CN202931279U - Circuit capable of realizing I2C hot plug and I2C device - Google Patents
Circuit capable of realizing I2C hot plug and I2C device Download PDFInfo
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- CN202931279U CN202931279U CN 201220609591 CN201220609591U CN202931279U CN 202931279 U CN202931279 U CN 202931279U CN 201220609591 CN201220609591 CN 201220609591 CN 201220609591 U CN201220609591 U CN 201220609591U CN 202931279 U CN202931279 U CN 202931279U
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Abstract
The utility model discloses a circuit capable of realizing the I2C hot plug and an I2C device. The circuit capable of realizing the I2C hot plug is connected with a signal transmitting unit and a signal receiving unit of the I2C device. The circuit capable of realizing the I2C hot plug includes a detection circuit, a switch circuit, and a power supply terminal which provides the working voltage. The detection circuit is connected with the switch circuit. The power supply terminal is connected with the detection circuit and the switch circuit respectively. When the detection circuit detects that the signal transmitting unit is connected with the I2C device, the detection circuit turns on the switch circuit, so the signal transmitting unit and the signal receiving unit are controlled to carry out I2C communication. The circuit realizes the hot plug of the I2C device, so the I2C device can directly carry out the plug operation under the condition that the system and the power supply are not turned off, and the operation is convenient. At the same time, the fault, damage, and data loss of the I2C device are prevented, and the system performance of the I2C device is improved.
Description
Technical field
The utility model relates to the devices communicating technical field, relates in particular to a kind of circuit and I2C equipment of the I2C of realization hot plug.
Background technology
Hot plug refers to warm swap, and warm connection function allows the user in shutdown system not exactly, carries out plug equipment in the situation of not cutting off the electricity supply.
I2C(Inter-Integrated Circuit) agreement itself is not support hot plug, if in shutdown system not, directly I2C equipment is plugged operation in the situation of not cutting off the electricity supply, can have a strong impact on the systematic function of I2C equipment, bring potential safety hazard, for example I2C equipment frequently breaks down or is damaged, causes the loss of data of I2C device interior storage etc., greatly reduce the systematic function of I2C equipment, cause and use inconvenience.
Summary of the invention
Main purpose of the present utility model is circuit and the I2C equipment that proposes a kind of I2C of realization hot plug, is intended to realize the hot plug of I2C equipment, improves the systematic function of I2C equipment.
In order to achieve the above object, the utility model proposes a kind of circuit of the I2C of realization hot plug, be connected with signal receiving unit with the signal transmitting unit of I2C equipment, this realizes the feeder ear that the circuit of I2C hot plug comprises testing circuit, switching circuit and is used for providing operating voltage; Described testing circuit is connected with described switching circuit, described feeder ear respectively with described testing circuit be connected switching circuit and be connected; Described testing circuit detects described signal transmitting unit I2C device when access, controls described switching circuit conducting, carries out I2C and communicates by letter to control described signal transmitting unit and described signal receiving unit.
Preferably, described testing circuit comprises the first resistance; One end of described the first resistance is connected with described feeder ear, and the other end of described the first resistance is connected with the input of described switching circuit, and is connected with the test side of described signal receiving unit.
Preferably, described testing circuit comprises the first resistance and the second resistance; One end of described the first resistance is connected with described feeder ear, the other end of described the first resistance is connected with the test side of described signal receiving unit, and respectively with the input of described switching circuit be connected an end of the second resistance and be connected, the other end ground connection of described the second resistance.
Preferably, described testing circuit also comprises an electric capacity; One end of described electric capacity is connected with the other end of described the first resistance, the other end ground connection of described electric capacity.
Preferably, described switching circuit comprises the first triode, the second triode and the 3rd triode, and described the first triode, the second triode and the 3rd triode are NPN type triode; Wherein:
The base stage of described the first triode is as the input of described switching circuit, be connected with the other end of described the first resistance, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the base stage of described the second triode, and is connected with the base stage of described the 3rd triode; The emitter of described the second triode is connected with the clock control end of described signal receiving unit, and the collector electrode of described the second triode is connected with the clock control end of described signal transmitting unit; The emitter of described the 3rd triode is connected with the Data Control end of described signal receiving unit, and the collector electrode of described the 3rd triode is connected with the Data Control end of signal transmitting unit; The base stage of described the second triode be connected the base stage of the 3rd triode and all be connected with described feeder ear.
