CN201499154U - 12C bus based bidirectional level switching circuit - Google Patents
12C bus based bidirectional level switching circuit Download PDFInfo
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- CN201499154U CN201499154U CN2009201925574U CN200920192557U CN201499154U CN 201499154 U CN201499154 U CN 201499154U CN 2009201925574 U CN2009201925574 U CN 2009201925574U CN 200920192557 U CN200920192557 U CN 200920192557U CN 201499154 U CN201499154 U CN 201499154U
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Abstract
The utility model discloses a 12C bus based bidirectional level switching circuit, comprising two N-shaped field-effect tubes and four pull-up resistors. Both the grid electrodes of the two N-shaped field-effect tubes are connected with a system uninterruptable power supply (VDD1). The source electrodes of the two N-shaped field-effect tubes are connected with the system uninterruptable power supply (VDD1) via a first pull-up resistor and a second pull-up resistor. The drain electrodes of the two N-shaped field-effect tubes are connected with a system uninterruptable power supply (VDD2) via a third pull-up resistor and a fourth pull-up resistor. A unidirectional guiding piece is serially connected among the system uninterruptable power supply (VDD2), the third pull-up resistor and the fourth pull-up resistor. The circuit is widely applied and can be applied to a system requiring for electrifying timing sequence.
Description
Technical field
The change-over circuit that the utility model relates to a kind of two varying levels when carrying out communication specifically is a kind of based on I
2The bidirectional level conversion circuit of C bus.
Background technology
Bidirectional level conversion circuit is a kind of being used for to carry out the circuit that communication is used between a plurality of IC with different operating voltage.The bidirectional level conversion circuit of prior art mostly is based on I
2The bidirectional level conversion circuit of C bus form, as shown in Figure 2, it comprises two N type field effect transistor and four pull-up resistors, the grid of described two N type field effect transistor all is connected with the system uninterrupted power supply, the source electrode of described two N type field effect transistor is connected with the system uninterrupted power supply by pull-up resistor respectively, and the drain electrode of described two N type field effect transistor is passed through a pull-up resistor respectively and is connected with system interruption power supply; Wherein VDD1 is system's uninterrupted power supply, and VDD2 is that system is interrupted power supply.Said structure based on I
2There is following defective in the bidirectional level conversion circuit of C bus in the use of reality: when foregoing circuit is applied in the system of electrifying timing sequence requirement, under the system standby state, the VDD2 outage, but, cause having on the VDD2 drain voltage owing to have a diode between the source electrode of N type field effect transistor and the drain electrode.When holding state returns to operating state, this drain voltage can cause VDD2 normally to power on, thereby makes the foregoing circuit cisco unity malfunction like this.Simultaneously, because above-mentioned based on I
2The bidirectional level conversion circuit of C bus can't be used in the system that has electrifying timing sequence to require, so its range of application is smaller.
The utility model content
The technical problems to be solved in the utility model is, overcomes the defective of above prior art, provide a kind of can in the system that the electrifying timing sequence requirement is arranged, use based on I
2The bidirectional level conversion circuit of C bus.
The technical solution of the utility model is to provide a kind of based on I
2The bidirectional level conversion circuit of C bus, comprise two N type field effect transistor and four pull-up resistors, the grid of described two N type field effect transistor all is connected with the system uninterrupted power supply, the source electrode of described two N type field effect transistor is connected with the system uninterrupted power supply by first pull-up resistor, second pull-up resistor respectively, the drain electrode of described two N type field effect transistor is interrupted power supply by the 3rd pull-up resistor, the 4th pull-up resistor with system respectively and is connected, the unidirectional conduction device of connecting between described system interruption power supply and the 3rd pull-up resistor, the 4th pull-up resistor.
