CN102832899B - Intelligent terminal resistance device - Google Patents
Intelligent terminal resistance device Download PDFInfo
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- CN102832899B CN102832899B CN201110160473.4A CN201110160473A CN102832899B CN 102832899 B CN102832899 B CN 102832899B CN 201110160473 A CN201110160473 A CN 201110160473A CN 102832899 B CN102832899 B CN 102832899B
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Abstract
The invention discloses an intelligent terminal resistance device, which comprises an input end switch, an input end terminal resistor, an output end switch and an output end terminal resistor. When a plurality of the intelligent terminal resistance devices are connected together, an input end switch of the first intelligent terminal resistance device turns on, so that a terminal resistor of the input end can be connected, and if an output end switch does not turn on, then a terminal resistor of the output end is not connected; an input end switch of the last intelligent terminal resistance device does not turn on, then a terminal resistor of the input end is not connected, and if an output end switch turns on, a terminal resistor of the output end can be connected; and input end switches of the other intelligent terminal resistance devices cannot turn on, then the input end terminal resistors cannot be connected; and output end switches cannot turn on, then the output end terminal resistors cannot be connected.
Description
Technical field
The present invention relates to a kind of terminal resistance device, particularly a kind of intelligent terminal resistance device.
Background technology
RS485 is a kind of communication standard common in industrial environment; Controller local area network (controller area network, referred to as CAN or CAN-bus) is then a kind of communication standard common in vehicle.When using RS485 or controller local area network, in network, first electronic installation needs to load onto a terminal resistance to reduce signal disturbing, and in network, last electronic installation also needs to load onto a terminal resistance to reduce signal disturbing.
Please refer to Fig. 1, it is existing RS485 (or controller local area network) network connection side block diagram.One electronic installation 102 comprises a communication IC 104; This communication IC 104 comprises hot end 106 and a cold end 108, uses with other those electronic installation 102 communications.Those hot ends 106 link together; Those cold ends 108 link together.First this electronic installation 102 needs to load onto a terminal resistance 110 to reduce signal disturbing, and last this electronic installation 102 also needs to load onto a terminal resistance 110 to reduce signal disturbing.
The current existing practice is after user finds out first this electronic installation 102 and last this electronic installation 102, and user manually loads onto this terminal resistance 110 and this terminal resistance 110 manually loaded onto by last this electronic installation 102 in first this electronic installation 102 again; Inconvenience so very and easily makeing mistakes.
Summary of the invention
For improving the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of intelligent terminal resistance device.
For reaching above-mentioned purpose of the present invention, intelligent terminal resistance device of the present invention is applied to a driving voltage and an electronic installation, this electronic installation comprises a communication IC, this communication IC comprises a hot end and a cold end, this intelligent terminal resistance device comprises: an input end switch unit, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this input end switch unit is electrically connected to this cold end; One input terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this input end switch unit; One input drive circuit unit, be electrically connected to this second pin of this driving voltage and this input end switch unit, this input drive circuit unit comprises input first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this input end switch unit; One input short-circuit loop, this input drive circuit unit is arranged relatively; One output switch element, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this output switch element is electrically connected to this cold end; One output terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this output switch element; One output drive circuit unit, be electrically connected to this second pin of this driving voltage and this output switch element, this output drive circuit unit comprises output first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this output switch element; And an output short-circuit loop, this output drive circuit unit is arranged relatively.When two these intelligent terminal resistance device are electrically connected, this input end switch unit meeting conducting of first this intelligent terminal resistance device, therefore this hot end and this cold end can connect this input terminal resistance unit of first this intelligent terminal resistance device, this input short-circuit loop of second this intelligent terminal resistance device can by this second pin ground connection of this output switch element of first this intelligent terminal resistance device, close this output switch element of first this intelligent terminal resistance device by this, therefore this hot end and this cold end can not connect this output terminal resistance unit of first this intelligent terminal resistance device, this output short-circuit loop of first this intelligent terminal resistance device can by this second pin ground connection of this input end switch unit of second this intelligent terminal resistance device, close this input end switch unit of second this intelligent terminal resistance device by this, therefore this hot end and this cold end can not connect this input terminal resistance unit of second this intelligent terminal resistance device, this output switch element meeting conducting of second this intelligent terminal resistance device, therefore this hot end and this cold end can connect this output terminal resistance unit of second this intelligent terminal resistance device.