Preferably, described switching circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance, the first bidirectional diode and the second bidirectional diode; Wherein:
The base stage of described the second triode be connected the base stage of the 3rd triode and all be connected with described feeder ear through described the 3rd resistance, the collector electrode of described the second triode is connected with the clock control end of described signal transmitting unit through described the 4th resistance, and the collector electrode of described the 3rd triode is connected with the Data Control end of described signal transmitting unit through the 5th resistance; One end of described the first bidirectional diode is connected with the Data Control end of described signal transmitting unit, other end ground connection; One end of described the second bidirectional diode is connected with the Data Control end of described signal transmitting unit, other end ground connection.
The utility model also proposes a kind of I2C equipment, this I2C equipment comprise signal transmitting unit, signal receiving unit and be connected in described signal transmitting unit and described signal receiving unit between the I2C bus, this I2C equipment also comprises the circuit of realizing the I2C hot plug, this circuit of realizing the I2C hot plug respectively with described signal transmitting unit be connected signal receiving unit and be connected, this realizes the feeder ear that the circuit of I2C hot plug comprises testing circuit, switching circuit and is used for providing operating voltage; Described testing circuit is connected with described switching circuit, described feeder ear respectively with described testing circuit be connected switching circuit and be connected; Described testing circuit detects described signal transmitting unit I2C device when access, controls described switching circuit conducting, carries out I2C and communicates by letter to control described signal transmitting unit and described signal receiving unit.
The circuit of realizing the I2C hot plug that the utility model proposes detects by the level state of testing circuit to the test side of signal receiving unit, if the test side of signal receiving unit being detected is high level, judge that signal transmitting unit has the access of I2C device, and the control switch circuit turn-on, and then the control signal transmitting element carries out I2C with signal receiving unit and communicates by letter; If the test side of signal receiving unit being detected is low level, judge that signal transmitting unit does not have the access of I2C device, the not conducting of control switch circuit, signal transmitting unit does not carry out I2C with signal receiving unit and communicates by letter.The utility model is realized the hot plug of I2C equipment, makes I2C equipment in the situation that non-shutdown system, power cutoff can directly not plug operation, and is easy to use; Simultaneously, reduce the phenomenons such as I2C equipment breaks down, damaged and loss of data, improved the systematic function of I2C equipment.
Description of drawings
Fig. 1 is the circuit diagram of circuit when accessing without the I2C device that the utility model is realized the I2C hot plug;
Fig. 2 is the circuit diagram of circuit when the access of I2C device is arranged that the utility model is realized the I2C hot plug.
The realization of the purpose of this utility model, functional characteristics and advantage in connection with embodiment, and is described further with reference to accompanying drawing.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
See figures.1.and.2, Fig. 1 is the circuit diagram of circuit when accessing without the I2C device that the utility model is realized the I2C hot plug; Fig. 2 is the circuit diagram of circuit when the access of I2C device is arranged that the utility model is realized the I2C hot plug.
The circuit of realizing the I2C hot plug that the utility model proposes, be connected with the signal receiving unit (not shown) with the signal transmitting unit (not shown) of I2C equipment, this realizes the feeder ear VCC that the circuit of I2C hot plug comprises testing circuit 100, switching circuit 200 and is used for providing operating voltage, in the present embodiment, the operating voltage that feeder ear VCC provides is 3.3V; Testing circuit 100 is connected with switching circuit 200, and feeder ear VCC is connected with switching circuit with testing circuit 100 respectively and is connected, for testing circuit 100 and switching circuit 200 provide operating voltage; Testing circuit 100 detects signal transmitting unit I2C device when access, and 200 conductings of control switch circuit, carries out I2C with control signal transmitting element and signal receiving unit and communicates by letter.
In the present embodiment, the level state of the test side by 100 pairs of signal receiving units of testing circuit detects, when the level state of the test side that signal receiving unit detected is high level, the judgement signal transmitting unit does not have the access of I2C device, the 200 not conductings of control switch circuit, be that switching circuit 200 does not obtain enough driving voltages and not conducting, thereby signal transmitting unit does not carry out I2C with signal receiving unit communicate by letter; When the level state of the test side that signal receiving unit detected is low level, the judgement signal transmitting unit has the access of I2C device, 200 conductings of control switch circuit, be that switching circuit 200 obtains enough driving voltages and conducting, signal transmitting unit carries out I2C with signal receiving unit by the I2C bus and communicates by letter.
