CN208384565U - A kind of low-power consumption RS485 communication interface circuit - Google Patents
A kind of low-power consumption RS485 communication interface circuit Download PDFInfo
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- CN208384565U CN208384565U CN201821213806.9U CN201821213806U CN208384565U CN 208384565 U CN208384565 U CN 208384565U CN 201821213806 U CN201821213806 U CN 201821213806U CN 208384565 U CN208384565 U CN 208384565U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The utility model provides a kind of low-power consumption RS485 communication interface circuit, comprising: driver, the first end of driver connect first interface line, and second end connects second interface line, and third end connects DI interface, and the 4th end connects DE interface；Receiver, the first end of receiver connect first interface line, and second end connects second interface line, and third end connects R0 interface, and the 4th end connects RE interface；First metal-oxide-semiconductor, the drain electrode of the first metal-oxide-semiconductor connect power supply, and the source electrode of the first metal-oxide-semiconductor connects the grid of the first metal-oxide-semiconductor；Second metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor connect power supply, and the grid of the second metal-oxide-semiconductor connects the grid of the first metal-oxide-semiconductor；Third metal-oxide-semiconductor, the drain electrode of third metal-oxide-semiconductor connect power supply, and the grid of third metal-oxide-semiconductor connects the grid of the first metal-oxide-semiconductor and the grid of the second metal-oxide-semiconductor, the 5th end of the source electrode connection receiver of third metal-oxide-semiconductor；Switch, the first end of switch connect the source electrode of the second metal-oxide-semiconductor, the 5th end of the second end connection driver of switch；Wherein, switch is cut-off by DE Interface Controller.
Description
Technical field
The utility model relates to the communications field more particularly to a kind of low-power consumption RS485 communication interface circuits.
Background technique
RS485 communication is a kind of international serial ports standard, and because RS485 bus communication mode has, structure is simple, price
Cheap, the features such as communication distance and message transmission rate are appropriate, and be widely used；RS485 has the full-duplex mode and 2 of 4 lines
The semiduplex mode of line is based on cost consideration, uses semiduplex mode substantially at present.
The RS485 circuit of semiduplex mode may operate in sending mode or reception pattern；In actual use, half-duplex
For a long time in a receive mode, the operating current of circuit in the receiving mode is substantially equal to the real work of circuit to RS485 circuit
Electric current；Current RS485 circuit is not optimized particular for the operating current of reception pattern, reception pattern, sending mode
Operating current between 0.5mA~2mA, battery power supply etc. some pairs of demanding occasions of circuit power consumption, be unable to satisfy
Demand.
Utility model content
The utility model is intended to that one of drawbacks described above is at least overcome to provide a kind of low-power consumption RS485 communication interface circuit, with
Circuit is set to be suitable for battery power supply etc. to the demanding occasion of circuit power consumption.
In order to achieve the above objectives, the technical solution of the utility model is specifically achieved in that
The one aspect of the utility model provides a kind of low-power consumption RS485 communication interface circuit, comprising: first interface line
A；Second interface line B；The first end of driver D, driver D connect first interface line A, the second end connection second of driver D
The third end of interface line B, driver D connect DI interface, and the 4th end of driver D connects DE interface；Receiver R, receiver R's
First end connects first interface line A, and the second end of receiver R connects second interface line B, and the third end connection R0 of receiver R connects
Mouthful, the 4th end of receiver R connects RE interface；The drain electrode of first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 connects power supply VCC, the first MOS
The source electrode of pipe M1 connects the grid of the first metal-oxide-semiconductor M1；The drain electrode of second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 connects power supply VCC, and second
The grid of metal-oxide-semiconductor M2 connects the grid of the first metal-oxide-semiconductor M1；The drain electrode of third metal-oxide-semiconductor M3, third metal-oxide-semiconductor M3 connect power supply VCC,
The grid of third metal-oxide-semiconductor M3 connects the grid of the first metal-oxide-semiconductor M1 and the grid of the second metal-oxide-semiconductor M2, and the source electrode of third metal-oxide-semiconductor M3 connects
Connect the 5th end of receiver R；The first end of switch S1, switch S1 connect the source electrode of the second metal-oxide-semiconductor M2, and the second end of switch S1 connects
The 5th end of driver connected D；Wherein, switch S1 is cut-off by DE Interface Controller.
Wherein, the first metal-oxide-semiconductor M1 is P-channel metal-oxide-semiconductor；Second metal-oxide-semiconductor M2 is P-channel metal-oxide-semiconductor；Third metal-oxide-semiconductor M3 is P ditch
Road metal-oxide-semiconductor.
Wherein, I1=I2=I3 is set；Wherein, I1 is the electric current of the first metal-oxide-semiconductor M1 output, I2 is that the second metal-oxide-semiconductor M2 is defeated
Electric current out, the electric current that I3 is third metal-oxide-semiconductor M3 output.
Wherein, in VCC=3.6V, setting I1 is 0.4uA.
