CN216649688U - TTL signal long distance transmission circuit - Google Patents
TTL signal long distance transmission circuit Download PDFInfo
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- CN216649688U CN216649688U CN202220161847.8U CN202220161847U CN216649688U CN 216649688 U CN216649688 U CN 216649688U CN 202220161847 U CN202220161847 U CN 202220161847U CN 216649688 U CN216649688 U CN 216649688U
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- ttl signal
- distance transmission
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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 embodiment of the utility model discloses a TTL signal remote transmission circuit, which comprises a switch chip U37 and a receiving end conversion unit, wherein the switch chip U37 is connected with a sending end processor, the receiving end conversion unit is connected with a switch chip U37 through a transmission cable, and the receiving end conversion unit comprises an MOS tube Q4. The circuit of the embodiment of the utility model can realize the long-distance transmission of TTL signals, and has low power consumption, high transmission rate and wide application range.
Description
Technical Field
The utility model relates to the technical field of signal transmission circuits, in particular to a TTL signal long-distance transmission circuit.
Background
Transistor-Transistor Logic (TTL) signals of a chip can only transmit a few meters or more than ten meters generally, for example, a common MCU directly drives a signal line by IO, actual measurement does not exceed 7 meters, and the MCU may be down when the signal line is too long; the driving capability of a TTL signal of a CPU is weaker, the existing transmission improvement modes for the TTL signal comprise two modes, one mode is that the driving capability of the TTL signal is increased by using an MOS tube for level conversion, namely, the level of the signal is increased by the MOS tube at a transmitting side, and the level conversion is also performed by the MOS tube at a receiving side to be converted into a working level signal at the receiving side; in addition, the level of TTL is converted into the level of another mode, and a level conversion standard interface chip such as RS485 or RS232 is commonly used, which also aims to solve the problem that TTL cannot implement long-distance transmission, but the interface chip can only be used for an interface of UART, and protocols such as GPIO, PMW, I2C cannot support the interface chip, and the two chips have high prices, and 1 corresponding chip needs to be added to each of the transmitting side and the receiving side. And RS485 works in half duplex mode, the rate is limited, RS485 easily loses packets under the condition of high rate, and an RS485/RS422 chip is large in size and high in power consumption.
Therefore, it is necessary to design a new circuit to implement the long-distance transmission of TTL signals, with low power consumption, high transmission rate, and wide application range.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a TTL signal long-distance transmission circuit.
In order to solve the technical problems, the utility model aims to realize the following technical scheme: the TTL signal remote transmission circuit comprises a switch chip U37 and a receiving end conversion unit, wherein the switch chip U37 is connected with a sending end processor, the receiving end conversion unit is connected with the switch chip U37 through a transmission cable, and the receiving end conversion unit comprises a MOS (metal oxide semiconductor) tube Q4.
The further technical scheme is as follows: the model of the switch chip U37 is BL 1551.
The further technical scheme is as follows: the switch chip U37 is connected with a resistor R15.
The further technical scheme is as follows: the resistor R15 is connected to a first power supply.
The further technical scheme is as follows: the MOS tube Q4 is connected with a receiving end processor.
The further technical scheme is as follows: the source electrode of the MOS tube Q4 is connected with the switch chip U37 through a transmission cable.
The further technical scheme is as follows: the gate of the MOS transistor Q4 is connected with a second power supply through a pull-up resistor R13.
The further technical scheme is as follows: the drain electrode of the MOS tube Q4 is connected with the receiving end processor through a pull-up resistor R14.
The further technical scheme is as follows: the source of the MOS transistor Q4 is connected with the second power supply through a pull-up resistor R12.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the switch chip U37 and the receiving end conversion unit are arranged, the switch chip U37 is connected with the sending end processor, the receiving end conversion unit is connected with the switch chip U37 through a transmission cable, the receiving end conversion unit comprises the MOS tube Q4, and the switch chip U37 has strong signal line driving capability, so that the long-distance transmission of TTL signals can be realized, the power consumption is low, the transmission rate is high, and the application range is wide.
