CN202956605U - Interface circuit applied to analog-to-digital converter and one-chip microcomputer - Google Patents
Interface circuit applied to analog-to-digital converter and one-chip microcomputer Download PDFInfo
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- CN202956605U CN202956605U CN 201220573348 CN201220573348U CN202956605U CN 202956605 U CN202956605 U CN 202956605U CN 201220573348 CN201220573348 CN 201220573348 CN 201220573348 U CN201220573348 U CN 201220573348U CN 202956605 U CN202956605 U CN 202956605U
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Abstract
The utility model discloses an interface circuit applied to an analog-to-digital converter and a one-chip microcomputer, mainly composed of the analog-to-digital converter and the one-chip microcomputer which are equipped with serial interfaces. The analog-to-digital converter is connected to the one-chip microcomputer via the serial interfaces, and is equipped with a power supply; interfaces P1 and an interface INT1 are respectively defined in the one-chip microcomputer; and the one-chip microcomputer is connected with the serial interfaces of the analog-to-digital converter via the interfaces P1 and the interface INT1. The interface circuit applied to the analog-to-digital converter and the one-chip microcomputer is simple in structure; and the analog-to-digital converter and the one-chip microcomputer are connected via the serial interfaces, thereby realizing data transmission in remote distance, and having the advantages including high precision, simple peripheral circuit structure and low communication cost.
Description
Technical field
The utility model relates to the Single-chip Controlling field, specifically, is a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer.
Background technology
Single-chip microcomputer is a kind of integrated circuit (IC) chip, be to adopt very large scale integration technology that central processor CPU random access memory ram, read only memory ROM, multiple I/O mouth and the functions such as interrupt system, timer/timer with data-handling capacity are integrated on a silicon chip to the little and perfect microcomputer system formed, the application in industrial control field is comparatively extensive.Take existing temperature acquisition system as example, this system be temperature sensor foremost, sensor, the simulating signal collected, is exported to single-chip microcomputer after analog to digital converter (that is: A/D converter) is converted to digital quantity by analog quantity, and single-chip microcomputer is controlled collection and the transmission of data.In said process, A/D converter select the accuracy that directly has influence on data transmission, for existing A/D converter, adopt parallel interface to be connected with single-chip microcomputer more, but often there is the circuit structure complexity in its interface circuit, need the defects such as more outward element is connected, when long-distance transmissions, reliability is poor, and communications cost is also higher, therefore, the utility model arises at the historic moment.
The utility model content
The purpose of this utility model is to provide a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer, the analog to digital converter that employing is provided with serial line interface is connected with single-chip microcomputer, can support long Distance Transmission, there are the characteristics such as communications cost is low, degree of accuracy is high, peripheral circuit is simple in structure.
The utility model is achieved through the following technical solutions: a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer, mainly by the analog to digital converter that is provided with serial line interface and single-chip microcomputer, formed, described analog to digital converter is connected on single-chip microcomputer by serial line interface, be provided with power supply on described analog to digital converter, interface circuit than the available technology adopting parallel join, not only outward element is few, degree of accuracy is high, also can transmit at a distance, and price is material benefit also.
For better realizing the utility model, on described single-chip microcomputer, definition has P1 interface, INT1 interface respectively, and described single-chip microcomputer is connected with the serial line interface of analog to digital converter by P1 interface, INT1 interface, and circuit structure is simple.
In the utility model, described serial line interface comprises the Q0 that is defined on analog to digital converter～Q3 interface, DS1～DS4 interface, DU interface and EOC interface; Described P1 interface comprises P0～P7 interface, described Q0～Q3 interface, DS1～DS4 interface are connected with P0～P7 interface successively, described DU interface, EOC interface are connected on the INT1 interface, during application, can first DU interface, EOC interface be connected with the INT1 interface after connecting again.
The described power supply of being located on analog to digital converter is the voltage source module be attached thereto, the voltage of described voltage source module is 1V～5V, in the utility model, the voltage source module can adopt MC1403, be a kind of bandgap voltage reference that adopts the laser correction, there is the advantages such as pin-point accuracy, Low Drift Temperature.
The utility model compared with prior art, has the following advantages and beneficial effect:
(1) the utility model adopts the analog to digital converter with serial line interface to be connected with single-chip microcomputer, can carry out remote data transmission, has the advantages such as degree of accuracy is high, peripheral circuit is simple in structure, communications cost is low.
(2) the voltage source module that the utility model adopts is connected on analog to digital converter, has the advantages such as pin-point accuracy, Low Drift Temperature, also can enlarge the voltage range of analog to digital converter, improves input impedance, further strengthens the degree of accuracy of communication.
(3) the utility model is simple in structure, and outward element is less, and the reference voltage of the analog to digital converter of employing is 1V～5V, also has the characteristics of low-power consumption.
The accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment:
The utility model proposes a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer, in the prior art, analog to digital converter adopts parallel interface to be connected with being connected of single-chip microcomputer more, the circuit structure complexity, communications cost is high, when carrying out Long-range Data Transmission, its reliability is also poor, therefore, the utility model adopts the connection modulus of serial line interface to replace parallel interface to connect, its structure comprises analog to digital converter and the single-chip microcomputer that is provided with serial line interface, wherein, analog to digital converter is connected on single-chip microcomputer by serial line interface, be provided with power supply on analog to digital converter, interface circuit than the available technology adopting parallel join, not only outward element is few, degree of accuracy is high, also can transmit at a distance, price is also more economical.
Circuit structure of the present utility model is as follows:
(1) single-chip microcomputer: single-chip microcomputer can adopt AT89C2051, on AT89C2051, definition has various IO interface, comprise timer, Parallel I/O interface, serial line interface etc., as: respectively the definition with single-chip microcomputer on P1 interface and INT1 interface, as shown in Figure 1, single-chip microcomputer is connected with the serial line interface of analog to digital converter by P1 interface, INT1 interface, and wherein, the P1 interface comprises P0～P7 interface.
(2) analog to digital converter: analog to digital converter can adopt MC14433, this chip can meet the demand of system, also there is the advantages such as hardware circuit design is simple, price is economical, in the utility model, the serial line interface that is defined in this chip comprises Q0～Q3 interface, DS1～DS4 interface, DU interface and EOC interface; As shown in Figure 1, MC14433 is connected with the P0 of single-chip microcomputer～P7 interface successively by Q0～Q3 interface, DS1～DS4 interface, DU interface, EOC interface are connected on the INT1 interface, during application, the DU interface is connected with the EOC interface, its role is to: for selecting continuous conversion regime, each transformation result is all delivered on the output register of single-chip microcomputer.The transformation result that single chip computer AT 89C2051 reads MC14433 can adopt interrupt mode (that is: the EOC interface is connected with external interrupt input end INT1 interface) or inquiry mode (that is: the arbitrary I/O mouth of EOC termination or expansion I/O mouth).
(3) power supply: in the utility model, power supply is that the power supply of being located on analog to digital converter is the voltage source module be attached thereto, and its a kind of bandgap voltage reference that adopts the laser correction, have the advantages such as pin-point accuracy, Low Drift Temperature.Can adopt MC1403, its voltage is 2.5V.As shown in Figure 1, it is upper that the voltage source module is connected to single chip computer AT 89C2051, and use potentiometer RP to carry out dividing potential drop, and after dividing potential drop, the full scale input voltage of voltage source module is 2V.
The utility model is simple in structure, between analog to digital converter and single-chip microcomputer, by serial line interface, is connected, and can realize remote data transmission, has the advantages such as degree of accuracy is high, peripheral circuit is simple in structure, communications cost is low.
The above; it is only preferred embodiment of the present utility model; not the utility model is done to any pro forma restriction, any simple modification, equivalent variations that every foundation technical spirit of the present utility model is done above embodiment, within all falling into protection domain of the present utility model.
Claims (4)
1. an interface circuit that is applied to analog to digital converter and single-chip microcomputer, it is characterized in that: mainly by the analog to digital converter that is provided with serial line interface and single-chip microcomputer, formed, described analog to digital converter is connected on single-chip microcomputer by serial line interface, on described analog to digital converter, is provided with power supply.
2. a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer according to claim 1, it is characterized in that: on described single-chip microcomputer, definition has P1 interface, INT1 interface respectively, and described single-chip microcomputer is connected with the serial line interface of analog to digital converter by P1 interface, INT1 interface.
3. a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer according to claim 2 is characterized in that: described serial line interface comprises the Q0 that is defined on analog to digital converter～Q3 interface, DS1～DS4 interface, DU interface and EOC interface; Described P1 interface comprises P0～P7 interface, and described Q0～Q3 interface, DS1～DS4 interface are connected with P0～P7 interface successively, and described DU interface, EOC interface are connected on the INT1 interface.
4. a kind of interface circuit that is applied to analog to digital converter and single-chip microcomputer according to claim 3, it is characterized in that: the described power supply of being located on analog to digital converter is the voltage source module be attached thereto, and the voltage of described voltage source module is 1V～5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220573348 CN202956605U (en) | 2012-11-02 | 2012-11-02 | Interface circuit applied to analog-to-digital converter and one-chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220573348 CN202956605U (en) | 2012-11-02 | 2012-11-02 | Interface circuit applied to analog-to-digital converter and one-chip microcomputer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202956605U true CN202956605U (en) | 2013-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220573348 Expired - Fee Related CN202956605U (en) | 2012-11-02 | 2012-11-02 | Interface circuit applied to analog-to-digital converter and one-chip microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202956605U (en) |
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2012
- 2012-11-02 CN CN 201220573348 patent/CN202956605U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20131102 |