CN209250665U - A kind of monobus communication signal isolation circuit - Google Patents
A kind of monobus communication signal isolation circuit Download PDFInfo
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- CN209250665U CN209250665U CN201822146339.9U CN201822146339U CN209250665U CN 209250665 U CN209250665 U CN 209250665U CN 201822146339 U CN201822146339 U CN 201822146339U CN 209250665 U CN209250665 U CN 209250665U
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Abstract
The utility model discloses a kind of monobus communication signal isolation circuit, and the first pull-up resistor is connect with host interface port；First comparing unit non-inverting input terminal is connect with host interface port, and the inverting input terminal of the first comparing unit connects one first reference voltage；First optocoupler control terminal is connect with the first comparing unit output end；Second pull-up resistor is connect with slave interface end, and the collector of the first optocoupler is connect with slave interface end, and the emitter of the first optocoupler is connect with the ground wire at slave interface end；Second comparing unit non-inverting input terminal is connect with slave interface end, and the inverting input terminal of the second comparing unit connects one second reference voltage；Second optocoupler control terminal is connect with the second comparing unit output end, and the collector of the second optocoupler is connect with host interface port, and the emitter of the second optocoupler is connect with the ground wire at host interface port.The technical issues of the utility model solves host side in monobus communication process and can not be effectively isolated from generator terminal.
Description
Technical field
The utility model relates to communication technique fields, and in particular to a kind of monobus communication signal isolation circuit.
Background technique
The universal serial bus carried out data transmission between currently used microcomputer and peripheral hardware mainly have I2C bus, spi bus and
SCI bus.Wherein I2C bus is communicated (clock lines, a data line) in a manner of 2 line of synchronous serial, and spi bus is then
It is communicated in a manner of 3 line of synchronous serial (clock lines, a data input line, a data output line), and SCI bus
It is to be communicated (a data input line, a data output line) in an asynchronous manner.These buses at least need two or
Two or more signal wires.In recent years, it is proposed distinctive monobus (1-Wire Bus) technology.The technology and above-mentioned total
Line is different, it uses single signal wire, can not only transmit clock, but also can transmit data, and data transmission is two-way, thus this
The advantages that kind Single Wire Bus Technology has route simple, and hardware spending is few, low in cost, convenient for bus extension and safeguards.
Monobus is suitable for single host system, can control one or more slave devices.Host can be microcontroller,
Slave can be single wire bus device, and the data exchange between them only passes through a signal line.When only one slave devices,
System can be operated by single node system；When there is a plurality of slave devices, system then presses multi-node system operation.
But the drawbacks of current this monobus communication modes are interfered with each other there are host side and slave end signal.
Utility model content
One purpose of the utility model is to solve at least the above problems, and provide the advantages of at least will be described later.
The purpose of the utility model is to provide a kind of monobus communication signal isolation circuit, by host side and from generator terminal
Isolated location is respectively set, is effectively isolated host side and from generator terminal and to form mutually independent power-supply system and earthed system, disappear
Except host side and from the interference extremely in information exchange, the accuracy of signal transmission is improved, solves monobus communication process
Middle host side and the technical issues of can not be effectively isolated from generator terminal.
In order to realize these purposes according to the present utility model and other advantages, provide a kind of monobus communication signal every
From circuit, comprising:
First pull-up resistor, connect with host interface port；
First comparing unit, non-inverting input terminal are connect with the host interface port, the reverse phase of first comparing unit
Input terminal connects one first reference voltage；
First optocoupler, control terminal are connect with the first comparing unit output end；
Second pull-up resistor is connect with slave interface end, the collector of first optocoupler and the slave interface end
Connection, the emitter of first optocoupler are connect with the ground wire at the slave interface end；
Second comparing unit, non-inverting input terminal are connect with the slave interface end, the reverse phase of second comparing unit
Input terminal connects one second reference voltage；
Second optocoupler, control terminal are connect with the second comparing unit output end, the collector of second optocoupler with
The host interface port connection, the emitter of second optocoupler are connect with the ground wire at the host interface port.
