CN209250632U

CN209250632U - A kind of datel circuit

Info

Publication number: CN209250632U
Application number: CN201920242282.4U
Authority: CN
Inventors: 李昌帅
Original assignee: Shenzhen City And Ahmed Technology Co Ltd
Current assignee: Shenzhen City And Ahmed Technology Co Ltd
Priority date: 2019-02-26
Filing date: 2019-02-26
Publication date: 2019-08-13
Anticipated expiration: 2029-02-26

Abstract

The utility model relates to telecommunication circuit field, espespecially a kind of datel circuit carries out regulation using the level signal that IC chip U81 exports MCU chip U6 until level signal is compatible with the level of TTL interface；The efficiency of transmission of IC chip U81 is fast, highest efficiency of transmission up to 10Mbps, meanwhile, No. 7 pins, No. 8 pins of IC chip U81 are composed of balance driver and differential receiver, and the enhancing of anti-common mode interference ability, i.e., noise immunity is good；The maximum transmission distance standard value of IC chip U81 is 4000 feet, more farther than the transmission standard of RS232 interface actually up to 3000 meters, so bringing huge convenience to user.

Description

A kind of datel circuit

Technical field

The utility model relates to telecommunication circuit field, espespecially a kind of datel circuit.

Background technique

With the development of electronic technology, communication data gateway class product is more and more extensive, and level is also more and more.It is most of The communication interface that gateway product uses is RS232, due to RS232 interface local restricted, data communication is made to cause many deficiencies Place is as follows:

The signal level value of 1.RS232 interface is higher, the chip of interface circuit easy to damage, and not with the level of TTL interface It is compatible with therefore need to use level shifting circuit that could connect with TTL interface circuit.

2. transmission rate is lower.

3.RS232 interface constitutes the transmission form on total ground using a signal wire and a signal line of return, this total Ground transmission is easy to produce common mode interference, so noise immunity is weak.

4. transmission range is limited, maximum transmission distance standard value is 50 feet, actually also can be used only in 50 meters or so.

Summary of the invention

To solve the above problems, the utility model provides a kind of datel circuit, fast, the anti-interference energy with efficiency of transmission The feature that power is strong and conveying distance is remote, and exportable and TTL interface compatibility level solve TTL interface circuit because level is excessively high And the problem of damaging.

A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: datel circuit, includes model For the IC chip U81 of the MCU chip U6 of QCA9531, model SP485EEN, the B49 pin and IC chip of MCU chip U6 No. 1 pin of U81 connects, and the A57 pin of MCU chip U6 is connect with No. 4 pins of IC chip U81, the A59 of MCU chip U6 Number pin is connect with No. 2 pins of IC chip U81, No. 3 pins, and No. 7 pins of IC chip U81 are connect with port 485-B-, IC No. 6 pins of chip U81 are connect with port 485-A+.

It further, further include having 3rd resistor R3, the both ends of 3rd resistor R3 are drawn with No. 1 of MCU chip U81 respectively Foot, vdd terminal connection.

It further, further include having the 4th resistance R4, the 5th resistance R5, the A59 pin of MCU chip U6 passes through the 4th electricity Resistance R4 is connect with No. 2 pins of IC chip U81, and the A59 pin of MCU chip U6 is connected by No. 3 pins of the 5th resistance R5.

Further, further include having the 6th resistance R6, the A49 pin of the MCU chip U6 by the 6th resistance R6 with No. 1 pin of IC chip U81 connects.

Further, further include having first resistor R1, second resistance R2, the 7th resistance R7, one end of first resistor R1 with The other end of vdd terminal connection, first resistor R1 is grounded by the 7th resistance R7, second resistance R2, and No. 6 with IC chip U81 Pin connection, No. 7 pins of IC chip U81 are connect with one end of second resistance R2.

It further, further include having the 8th resistance R8, the A57 pin of MCU chip U6 passes through the 8th resistance R8 and IC core No. 4 pins of piece U81.

It further, further include having the first ESD pipe D6, the 2nd ESD pipe D7, the 3rd ESD pipe D8, the two of the first ESD pipe D6 End is connect with No. 7 pins of IC chip U81, No. 6 pins respectively, and one end of the first ESD pipe D6 is grounded by the 2nd ESD pipe D7, The both ends of 3rd ESD pipe D8 respectively with one end of the first ESD pipe D6, connect.

