CN102857209A - Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function - Google Patents
Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function Download PDFInfo
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- CN102857209A CN102857209A CN2012103749268A CN201210374926A CN102857209A CN 102857209 A CN102857209 A CN 102857209A CN 2012103749268 A CN2012103749268 A CN 2012103749268A CN 201210374926 A CN201210374926 A CN 201210374926A CN 102857209 A CN102857209 A CN 102857209A
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Abstract
The invention relates to a microprocessor I/O (input/output) interface conversion circuit with a bidirectional transmission function, belonging to the field of electronic lines and aiming at solving the problems that the conversion circuit is needed to be replaced to meet transmission demands when the input and output states of the I/O interface of a microprocessor are changed, and the used device cannot be shared. The first connecting terminal of the conversion circuit is simultaneously connected with one end of a first resistor and the fourth contact of a double-pole double-throw switch. The other end of the first resistor is simultaneously connected with the second contact of the double-pole double-throw switch, the anode of a diode and the input end of a photoelectric coupler. The second connecting terminal of the conversion circuit is connected with the first movable contact of the double-pole double-throw switch. The third connecting terminal of the conversion circuit is simultaneously connected with a ground wire, the anode of the diode, the reference end of the photoelectric coupler and a fourth connecting terminal. One end of a second resistor is connected with the voltage end of the photoelectric coupler. The other end of the second resistor is simultaneously connected with the output end of the photoelectric coupler, the first contact of the double-pole double-throw switch and the second movable contact of the double-pole double-throw switch. The microprocessor I/O interface conversion circuit with the bidirectional transmission function is used for the voltage and current conversion process of the I/O interface of the microprocessor.
Description
Technical field
The present invention relates to a kind of microprocessor I/O interface conversion circuit, belong to field of electronic circuitry.
Background technology
In modern electronic technology is used, generally all use microprocessor as the center control element.Because microprocessor I/O interface all is low-voltage, little electric current and glitch-free coffret, all need to be connected with sensing element or the execution unit of outside through certain change-over circuit.All be that high voltage, large electric current will be carried out noiseless processing by recycling photoelectrical coupler behind voltage conversion circuit, the current converter circuit respectively now, although can reach the low-voltage of microprocessor I/O interface, little electric current and glitch-free requirement, but these change-over circuits often translation function of input and output separate, when changing, the input and output state need to change change-over circuit to adapt to the transmission demand, have the shortcoming that used element can not share, cause certain wasting of resources.
Summary of the invention
The present invention separates for the external change-over circuit input and output of the I/O interface translation function that solves microprocessor in the prior art, when changing, the state that inputs or outputs to change change-over circuit to adapt to the transmission demand, have the problem that used components and parts can not share, thereby propose a kind of microprocessor I/O interface conversion circuit with transmitted in both directions function.
Have the microprocessor I/O interface conversion circuit of transmitted in both directions function, it comprises the first splicing ear, the second splicing ear, the 3rd splicing ear, the 4th splicing ear, the first resistance, the second resistance, diode, photoelectrical coupler and double-point double-throw switch;
Described double-point double-throw switch comprises the first armature contact, the second armature contact, the first contact, the second contact, the 3rd contact and the 4th contact, described the first armature contact, the first contact and the second contact are same circuit, and the second armature contact, the 3rd contact and the 4th contact are same circuit;
Described the first splicing ear links to each other with an end of the first resistance and the 4th contact of double-point double-throw switch simultaneously, and the other end of the first resistance links to each other with the second contact of double-point double-throw switch, the negative electrode of diode D2 and the input of photoelectrical coupler simultaneously;
Described the second splicing ear links to each other with the first armature contact of double-point double-throw switch;
Described the 3rd splicing ear links to each other with the 4th splicing ear with the anode of ground wire, diode, the input reference edge of photoelectrical coupler, the output reference edge of photoelectrical coupler simultaneously;
One end of described the second resistance links to each other with photoelectrical coupler voltage, and the other end of the second resistance links to each other with the output of photoelectrical coupler, the first contact of double-point double-throw switch and the second armature contact of double-point double-throw switch simultaneously;
Described the first splicing ear links to each other with the external component distinct interface respectively with the 3rd splicing ear;
Described the second splicing ear links to each other with microprocessor I/O distinct interface respectively with the 4th splicing ear.
Present embodiment operation principle: S is double-point double-throw switch, plays the input function of change-over circuit and the work of output function conversion.
When double-point double-throw switch S the first movable end K1 is communicated with the first contact S1 that simultaneously the second movable end K2 of double-point double-throw switch S is communicated with the 3rd contact S3; be input state; the first resistance R 1 and the second resistance R 2 can have the dividing potential drop effect together; diode D2 carries out the inverse overvoltage protection to photoelectrical coupler O, and photoelectrical coupler O plays anti-external disturbance effect.