It preferably, further include that the first reference signal generates unit and the second reference signal generation unit, first benchmark
The input terminal of signal generation unit is connect with the collector of second optocoupler, the inverting input terminal of first comparing unit with
First reference signal generates the output end connection of unit；Second reference signal generates the input terminal and described the of unit
The collector of one optocoupler connects, and the reverse phase that second reference signal generates the output end and second comparing unit of unit is defeated
Enter end connection.
Preferably, first comparing unit includes:
First diode, cathode are connect with the host interface port；
First comparator, non-inverting input terminal are connect with the first diode anode, the reverse phase of the first comparator
Input terminal is connect with the output end that first reference signal generates unit；
First resistor, first end are connect with power end, the second end of the first resistor and the first comparator
Non-inverting input terminal connection.
Preferably, the light-emitting diodes tube cathode of first optocoupler is connect with the output end of the first comparator, described
The light-emitting diodes tube cathode of first optocoupler is connected to power end, the light emitting diode sun of first optocoupler by a second resistance
Pole is connected to power end by a 3rd resistor.
Preferably, the first reference signal generation unit includes:
First buffer, input terminal are connect with the collector of second optocoupler；
4th resistance, first end are connect with power end, and the second end of the 4th resistance is connected to first buffering
The input terminal of device；
First bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, first bleeder circuit it is defeated
Enter end to connect with the output end of first buffer, the output end of first bleeder circuit is anti-with the first comparator
The connection of phase input terminal.
Preferably, second comparing unit includes:
Second diode, cathode are connect with the slave interface end；
Second comparator, non-inverting input terminal are connect with second diode anode, the reverse phase of second comparator
Input terminal is connect with the output end that second reference signal generates unit；
7th resistance, first end are connect with power end, second end and second comparator of the 7th resistance
Non-inverting input terminal connection；
Wherein, the power end of the host interface port is isolated with the holding of the power end of the slave interface end, and the master
Each power end voltage of machine interface end is consistent, and each power end voltage of the slave interface end is consistent.
Preferably, the light-emitting diodes tube cathode of second optocoupler is connect with the output end of second comparator, described
The light-emitting diodes tube cathode of second optocoupler is connected to power end, the light emitting diode sun of second optocoupler by one the 8th resistance
Pole is connected to power end by one the 9th resistance.
Preferably, the second reference signal generation unit includes:
Second buffer, input terminal are connect with the collector of first optocoupler；
Tenth resistance, first end are connect with power end, and the second end of the tenth resistance is connected to second buffering
The input terminal of device；
Second bleeder circuit comprising the eleventh resistor and twelfth resistor being arranged in series, second bleeder circuit
Input terminal connect with the output end of first buffer, the output end of second bleeder circuit and second comparator
Inverting input terminal connection.
It preferably, further include one first driving unit, first driving unit includes that the first field-effect tube and first are non-
Door, first field-effect tube are N-type field-effect tube, the source electrode of first field-effect tube connect with the host interface port,
Grounded drain, the grid of first field-effect tube connect the output end of first NOT gate, the input termination of first NOT gate
The collector of second optocoupler.
It preferably, further include one second driving unit, second driving unit includes that the second field-effect tube and second are non-
Door, second field-effect tube are N-type field-effect tube, the source electrode of second field-effect tube connect with the slave interface end,
Grounded drain, the grid of second field-effect tube connect the output end of second NOT gate, the input termination of second NOT gate
The collector of first optocoupler.
Compared with prior art, the beneficial effect that the utility model includes is:
1, host and slave processors are isolated into mutually by the utility model by the way that light-coupled isolation is respectively set in host side and from generator terminal
Independent electric power supply and earthed system are eliminated the signal interference between host and slave processors；
2, signal transmission error rates are reduced, the reliability of monobus signal transmission is improved；
3, the variation benchmark that unit is generated by reference signal, improves signal in the stability of transmission process.
The further advantage, target and feature of the utility model will be partially reflected by the following instructions, and part will also pass through
Research and practice to the utility model and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The following describes the utility model in further detail with reference to the accompanying drawings, to enable those skilled in the art referring to explanation
Text can be implemented accordingly.