The utility model is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a TTL signal long-distance transmission circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a TTL signal long-distance transmission circuit according to an embodiment of the present invention;
fig. 3 is a schematic terminal diagram of a switch chip U37 according to an embodiment of the present invention;
the labels in the figures illustrate:
10. a sending end processor; 20. a first power supply; 30. a receiving end conversion unit; 40. a second power supply; 50. and a receiving end processor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic block diagram of a TTL signal long-distance transmission circuit according to an embodiment of the present invention, which can be applied to TTL signal transmission, and in particular, to simplex TTL signal transmission, such as the long-distance transmission of TTL signals like UART, PMW, GPIO, etc.
Referring to fig. 1, the TTL signal long-distance transmission circuit includes a switch chip U37 and a receiving end conversion unit 30, the switch chip U37 is connected to the transmitting end processor 10, the receiving end conversion unit 30 is connected to the switch chip U37 through a transmission cable, and the receiving end conversion unit 30 includes a MOS transistor Q4.
In an embodiment, referring to fig. 2, the switch chip U37 is of a type BL 1551.
Referring to fig. 3, the switch chip U37 is a single-unit low-voltage single-pole double-throw analog switch produced by beiling, SC70-6 package, with a bandwidth of 300 Mhz. The switching time Ton is 12ns, Toff is 5ns, and the transmission requirement of high-speed signals can be met. The continuous current of A1 or A2 to B in the switch chip U37 is 200mA at most. The strong signal line driving capability can realize the long-distance transmission of signals, and when the state of the switch chip U37 is 1, the terminal pin a1 is connected with the terminal pin B, and when the state of the switch chip U37 is 0, the terminal pin a2 is connected with the terminal pin B.
In an embodiment, referring to fig. 2, the switch chip U37 is connected to a resistor R15.
In one embodiment, the resistor R15 is connected to the first power source 20.
The resistor R15 and the switch chip U37 form a conversion circuit at a transmitting end, the switch chip U37 is powered by a 5V power supply, an A1 terminal pin of the switch chip U37 is connected to a 5V first power supply 20 through a resistor R15, the resistance value of the resistor R15 can be adjusted according to the actual length requirement, an A2 terminal pin of the switch chip U37 is connected to GND, a TX _ SOURCE signal of the processor is connected to a pin 6 ENB of the switch chip U37, and a pin 4B is an output pin of long-distance transmission of the equipment.
In one embodiment, referring to fig. 2, the MOS transistor Q4 is connected to the receiving processor 50.
In an embodiment, referring to fig. 2, the source of the MOS transistor Q4 is connected to the switch chip U37 through a transmission cable.
In an embodiment, referring to fig. 2, the gate of the MOS transistor Q4 is connected to the second power source 40 through a pull-up resistor R13.
In one embodiment, referring to fig. 2, the drain of the MOS transistor Q4 is connected to the receiving-side processor 50 through a pull-up resistor R14.
In an embodiment, referring to fig. 2, the source of the MOS transistor Q4 is connected to the second power source 40 through a pull-up resistor R12.
The pull-up resistors R12, R13, R14 and the MOS transistor Q4 are conversion circuits at the receiving end, wherein the MOS transistor Q4 is an N-MOS transistor, the switching frequency of the N-MOS transistor is also 2 times the signal rate, 3V3 is the working voltage of the processor 50 at the receiving end, and different voltage values can be set according to actual requirements. The pull-up resistors R12, R13, and R14 are all 10K ohms, and mainly perform the functions of pulling up and limiting current, wherein the pin 3(S) of the MOS transistor Q4 is connected to the external input interface, i.e., the switch chip U37, and is pulled up to the second power supply 40 of 5V through the pull-up resistor R12, the pin 1(G) of the MOS transistor Q4 is pulled up to the second power supply 40 of 5V through the pull-up resistor R13, and the pin 2(D) of the MOS transistor Q4 is pulled up to the operating voltage of the receive processor 50 through R14 and is connected to the receive pin of the receive processor 50, wherein from top to bottom, the first thick LINE portion TX _ LINE is a long-distance transmission cable portion, and the second thick LINE portion is a common ground signal of the transmitting end and the receiving end.