For reaching above-mentioned purpose of the present invention, intelligent terminal resistance device of the present invention is applied to a driving voltage and an electronic installation, this electronic installation comprises a communication IC, this communication IC comprises a hot end and a cold end, this intelligent terminal resistance device comprises: an input end switch unit, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this input end switch unit is electrically connected to this cold end; One input terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this input end switch unit; One input drive circuit unit, be electrically connected to this second pin of this driving voltage and this input end switch unit, this input drive circuit unit comprises input first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this input end switch unit; One input first pin, is electrically connected to this hot end; One input second pin, is electrically connected to this cold end; One input the 3rd pin, this input second pin is arranged relatively; One input the 4th pin, is electrically connected to this input the 3rd pin; One input the 5th pin, is electrically connected to this second pin of this input end switch unit; One input the 6th pin, is electrically connected to ground; One output switch element, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this output switch element is electrically connected to this cold end; One output terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this output switch element; One output drive circuit unit, be electrically connected to this second pin of this driving voltage and this output switch element, this output drive circuit unit comprises output first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this output switch element; One output first pin, is electrically connected to this hot end; One output second pin, is electrically connected to this cold end; One output the 3rd pin, is electrically connected to this second pin of this output switch element; One output the 4th pin, is electrically connected to ground; One output the 5th pin, this output the 4th pin is arranged relatively; And output the 6th pin, be electrically connected to this output the 5th pin.
Effect of the present invention is to make terminal resistance can by convenient and correct connection.Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is existing RS485 (or controller local area network) network connection side block diagram;
Fig. 2 is an embodiment block diagram of intelligent terminal resistance device of the present invention;
Fig. 3 is an embodiment application block diagram of intelligent terminal resistance device of the present invention;
Fig. 4 is the another embodiment block diagram of intelligent terminal resistance device of the present invention;
Fig. 5 is the another embodiment application block diagram of intelligent terminal resistance device of the present invention.
Fig. 6 is an embodiment circuit diagram of intelligent terminal resistance device of the present invention.
Wherein, Reference numeral
Electronic installation 102
Communication IC 104
Hot end 106
Cold end 108
Terminal resistance 110
Intelligent terminal resistance device 20
Driving voltage 30
Input first pin 202
Input second pin 204
Input the 3rd pin 206
Input the 4th pin 208
Input the 5th pin 210
Input the 6th pin 212
Input end switch unit 214
First pin 216
Second pin 218
3rd pin 220
Input terminal resistance unit 222
Input first resistance unit 224
Input second resistance unit 226
Output first pin 228
Output second pin 230
Output the 3rd pin 232
Output the 4th pin 234
Output the 5th pin 236
Output the 6th pin 238
Output switch element 240
First pin 242
Second pin 244
3rd pin 246
Output terminal resistance unit 248
Output first resistance unit 250
Output second resistance unit 252
Input short-circuit loop 254
Output short-circuit loop 256
Input drive circuit unit 258
Output drive circuit unit 260
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and operation principle are described in detail:
Please refer to Fig. 2, it is an embodiment block diagram of intelligent terminal resistance device of the present invention.Intelligent terminal resistance device 20 of the present invention is applied to a driving voltage 30 and an electronic installation (non-icon); This electronic installation comprises a communication IC (non-icon); This communication IC comprises hot end 106 and a cold end 108, uses with other electronic installation with RS485 or controller local area network's mode communication.
This intelligent terminal resistance device 20 comprises input end switch unit 214, input terminal resistance unit 222, input drive circuit unit 258, input short-circuit loop 254, output switch element 240, output terminal resistance unit 248, output drive circuit unit 260 and an output short-circuit loop 256.
This input end switch unit 214 comprises one first pin 216,1 second pin 218 and one the 3rd pin 220; This output switch element 240 comprises one first pin 242,1 second pin 244 and one the 3rd pin 246.
This input drive circuit unit 258 comprises input first resistance unit 224 and input second resistance unit 226; This output drive circuit unit 260 comprises output first resistance unit 250 and output second resistance unit 252.