As shown in Figure 1, the utility model provides a kind of monobus communication signal isolation circuit, including host transmission circuit
With slave transmission circuit, host transmission circuit includes the first pull-up resistor Rup1, the first comparing unit, the first optocoupler U3 and first
Reference signal generates unit.Slave transmission circuit includes the second pull-up resistor Rup2, the second comparing unit, the second optocoupler U6 and the
Two reference signals generate unit.
In order to which host transmission circuit and slave transmission circuit realize electrical isolation, eliminates host transmission circuit and slave is received and dispatched
Signal interference between circuit improves the accuracy and reliability communicated between host transmission circuit and slave transmission circuit, and
Propose the technical solution of the utility model.
First pull-up resistor Rup1 is connect with host interface port SBUS1, under normal condition, passes through the first pull-up resistor Rup1
The voltage of host interface port SBUS1 is maintained at high level.
First comparing unit is connected between host interface port SBUS1 and the first optocoupler U3, specifically, described first compares
Unit includes: first diode D1, first comparator OP1 and first resistor R1, the cathode of first diode D1 and the host
Interface end SBUS1 connection, the non-inverting input terminal of first comparator OP1 are connect with the first diode D1 anode, pass through first
Diode D1 avoids the reception signal of host from generating interference to the first comparing unit.The anti-phase input of the first comparator OP1
The output end for generating unit with first reference signal is held to connect.The first end of first resistor R1 is connect with power end Vcc, institute
The second end for stating first resistor R1 is connect with the non-inverting input terminal of the first comparator OP1, under normal condition, is compared for first
The non-inverting input terminal of device OP1 provides high level signal.
Wherein, the power end Vdd of the power end Vcc of the host interface port SBUS1 and slave interface end SBUS2 is protected
Isolation is held, and each power end Vcc voltage of the host interface port SBUS1 is consistent, the slave interface end SBUS2's
Each power end Vdd voltage is consistent.
Specifically, in the present embodiment, each power end Vcc of host side and each power end Vdd from generator terminal mutually every
From setting, the voltage of Vcc and Vdd can be set to 5V, and the resistance value of each resistance can be equal.
The control terminal of first optocoupler U3 is connect with the first comparing unit output end, specifically, the first optocoupler U3
Light-emitting diodes tube cathode connect with the output end of the first comparator OP1, the light emitting diode of the first optocoupler U3 yin
Pole is connected to power end Vcc by a second resistance R2, and the light-emitting diodes tube anode of the first optocoupler U3 passes through third electricity
Resistance R3 is connected to power end Vcc, and first comparator OP1 exports low level, then the lumination of light emitting diode of the first optocoupler U3.
The input terminal that first reference signal generates unit is connect with the collector of the second optocoupler U6, and described first
The inverting input terminal of comparator OP1 is connect with the output end that first reference signal generates unit.Specifically, first base
It includes: the first buffer U1, the 4th resistance R4 and the first bleeder circuit, the input terminal of the first buffer U1 that calibration signal, which generates unit,
It is connect with the collector of the second optocoupler U6；4th resistance R4 first end is connect with power end Vcc, the 4th resistance R4's
Second end is connected to the input terminal of the first buffer U1；First bleeder circuit includes the 5th resistance R5 being arranged in series and
Six resistance R6, the first end of the 5th resistance R5 are connect with the output end of the first buffer U1, the second end of the 6th resistance R6
Ground connection.The connects end altogether of 5th resistance R5 and the 6th resistance R6 is connect with the inverting input terminal of first comparator OP1.
First driving unit includes the first field-effect tube Q1 and the first NOT gate U2, the first field-effect tube Q1 is N
The driving capability of type field-effect tube, N-type field-effect tube is stronger, improves signal transmission distance and accuracy.First field-effect
The source electrode of pipe Q1 connect with the host interface port SBUS1, grounded drain, and the grid of the first field-effect tube Q1 connects described
The output end of one NOT gate U2, the input of the first NOT gate U2 terminate the collector of the second optocoupler U6.
