CN207039564U - A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly - Google Patents
A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly Download PDFInfo
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- CN207039564U CN207039564U CN201720815116.XU CN201720815116U CN207039564U CN 207039564 U CN207039564 U CN 207039564U CN 201720815116 U CN201720815116 U CN 201720815116U CN 207039564 U CN207039564 U CN 207039564U
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Abstract
The half-duplex of the utility model design is anti-to disturb infrared serial interface circuit certainly, when U4 receives data, OUT just exports low level, IR_TX and IR_RX meets the serial ports TX and RX of the infrared transmission equipment of outside need, by taking two modules as an example, the two modules are divided into modules A and module B, when the IR_TX of modules A sends 0, IR_TX exports low level, Q6 is turned off, Q5 intermittences light D18 emitting heads and send data, reception plate module B reception head U4 OUT when receiving data export low level, module B OUT terminal and its IR_TX mono- low one are high, turn on Q7, so that IR_RX inputs for low level, 0 slave module A module B has been sent to；When sending 1, the IR_TX output high level of modules A, Q6 is turned on, and 38K carrier waves are short-circuited to ground, Q5 shut-offs, D18 does not work, data are not sent, and receiving plate module B U4 does not have OUT acquiescences during data output to export high level, turns off Q7, module B IR_RX input high levels in the presence of 3V3 power supplys, receiving terminal has been sent to by 1 from transmitting terminal.
Description
Technical field
A kind of wireless telecommunications system is the utility model is related to, more particularly to a kind of half-duplex is prevented disturbing infrared serial interface circuit certainly.
Background technology
Currently when being carried out using infrared light with frequency half duplex communication, because data transmit-receive is in same frequency range, oneself transmitting
The data that hair is sent, the reception head of oneself can also receive, so as to generate data interference, by taking MCU serial communications as an example, infrared head
When IR_TX glistens and sends data, itself, which receives head IR_RX, can also receive IR_TX data, and current technology means are usual
All it is to solve this problem in software view, such as, infrared communication is to be used for MCU serial communications, then only need to be when sending data
Serial ports is set to close to receive and interrupt, to prevent that the demodulation for itself receiving head is delayed after having sent, the kernel open string mouth again that is slightly delayed connects
Receipts, but wireless telecommunications system is substantially used as a kind of hardware device, the most important seeks to possess versatility, from working as
For preceding case, this IR_ plate for being done, which seeks to reserve serial ports, is connected to the external equipment for needing IR_ to communicate（MCU）On,
Transparent transmission is realized, without external equipment（MCU）In order that upgrading its code with infrared communication IR_ plates, pole can be so caused
The earth inconvenience.
Utility model content
The utility model aims to provide a kind of serial port circuit that the stable infrared transparent transmission of half-duplex is realized from hardware view.
To realize above-mentioned technical purpose, the utility model uses following technical scheme, and a kind of half-duplex is anti-to disturb infrared string certainly
Mouth circuit, including infrared emission serial ports IR_TX and infrared receiver serial ports IR_RX, IR_TX and IR_RX connect outside need respectively
The serial ports TX and RX of infrared transmission equipment, the base stage of the IR_TX difference connecting triodes Q6 and triode Q7 base stage, Q6
Grounded emitter and connect another triode Q5 emitter stage, and Q6 colelctor electrode difference connecting triode Q5 base stage and
One resistance R22, resistance the R22 other end connect a 38KHz carrier circuit, and described triode Q5, Q6, Q7 are NPN type
Triode, triode Q5 colelctor electrode connect infrared emission head D18 negative pole, infrared emission head D18 positive pole connection electricity
R25 is hindered, resistance R25 other end connection power supply, resistance R24, resistance R24 connections IR_TX are connected between IR_TX and Q6 base stage
One end be also connected with resistance R30, resistance R30 other end connection power supply, also connect between the base stage and IR_TX of the triode Q7
There is resistance R31, diode D19, diode D19 positive pole connection resistance R31, negative pole connection are connected between resistance R31 and IR_TX
Resistance R33 is parallel with IR_TX, diode D19, resistance R31 connections diode D19 in parallel and resistance R33 one end also connects
Electric capacity a C13, C13 other end ground connection are connect, one end of resistance R31 connecting triode Q7 base stages has been also connected with resistance R34,
R34 other end ground connection, the colelctor electrode of the triode Q7 connect IR_RX and resistance R32, R32 other end connection electricity respectively
Source, triode Q7 emitter stage connection infrared receiver probe U4 OUT terminal, infrared receiver probe U4 VCC ends connection electric capacity C11
With resistance R26, resistance R26 other end connection power supply, the electric capacity C11 other end is grounded and connects infrared receiver probe U4's
GND ends.