When double-point double-throw switch S the first movable end K1 is communicated with the second contact S2 that simultaneously the second movable end K2 of double-point double-throw switch S is communicated with the 4th contact S4, be output state, photoelectrical coupler voltage is by the second contact S2 input optocoupler O of double-point double-throw switch S, and the 4th link S4 through double-point double-throw switch S exports external component to again.
Advantage of the present invention comprises: (1) same circuit has two kinds of optional functions: input and output;
(2) photoelectrical coupler can share, and saves device;
(3) because a circuit has two kinds of functions, can with two kinds of function match of microprocessor I/O interface, can avoid when two kinds of functional mappings of microprocessor I/O interface changing the external conversion circuit;
(4) use change over switch to carry out the function conversion, reliable, directly perceived.
Description of drawings
Fig. 1 is the specific embodiment of the invention one described schematic diagram with microprocessor I/O interface conversion circuit of transmitted in both directions function; Fig. 2 is the specific embodiment of the invention two described microprocessor I/O interface conversion circuit schematic diagrams with transmitted in both directions function.
Embodiment
Embodiment one, in conjunction with Fig. 1 this embodiment is described.Microprocessor I/O interface conversion circuit with transmitted in both directions function, it comprises the first splicing ear 1, the second splicing ear 2, the 3rd splicing ear 3, the 4th splicing ear 4, the first resistance R 1, the second resistance R 2, diode D2, photoelectrical coupler O and double-point double-throw switch S;
Described double-point double-throw switch S comprises the first armature contact K1, the second armature contact K2, the first contact S1, the second contact S2, the 3rd contact S3 and the 4th contact S4, described the first armature contact K1, the first contact S1 and the second contact S2 are same circuit, and the second armature contact K2, the 3rd contact S3 and the 4th contact S4 are same circuit;
Described the first splicing ear 1 links to each other with an end of the first resistance R 1 and the 4th contact S4 of double-point double-throw switch S simultaneously, and the other end while of the first resistance R 1 links to each other with the negative electrode of the second contact S2, the diode D2 of double-point double-throw switch S and the input of photoelectrical coupler O;
Described the second splicing ear 2 links to each other with the first armature contact K1 of double-point double-throw switch S;
Described the 3rd splicing ear 3 links to each other with the 4th splicing ear 4 with the anode of ground wire, diode D2, the input reference edge of photoelectrical coupler O, the output reference edge of photoelectrical coupler O simultaneously;
One end of described the second resistance R 2 links to each other with the photoelectrical coupler voltage U, and the other end of the second resistance R 2 links to each other with the output of photoelectrical coupler O, the first contact S1 of double-point double-throw switch S and the second armature contact K2 of double-point double-throw switch S simultaneously;
Described the first splicing ear 1 links to each other with the external component distinct interface respectively with the 3rd splicing ear 3;
Described the second splicing ear 2 links to each other with microprocessor I/O distinct interface respectively with the 4th splicing ear 4.
Present embodiment operation principle: S is double-point double-throw switch, plays the input function of change-over circuit and the work of output function conversion.
When double-point double-throw switch S the first armature contact K1 is communicated with the first contact S1 that simultaneously the second armature contact K2 of double-point double-throw switch S is communicated with the 3rd contact S3; be input state; the first resistance R 1 and the second resistance R 2 can have the dividing potential drop effect together; diode D2 carries out the inverse overvoltage protection to photoelectrical coupler O, and photoelectrical coupler O plays anti-external disturbance effect.
When double-point double-throw switch S the first armature contact K1 is communicated with the second contact S2 that simultaneously the second armature contact K2 of double-point double-throw switch S is communicated with the 4th contact S4, be output state, photoelectrical coupler voltage is by the second contact S2 input optocoupler O of double-point double-throw switch S, and the 4th link S4 through double-point double-throw switch S exports external component to again.
Embodiment two, in conjunction with Fig. 2 this embodiment is described, what this embodiment and embodiment one were different is that it also comprises input light-emitting diode D1 and output light emitting diode D3;
The anode of described input light-emitting diode D1 links to each other with the negative electrode of the first splicing ear 1 and output light emitting diode D3 simultaneously;
The negative electrode of described input light-emitting diode D1 links to each other with an end of the first resistance R 1;
The anode of described output light emitting diode D3 links to each other with the 4th contact S4 of double-point double-throw switch S.
Increase input light-emitting diode D1 and output light emitting diode D3 in this embodiment, it is luminous to input light-emitting diode D1 conducting when input state, the indication input state; Output light emitting diode D3 conducting is luminous when output state, the indication output state.Realized the function indication of input and output functions, the transmission state that the user can very clear change-over circuit.