Slave transmission circuit is consistent with host transmission circuit structure, and slave transmission circuit and host transmission circuit are staggeredly pair
Claim setting.Specifically, the second pull-up resistor Rup2 is connect with slave interface end SBUS2, the output end of the first optocoupler U3 with
The slave interface end SBUS2 connection, the signal that host is sent is successively by comparing and being sent to slave interface end after shaping
SBUS2。
The non-inverting input terminal of second comparing unit is connect with the slave interface end SBUS2, second comparing unit
Inverting input terminal is connect with the output end that first reference signal generates unit.Specifically, second comparing unit includes:
Second diode D2, the second comparator OP2 and the 7th resistance R7, the cathode of the second diode D2 and the slave interface end
SBUS2 connection；The non-inverting input terminal of second comparator OP2 is connect with the second diode D2 anode, second comparator
The inverting input terminal of OP2 is connect with the output end that second reference signal generates unit.
The first end of 7th resistance R7 is connect with power end Vdd, and the second end of the 7th resistance R7 and described second compares
Non-inverting input terminal connection compared with device OP2.
Second optocoupler U6 control terminal is connect with the second comparing unit output end, specifically, the second optocoupler U6
Light-emitting diodes tube cathode is connect with the output end of the second comparator OP2, the light-emitting diodes tube cathode of the second optocoupler U6
It is connected to power end Vdd by one the 8th resistance R8, the light-emitting diodes tube anode of the second optocoupler U6 passes through one the 9th resistance
R9 is connected to power end Vdd.Second comparator OP2 exports low level, then the lumination of light emitting diode of the second optocoupler U6.
Wherein, the emitter of the first optocoupler U3 is connect with the ground wire at the slave interface end SBUS2, and described second
The emitter of optocoupler U6 is connect with the ground wire at the host interface port SBUS1, so that the emitter and current collection of the first optocoupler U3
Using the system voltage of slave interface end SBUS2, the emitter and collector of the second optocoupler U6 connects using host for pole
The system voltage of mouth end SBUS1.To which the system of the system voltage of host interface port SBUS1 and slave interface end SBUS2 is electric
Pressure realizes isolation by the first optocoupler U3 and the second optocoupler U6.
The input terminal that second reference signal generates unit is connect with the collector of the first optocoupler U3, and described second
The output end that reference signal generates unit is connect with the inverting input terminal of the second comparator OP2.Specifically, second base
It includes: the second buffer U4, the tenth resistance R10 and the second bleeder circuit, the input of the second buffer U4 that calibration signal, which generates unit,
End is connect with the collector of the first optocoupler U3；The first end of tenth resistance R10 is connect with power end Vdd, the tenth electricity
The second end of resistance R10 is connected to the input terminal of the second buffer U4；Second bleeder circuit includes the 11 be arranged in series
Resistance R11 and twelfth resistor R12, the first end of eleventh resistor R11 are connect with the output end of the second buffer U4, the
The second end of 12 resistance R12 is grounded.The connects end altogether of eleventh resistor R11 and twelfth resistor R12 are with the second comparator OP2's
Inverting input terminal connection.
Second driving unit includes the second field-effect tube Q2 and the second NOT gate U5, the second field-effect tube Q2 is N
Type field-effect tube, the source electrode of the second field-effect tube Q2 connect with the slave interface end SBUS2, grounded drain, and described
The grid of two field-effect tube Q2 connects the output end of the second NOT gate U5, and the input of the second NOT gate U5 terminates first light
The collector of coupling U3.
The course of work is as follows:
When host interface port SBUS1 issues high level signal, i.e., voltage is pulled up supreme electricity by the first pull-up resistor Rup1
It is flat, it is input to the non-inverting input terminal of first comparator OP1, first comparator OP1 exports high level, and the first optocoupler U3 is not triggered,
First optocoupler U3 is remained off, by the effect of the tenth resistance R10, the input terminal input high level of the second NOT gate U5, and
Two field-effect tube Q2 control terminal input low levels, remain off, since the voltage pull-up of the second pull-up resistor Rup2 acts on,
Slave interface end SBUS2 keeps high level, is equivalent to and receives high level signal.
Meanwhile the effect by the tenth resistance R10, the second buffer U4 input terminal keep high level, the second comparator OP2
Inverting input terminal keeps high level, and the second comparator OP2 exports low level, triggers the second optocoupler U6, the second optocoupler U6 conducting, the
The input terminal input low level of one buffer U1, that is, the input terminal input low level of the first bleeder circuit, first comparator
The inverting input terminal input low level of OP1, so that first comparator OP1 stablizes output high level signal, final slave interface end
SBUS2 keeps high level.