Preferably, described infrared receiver probe U4 uses HS0038A2 infrared receiver probes.
Preferably, described triode Q5, Q6, Q7 is 9013 type triodes.
Preferably, the power supply of resistance R25, R26, R30, R31 connection is 3V3 power supplys
The half-duplex of the utility model design is anti-from infrared serial interface circuit is disturbed, and when U4 receives data, OUT is just exported low
Level, IR_TX and IR_RX meet the serial ports TX and RX of the infrared transmission equipment of outside need, by taking two modules as an example, the two moulds
Block is divided into modules A and module B, and when the IR_TX of modules A sends 0, IR_TX output low levels, Q6 shut-offs, Q5 is in 38K carrier waves
Lower intermittent conduction/the shut-off of control sends data so as to which intermittence lights D18 emitting heads, and the reception head U4 for receiving plate module B exists
OUT exports low level when receiving data, because being half duplex communication, receiver board is that will not send data simultaneously when receiving
, so its module B IR_TX pins acquiescence exports high level when receiving（Serial bus agreement is given tacit consent to when not sending data
Export high level）, module B OUT terminal and its IR_TX mono- low one are high, turn on Q7, so that IR_RX inputs for low level,
0 slave module A module B has been sent to successfully thus；When sending 1, the IR_TX output high level of modules A, Q6 conductings,
38K carrier waves are short-circuited to ground, Q5 shut-offs, and D18 does not work, i.e., data is not sent, when the U4 for receiving plate module B does not have data output
OUT acquiescence output high level, turns off Q7, the module B IR_RX input high level in the presence of 3V3 power supplys, thus succeeds
Ground has been sent to receiving terminal by 1 from transmitting terminal.
When ideally the IR_TX of modules A sends 0, the Q7 of itself plank is not turned on because base stage inputs 0,
So its IR_RX is always high level, then sees that D18 will not light when sending 1, U4 OUT can not receive data output height, and Q7 is also
It is to be not turned on, so IR_RX or height, to sum up, no matter IR_TX sends 0 or 1, and the IR_RX of itself is not in an ideal case
Data can be received；But it is actual its own transmission hair light to be considered when sending and receives head OUT outputs low level have time delay, and
Be not at the same, so when IR_TX data bit jumps to 1 from 0, Q7 base stages are that the previous positions of 1, IRTX are sent in the case of 1
Be 0, then the low level of OUT delays output is to Q7 emitter stages, combines the 1 of base stage with regard to that can turn on Q7, then the 0 of OUT outputs
With regard to that can be output into inside the IR_RX of itself, so as to interfere, in order to solve the interference that the delay of this reception head is brought, this
The base stage designed in Q7 has added a C13 to be delayed for phase shift, and the Q7 of so itself plank is never turned on, because working as
During Q7 base stages delay input 1, receive head OUT delay output 0 is over, hereafter OUT be output to emitter stage and 1, lead
Q7 is caused to turn on, and when IRTX sends 0 and arrives base stage, Q7 is absolutely not turned on, so as to receive the dry of an OUT delay output
IR_RX receiving terminals can not be reached due to the delay of Q7 state changes by disturbing level, when wherein C13 sizes are according to required delay
Between calculate gained, so, either IR_TX output 0 or 1 or switching during, can use of the present utility model
Circuit is as the stable infrared transparent transmission module of serial ports.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 is the circuit diagram of the utility model embodiment；
Fig. 2 is the schematic diagram for two modules for carrying the utility model serial port circuit.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the utility model, and it is not intended that to of the present utility model
Limitation.
In description of the present utility model, unless otherwise prescribed with restriction, it is necessary to explanation, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be mechanical connection or the company of electrical connection or two element internals
It is logical, can be joined directly together, can also be indirectly connected by intermediary.For the ordinary skill in the art, may be used
To understand the concrete meaning of above-mentioned term as the case may be.