Microprocessor I/O interface conversion circuit with transmitted in both directions function provided by the present invention is that a digital terminal for microprocessor designs, and can jointly process the situation of multi-microprocessor I/O interface with a plurality of such change-over circuits.
Claims (2)
1. the microprocessor I/O interface conversion circuit that has the transmitted in both directions function is characterized in that it comprises the first splicing ear (1), the second splicing ear (2), the 3rd splicing ear (3), the 4th splicing ear (4), the first resistance (R1), the second resistance (R2), diode (D2), photoelectrical coupler (O) and double-point double-throw switch (S);
Described double-point double-throw switch (S) comprises the first armature contact (K1), the second armature contact (K2), the first contact (S1), the second contact (S2), the 3rd contact (S3) and the 4th contact (S4), described the first armature contact (K1), the first contact (S1) and the second contact (S2) are same circuit, and the second armature contact (K2), the 3rd contact (S3) and the 4th contact (S4) are same circuit;
Described the first splicing ear (1) links to each other with an end of the first resistance (R1) and the 4th contact (S4) of double-point double-throw switch (S) simultaneously, and the other end of the first resistance (R1) links to each other with second contact (S2) of double-point double-throw switch (S), the negative electrode of diode (D2) and the input of photoelectrical coupler (O) simultaneously;
Described the second splicing ear (2) links to each other with first armature contact (K1) of double-point double-throw switch (S);
Described the 3rd splicing ear (3) links to each other with the 4th splicing ear (4) with the anode of ground wire, diode (D2), the input reference edge of photoelectrical coupler (O), the output reference edge of photoelectrical coupler (O) simultaneously;
One end of described the second resistance (R2) links to each other with photoelectrical coupler voltage (U), and the other end of the second resistance (R2) links to each other with the output of photoelectrical coupler (O), first contact (S1) of double-point double-throw switch (S) and second armature contact (K2) of double-point double-throw switch (S) simultaneously;
Described the first splicing ear (1) links to each other with the external component distinct interface respectively with the 3rd splicing ear (3);
Described the second splicing ear (2) links to each other with microprocessor I/O distinct interface respectively with the 4th splicing ear (4).
2. the microprocessor I/O interface conversion circuit with transmitted in both directions function according to claim 1 is characterized in that it also comprises input light-emitting diode (D1) and output light emitting diode (D3);
The anode of described input light-emitting diode (D1) links to each other with the negative electrode of the first splicing ear (1) with output light emitting diode (D3) simultaneously;
The negative electrode of described input light-emitting diode (D1) links to each other with an end of the first resistance (R1);
The anode of described output light emitting diode (D3) links to each other with the 4th contact (S4) of double-point double-throw switch (S).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374926.8A CN102857209B (en) | 2012-09-29 | 2012-09-29 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374926.8A CN102857209B (en) | 2012-09-29 | 2012-09-29 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
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| Publication Number | Publication Date |
|---|---|
| CN102857209A true CN102857209A (en) | 2013-01-02 |
| CN102857209B CN102857209B (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210374926.8A Expired - Fee Related CN102857209B (en) | 2012-09-29 | 2012-09-29 | Microprocessor I/O (input/output) interface conversion circuit with bidirectional transmission function |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201107613Y (en) * | 2007-10-12 | 2008-08-27 | 安徽蓝德集团股份有限公司 | LD intelligent electric operator based on Modbus on site bus |
| US20090121825A1 (en) * | 2004-11-10 | 2009-05-14 | Koninklijke Philips Electronics N.V. | Method Of An Device For Performing Bi-Directional Transmission Using A Single-Wire |
| CN202178745U (en) * | 2011-08-02 | 2012-03-28 | 赵恩海 | Isolated driving bidirectional analog switch circuit |
| CN102497197A (en) * | 2011-12-28 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Isolated bidirectional digital input output circuit |
-
2012
- 2012-09-29 CN CN201210374926.8A patent/CN102857209B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090121825A1 (en) * | 2004-11-10 | 2009-05-14 | Koninklijke Philips Electronics N.V. | Method Of An Device For Performing Bi-Directional Transmission Using A Single-Wire |
| CN201107613Y (en) * | 2007-10-12 | 2008-08-27 | 安徽蓝德集团股份有限公司 | LD intelligent electric operator based on Modbus on site bus |
| CN202178745U (en) * | 2011-08-02 | 2012-03-28 | 赵恩海 | Isolated driving bidirectional analog switch circuit |
| CN102497197A (en) * | 2011-12-28 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Isolated bidirectional digital input output circuit |
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| CN102857209B (en) | 2015-03-04 |
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