance can be directly realized by HDMI interface.
Description
Technical field
The present invention relates to HDMI technical fields, more particularly to a kind of interface circuit.
Background technique
Android system product is in research and development debugging process, in order to increase hardware function and software function module, needs
It to use URAT to be debugged in each system layer addition code, and obtain product kernel, print tune-up data；In the aging of product
Test process, need to enroll constantly Android kernel data carry out analysis study and judge, positioning problems and optimization system bug.Due to producing
The limitation of product design needs to tear product open repeatedly during researching and developing debugging, burn-in test, after-sales service upgrading
Machine just can connect to URAT and be debugged.Larger for size and complicated product tears chance open repeatedly and causes display screen
The problems such as damage, causes the very big inconvenience of product up-gradation.
Currently, solution is to realize that HDMI interface converts URAT interface using transistor, pass through HDMI interface
Connect URAT, but the turn-on time of transistor PN junction, shut-in time, rising edge and failing edge time and conducting delay time
Equal key parameters are the important factor in order of URAT communication transfer process, above-mentioned parameter it is unstable be easy to produce data packetloss and
The problems such as communicating Wave anomaly will cause infull data recording, messy code and the input not congruent problem of information in maintenance upgrade.
Summary of the invention
In view of the above problems, it proposes the embodiment of the present invention and overcomes the above problem or at least partly in order to provide one kind
A kind of interface circuit to solve the above problems.
To solve the above-mentioned problems, the embodiment of the invention discloses a kind of interface circuits, comprising:
Main scheme module, for obtaining high-definition media interface HDMI data and asynchronous receiving-transmitting transmitter URAT data；
Data conversion module, the HDMI data for sending the main scheme module merge with the URAT data
To the same output channel；
Self-adaptive control module, for switching the output mode of the output channel；
HDMI interface module, for receiving the corresponding data of the output mode.
Further, the data conversion module include: the first input end being connect with the main scheme module, it is second defeated
Enter end, and the first output end connecting with the HDMI interface module；
The main scheme module, for the URAT data to be sent to the first input end of the data conversion module,
And the HDMI data are sent to the second input terminal of the data conversion module；
Data conversion module is also used to receive the output mode instruction that the self-adaptive control module is sent, and, it will be with
The output mode instructs corresponding target data to be sent to the HDMI interface module by first output end.
Further, the self-adaptive control module is also used to be set as defaulting by the output mode of first output end
Output mode；
Under the default output mode, the URAT data are sent to the HDMI interface mould by first output end
Block.
Further, the self-adaptive control module include mode state convert resistance, it is scheme control convert resistance, adaptive
Answer mode controller, shunt resistance and for electric diode；
The input terminal for electric diode is connect with the HPD interface in the HDM interface module, described for electric diode
Output end connect with scheme control convert resistance one end；
The base stage of the adaptive model controller connect with the scheme control convert resistance other end, collector and institute
State the connection of mode state convert resistance one end, emitter ground connection；
Described shunt resistance one end connect with the base stage of the adaptive model controller, the other end and the adaptive mode
The emitter of formula controller connects；
The second output terminal of the data conversion module and the mode state convert resistance, the adaptive model control
The collector of device connects.
Further, the first input end includes the end URAT-TX and the end URAT-RX, and second input terminal includes
The end HDMI-SDA and the end HDMI-SCL, first output end include the first output channel and the second output channel, the HDMI
Interface module includes the first end I2C and the 2nd end I2C, and the first end I2C is connect with first output channel, and described second
The end I2C is connect with second output channel；
First output channel, for the end URAT-TX or the received data in the end HDMI-SDA to be sent to
First end I2C；
Second output channel, for the end URAT-RX or the received data in the end HDMI-SCL to be sent to
2nd end I2C.
Further, the adaptive model controller is NPN type triode.
Further, the HDMI interface module is A type HDMI interface.
Further, the resistance value of the mode state convert resistance is 10 kilohms.
Further, the resistance value of the scheme control convert resistance is 1 kilohm.