In above-mentioned signals transmission, Phototube Couplings are carried out by two optocouplers, eliminate host end system and from generator terminal system
Signal interference between system improves signal and transmits accuracy.Meanwhile the first light emitting diode and host end system on optocoupler U3
It connects, the triode on the first optocoupler U3 is connect with slave end system；It is corresponding, light emitting diode on the second optocoupler U6 with from
Generator terminal system connects, and the triode on the second optocoupler U6 is connect with host end system；To by host end system and from generator terminal system
The ground wire of system is isolated.
When host interface port SBUS1 issues low level signal, it is input to the non-inverting input terminal of first comparator OP1, the
One comparator OP1 exports low level, the first optocoupler U3 triggering, the first optocoupler U3 conducting, the input end grounding of the second NOT gate U5, phase
When in input low level, the second field-effect tube Q2 control terminal input high level, triggering and conducting, slave interface end SBUS2 ground connection, from
Machine interface end SBUS2 becomes low level, is equivalent to and receives low level signal.
Meanwhile the second buffer U4 input end grounding, the second buffer U4 input terminal receive low level, the second comparator
OP2 inverting input terminal receives low level, and the second comparator OP2 exports high level, and the second optocoupler U6 is disconnected, the first buffer U1's
Input terminal input high level, that is, the input terminal input high level of the first bleeder circuit, the anti-phase input of first comparator OP1
Input high level is held, so that first comparator OP1 stablizes output low level signal, final slave interface end SBUS2 keeps low electricity
It is flat.
From the above mentioned, two systems are subjected to photosignal isolation by two optocouplers, while by by two optocouplers
Ground wire isolation connection, it is finally that host and slave processors system is mutually isolated, two independent receive-transmit systems are formed, elimination is interfered with each other, mentioned
The reliability and accuracy of high RST transmission.
In above process, the benchmark that reference signal generates unit output end changes, steady to keep signal to transmit
It is qualitative.
When slave interface end SBUS2 sends signal, and host interface port SBUS1 receives signal, the course of work and above-mentioned master
The process that machine interface end SBUS1 sends a signal to slave interface end SBUS2 is consistent.
From the above mentioned, host and slave processors are isolated by the way that light-coupled isolation is respectively set in host side and from generator terminal for the utility model
At mutually indepedent power-supply system and earthed system, eliminate the signal interference between host and slave processors；Meanwhile reducing signal
Transmission error rates improve the reliability of monobus signal transmission.Also, the variation benchmark of unit is generated by reference signal,
Signal is improved in the stability of transmission process.
It is not only in the description and the implementation although the embodiments of the present invention have been disclosed as above
Listed utilization, it can be applied to various fields suitable for the present invention completely, for those skilled in the art,
It can readily realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, this reality
It is not limited to specific details and legend shown and described herein with novel.
Claims (10)
1. a kind of monobus communication signal isolation circuit characterized by comprising
First pull-up resistor, connect with host interface port；
First comparing unit, non-inverting input terminal are connect with the host interface port, the anti-phase input of first comparing unit
One first reference voltage of end connection；
First optocoupler, control terminal are connect with the first comparing unit output end；
Second pull-up resistor is connect with slave interface end, and the collector of first optocoupler is connect with the slave interface end,
The emitter of first optocoupler is connect with the ground wire at the slave interface end；
Second comparing unit, non-inverting input terminal are connect with the slave interface end, the anti-phase input of second comparing unit
One second reference voltage of end connection；
Second optocoupler, control terminal are connect with the second comparing unit output end, the collector of second optocoupler with it is described
Host interface port connection, the emitter of second optocoupler are connect with the ground wire at the host interface port.
2. monobus communication signal isolation circuit as described in claim 1, which is characterized in that further include that the first reference signal produces
Raw unit and the second reference signal generate unit, and first reference signal generates the input terminal and second optocoupler of unit
The output end that collector connection, the inverting input terminal of first comparing unit and first reference signal generate unit connects
It connects；The input terminal that second reference signal generates unit is connect with the collector of first optocoupler, the second benchmark letter
Number generate unit output end connect with the inverting input terminal of second comparing unit.
