CN207601787U - Serial expanded circuit - Google Patents
Serial expanded circuit Download PDFInfo
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- CN207601787U CN207601787U CN201721796383.3U CN201721796383U CN207601787U CN 207601787 U CN207601787 U CN 207601787U CN 201721796383 U CN201721796383 U CN 201721796383U CN 207601787 U CN207601787 U CN 207601787U
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Abstract
The utility model discloses a kind of serial expanded circuits, and including 4 channel analog multiplexer of two-way, the input terminal of 4 channel analog multiplexer of two-way connects the I/O port and serial ports of MCU, output 4 road serial ports of connection respectively.The utility model realizes serial ports expansion with 4 channel analog multiplexer of two-way, in I/O port anxiety, I/O port chip can also be turned with I2C and realize I/O port extension, can keep original MCU constant in this way, the change above circuit is reduced, also can allow software that can preferably transplant；The serial ports carried with MCU makes communication more stable；The occupancy quantity of I/O port can be substantially reduced, two I/O ports is only needed to can be achieved with the extension of 4 serial ports, in this embodiment it is not even necessary to which I/O port can also realize the extension of 4 serial ports.
Description
Technical field
The utility model belongs to electronic circuit technology field, and in particular to a kind of serial expanded circuit.
Background technology
In our system, often it is divided into two large divisions, a part is exactly master control borad, and another part is exactly function mould
Block.Master control borad needs go to control each function module or obtain the working condition of each function module and report information.So
In this process, it will certainly communicate.Most commonly used at present is exactly serial communication.But the serial ports of general microcontroller
Quantity is limited, and generally only 1 to 2 serial ports can be for users to use.If necessary to monitor more function modules or
Change the MCU of more serial ports or extended serial port of trying every possible means.Obviously replacement MCU methods implement more complicated, and cost is more
Height, because of the problems such as this further relates to change of software architecture etc..
Have in the prior art and serial ports is switched into the method that network interface communicates, but this method has the disadvantages that：1st, into
This height, each function module are required for a serial ports to turn network interface chip, it is also necessary to an exchange chip, 2, EMI it is big, the spoke of network interface
Penetrate bigger than serial ports, it is exceeded to be easy to cause EMI, 3, circuit implement complexity.In addition, the I/O port of also useful monolithic in the prior art
The method of simulative serial port communication, this method have the disadvantages that：1st, stability is poor, and the stability of serial ports is closed with the technology of programmer
System is very big, it is easy to and communication is caused to malfunction, 2, poor anti jamming capability, producer, which can do, above included serial port circuit optimizes, and makes to lead to
Believe it is more stable, 3, communication speed it is slow because to need to simulate by software, response speed is very slow, 4, I/O port occupy quantity
It is more, each serial ports be required for occupy two I/O port resources, 5, EDA wiring difficulty increase.
Utility model content
The utility model technical issues that need to address are to provide the serial ports expansion that a kind of I/O port using MCU is extended
Circuit.
To solve the above problems, technical solution adopted in the utility model is：
A kind of serial expanded circuit, including 4 channel analog multiplexer of two-way, 4 channel analog multiplexer of two-way
Input terminal connect the I/O port and serial ports of MCU, output 4 road serial ports of connection respectively.
Further, it further includes I2C and turns I/O port chip, the I2C that the I2C turns the input terminal connection MCU of I/O port chip is defeated
Outlet, I2C turns the input terminal of output terminal connection 4 channel analog multiplexer of two-way of I/O port chip, to replace the IO of MCU
Mouthful.
Further, 4 channel analog multiplexer of two-way is SN74LV4052, the pin 1- of SN74LV4052
COM, 2-COM are connected respectively with the serial ports RXD and TXD of MCU, and output pin mouth 1Y0,2Y0 and serial ports 1 of SN74LV4052 connect
It connects, 1Y1,2Y1 and serial ports 2 connect, and 1Y2,2Y2 and serial ports 3 connect, and 1Y3,2Y4 and serial ports 4 connect.
Further, the I2C turns I/O port chip as PCA9554D.
It is using advantageous effect caused by above-mentioned technical proposal：
The utility model realizes serial ports expansion with 4 channel analog multiplexer of two-way, can be in I/O port anxiety
Turn I/O port chip with I2C and realize that I/O port extends, can keep original MCU constant in this way, reduce the change above circuit, also can
Software can preferably be transplanted；The serial ports carried with MCU makes communication more stable；The occupancy quantity of I/O port can be substantially reduced, only
Two I/O ports is needed to can be achieved with the extension of 4 serial ports, in this embodiment it is not even necessary to which I/O port can also realize the extension of 4 serial ports.
Description of the drawings
Fig. 1 is the utility model circuit block diagram；
Fig. 2 is one embodiment circuit diagram of the utility model；
Fig. 3 is another embodiment circuit diagram of the utility model.
Specific embodiment
Utility model is described in further detail below in conjunction with the accompanying drawings：
The utility model is a kind of serial expanded circuit, and serial ports expansion is realized using 4 channel analog multiplexer of two-way,
Even turn I/O port chip with I2C and realize that I/O port extends, in the case where not changing former MCU, realize one point 4, one point 8 or even one
Divide 16 serial ports expansion.At low cost, circuit is simple, and communication is stablized, and software maintenance is convenient, is not take up I/O resource or only takes up a small amount of
I/O resource.