Further, the data conversion module is analog switch BL1551.
The embodiment of the present invention includes following advantages: using HDMI interface as URAT debugging interface, is not influencing to use
In the case where HDMI HW High Way original function, realizes URAT communication interface function, can directly be realized by HDMI interface
Software debugging and the function of system upgrade maintenance.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of interface circuit embodiment of the invention.
101 main scheme modules, 200,201 first data conversion module of data conversion module, 202 second data conversion moulds
Block, 301 self-adaptive control modules, 401 HDMI interface modules, R1 mode state convert resistance, R2 scheme control convert resistance,
R3 shunt resistance, Q1 adaptive model controller, D1 is for electric diode
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
One of the core concepts of the embodiments of the present invention is, uses HDMI interface as URAT debugging interface, is not influencing
In the case where using HDMI HW High Way original function, realizes URAT communication interface function, directly pass through HDMI interface
Realize the function of software debugging and system upgrade maintenance.
Referring to Fig.1, a kind of schematic diagram of interface circuit embodiment of the invention is shown, comprising:
Main scheme module 101, for obtaining high-definition media interface HDMI data and asynchronous receiving-transmitting transmitter URAT data；
Data conversion module 200, the HDMI data for sending main scheme module 101 are merged into same with URAT data
A output channel；
Self-adaptive control module 301, for switching the output mode of output channel；
HDMI interface module 401, for receiving the corresponding data of output mode.
In embodiments of the present invention, used chip, main scheme module 101 when main scheme module 101 is product design
With two data port of HDMI-sink and HDMI-source, wherein the end HDMI-sink is signal receiving end, HDMI-
The end source is signal transmitting terminal, and HDMI (High Definition Multimedia Interface) is a kind of digital
Change video and sound transmission interface, unpressed audio and vision signal can be sent.HDMI interface module 401 has hot plug
(HPD) function is detected, HPD (Hotplug) is hot plug detection, and HPD is read as whether HDMI-sourc initiates EDID, EDID
(Extended DisplayIdentification Data) extending display identification data, if start to send TMDS signal
Foundation, TMDS (Transition Minimized Differential signal) minimize differential signal transmission.HPD be from
HDMI-sink is generated and is exported a detection signal for being sent to HDMI-sourc.The effect of hot plug detection is when display etc.
When the display equipment of HDMI interface is connected or is disconnected with HDMI-sourc by HDMI interface, HDMI-sourc can pass through
The HPD pin of HDMI detects this event, and responds.Display works as HDMI- by HDMI connection HDMI source equipment
(HPD is from low level to high electricity when sourc detects that display is connected with HDMI-sourc by the HPD pin of HDMI interface
It is flat), HDMI-sourc thinks there has been display equipment connection, and passes through the display data channel DDC in HDMI interface
It is stored in (Display Data Channel, be mainly used for the transmission of EDID and HDCP) reading display EDID memory
EDID data (expanded scope identification data), if detecting the operating mode range and the output of HDMI-sourc of display
Setting is adapted, then HDMI-sourc is activated by the normal HDMI signal of TMDS signal sending circuit transmission and gives display equipment.Institute
It is read when EDID with HDMI-sink is the conversion in HPD from low level to high level by the end HDMI Source.If needed
It forces to refresh EDID, a HPD signal (drag down HPD, then draw high HPD) can be initiated, make HDMI source new to read
EDID content.Display disconnect HDMI connection when, when HDMI-sourc by HPD pin detect display HDMI interface and
When HDMI-sourc is disconnected, HDMI-sourc just disconnects TMDS signal sending circuit, stops sending HDMI signal.The present invention will
URAT debugging interface is merged into HDMI interface, is connected using specific purpose tool plate, can get asynchronous receiving-transmitting transmitter URAT number
According to data conversion module 200 is used to for two kinds of data being merged into an output channel, and adaptation control circuit is for switching two
The output mode of kind of data switches the data of output, HDMI interface module when not influencing the original function of HDMI interface
Interface signal is transferred to self-adaptive control module 301 by 401, and self-adaptive control module 301 is cut by self-adaptive control module 301
Output mode is changed, which is the low and high level fed back using adaptation control circuit, and level information is fed back to data and is turned
Block is changed the mold, data conversion module receives above-mentioned output mode instruction, and instructs corresponding target data to send out above-mentioned output mode
It send to HDMI interface module 401, the function of software debugging and system upgrade maintenance can be realized by HDMI interface.