3rd pin 220 of this input end switch unit 214 is electrically connected to this cold end 108; One end of this input terminal resistance unit 222 is electrically connected to this hot end 106; The other end of this input terminal resistance unit 222 is electrically connected to this first pin 216 of this input end switch unit 214.
This input drive circuit unit 258 is electrically connected to this second pin 218 of this driving voltage 30 and this input end switch unit 214; One end of this input first resistance unit 224 is electrically connected to this driving voltage 30; The other end of this input first resistance unit 224 is electrically connected to this second pin 218 of this input end switch unit 214; One end of this input second resistance unit 226 is electrically connected to this second pin 218 of this input end switch unit 214; The other end of this input second resistance unit 226 is electrically connected to ground; This input short-circuit loop 254 is that this input drive circuit unit 258 is arranged relatively.
3rd pin 246 of this output switch element 240 is electrically connected to this cold end 108; One end of this output terminal resistance unit 248 is electrically connected to this hot end 106; The other end of this output terminal resistance unit 248 is electrically connected to this first pin 242 of this output switch element 240.
This output drive circuit unit 260 is electrically connected to this second pin 244 of this driving voltage 30 and this output switch element 240; One end of this output first resistance unit 250 is electrically connected to this driving voltage 30; The other end of this output first resistance unit 250 is electrically connected to this second pin 244 of this output switch element 240; One end of this output second resistance unit 252 is electrically connected to this second pin 244 of this output switch element 240; The other end of this output second resistance unit 252 is electrically connected to ground; This output short-circuit loop 256 this output drive circuit unit 260 relative is arranged.
This input end switch unit 214 can be a transistor switch or a field-effect transistor; This output switch element 240 can be a transistor switch or a field-effect transistor; This input terminal resistance unit 222, this output terminal resistance unit 248, this input first resistance unit 224, this output first resistance unit 250, this input second resistance unit 226 and this output second resistance unit 252 are resistance.
Please refer to Fig. 3, it is an embodiment application block diagram of intelligent terminal resistance device of the present invention.When two these intelligent terminal resistance device 20 are electrically connected:
This input end switch unit 214 meeting conducting of first this intelligent terminal resistance device 20, therefore this hot end 106 and this cold end 108 can connect this input terminal resistance unit 222 of first this intelligent terminal resistance device 20.
This input short-circuit loop 254 of second this intelligent terminal resistance device 20 can by this second pin 244 ground connection of this output switch element 240 of first this intelligent terminal resistance device 20, close this output switch element 240 of first this intelligent terminal resistance device 20 by this, therefore this hot end 106 and this cold end 108 can not connect this output terminal resistance unit 248 of first this intelligent terminal resistance device 20.
This output short-circuit loop 256 of first this intelligent terminal resistance device 20 can by this second pin 218 ground connection of this input end switch unit 214 of second this intelligent terminal resistance device 20, close this input end switch unit 214 of second this intelligent terminal resistance device 20 by this, therefore this hot end 106 and this cold end 108 can not connect this input terminal resistance unit 222 of second this intelligent terminal resistance device 20.
This output switch element 240 meeting conducting of second this intelligent terminal resistance device 20, therefore this hot end 106 and this cold end 108 can connect this output terminal resistance unit 248 of second this intelligent terminal resistance device 20.
Please refer to Fig. 4, it is the another embodiment block diagram of intelligent terminal resistance device of the present invention.Intelligent terminal resistance device 20 of the present invention is applied to a driving voltage 30 and an electronic installation (non-icon); This electronic installation comprises a communication IC (non-icon); This communication IC comprises hot end 106 and a cold end 108, uses with other electronic installation with RS485 or controller local area network's mode communication.
This intelligent terminal resistance device 20 comprises input end switch unit 214, input terminal resistance unit 222, input drive circuit unit 258, input first pin 202, input second pin 204, input the 3rd pin 206, input the 4th pin 208, input the 5th pin 210 and an input the 6th pin 212.
This intelligent terminal resistance device 20 also comprises output switch element 240, output terminal resistance unit 248, output drive circuit unit 260, output first pin 228, output second pin 230, output the 3rd pin 232, output the 4th pin 234, output the 5th pin 236 and an output the 6th pin 238.