Wherein, static working current IR=3 × I3 of receiver R is set；The static working current ID < of driver D is set
200×I2；In VCC=3.6V, I1 < 0.5uA is set；When reception pattern, circuit is non-loaded total static working current ICC1=
I1+IR；When drive mode, circuit is non-loaded total static working current ICC2=I1+IR+ID.
Wherein, in VCC=3.6V, when reception pattern, the non-loaded total static working current ICC1 < of the circuit is set
2uA。
Wherein, in VCC=3.6V, it is 1.6uA that the ICC1, which is arranged,.
Pass through low function provided by the embodiment of the utility model it can be seen from above-mentioned technical solution provided by the utility model
RS485 communication interface circuit is consumed, can use switch S1, when driver does not work, switch S1 is disconnected, closes driver D's
Operating current；The work electricity of driver D, receiver R are controlled using the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, third metal-oxide-semiconductor M3
Stream；Driver D, the receiver R that can be optimized with cooperating electric current, realize the purpose of the low-power consumption of the reception state of circuit.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other accompanying drawings.
Fig. 1 is the structural schematic diagram of low-power consumption RS485 communication interface circuit provided by the embodiment of the utility model.
Specific embodiment
The embodiments of the present invention is described in detail with reference to the accompanying drawing.
Fig. 1 shows the structural schematic diagram of low-power consumption RS485 communication interface circuit provided by the embodiment of the utility model, ginseng
See Fig. 1, low-power consumption RS485 communication interface circuit provided by the embodiment of the utility model, comprising:
First interface line A；
Second interface line B；
The first end of driver D, driver D connect first interface line A, and the second end of driver D connects second interface line
The third end of B, driver D connect DI interface, and the 4th end of driver D connects DE interface；
The first end of receiver R, receiver R connect first interface line A, and the second end of receiver R connects second interface line
The third end of B, receiver R connect R0 interface, and the 4th end of receiver R connects RE interface；
The drain electrode of first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 connects power supply VCC, and the source electrode of the first metal-oxide-semiconductor M1 connects the first MOS
The grid of pipe M1；
The drain electrode of second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 connects power supply VCC, and the grid of the second metal-oxide-semiconductor M2 connects the first MOS
The grid of pipe M1；
The drain electrode of third metal-oxide-semiconductor M3, third metal-oxide-semiconductor M3 connect power supply VCC, and the grid of third metal-oxide-semiconductor M3 connects the first MOS
The grid of the grid of pipe M1 and the second metal-oxide-semiconductor M2, the 5th end of the source electrode connection receiver R of third metal-oxide-semiconductor M3；
The first end of switch S1, switch S1 connect the source electrode of the second metal-oxide-semiconductor M2, and the second end of switch S1 connects driver D
The 5th end；
Wherein, switch S1 is cut-off by DE Interface Controller.
Specifically, the utility model includes driver D, receiver R, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd MOS
Pipe M3 and switch S1.Wherein:
As an optional embodiment of the utility model embodiment, the first metal-oxide-semiconductor M1 is P-channel metal-oxide-semiconductor；Second
Metal-oxide-semiconductor M2 is P-channel metal-oxide-semiconductor；Third metal-oxide-semiconductor M3 is P-channel metal-oxide-semiconductor.
As an optional embodiment of the utility model embodiment, I1=I2=I3 is set；Wherein, I1 first
Electric current, the I2 of metal-oxide-semiconductor M1 output are the electric current of the second metal-oxide-semiconductor M2 output, the electric current that I3 is third metal-oxide-semiconductor M3 output.Preferably,
In VCC=3.6V, it is 0.4uA that the I1, which can be set,.
Wherein, the static working current ID of driver D is generated by the second metal-oxide-semiconductor M2 electric current I2 exported and by I2 mirror image
Electric current composition.
The static working current IR of receiver R is by the third metal-oxide-semiconductor M3 electric current I3 exported and the electricity generated by I3 mirror image
Stream composition.
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 and third metal-oxide-semiconductor M3 form cmos current mirror, wherein I1=I2=I3.
Switch S1 is controlled by DE, and when DE is logic low, switch S1 is disconnected, and I2 cannot be input to driver D at this time, is driven
The static working current of dynamic device D is 0；When DE is logic high, switch S1 conducting, I2 is input to driver D, driver at this time
The quiescent current of D is ID；
Circuit in a receive mode when, by DE interface disconnect switch S1, at this time receiver R work, driver D closing,
The total static working current ICC1=I1+IR of circuit.
When circuit is in drive mode, by DE interface closure switch S1, receiver R is closed at this time, driver D work,
The total static working current ICC2=I1+IR+ID of circuit.