In embodiments of the present invention, data conversion module 200 include: the first input end being connect with main scheme module 101,
Second input terminal, and the first output end being connect with HDMI interface module 401；
Main scheme module 101, for URAT data to be sent to the first input end of data conversion module 200, and general
HDMI data are sent to the second input terminal of data conversion module 200；
Data conversion module 200 is also used to receive the output mode instruction of the transmission of self-adaptive control module 301, and, it will
Target data corresponding with output mode instruction is sent to HDMI interface module 401 by the first output end.HDMI interface module
401 are detected by hot plug, obtain level signal, and above-mentioned level signal is converted output mode by self-adaptive control module 301
Instruction is sent to data conversion module 200, and the first output end connects the corresponding data feedback of above-mentioned output mode instruction to HDMI
Mouth mold block 401.
In the present embodiment, self-adaptive control module 301 are also used to be set as defaulting by the output mode of the first output end defeated
Mode out；
In the case where defaulting output mode, URAT data are sent to HDMI interface module 401 by the first output end.
Main scheme module 101 is connected respectively to the first input end and second of data conversion module 200 by data circuit
First output end of input terminal, data conversion module 200 is connected to HDMI interface module 401.Data conversion module 200 is used for will
HDMI data and URAT data are merged into the same output channel, and data conversion module 200 in one embodiment is preferred
The high simulation of BL1551 High speed and low resistance bandwidth switches integrated circuit, and data conversion module 200 supports communication bandwidth to be up to
300MHz, first input end of the URAT data connection to data conversion module 200 on main scheme module 101, main scheme module
For HDMI data connection on 101 to the second input terminal of data conversion module 200, data conversion module 200 includes the first data
Conversion module 201 and the second data conversion module 202, HDMI data include HDMI-SDA and HDMI-SCL, HDMI-SDA and
HDMI-SCL is that have a memory body, internal storage in display interior for allowing HDMI-sourc and display to link up
The resolution ratio supported in relation to display, such as: 720P or 1080P；It is connected at present if HDMI-sourc does not know
The TV resolution that display is supported is how many when, and HDMI-sourc does not know to run out the signal of what resolution ratio,
Therefore reading display can be gone to be propped up through the end HDMI-SCL and two, the end HDMI-SDA stabilizer blade position in HDMI-sourc at the beginning
The resolution ratio held just runs out the image frame for meeting monitor resolution after HDMI-sourc knows.Wherein HDMI-SCL
It is clock (CLOCK), HDMI-SDA is data foot position.URAT data include URAT-TX and URAT-RX, and URAT-TX is to send
(transport) data, URAT-RX are to receive (receive) data, and in one embodiment, data conversion module 200 wraps
Include the first data conversion module 201 and the second data conversion module 202, the preferred analog switch core of above-mentioned data conversion module 200
Piece BL1551, in one embodiment, 1 foot of analog switch chip BL1551 are first input end, analog switch chip
3 feet of BL1551 are the second input terminal, and 4 feet of analog switch chip BL1551 are the first output end, analog switch chip
6 feet of BL1551 are second output terminal, and URAT-TX is connected to 1 foot of the first data conversion module 201, and URAT-RX is connected to the