This input end switch unit 214 comprises one first pin 216,1 second pin 218 and one the 3rd pin 220; This output switch element 240 comprises one first pin 242,1 second pin 244 and one the 3rd pin 246.
This input drive circuit unit 258 comprises input first resistance unit 224 and input second resistance unit 226; This output drive circuit unit 260 comprises output first resistance unit 250 and output second resistance unit 252.3rd pin 220 of this input end switch unit 214 is electrically connected to this cold end 108; One end of this input terminal resistance unit 222 is electrically connected to this hot end 106; The other end of this input terminal resistance unit 222 is electrically connected to this first pin 216 of this input end switch unit 214.
This input drive circuit unit 258 is electrically connected to this second pin 218 of this driving voltage 30 and this input end switch unit 214; One end of this input first resistance unit 224 is electrically connected to this driving voltage 30; The other end of this input first resistance unit 224 is electrically connected to this second pin 218 of this input end switch unit 214; One end of this input second resistance unit 226 is electrically connected to this second pin 218 of this input end switch unit 214; The other end of this input second resistance unit 226 is electrically connected to ground.
This input first pin 202 is electrically connected to this hot end 106; This input second pin 204 is electrically connected to this cold end 108; This input the 3rd pin 206 this input second pin 204 relative is arranged; This input the 4th pin 208 is electrically connected to this input the 3rd pin 206; This input the 5th pin 210 is electrically connected to this second pin 218 of this input end switch unit 214; This input the 6th pin 212 is electrically connected to ground.
3rd pin 246 of this output switch element 240 is electrically connected to this cold end 108; One end of this output terminal resistance unit 248 is electrically connected to this hot end 106; The other end of this output terminal resistance unit 248 is electrically connected to this first pin 242 of this output switch element 240.
This output drive circuit unit 260 is electrically connected to this second pin 244 of this driving voltage 30 and this output switch element 240; One end of this output first resistance unit 250 is electrically connected to this driving voltage 30; The other end of this output first resistance unit 250 is electrically connected to this second pin 244 of this output switch element 240; One end of this output second resistance unit 252 is electrically connected to this second pin 244 of this output switch element 240; The other end of this output second resistance unit 252 is electrically connected to ground.
This output first pin 228 is electrically connected to this hot end 106; This output second pin 230 is electrically connected to this cold end 108; This output the 3rd pin 232 is electrically connected to this second pin 244 of this output switch element 240; This output the 4th pin 234 is electrically connected to ground; Relative this output the 4th pin 234 of this output the 5th pin 236 is arranged; This output the 6th pin 238 is electrically connected to this output the 5th pin 236.
This input end switch unit 214 can be a transistor switch or a field-effect transistor; This output switch element 240 can be a transistor switch or a field-effect transistor; This input terminal resistance unit 222, this output terminal resistance unit 248, this input first resistance unit 224, this output first resistance unit 250, this input second resistance unit 226 and this output second resistance unit 252 are resistance.
Please refer to Fig. 5, it is the another embodiment application block diagram of intelligent terminal resistance device of the present invention; Suppose that three these electronic installations need to connect to link up.By a left side, this output first pin 228 to this output the 6th pin 238 of right first this intelligent terminal resistance device 20 is sequentially electrically connected to this input first pin 202 of right second this intelligent terminal resistance device 20 by a left side to this input the 6th pin 212; By a left side, this output first pin 228 to this output the 6th pin 238 of right second this intelligent terminal resistance device 20 is sequentially electrically connected to this input first pin 202 of right 3rd this intelligent terminal resistance device 20 by a left side to this input the 6th pin 212.
This input end switch unit 214 meeting conducting of right first this intelligent terminal resistance device 20 by a left side, so can connect this input terminal resistance unit 222 between this input first pin 202 and this input second pin 204; This output switch element 240 meeting not conducting because of this second pin 244 ground connection of this output switch element 240 of right first this intelligent terminal resistance device 20 by a left side, so can not connect this output terminal resistance unit 248 between this output first pin 228 and this output second pin 230.That is, first this electronic installation will have a terminal resistance.