In above-described embodiment, when the I2C device did not access, as shown in Figure 1, testing circuit 100 comprised the first resistance R 1; One end of the first resistance R 1 is connected with feeder ear VCC, and the other end of the first resistance R 1 is connected with the input of switching circuit 200, and the other end of the first resistance R 1 is connected with the test side of signal receiving unit.In Fig. 1, network label DETECT represents that the other end of the first resistance R 1 is connected to the test side of signal receiving unit, and the level state of the test side of 100 pairs of signal receiving units of testing circuit detects.
Particularly, when the access of I2C device is arranged, as shown in Figure 2, testing circuit 100 comprises the first resistance R 1 and the second resistance R 2, in the present embodiment, the resistance of the first resistance R 1 is 1K Ω, and the resistance of the second resistance R 2 is 22K Ω, can also select according to specific needs the resistance of other resistances to substitute, to reach better effect; One end of the first resistance R 1 is connected with feeder ear VCC, the other end of the first resistance R 1 is connected with the test side of signal receiving unit, and the other end of the first resistance R 1 respectively with the input of switching circuit 200 be connected an end of resistance R 2 and be connected, the other end ground connection of the second resistance R 2.In Fig. 2, network label DETECT represents that the other end of the first resistance R 1 is connected to the test side of signal receiving unit, and the level state of the test side of 100 pairs of signal receiving units of testing circuit detects.
Particularly, testing circuit 100 also comprises capacitor C 1; One end of capacitor C 1 is connected with the other end of the first resistance R 1, the other end ground connection of capacitor C 1.Capacitor C 1 is as the filter capacitor of testing circuit 100, and the interference of filtering high-frequency signal avoids testing circuit 100 the misoperation phenomenon to occur.
In above-described embodiment, switching circuit 200 comprises the first triode Q1, the second triode Q2 and the 3rd triode Q3, and in the present embodiment, the first triode Q1, the second triode Q2 and the 3rd triode Q3 are NPN type triode.
Wherein, the base stage of the first triode Q1 is as the input of switching circuit 200, be connected with the other end of the first resistance R 1, the grounded emitter of the first triode Q1, the collector electrode of the first triode Q1 is connected with the base stage of the second triode Q2, and the collector electrode of the first triode Q1 is connected with the base stage of the 3rd triode Q3; The emitter of the second triode Q2 is connected with the clock control end of signal receiving unit, and the collector electrode of the second triode Q2 is connected with the clock control end of signal transmitting unit; The emitter of the 3rd triode Q3 is connected with the Data Control end of signal receiving unit, and the collector electrode of the 3rd triode Q3 is connected with the Data Control end of signal transmitting unit; The base stage of the base stage of the second triode Q2 and the 3rd triode Q3 all is connected with feeder ear VCC.
In Fig. 1 and Fig. 2, the network label is that SCL_R represents that the emitter of the second triode Q2 is connected with the clock control end of signal receiving unit, the network label is that SCL_T represents that the collector electrode of the second triode Q2 is connected with the clock control end of signal transmitting unit, the network label is that SDA_R represents that the emitter of the 3rd triode Q3 is connected with the Data Control end of signal receiving unit, and the network label is that SDA_T represents that the collector electrode of the 3rd triode Q3 is connected with the Data Control end of signal transmitting unit; The present embodiment utilizes the on-off action of the first triode Q1, the second triode Q2 and the 3rd triode Q3, determines whether signal transmitting unit carries out I2C with signal receiving unit and communicate by letter.
Particularly, switching circuit 200 also comprises the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first bidirectional diode D1 and the second bidirectional diode D2, in the present embodiment, the resistance of the 3rd resistance R 3 is 10K Ω, the resistance of the 4th resistance R 4 is that the resistance of 100 Ω, the 5th resistance R 5 is 100 Ω, can also select according to specific needs the resistance of other resistances to substitute, to reach better effect.
Wherein, the base stage of the base stage of the second triode Q2 and the 3rd triode Q3 all is connected with feeder ear VCC through the 3rd resistance R 3, the collector electrode of the second triode Q2 is connected with the clock control end of signal transmitting unit through the 4th resistance R 4, and the collector electrode of the 3rd triode Q3 is connected with the Data Control end of signal transmitting unit through the 5th resistance R 5; The end of the first bidirectional diode D1 is connected with the Data Control end of signal transmitting unit, the other end ground connection of the first bidirectional diode D1; The end of the second bidirectional diode D2 is connected with the Data Control end of signal transmitting unit, the other end ground connection of the second bidirectional diode D2.In the present embodiment, the first bidirectional diode D1 and the second bidirectional diode D2 be as the electrostatic protection device of switching circuit 200, when avoiding the I2C equipment access because of the damage of the device in the static guiding number of writing receiving element.