1 foot of two data conversion modules 202, HDMI-SDA are connected to 3 feet of the first data conversion module 201, and HDMI-SCL is connected to
HDMI-SDA and URAT-TX are merged into the first data by 3 feet of the second data conversion module 202, the first data conversion module 201
4 feet of conversion module 201 export, and the second data conversion module 202 merges HDMI-SCL and URAT-RX data to second
4 feet of data conversion module 202, the preferred A type HDMI interface of HDMI interface module 401,15 feet in above-mentioned A type HDMI interface are
2nd end I2C, 16 feet in above-mentioned A type HDMI interface are the first end I2C, and 19 feet in above-mentioned A type HDMI interface are the end HPD,
HPD (hot plug detection), the AC pin that 18 feet in above-mentioned A type HDMI interface are 5V, above-mentioned first data conversion module 201 connect
16 feet of HDMI interface module 401 are connected to, above-mentioned second data conversion module 202 is connected to 15 feet of HDMI interface module 401,
15 and 16 feet of HDMI interface module 401 are I2C (Inter-Integrated Circuit twin wire universal serial bus) pin,
I2C pin is transmitted for DDC, DDC (Display Data Channel, be mainly used for the transmission of EDID and HDCP), HDCP
(High-bandwidthDigital Content Protection) is high-bandwidth digital content protection technology.Pass through VCC
(Volt Current Condenser, supply voltage) terminates logical external power supply, and carries out mode with self-adaptive control module 301
Switching, changes the data type that corresponding modes are worked as in output, and corresponding data are output to the 15th of HDMI interface module 401 the, 16 pins.
The output mode that data conversion module 200 in this embodiment is defaulted is output URAT data, and URAT-TX is output to by default
URAT-RX is output to 15 feet of HDMI interface module 401 by 16 feet of HDMI interface module 401.Pass through self-adaptive control module
The output mode of 301 switching URAT and HDMI data passes through HDMI interface when not influencing the original function of HDMI interface
Data needed for switching output can realize the function of software debugging and system upgrade maintenance.
In embodiments of the present invention, adaptation control circuit includes mode state convert resistance R1, scheme control switching electricity
R2, adaptive model controller Q1, shunt resistance R3 and for electric diode D1 are hindered, is connect for the input terminal and HDMI of electric diode D1
The 19th foot connection on mouth mold block 401, connect for the output end of electric diode D1 with scheme control convert resistance R2, adaptive mode
Formula controller Q1 base stage is connect with scheme control convert resistance R2, and adaptive model controller Q1 collector and mode state switch
Resistance R1 connection, the one end shunt resistance R3 connect with the base stage of adaptive model controller Q1, the other end and adaptive model control
The emitter of device Q1 processed connects, and 6 feet of data conversion module 200 are connected to mode state convert resistance R1 and adaptive model controls
Between the collector of device Q1, the emitter of adaptive model controller Q1 is grounded.In a specific implementation, HDMI interface module
401 preferred HDMIAtype 19pin pin stands, adaptive model controller Q1 are MMBT3904 triode, and mode state is cut
The resistance value for changing resistance R1 is 10 kilohms, and the resistance value of scheme control convert resistance R2 is 1 kilohm, and data conversion module 200 is
Analog switch BL1551 is the small electricity that adaptation power supply diode D11N4148,1N4148 are point-contact type for electric diode D1
Flow HF switch diode.