This input end switch unit 214 meeting not conducting because of this second pin 218 ground connection of this input end switch unit 214 of right second this intelligent terminal resistance device 20 by a left side, so can not connect this input terminal resistance unit 222 between this input first pin 202 and this input second pin 204; This output switch element 240 meeting not conducting because of this second pin 244 ground connection of this output switch element 240 of right second this intelligent terminal resistance device 20 by a left side, so can not connect this output terminal resistance unit 248 between this output first pin 228 and this output second pin 230.That is, those middle electronic installations all will not have a terminal resistance.
This input end switch unit 214 meeting not conducting because of this second pin 218 ground connection of this input end switch unit 214 of right 3rd this intelligent terminal resistance device 20 by a left side, so can not connect this input terminal resistance unit 222 between this input first pin 202 and this input second pin 204; This output switch element 240 meeting conducting of right 3rd this intelligent terminal resistance device 20 by a left side, so can connect this output terminal resistance unit 248 between this output first pin 228 and this output second pin 230.That is, last this electronic installation will have a terminal resistance.
In a specific embodiment, this input first pin 202 to this input the 6th pin 212 can realize with a RJ45 female joint (RJ45 has eight pins, thus wherein two pins can); This output first pin 228 also can realize with a RJ45 female joint to this output the 6th pin 238; Therefore the electric connection of those intelligent terminal resistance device 20 can realize with RJ45 grid line.
Please refer to Fig. 6, it is an embodiment circuit diagram of intelligent terminal resistance device of the present invention.This embodiment is that use one RJ45 female joint realizes this input first pin 202 to this input the 6th pin 212 (first pin and the 6th pin of wherein RJ45 female joint do not use); This embodiment is that use one RJ45 female joint realizes this output first pin 228 to this output the 6th pin 238 (first pin and the 6th pin of wherein RJ45 female joint do not use).
The advantage of intelligent terminal resistance device of the present invention be to make multiple electronic installations connect after automatically connect a terminal resistance and last this electronic installation connects a terminal resistance at this electronic installation of First, and automatically do not connect a terminal resistance at all the other electronic installations, correctly to reduce signal disturbing; Do not need after user finds out first this electronic installation and last this electronic installation like prior art, user manually loads onto a terminal resistance and a terminal resistance manually loaded onto by last this electronic installation in first this electronic installation again.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (8)
1. an intelligent terminal resistance device, be applied to an electronic installation and receive a driving voltage, this electronic installation comprises a communication IC, and this communication IC comprises a hot end and a cold end, it is characterized in that, this intelligent terminal resistance device comprises:
One input end switch unit, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this input end switch unit is electrically connected to this cold end;
One input terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this input end switch unit;
One input drive circuit unit, be electrically connected to this second pin of this driving voltage and this input end switch unit, this input drive circuit unit comprises input first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this input end switch unit;
One input short-circuit loop, this input drive circuit unit is arranged relatively;
One output switch element, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this output switch element is electrically connected to this cold end;
One output terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this output switch element;
One output drive circuit unit, be electrically connected to this second pin of this driving voltage and this output switch element, this output drive circuit unit comprises output first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this output switch element; And
One output short-circuit loop, this output drive circuit unit is arranged relatively;
Wherein, when two these intelligent terminal resistance device are electrically connected, this input end switch unit meeting conducting of first this intelligent terminal resistance device, therefore this hot end and this cold end can connect this input terminal resistance unit of first this intelligent terminal resistance device, this input short-circuit loop of second this intelligent terminal resistance device can by this second pin ground connection of this output switch element of first this intelligent terminal resistance device, close this output switch element of first this intelligent terminal resistance device by this, therefore this hot end and this cold end can not connect this output terminal resistance unit of first this intelligent terminal resistance device, this output short-circuit loop of first this intelligent terminal resistance device can by this second pin ground connection of this input end switch unit of second this intelligent terminal resistance device, close this input end switch unit of second this intelligent terminal resistance device by this, therefore this hot end and this cold end can not connect this input terminal resistance unit of second this intelligent terminal resistance device, this output switch element meeting conducting of second this intelligent terminal resistance device, therefore this hot end and this cold end can connect this output terminal resistance unit of second this intelligent terminal resistance device.