A kind of half-duplex shown in Figure 1 is anti-from disturbing infrared serial interface circuit, including infrared emission serial ports IR_TX and infrared
Receive the serial ports TX and RX that serial ports IR_RX, IR_TX and IR_RX connect the infrared transmission equipment of outside need respectively, the IR_TX
Connecting triode Q6 base stage and triode Q7 base stage, Q6 grounded emitter and the hair for connecting another triode Q5 respectively
Emitter-base bandgap grading, and Q6 colelctor electrode difference connecting triode Q5 base stage and a resistance R22, the resistance R22 other end connect one
38KHz carrier circuits, described triode Q5, Q6, Q7 are NPN type triode, and triode Q5 colelctor electrode connection is one infrared
Emitting head D18 negative pole, infrared emission head D18 positive pole connection resistance R25, resistance R25 other end connection power supply, IR_TX
Resistance R24 is connected between Q6 base stage, resistance R24 connections IR_TX one end is also connected with resistance R30, the resistance R30 other end
Power supply is connected, resistance R31 is also connected between the base stage and IR_TX of the triode Q7, two are connected between resistance R31 and IR_TX
Pole pipe D19, diode D19 positive pole connection resistance R31, negative pole connect IR_TX, are parallel with resistance R33 on diode D19, electricity
Resistance R31 connections diode D19 in parallel and resistance R33 one end is also connected with electric capacity a C13, C13 other end ground connection, resistance
One end of R31 connecting triode Q7 base stages has been also connected with resistance R34, R34 other end ground connection, the colelctor electrode of the triode Q7
IR_RX and resistance R32, R32 other end connection power supply, triode Q7 emitter stage connection infrared receiver probe U4 are connected respectively
OUT terminal, infrared receiver probe U4 VCC ends connection electric capacity C11 and resistance R26, resistance R26 the other end connection power supply, electricity
The other end for holding C11 is grounded and connects infrared receiver probe U4 GND ends.
Preferably, described infrared receiver probe U4 uses HS0038A2 infrared receiver probes.
Preferably, described triode Q5, Q6, Q7 is 9013 type triodes.
Preferably, the power supply of resistance R25, R26, R30, R31 connection is 3V3 power supplys
The half-duplex of the utility model design is anti-from infrared serial interface circuit is disturbed, and when U4 receives data, OUT is just exported low
Level, IR_TX and IR_RX meet the serial ports TX and RX of the infrared transmission equipment of outside need, by taking two modules as an example, the two moulds
Block is divided into modules A and module B, and when the IR_TX of modules A sends 0, IR_TX output low levels, Q6 shut-offs, Q5 is in 38K carrier waves
Lower intermittent conduction/the shut-off of control sends data so as to which intermittence lights D18 emitting heads, and the reception head U4 for receiving plate module B exists
OUT exports low level when receiving data, because being half duplex communication, receiver board is that will not send data simultaneously when receiving
, so its module B IR_TX pins acquiescence exports high level when receiving（Serial bus agreement is given tacit consent to when not sending data
Export high level）, module B OUT terminal and its IR_TX mono- low one are high, turn on Q7, so that IR_RX inputs for low level,
0 slave module A module B has been sent to successfully thus；When sending 1, the IR_TX output high level of modules A, Q6 conductings,
38K carrier waves are short-circuited to ground, Q5 shut-offs, and D18 does not work, i.e., data is not sent, when the U4 for receiving plate module B does not have data output
OUT acquiescence output high level, turns off Q7, the module B IR_RX input high level in the presence of 3V3 power supplys, thus succeeds
Ground has been sent to receiving terminal by 1 from transmitting terminal.
When ideally the IR_TX of modules A sends 0, the Q7 of itself plank is not turned on because base stage inputs 0,
So its IR_RX is always high level, then sees that D18 will not light when sending 1, U4 OUT can not receive data output height, and Q7 is also
It is to be not turned on, so IR_RX or height, to sum up, no matter IR_TX sends 0 or 1, and the IR_RX of itself is in an ideal case
Data will not be received；But it is actual its own transmission hair light to be considered when sending and receives head OUT outputs low level have time delay,
Be not at the same, so when IR_TX data bit jumps to 1 from 0, Q7 base stages are the previous position hairs of 1, IRTX in the case of 1
What is sent is 0, then the low level of OUT delays output is to Q7 emitter stages, combine the 1 of base stage with regard to that can turn on Q7, then OUT outputs
0 with regard to that can be output into inside the IR_RX of itself, so as to interfere, in order to solve the interference that the delay of this reception head is brought, this
The base stage designed in Q7 has added a C13 to be delayed for phase shift, and the Q7 of so itself plank is never turned on, because working as
During Q7 base stages delay input 1, receive head OUT delay output 0 is over, hereafter OUT be output to emitter stage and 1, lead
Q7 is caused to turn on, and when IRTX sends 0 and arrives base stage, Q7 is absolutely not turned on, so as to receive the dry of an OUT delay output
IR_RX receiving terminals can not be reached due to the delay of Q7 state changes by disturbing level, when wherein C13 sizes are according to required delay
Between calculate gained, so, either IR_TX output 0 or 1 or switching during, can use of the present utility model
Circuit is as the stable infrared transparent transmission module of serial ports.