As an optional embodiment of the utility model embodiment, the static working current IR=3 of receiver R is set
×I3；200 × I2 of static working current ID < of driver D is set；In VCC=3.6V, I1 < 0.5uA is set；Receive mould
When formula, circuit is non-loaded total static working current ICC1=I1+IR；When drive mode, total static working current that circuit is non-loaded
ICC2=I1+IR+ID.As an optional embodiment of the utility model embodiment, in VCC=3.6V, mould is being received
When formula, the non-loaded total static working current ICC1 < 2uA of circuit is set.Preferably, in VCC=3.6V, setting ICC1 is
1.6uA.Specifically, static working current IR=3 × I3 of the low-power consumption receiver R of the utility model design；The low function of design
Consume 200 × I2 of static working current ID < of driver D；In VCC=3.6V, I1 < 0.5uA is typically the biasing I1 of design
0.4uA；Circuit is in VCC=3.6V, reception pattern, circuit is non-loaded total static working current ICC1=I1+IR < 2uA, allusion quotation
Type is 1.6uA；Circuit is in VCC=3.6V, drive mode, circuit is non-loaded total static working current ICC2=I1+IR+ID <
102uA。
Low-power consumption RS485 communication interface circuit provided by the embodiment of the utility model as a result, can use switch S1,
When driver does not work, switch S1 is disconnected, closes the operating current of driver D；Using the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2,
Third metal-oxide-semiconductor M3 controls the operating current of driver D, receiver R；It can be with the driver D of cooperating electric current optimization, reception
Device R realizes the purpose of the low-power consumption of the reception state of circuit.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of preferred embodiments of the present invention includes other realization, wherein can not be by shown or discussion
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be by this
The embodiment person of ordinary skill in the field of utility model is understood.
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Above embodiment is only that preferred embodiments of the present invention are described, not to the utility model
Range is defined, and under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel is to this reality
The various changes and improvements made with novel technical solution should all fall into the protection that claims of the utility model determine
In range.
Claims (7)
1. a kind of low-power consumption RS485 communication interface circuit characterized by comprising
First interface line A；
Second interface line B；
The first end of driver D, the driver D connect the first interface line A, and the second end of the driver D connects institute
Second interface line B is stated, the third end of the driver D connects DI interface, and the 4th end of the driver D connects DE interface；
The first end of receiver R, the receiver R connect the first interface line A, and the second end of the receiver R connects institute
Second interface line B is stated, the third end of the receiver R connects R0 interface, and the 4th end of the receiver R connects RE interface；
The drain electrode of first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 connects power supply VCC, and the source electrode of the first metal-oxide-semiconductor M1 connects institute
State the grid of the first metal-oxide-semiconductor M1；
The drain electrode of second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 connects power supply VCC, and the grid of the second metal-oxide-semiconductor M2 connects institute
State the grid of the first metal-oxide-semiconductor M1；
The drain electrode of third metal-oxide-semiconductor M3, the third metal-oxide-semiconductor M3 connect power supply VCC, and the grid of the third metal-oxide-semiconductor M3 connects institute
The grid of the first metal-oxide-semiconductor M1 and the grid of the second metal-oxide-semiconductor M2 are stated, the source electrode of the third metal-oxide-semiconductor M3 connects the reception
The 5th end of device R；
Switch S1, the first end of the switch S1 connect the source electrode of the second metal-oxide-semiconductor M2, the second end connection of the switch S1
The 5th end of the driver D；
Wherein, the switch S1 is cut-off by the DE Interface Controller.
2. circuit according to claim 1, which is characterized in that
The first metal-oxide-semiconductor M1 is P-channel metal-oxide-semiconductor；
The second metal-oxide-semiconductor M2 is P-channel metal-oxide-semiconductor；
The third metal-oxide-semiconductor M3 is P-channel metal-oxide-semiconductor.
3. circuit according to claim 1 or 2, which is characterized in that
I1=I2=I3 is set；Wherein, it is the second metal-oxide-semiconductor M2 output that I1, which is electric current, the I2 of the first metal-oxide-semiconductor M1 output,
Electric current, I3 be the third metal-oxide-semiconductor M3 output electric current.
4. circuit according to claim 3, which is characterized in that in VCC=3.6V, it is 0.4uA that the I1, which is arranged,.
5. circuit according to claim 3, which is characterized in that
Static working current IR=3 × I3 of the receiver R is set；
200 × I2 of static working current ID < of the driver D is set；
In VCC=3.6V, I1 < 0.5uA is set；
When reception pattern, circuit is non-loaded total static working current ICC1=I1+IR；
When drive mode, circuit is non-loaded total static working current ICC2=I1+IR+ID.
6. circuit according to claim 5, which is characterized in that
In VCC=3.6V, when reception pattern, the non-loaded total static working current ICC1 < 2uA of the circuit is set.
7. circuit according to claim 6, which is characterized in that
In VCC=3.6V, it is 1.6uA that the ICC1, which is arranged,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821213806.9U CN208384565U (en) | 2018-07-27 | 2018-07-27 | A kind of low-power consumption RS485 communication interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821213806.9U CN208384565U (en) | 2018-07-27 | 2018-07-27 | A kind of low-power consumption RS485 communication interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208384565U true CN208384565U (en) | 2019-01-15 |
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ID=64961771
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821213806.9U Active CN208384565U (en) | 2018-07-27 | 2018-07-27 | A kind of low-power consumption RS485 communication interface circuit |
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| Country | Link |
|---|---|
| CN (1) | CN208384565U (en) |
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2018
- 2018-07-27 CN CN201821213806.9U patent/CN208384565U/en active Active
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