3. monobus communication signal isolation circuit as claimed in claim 2, which is characterized in that the first comparing unit packet
It includes:
First diode, cathode are connect with the host interface port；
First comparator, non-inverting input terminal are connect with the first diode anode, the anti-phase input of the first comparator
The output end for generating unit with first reference signal is held to connect；
First resistor, first end are connect with power end, the same phase of the second end of the first resistor and the first comparator
Input terminal connection.
4. monobus communication signal isolation circuit as claimed in claim 3, which is characterized in that luminous the two of first optocoupler
Pole pipe cathode is connect with the output end of the first comparator, and the light-emitting diodes tube cathode of first optocoupler passes through one second electricity
Resistance is connected to power end, and the light-emitting diodes tube anode of first optocoupler is connected to power end by a 3rd resistor.
5. monobus communication signal isolation circuit as claimed in claim 4, which is characterized in that first reference signal generates
Unit includes:
First buffer, input terminal are connect with the collector of second optocoupler；
4th resistance, first end are connect with power end, and the second end of the 4th resistance is connected to first buffer
Input terminal；
First bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, the input terminal of first bleeder circuit
It is connect with the output end of first buffer, the output end of first bleeder circuit and the reverse phase of the first comparator are defeated
Enter end connection.
6. monobus communication signal isolation circuit as claimed in claim 5, which is characterized in that the second comparing unit packet
It includes:
Second diode, cathode are connect with the slave interface end；
Second comparator, non-inverting input terminal are connect with second diode anode, the anti-phase input of second comparator
The output end for generating unit with second reference signal is held to connect；
7th resistance, first end are connect with power end, the second end and the same phase of second comparator of the 7th resistance
Input terminal connection；
Wherein, the power end of the host interface port is isolated with the holding of the power end of the slave interface end, and the host connects
Each power end voltage at mouth end is consistent, and each power end voltage of the slave interface end is consistent.
7. monobus communication signal isolation circuit as claimed in claim 6, which is characterized in that luminous the two of second optocoupler
Pole pipe cathode is connect with the output end of second comparator, and the light-emitting diodes tube cathode of second optocoupler passes through one the 8th electricity
Resistance is connected to power end, and the light-emitting diodes tube anode of second optocoupler is connected to power end by one the 9th resistance.
8. monobus communication signal isolation circuit as claimed in claim 7, which is characterized in that second reference signal generates
Unit includes:
Second buffer, input terminal are connect with the collector of first optocoupler；
Tenth resistance, first end are connect with power end, and the second end of the tenth resistance is connected to second buffer
Input terminal；
Second bleeder circuit comprising the eleventh resistor and twelfth resistor being arranged in series, second bleeder circuit it is defeated
Enter end to connect with the output end of first buffer, the output end of second bleeder circuit is anti-with second comparator
The connection of phase input terminal.
9. monobus communication signal isolation circuit as claimed in claim 8, which is characterized in that further include that one first driving is single
Member, first driving unit include the first field-effect tube and the first NOT gate, and first field-effect tube is N-type field-effect tube,
The source electrode of first field-effect tube connect with the host interface port, grounded drain, and the grid of first field-effect tube connects
The output end of first NOT gate, the input of first NOT gate terminate the collector of second optocoupler.
10. monobus communication signal isolation circuit as claimed in claim 9, which is characterized in that further include that one second driving is single
Member, second driving unit include the second field-effect tube and the second NOT gate, and second field-effect tube is N-type field-effect tube,
The source electrode of second field-effect tube connect with the slave interface end, grounded drain, and the grid of second field-effect tube connects
The output end of second NOT gate, the input of second NOT gate terminate the collector of first optocoupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822146339.9U CN209250665U (en) | 2018-12-20 | 2018-12-20 | A kind of monobus communication signal isolation circuit |
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| CN201822146339.9U CN209250665U (en) | 2018-12-20 | 2018-12-20 | A kind of monobus communication signal isolation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525475A (en) * | 2018-12-20 | 2019-03-26 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal isolation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525475A (en) * | 2018-12-20 | 2019-03-26 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal isolation circuit |
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