It further, further include having the 9th resistance R9, the tenth resistance R10, No. 7 pins of IC chip U81 pass through the 9th electricity Resistance R9 is connect with port 485-B-, and No. 6 pins of IC chip U81 are connect by the tenth resistance R10 with port 485-A+.

The utility model has the beneficial effects that:

1. carrying out regulation using the level signal that IC chip U81 exports MCU chip U6 until level signal and TTL interface Level it is compatible.

The efficiency of transmission of 2.IC chip U81 is fast, highest efficiency of transmission up to 10Mbps, meanwhile, No. 7 of IC chip U81 are drawn Foot, No. 8 pins are composed of balance driver and differential receiver, anti-common mode interference ability enhancing, i.e. noise immunity It is good.

The maximum transmission distance standard value of 3.IC chip U81 is 4000 feet, actually up to 3000 meters, is connect than RS232 The transmission standard of mouth is farther, so bringing huge convenience to user.

Detailed description of the invention

Fig. 1 is the circuit diagram of the utility model.

Specific embodiment

In order to be clearer and more clear technical problem to be solved in the utility model, technical solution and beneficial effect, with Under in conjunction with the accompanying drawings and embodiments, the present invention will be further described in detail.In the utility model MCU chip U6 also with type It number is connected in opposite directions for the DDR2 memory of W971GG6SB-25, certainly, this is only a kind of embodiment, it should be understood that this place The specific example of description only to explain the utility model, is not used to limit the utility model.

Refering to Figure 1, the utility model is about a kind of datel circuit, it include the MCU of model QCA9531 The B49 pin of the IC chip U81 of chip U6, model SP485EEN, MCU chip U6 and No. 1 pin of IC chip U81 connect It connects, the A57 pin of MCU chip U6 is connect with No. 4 pins of IC chip U81, the A59 pin and IC chip of MCU chip U6 No. 2 pins of U81, No. 3 pin connections, No. 7 pins of IC chip U81 are connect with port 485-B-, and No. 6 of IC chip U81 are drawn Foot is connect with port 485-A+.

The use principle of the utility model is as follows:

High level is exported by the A59 pin of MCU chip U6 or low level, IC chip U81 are controlled according to the level Data processed receive or send, so that the level of output and TTL interface compatibility, solves TTL interface circuit and damage because level is excessively high Bad problem.

It further, further include having 3rd resistor R3, the both ends of 3rd resistor R3 are drawn with No. 1 of MCU chip U81 respectively Foot, vdd terminal connection；Using the above scheme, 3rd resistor R3 is pull-up resistor, is primarily due to IC chip U81 asynchronous communication data Transmission be to be carried out in a manner of byte, before the transmission of each byte, first to pass through a low level start bit and realize Data exchange, and can prevent interference signal from generating negative jump in No. 1 pin of IC chip U80 makes MCU chip U6 enter work Make state.

It further, further include having the 4th resistance R4, the 5th resistance R5, the A59 pin of MCU chip U6 passes through the 4th electricity Resistance R4 is connect with No. 2 pins of IC chip U81, and the A59 pin of MCU chip U6 is connected by No. 3 pins of the 5th resistance R5； Using the above scheme, the 4th resistance R4 and the 5th resistance R5 is current-limiting resistance, and the A59 pin of MCU chip U6 is avoided to export Electric current it is excessive and burn out IC chip U81 No. 2 pins, No. 3 pins.

Further, further include having the 6th resistance R6, the A49 pin of the MCU chip U6 by the 6th resistance R6 with No. 1 pin of IC chip U81 connects；Using the above scheme, the level for preventing the A49 pin of MCU chip U6 from exporting is excessively high, makes It is damaged at No. 1 pin of IC chip U81.

Further, further include having first resistor R1, second resistance R2, the 7th resistance R7, one end of first resistor R1 with The other end of vdd terminal connection, first resistor R1 is grounded by the 7th resistance R7, second resistance R2, and No. 6 with IC chip U81 Pin connection, No. 7 pins of IC chip U81 are connect with one end of second resistance R2；Using the above scheme, first resistor R1 is upper Pull-up resistor, second resistance R2 are pull down resistor, and first resistor R1, second resistance R2, the 7th resistance R7 cooperation are for guaranteeing without even The IC chip U81 connect is in idle condition, and is provided network failure protection, is improved the reliability of IC chip U81 node and network.

It further, further include having the 8th resistance R8, the A57 pin of MCU chip U6 passes through the 8th resistance R8 and IC core No. 4 pins of piece U81；Using the above scheme, the 8th resistance R8 is used to place the level of the A57 pin output of MCU chip U6 It is excessively high, cause No. 4 pins of IC chip U81 to damage.