The utility model realizes that the operation principle of the circuit of I2C hot plug is:
when signal receiving unit does not have the access of I2C device, when namely being equivalent to not be connected to the second resistance R 2 in testing circuit 100, as shown in Figure 1, due to the effect that the first resistance R 1 is arranged, move 3.3V on level with the test side of signal receiving unit, therefore the test side of signal receiving unit is high level, this moment, the base stage of the first triode Q1 was high level, the first triode Q1 obtains enough driving voltages and conducting, and the collector electrode output low level of the first triode Q1, the base stage that makes the second triode Q2 and the 3rd triode Q3 is low level, therefore the second triode Q2 and the 3rd triode Q3 do not have enough driving voltages and not conducting.Thereby the not conducting of I2C bus of signal transmitting unit and signal receiving unit, signal transmitting unit are not carried out I2C with signal receiving unit and are communicated by letter.
when signal receiving unit has the access of I2C device, when namely being equivalent to be connected to the second resistance R 2 in testing circuit 100, as shown in Figure 2, dividing potential drop effect due to the first resistance R 1 and the second resistance R 2, after dividing potential drop, the level of the test side of signal receiving unit is R2/ (R1+R2) * 3.3V=1K Ω/(22K Ω+1K Ω) * 3.3V=0.14V, make the test side of signal receiving unit become low level, this moment, the base stage of the first triode Q1 was low level, the first triode Q1 does not obtain enough driving voltages and not conducting, and due to have the 3rd resistance R 3 on draw effect, the base stage that makes the second triode Q2 and the 3rd triode Q3 is high level, therefore the second triode Q2 and the 3rd triode Q3 obtain enough driving voltages and conducting.Thereby the I2C bus conducting of signal transmitting unit and signal receiving unit and working, signal transmitting unit carries out I2C with signal receiving unit and communicates by letter.
In the present embodiment, when wanting to extract I2C equipment, first the second resistance R 2 is disconnected, the test side that testing circuit 100 detects signal receiving unit is high level, switching circuit 200 not conductings, at this moment just can extract I2C equipment, guarantee that I2C equipment is not damaged, the data of I2C device storage are not lost; When wanting to insert I2C equipment, with the second resistance R 2 detection circuit for access 100, the test side that testing circuit 100 detects signal receiving unit is low level, switching circuit 200 conductings, at this moment can insert I2C equipment, guarantee that I2C equipment can be not excessive and damaged because of electric current.
The circuit of realizing the I2C hot plug that the utility model proposes detects by the level state of the test side of 100 pairs of signal receiving units of testing circuit, if the test side of signal receiving unit being detected is high level, judge that signal transmitting unit has the access of I2C device, and 200 conductings of control switch circuit, and then the control signal transmitting element carries out I2C with signal receiving unit and communicates by letter; If the test side of signal receiving unit being detected is low level, judge that signal transmitting unit does not have the access of I2C device, the not conducting of control switch circuit, signal transmitting unit does not carry out I2C with signal receiving unit and communicates by letter.The utility model is realized the hot plug of I2C equipment, makes I2C equipment in the situation that non-shutdown system, power cutoff can directly not plug operation, and is easy to use; Simultaneously, reduce the phenomenons such as I2C equipment breaks down, damaged and loss of data, improved the systematic function of I2C equipment.
The utility model also proposes a kind of I2C equipment, this I2C equipment comprise signal transmitting unit, signal receiving unit and be connected in signal transmitting unit and signal receiving unit between the I2C bus, communicate by the I2C bus between signal transmitting unit and signal receiving unit.This I2C equipment also comprises the circuit of realizing the I2C hot plug, this circuit of realizing the I2C hot plug is connected with signal receiving unit with signal transmitting unit respectively, this circuit structure of circuit of realizing the I2C hot plug is identical with circuit structure and the operation principle of the circuit of the foregoing I2C of realization hot plug with operation principle, repeats no more herein.
The above is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.
Claims (7)
1. a circuit of realizing the I2C hot plug, be connected with signal receiving unit with the signal transmitting unit of I2C equipment, it is characterized in that, comprises testing circuit, switching circuit and be used for providing the feeder ear of operating voltage; Described testing circuit is connected with described switching circuit, described feeder ear respectively with described testing circuit be connected switching circuit and be connected; Described testing circuit detects described signal transmitting unit I2C device when access, controls described switching circuit conducting, carries out I2C and communicates by letter to control described signal transmitting unit and described signal receiving unit.