2. intelligent terminal resistance device according to claim 1, is characterized in that, this input drive circuit unit also comprises input second resistance unit, and one end is electrically connected to this second pin of this input end switch unit, and the other end is electrically connected to ground.
3. intelligent terminal resistance device according to claim 2, is characterized in that, this output drive circuit unit also comprises output second resistance unit, and one end is electrically connected to this second pin of this output switch element, and the other end is electrically connected to ground.
4. intelligent terminal resistance device according to claim 3, is characterized in that, this input end switch unit is a transistor switch or a field-effect transistor, and this output switch element is a transistor switch or a field-effect transistor.
5. an intelligent terminal resistance device, be applied to an electronic installation and receive a driving voltage, this electronic installation comprises a communication IC, and this communication IC comprises a hot end and a cold end, it is characterized in that, this intelligent terminal resistance device comprises:
One input end switch unit, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this input end switch unit is electrically connected to this cold end;
One input terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this input end switch unit;
One input drive circuit unit, be electrically connected to this second pin of this driving voltage and this input end switch unit, this input drive circuit unit comprises input first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this input end switch unit;
One input first pin, is electrically connected to this hot end;
One input second pin, is electrically connected to this cold end;
One input the 3rd pin, this input second pin is arranged relatively;
One input the 4th pin, is electrically connected to this input the 3rd pin;
One input the 5th pin, is electrically connected to this second pin of this input end switch unit;
One input the 6th pin, is electrically connected to ground;
One output switch element, comprise one first pin, one second pin and one the 3rd pin, the 3rd pin of this output switch element is electrically connected to this cold end;
One output terminal resistance unit, one end is electrically connected to this hot end, and the other end is electrically connected to this first pin of this output switch element;
One output drive circuit unit, be electrically connected to this second pin of this driving voltage and this output switch element, this output drive circuit unit comprises output first resistance unit, one end is electrically connected to this driving voltage, and the other end is electrically connected to this second pin of this output switch element;
One output first pin, is electrically connected to this hot end;
One output second pin, is electrically connected to this cold end;
One output the 3rd pin, is electrically connected to this second pin of this output switch element;
One output the 4th pin, is electrically connected to ground;
One output the 5th pin, this output the 4th pin is arranged relatively; And
One output the 6th pin, is electrically connected to this output the 5th pin.
6. intelligent terminal resistance device according to claim 5, is characterized in that, this input drive circuit unit more comprises input second resistance unit, and one end is electrically connected to this second pin of this input end switch unit, and the other end is electrically connected to ground.
7. intelligent terminal resistance device according to claim 6, is characterized in that, this output drive circuit unit also comprises output second resistance unit, and one end is electrically connected to this second pin of this output switch element, and the other end is electrically connected to ground.
8. intelligent terminal resistance device according to claim 7, is characterized in that, this input end switch unit is a transistor switch or a field-effect transistor, and this output switch element is a transistor switch or a field-effect transistor.
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| CN201110160473.4A CN102832899B (en) | 2011-06-15 | 2011-06-15 | Intelligent terminal resistance device |
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|---|---|---|---|
| CN201110160473.4A CN102832899B (en) | 2011-06-15 | 2011-06-15 | Intelligent terminal resistance device |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989846A (en) * | 2009-08-03 | 2011-03-23 | 联咏科技股份有限公司 | Resistance regulation circuit for regulating terminal resistance value and relevant method |
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| JP5053579B2 (en) * | 2006-06-28 | 2012-10-17 | 寛治 大塚 | ESD protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989846A (en) * | 2009-08-03 | 2011-03-23 | 联咏科技股份有限公司 | Resistance regulation circuit for regulating terminal resistance value and relevant method |
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| Title |
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| On-chip terminating resistors for high speed ECL-CMOS interfaces;Gabara,T.J. 等;《ASIC Conference and Exhibit, 1992., Proceedings of Fifth Annual IEEE International 》;19920925;第292-295页 * |
| 李成 等.RS-485总线的高速串行远距离数据传输方法.《清华大学学报(自然科学版)》.2009,第49卷(第5期),第68-71页. * |
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