It further, further include having the first ESD pipe D6, the 2nd ESD pipe D7, the 3rd ESD pipe D8, the two of the first ESD pipe D6 End is connect with No. 7 pins of IC chip U81, No. 6 pins respectively, and one end of the first ESD pipe D6 is grounded by the 2nd ESD pipe D7, The both ends of 3rd ESD pipe D8 respectively with one end of the first ESD pipe D6, connect；Using the above scheme, the first ESD pipe D6, second ESD pipe D7, the 3rd ESD pipe D8 prevent high pressure and EMI for playing the role of one, and the 2nd ESD pipe D7 are placed on 6,7 It is attached among foot, guarantees to transmit between bipod with stable signal.

It further, further include having the 9th resistance R9, the tenth resistance R10, No. 7 pins of IC chip U81 pass through the 9th electricity Resistance R9 is connect with port 485-B-, and No. 6 pins of IC chip U81 are connect by the tenth resistance R10 with port 485-A+；Using upper The phenomenon that stating scheme, No. 7 pins for making IC chip U81 being stablized, the signal that No. 6 pins export, avoid the occurrence of distorted signals.

In the more excellent mode of this specific embodiment, vdd terminal connects 5V power supply.

In the more excellent mode of this specific embodiment, No. 7 pins of IC chip U81, No. 8 pin output both threads, to Production communication wire rod goes connection external equipment that must carry out multiple twin and shielding, to guarantee the quality of signal, thus will not be other Signal interference causes communication data to be blocked by transmission with radiation.

Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine It protects in range.

Claims

1. a kind of datel circuit, it is characterised in that: include MCU chip (U6), the model of model QCA9531 The IC chip (U81) of SP485EEN, the B49 pin of MCU chip (U6) are connect with No. 1 pin of IC chip (U81), MCU core The A57 pin of piece (U6) is connect with No. 4 pins of IC chip (U81), the A59 pin and IC chip of MCU chip (U6) (U81) No. 2 pins, No. 3 pin connections, No. 7 pins of IC chip (U81) are connect with port 485-B-, IC chip (U81) No. 6 pins are connect with port 485-A+.

2. a kind of datel circuit according to claim 1, it is characterised in that: it further include having 3rd resistor (R3), the The both ends of three resistance (R3) are connect with No. 1 pin, vdd terminal of MCU chip (U81) respectively.

3. a kind of datel circuit according to claim 1, it is characterised in that: further include having the 4th resistance (R4), The A59 pin of five resistance (R5), MCU chip (U6) is connect by the 4th resistance (R4) with No. 2 pins of IC chip (U81), The A59 pin of MCU chip (U6) is connected by No. 3 pins of the 5th resistance (R5).

4. a kind of datel circuit according to claim 1, it is characterised in that: further include having the 6th resistance (R6), institute The A49 pin for stating MCU chip (U6) is connect by the 6th resistance (R6) with No. 1 pin of IC chip (U81).

5. a kind of datel circuit according to claim 1, it is characterised in that: further include having first resistor (R1), Two resistance (R2), the 7th resistance (R7), one end of first resistor (R1) are connect with vdd terminal, and the other end of first resistor (R1) is logical The 7th resistance (R7), second resistance (R2) ground connection are crossed, and is connect with No. 6 pins of IC chip (U81), No. 7 of IC chip (U81) Pin is connect with the one end of second resistance (R2).

6. a kind of datel circuit according to claim 1, it is characterised in that: further include having the 8th resistance (R8), MCU The A57 pin of chip (U6) passes through No. 4 pins of the 8th resistance (R8) and IC chip (U81).

7. a kind of datel circuit according to claim 1, it is characterised in that: further include having the first ESD pipe (D6), the Two ESD manage (D7), the 3rd ESD pipe (D8), and the both ends of the first ESD pipe (D6) are drawn with No. 7 pins of IC chip (U81), No. 6 respectively Foot connection, the first ESD manage the one end of (D6) by the 2nd ESD pipe (D7) ground connection, and the 3rd ESD manages the both ends of (D8) respectively with first ESD pipe (D6) one end, connect.

8. a kind of datel circuit according to claim 1, it is characterised in that: further include having the 9th resistance (R9), No. 7 pins of ten resistance (R10), IC chip (U81) are connect by the 9th resistance (R9) with port 485-B-, IC chip (U81) No. 6 pins connect with port 485-A+ by the tenth resistance (R10).