In invention the present embodiment, when circuit use is under HDMI sink mode, the 18th pin of HDMI interface module 401
HDMI 5V is in the voltage status of 0V, and mode state convert resistance R1 can be the first data conversion in self-adaptive control module 301
The 6th pin in module 201 and the second data conversion module 202 is changed into high-voltage state, makes the work of data conversion module 200
Operation mode is the URAT mode of default, and URAT-TX is output to HDMI interface by the 4th pin of the first data conversion module 201
The data of 16th pin of module 401, URAT-RX are output to HDMI interface by the 4th pin of the second data conversion module 202
15th pin of module 401, when HDMI interface module 401, which is detected, is connected to HDMI-sourc containing high-definition data, HDMI
Become 5V level from 0V at 5V, 5V voltage passes through HDMI interface module by the resistance stream in HDMI-Sink preferred circuit at this time
401 the 19th foot, above-mentioned 19th foot are HPD foot, then again by the 19th foot of connection for electric diode D1 input terminal.Voltage warp
One end that scheme control convert resistance R2 is given to for the output of electric diode D1 output end is crossed, scheme control convert resistance R2's is another
End connect and is divided with shunt resistance R3, obtains a corresponding voltage to be drivingly connected to adaptive model controller Q1
Base stage, make adaptive model controller Q1 work in saturated.The collector of adaptive model controller Q1 at this time
PN junction conducting in a saturated state, and 0V voltage ground terminal is connected to by the emitter of adaptive model controller Q1, and by
6th foot of one data conversion module 201 and the second data conversion module 202 is converted into low level state.It switches at high speed out at this time
The first data conversion module 201 is closed and mode that the work of the second data conversion module 202 is sent out after quick disconnect, by data conversion
The 1st foot to the 4th foot output mode of module 200 changes to the 3rd foot to the 4th foot output mode, switches to the output mould of HDMI data
Formula, adaptation control circuit restores to connect dedicated URAT debugging tool under default startup mode after extracting HDMI source equipment
It can be debugged with machinery equipment, software system updating.
In one embodiment, when circuit use is under HDMI source mode, the 18th of URAT interface is drawn under present mode
Foot HDMI 5V is in 5V voltage status.When default is without connection HDMI sink equipment, default always at the 18th foot HDMI 5V
It is 5V voltage status, the 19th foot HPD pin is in the pull-down state of standard HDMI source preferred circuit, the 19th foot default electricity
Pressure is 0V to 0.4V or so.Due to the pressure drop for having 0.6V for electric diode D1 in adaptive circuit, default voltage at this time is not
It is enough that adaptation control circuit is driven to work.Mode state convert resistance R1 can be data conversion module in adaptation control circuit
The 6th pin in 200 becomes high-voltage state, communicates the operating mode of data conversion module 200 under URAT mode,
The data of URAT-TX and URAT-RX are output to the 15th of HDMI interface the, 16 by the 4th pin of data conversion module 200 and draw
Foot.When connection is connected to HDMI sink containing high-definition data, 5V level is immediately turned at HDMI 5V.5V voltage passes through at this time
Resistance stream in HDMI Sink preferred circuit passes through the HPD of the 19th foot, and then the 19th foot is connected for electric diode D1 input terminal,
Voltage passes through one end that scheme control convert resistance R2 is given to for the output of electric diode D1 output end, scheme control convert resistance R2
The other end connect and divided with shunt resistance R3, obtain a corresponding voltage to be drivingly connected to adaptive model control
The base stage of device Q1 processed makes adaptive model controller Q1 work in saturated.Adaptive model controller Q1 at this time
The conducting in a saturated state of collector PN junction is connected to 0V voltage ground end by the emitter of adaptive model controller Q1,
6th foot of data conversion module 200 is converted into low level state.The work of data conversion module 200 at this time is after quick disconnect
The mode of hair, is changed by the 1st foot to the 4th foot output mode to the 3rd foot to the 4th foot output mode, and data switch to HDMI data
Output mode.After extracting HDMI sink equipment, adaptation control circuit restores default startup mode, connects dedicated URAT debugging
Tool can be debugged with machinery equipment, software system updating, in transmission URAT data procedures, when detecting high-definition data
When being connected to HDMI sink, it is initially switched off the output of URAT data, then data are switched to the output mode of HDMI data, is possessed
High speed is first had no progeny the data mechanism of hair and the advantage of low on-resistance.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
It should be understood by those skilled in the art that, the embodiment of the embodiment of the present invention can provide as method, apparatus or calculate
Machine program product.Therefore, the embodiment of the present invention can be used complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present invention can be used one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present invention be referring to according to the method for the embodiment of the present invention, terminal device (system) and computer program
The flowchart and/or the block diagram of product describes.It should be understood that flowchart and/or the block diagram can be realized by computer program instructions
In each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these
Computer program instructions are set to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine, so that being held by the processor of computer or other programmable data processing terminal devices
Capable instruction generates for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of specified function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing terminal devices
In computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one side of one or more flows of the flowchart and/or block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing terminal devices, so that
Series of operation steps are executed on computer or other programmable terminal equipments to generate computer implemented processing, thus
The instruction executed on computer or other programmable terminal equipments is provided for realizing in one or more flows of the flowchart
And/or in one or more blocks of the block diagram specify function the step of.