2. the circuit of realizing the I2C hot plug as claimed in claim 1, is characterized in that, described testing circuit comprises the first resistance; One end of described the first resistance is connected with described feeder ear, and the other end of described the first resistance is connected with the input of described switching circuit, and is connected with the test side of described signal receiving unit.
3. the circuit of realizing the I2C hot plug as claimed in claim 1, is characterized in that, described testing circuit comprises the first resistance and the second resistance; One end of described the first resistance is connected with described feeder ear, the other end of described the first resistance is connected with the test side of described signal receiving unit, and respectively with the input of described switching circuit be connected an end of the second resistance and be connected, the other end ground connection of described the second resistance.
4. realize as claimed in claim 2 or claim 3 the circuit of I2C hot plug, it is characterized in that, described testing circuit also comprises an electric capacity; One end of described electric capacity is connected with the other end of described the first resistance, the other end ground connection of described electric capacity.
5. the circuit of realizing hot plug as claimed in claim 1, is characterized in that, described switching circuit comprises the first triode, the second triode and the 3rd triode, and described the first triode, the second triode and the 3rd triode are NPN type triode; Wherein:
The base stage of described the first triode is as the input of described switching circuit, be connected with the other end of described the first resistance, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the base stage of described the second triode, and is connected with the base stage of described the 3rd triode; The emitter of described the second triode is connected with the clock control end of described signal receiving unit, and the collector electrode of described the second triode is connected with the clock control end of described signal transmitting unit; The emitter of described the 3rd triode is connected with the Data Control end of described signal receiving unit, and the collector electrode of described the 3rd triode is connected with the Data Control end of signal transmitting unit; The base stage of described the second triode be connected the base stage of the 3rd triode and all be connected with described feeder ear.
6. the circuit of realizing the I2C hot plug as claimed in claim 5, is characterized in that, described switching circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance, the first bidirectional diode and the second bidirectional diode; Wherein:
The base stage of described the second triode be connected the base stage of the 3rd triode and all be connected with described feeder ear through described the 3rd resistance, the collector electrode of described the second triode is connected with the clock control end of described signal transmitting unit through described the 4th resistance, and the collector electrode of described the 3rd triode is connected with the Data Control end of described signal transmitting unit through the 5th resistance; One end of described the first bidirectional diode is connected with the Data Control end of described signal transmitting unit, other end ground connection; One end of described the second bidirectional diode is connected with the Data Control end of described signal transmitting unit, other end ground connection.
7. I2C equipment, comprise signal transmitting unit, signal receiving unit and be connected in described signal transmitting unit and described signal receiving unit between the I2C bus, it is characterized in that, the circuit that also comprises the I2C of realization hot plug as described in any one in claim 1 to 6, the circuit of the described I2C of realization hot plug respectively with described signal transmitting unit be connected signal receiving unit and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609591 CN202931279U (en) | 2012-11-16 | 2012-11-16 | Circuit capable of realizing I2C hot plug and I2C device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609591 CN202931279U (en) | 2012-11-16 | 2012-11-16 | Circuit capable of realizing I2C hot plug and I2C device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202931279U true CN202931279U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220609591 Expired - Lifetime CN202931279U (en) | 2012-11-16 | 2012-11-16 | Circuit capable of realizing I2C hot plug and I2C device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202931279U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10848147B2 (en) | 2017-11-22 | 2020-11-24 | Stmicroelectronics International N.V. | High performance I2C transmitter and bus supply independent receiver, supporting large supply voltage variations |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
| CN115525099A (en) * | 2022-01-11 | 2022-12-27 | 荣耀终端有限公司 | Terminal equipment and method for detecting keyboard access |
-
2012
- 2012-11-16 CN CN 201220609591 patent/CN202931279U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10848147B2 (en) | 2017-11-22 | 2020-11-24 | Stmicroelectronics International N.V. | High performance I2C transmitter and bus supply independent receiver, supporting large supply voltage variations |
| CN115525099A (en) * | 2022-01-11 | 2022-12-27 | 荣耀终端有限公司 | Terminal equipment and method for detecting keyboard access |
| CN115525099B (en) * | 2022-01-11 | 2023-08-11 | 荣耀终端有限公司 | Terminal equipment and method for detecting keyboard access |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
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Granted publication date: 20130508 |