In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc.
Refer to and be contained in of the present utility model at least one with reference to specific features, structure, material or the feature that the embodiment or example describe
In individual embodiment or example.In this manual, identical embodiment is not necessarily referring to the schematic representation of above-mentioned term
Or example.Moreover, specific features, structure, material or the feature of description in any one or more embodiments or can be shown
Combined in an appropriate manner in example.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that：
These embodiments can be carried out with a variety of changes, modification in the case where not departing from principle and objective of the present utility model, replaced
And modification, the scope of the utility model are limited by claim and its equivalent.
Claims (4)
1. a kind of half-duplex is anti-to disturb infrared serial interface circuit, including infrared emission serial ports IR_TX and infrared receiver serial ports IR_RX certainly,
IR_TX and IR_RX connects the serial ports TX and RX of the infrared transmission equipment of outside need respectively, it is characterised in that the IR_TX points
Other connecting triode Q6 base stage and triode Q7 base stage, Q6 grounded emitter and the transmitting for connecting another triode Q5
Pole, and Q6 colelctor electrode difference connecting triode Q5 base stage and a resistance R22, the resistance R22 other end connect one
38KHz carrier circuits, described triode Q5, Q6, Q7 are NPN type triode, and triode Q5 colelctor electrode connection is one infrared
Emitting head D18 negative pole, infrared emission head D18 positive pole connection resistance R25, resistance R25 other end connection power supply, IR_TX
Resistance R24 is connected between Q6 base stage, resistance R24 connections IR_TX one end is also connected with resistance R30, the resistance R30 other end
Power supply is connected, resistance R31 is also connected between the base stage and IR_TX of the triode Q7, two are connected between resistance R31 and IR_TX
Pole pipe D19, diode D19 positive pole connection resistance R31, negative pole connect IR_TX, are parallel with resistance R33 on diode D19, electricity
Resistance R31 connections diode D19 in parallel and resistance R33 one end is also connected with electric capacity a C13, C13 other end ground connection, resistance
One end of R31 connecting triode Q7 base stages has been also connected with resistance R34, R34 other end ground connection, the colelctor electrode of the triode Q7
IR_RX and resistance R32, R32 other end connection power supply, triode Q7 emitter stage connection infrared receiver probe U4 are connected respectively
OUT terminal, infrared receiver probe U4 VCC ends connection electric capacity C11 and resistance R26, resistance R26 the other end connection power supply, electricity
The other end for holding C11 is grounded and connects infrared receiver probe U4 GND ends.
2. the serial port circuit described in claim 1, it is characterised in that described infrared receiver probe U4 is infrared using HS0038A2
Receiving transducer.
3. the serial port circuit described in claim 1, it is characterised in that described triode Q5, Q6, Q7 is the pole of 9013 type three
Pipe.
4. the serial port circuit described in claim 1, it is characterised in that the power supply of resistance R25, R26, R30, R31 connection is 3V3
Power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720815116.XU CN207039564U (en) | 2017-07-07 | 2017-07-07 | A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly |
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| CN201720815116.XU CN207039564U (en) | 2017-07-07 | 2017-07-07 | A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly |
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| CN207039564U true CN207039564U (en) | 2018-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517053A (en) * | 2017-07-07 | 2017-12-26 | 中兴软创科技股份有限公司 | A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517053A (en) * | 2017-07-07 | 2017-12-26 | 中兴软创科技股份有限公司 | A kind of half-duplex is anti-to disturb infrared serial interface circuit certainly |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 210012 room 627, Ning Shuang Road, Yuhuatai District, Nanjing, Jiangsu, 627 Patentee after: Ho whale cloud computing Polytron Technologies Inc Address before: 210012 No. 68 Bauhinia Road, Yuhuatai District, Jiangsu, Nanjing Patentee before: ZTEsoft Technology Co., Ltd. |
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| CP03 | Change of name, title or address |