Although the preferred embodiment of the embodiment of the present invention has been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and fall into all change and modification of range of embodiment of the invention.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
It above to a kind of interface circuit provided by the present invention, is described in detail, specific case used herein
Principle and implementation of the present invention are described, the above embodiments are only used to help understand side of the invention
Method and its core concept；At the same time, for those skilled in the art, according to the thought of the present invention, in specific embodiment
And there will be changes in application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of interface circuit characterized by comprising
Main scheme module, for obtaining high-definition media interface HDMI data and asynchronous receiving-transmitting transmitter URAT data；
Data conversion module, the HDMI data and the URAT data for sending the main scheme module are merged into together
One output channel；
Self-adaptive control module, for switching the output mode of the output channel；
HDMI interface module, for receiving the corresponding data of the output mode.
2. interface circuit according to claim 1, which is characterized in that the data conversion module includes: and the main side
First input end, the second input terminal of case module connection, and the first output end being connect with the HDMI interface module；
The main scheme module, for the URAT data to be sent to the first input end of the data conversion module, and
The HDMI data are sent to the second input terminal of the data conversion module；
Data conversion module is also used to receive the output mode instruction that the self-adaptive control module is sent, and, will with it is described
Output mode instructs corresponding target data to be sent to the HDMI interface module by first output end.
3. interface circuit according to claim 2, which is characterized in that the self-adaptive control module, being also used to will be described
The output mode of first output end is set as default output mode；
Under the default output mode, the URAT data are sent to the HDMI interface module by first output end.
4. interface circuit according to claim 3, which is characterized in that the self-adaptive control module includes that mode state is cut
Change resistance, scheme control convert resistance, adaptive model controller, shunt resistance and for electric diode；
The input terminal for electric diode is connect with the HPD interface in the HDM interface module, described for the defeated of electric diode
Outlet is connect with scheme control convert resistance one end；
The base stage of the adaptive model controller connect with the scheme control convert resistance other end, collector and the mould
The connection of formula state convert resistance one end, emitter ground connection；
Described shunt resistance one end connect with the base stage of the adaptive model controller, the other end and the adaptive model control
The emitter of device processed connects；
The second output terminal of the data conversion module and the mode state convert resistance, the adaptive model controller
Collector connection.
5. interface circuit according to claim 4, which is characterized in that the first input end include the end URAT-TX and
The end URAT-RX, second input terminal include the end HDMI-SDA and the end HDMI-SCL, and first output end includes the first output
Channel and the second output channel, the HDMI interface module include the first end I2C and the 2nd end I2C, the first end I2C and institute
The connection of the first output channel is stated, the 2nd end I2C is connect with second output channel；
First output channel, it is described for the end URAT-TX or the received data in the end HDMI-SDA to be sent to
First end I2C；
Second output channel, it is described for the end URAT-RX or the received data in the end HDMI-SCL to be sent to
2nd end I2C.
6. interface circuit according to claim 4, which is characterized in that the adaptive model controller is three pole of NPN type
Pipe.
7. interface circuit according to claim 4, which is characterized in that the HDMI interface module is A type HDMI interface.
8. interface circuit according to claim 4, which is characterized in that the resistance value of the mode state convert resistance is 10,000
Ohm.
9. interface circuit according to claim 4, which is characterized in that the resistance value of the scheme control convert resistance is 1,000
Ohm.
10. interface circuit according to claim 1, which is characterized in that the data conversion module is analog switch
BL1551。
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| CN201910319522.0A CN110062185A (en) | 2019-04-19 | 2019-04-19 | A kind of interface circuit |
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