As shown in Figure 1, a kind of serial expanded circuit, turns I/O port core including 4 channel analog multiplexer of two-way and I2C
Piece, the input terminal of 4 channel analog multiplexer of two-way connect the I/O port and serial ports of MCU, output 4 road serial ports of connection respectively.
The I2C turns the I2C output terminals of the input terminal connection MCU of I/O port chip, and the output terminal connection two-way 4 that I2C turns I/O port chip is logical
The input terminal of road analog multiplexer when the I/O port deficiency of MCU, can replace the I/O port of MCU.
As shown in Fig. 2, 4 channel analog multiplexer of two-way of the utility model is SN74LV4052, SN74LV4052
Pin 1-COM, 2-COM be connected respectively with the serial ports RXD and TXD of MCU, output pin mouth 1Y0,2Y0 of SN74LV4052
It is connected with serial ports 1,1Y1,2Y1 and serial ports 2 connect, and 1Y2,2Y2 and serial ports 3 connect, and 1Y3,2Y4 and serial ports 4 connect.The I2C
Turn I/O port chip as PCA9554D (referring to Fig. 3).
Operation principle：
As shown in figure 3, U1 turns I/O port chip PCA9554D for IIC, it can support that IIC turns 8 road I/O ports all the way.This chip can be
MCU does not have to use during extra I/O port.Because often extending 4 serial ports needs two I/O ports.If MCU can be used without extra I/O port
This chip.Utilize expansible 16 serial ports of the chip.
U2 is SN74LV4052, is 4 channel analog multiplexer of two-way, he utilizes two control terminals of A, B, can be with
Carry out the multiplexing switching of multichannel.Because MCU communications is all Transistor-Transistor Logic level, just serial ports can be realized using this function
Extension.4 channel analog multiplexer U2 chips of two-way are there are two public port, respectively 1-COM and 2-COM, by the two
Port is connected respectively with the serial ports RXD of MCU with TXD.Delivery outlet 1Y0,2Y0 of chip are connected with serial ports COM1,1Y1,2Y1 and
Serial ports COM2 connections, and so on, the serial ports of such a MCU can control four serial ports.General MCU carries 2 serial ports,
Such a MCU can both control 8 serial ports.If necessary to which more serial ports can also (two-way 4 be logical by concatenating two chips
Road analog multiplexer) it realizes.
4 channel analog multiplexer U2 chips of two-way are there are two control terminal, respectively A and B, when A and B is low level
When, i.e. during AB=00,1-COM and 1Y0 conductings, 2-COM and 2Y0 conductings realize the communication function of MCU and serial ports COM1.
When A is low level, and B is high level, i.e. during AB=01,1-COM and 1Y1 conductings, 2-COM and 2Y1 conductings.That is MCU and serial ports
The communication of COM2.And so on.Only it need to control the level of A and B that can freely select to communicate with which serial ports.
Claims (3)
1. a kind of serial expanded circuit, it is characterised in that：Including 4 channel analog multiplexer of two-way, 4 tunnels analogy of two-way is more
The input terminal of path multiplexer connects the I/O port and serial ports of MCU, output 4 road serial ports of connection respectively, and the I2C turns I/O port chip
Input terminal connects the I2C output terminals of MCU, and I2C turns the defeated of output terminal connection 4 channel analog multiplexer of two-way of I/O port chip
Enter end, to replace the I/O port of MCU.
2. serial expanded circuit according to claim 1, it is characterised in that 4 channel analog multiplexer of two-way is
Pin 1-COM, 2-COM of SN74LV4052, SN74LV4052 are connected respectively with the serial ports RXD and TXD of MCU,
Output pin mouth 1Y0,2Y0 and serial ports 1 of SN74LV4052 is connected, and 1Y1,2Y1 and serial ports 2 connect, and 1Y2,2Y2 and serial ports 3 connect
It connects, 1Y3,2Y4 and serial ports 4 connect.
3. serial expanded circuit according to claim 2, it is characterised in that the I2C turns I/O port chip as PCA9554D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721796383.3U CN207601787U (en) | 2017-12-20 | 2017-12-20 | Serial expanded circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721796383.3U CN207601787U (en) | 2017-12-20 | 2017-12-20 | Serial expanded circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207601787U true CN207601787U (en) | 2018-07-10 |
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ID=62766001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721796383.3U Active CN207601787U (en) | 2017-12-20 | 2017-12-20 | Serial expanded circuit |
Country Status (1)
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| CN (1) | CN207601787U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114116566A (en) * | 2021-11-29 | 2022-03-01 | 厦门市思芯微科技有限公司 | Serial port expansion system based on multi-path grouping scheduling algorithm |
-
2017
- 2017-12-20 CN CN201721796383.3U patent/CN207601787U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114116566A (en) * | 2021-11-29 | 2022-03-01 | 厦门市思芯微科技有限公司 | Serial port expansion system based on multi-path grouping scheduling algorithm |
| CN114116566B (en) * | 2021-11-29 | 2024-04-19 | 厦门市思芯微科技有限公司 | Serial port expansion system based on multipath packet scheduling algorithm |
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