The working principle of the whole circuit is as follows: when the TX _ SOURCE of the sending-end processor 10 outputs a high level, that is, the ENB pin of the switch chip U37 is a high level, the B pin is connected to the a1 pin, the B pin outputs a high level signal, the high level signal of the B pin reaches the 3(S) pin of the MOS transistor Q4 of the receiving end, the MOS transistor Q4 is turned off, the 2(D) pin of the MOS transistor Q4 is in a high level state corresponding to the pull-up level, and the receiving-end processor 50 receives the high level signal; when the TX _ SOURCE of the sending-end processor 10 outputs a low level, i.e., the ENB pin of the switch chip U37 is a low level, the B pin is connected to the a2 pin, the B pin outputs a low level signal, the low level signal of the B pin reaches the 3(S) pin of the MOS transistor Q4 at the receiving end, the MOS transistor Q4 is turned on, the 2(D) pin of the MOS transistor Q4 is turned on with the 3(S) pin of the MOS transistor Q4, the 2(D) pin of the MOS transistor Q4 is a low level state, and the receiving-end processor 50 receives the low level signal, thereby completing the transmission of the TTL signal.
The circuit of BL1551 chip and MOS pipe is used to realize the long distance transmission of TTL signal, the distance is more than 100+ meter, the actual measurement can reach 100 meter, the circuit can be applied to the long distance transmission of TTL signal interfaces such as UART interface, GPIO, I2C, etc., the cost is low, the circuit is simple, and the power consumption is low.
According to the TTL signal long-distance transmission circuit, the switch chip U37 is connected with the sending end processor 10 by arranging the switch chip U37 and the receiving end conversion unit 30, the receiving end conversion unit 30 is connected with the switch chip U37 through a transmission cable, the receiving end conversion unit 30 comprises the MOS tube Q4, the strong signal line driving capacity of the switch chip U37 can be achieved, the TTL signal long-distance transmission can be achieved, the power consumption is low, the transmission rate is high, and the application range is wide.
While the utility model has been described with reference to specific embodiments, the utility model is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the utility model. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
- The TTL signal remote transmission circuit is characterized by comprising a switch chip U37 and a receiving end conversion unit, wherein the switch chip U37 is connected with a sending end processor, the receiving end conversion unit is connected with the switch chip U37 through a transmission cable, and the receiving end conversion unit comprises an MOS (metal oxide semiconductor) tube Q4.
- 2. The TTL signal long distance transmission circuit of claim 1, wherein the switch chip U37 is of type BL 1551.
- 3. The TTL signal long distance transmission circuit of claim 2, wherein a resistor R15 is connected to the switch chip U37.
- 4. The TTL signal long distance transmission circuit of claim 3, wherein the resistor R15 is connected to a first power supply.
- 5. The TTL signal long distance transmission circuit of claim 1, wherein a receiver processor is connected to the MOS transistor Q4.
- 6. The TTL signal long-distance transmission circuit of claim 5, wherein the source of the MOS transistor Q4 is connected to the switch chip U37 through a transmission cable.
- 7. The TTL signal long distance transmission circuit of claim 6, wherein the gate of the MOS transistor Q4 is connected to a second power supply through a pull-up resistor R13.
- 8. The TTL signal long distance transmission circuit of claim 7, wherein the drain of the MOS transistor Q4 is connected to the receiving end processor through a pull-up resistor R14.
- 9. The TTL signal long distance transmission circuit of claim 8, wherein the source of the MOS transistor Q4 is connected to the second power supply through a pull-up resistor R12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220161847.8U CN216649688U (en) | 2022-01-20 | 2022-01-20 | TTL signal long distance transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220161847.8U CN216649688U (en) | 2022-01-20 | 2022-01-20 | TTL signal long distance transmission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216649688U true CN216649688U (en) | 2022-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220161847.8U Active CN216649688U (en) | 2022-01-20 | 2022-01-20 | TTL signal long distance transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216649688U (en) |
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2022
- 2022-01-20 CN CN202220161847.8U patent/CN216649688U/en active Active
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Address after: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee after: Guangzhou Tongze Kangwei Technology Co.,Ltd. Address before: 510000 room 1301, No. 37, Jinlong street, Xiangjiang financial and business center, Nansha District, Guangzhou City, Guangdong Province (office only) Patentee before: Guangzhou Tongze Kangwei Intelligent Technology Co.,Ltd. |