After adopting above structure, the utility model compared with prior art has the following advantages:
The utility model is based on I
2The bidirectional level conversion circuit of the C bus unidirectional conduction device of between system is interrupted power supply and two pull-up resistors, connecting, the unidirectional conducting of this device can guarantee system when standby, there is not drain voltage in VDD2.When holding state recovers, because there is not drain voltage in VDD2, therefore can guarantee that VDD2 normally powers in system, whole system can operate as normal, makes the utility model based on I
2The bidirectional level conversion circuit of C bus can be used in the system that has electrifying timing sequence to require, and its range of application is wider.
Description of drawings
Fig. 1 is that the utility model is based on I
2The circuit theory diagrams of the bidirectional level conversion circuit of C bus.
Fig. 2 is that prior art is based on I
2The circuit theory diagrams of the bidirectional level conversion circuit of C bus.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, in the utility model, the uninterrupted power supply VDD1 of system of the 3.3V of employing and the system of 5V are interrupted power vd D2.The utility model is a kind of based on I
2The bidirectional level conversion circuit of C bus comprises N type field effect transistor TR1, N type field effect transistor TR2, and its model is NTJD4001N ONSMEI; Pull-up resistor RP1, pull-up resistor RP2, pull-up resistor RP3 and pull-up resistor RP4, the grid g of the grid g of described N type field effect transistor TR1 and N type field effect transistor TR2 all is connected with the uninterrupted power supply VDD1 of system; The source electrode s of the source electrode s of described N type field effect transistor TR1, N type field effect transistor TR2 is connected with the uninterrupted power supply VDD1 of system by pull-up resistor RP1, pull-up resistor RP2 respectively; The drain electrode d of the drain electrode d of described N type field effect transistor TR1 and N type field effect transistor TR2 is interrupted power vd D2 by pull-up resistor RP3, pull-up resistor RP4 and system respectively and is connected; Described system is interrupted the unidirectional conduction device of connecting between power vd D2 and pull-up resistor RP3, the pull-up resistor RP4.
Described unidirectional conduction device is diode D1, and the P utmost point of described diode D1 is interrupted power supply 5V with system and is connected, and its N utmost point is connected with pull-up resistor RP3, pull-up resistor RP4 respectively.
During use, two signal ends of 3.3V device are connected with the source electrode s of N type field effect transistor TR1, the source electrode s of N type field effect transistor TR2 respectively, two signal ends of 5.5V device are connected with the drain electrode d of N type field effect transistor TR1, the drain electrode d of N type field effect transistor TR2 respectively, can realize the communication of 3.3V device and 5.5V device, be useful in the system of some electrifying timing sequence requirements and use.
Unidirectional conduction device in the utility model can also be devices such as thyristor; This is also in protection range of the present utility model.
Claims (2)
1. one kind based on I
2The bidirectional level conversion circuit of C bus, comprise two N type field effect transistor and four pull-up resistors, the grid of described two N type field effect transistor all is connected with system uninterrupted power supply (VDD1), the source electrode of described two N type field effect transistor is respectively by first pull-up resistor, second pull-up resistor is connected with system uninterrupted power supply (VDD1), the drain electrode of described two N type field effect transistor is respectively by the 3rd pull-up resistor, the 4th pull-up resistor is interrupted power supply (VDD2) with system and is connected, and it is characterized in that: described system is interrupted power supply (VDD2) and the 3rd pull-up resistor, series connection one unidirectional conduction device between the 4th pull-up resistor.
2. according to claim 1 based on I
2The bidirectional level conversion circuit of C bus is characterized in that: described unidirectional conduction device is diode (D1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201925574U CN201499154U (en) | 2009-08-26 | 2009-08-26 | 12C bus based bidirectional level switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201925574U CN201499154U (en) | 2009-08-26 | 2009-08-26 | 12C bus based bidirectional level switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201499154U true CN201499154U (en) | 2010-06-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201925574U Expired - Fee Related CN201499154U (en) | 2009-08-26 | 2009-08-26 | 12C bus based bidirectional level switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201499154U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542792A (en) * | 2011-12-30 | 2012-07-04 | 中盟智能科技（苏州）有限公司 | Method and device for achieving vehicle inspection device sharing through level signal conversion |
| CN103716037A (en) * | 2013-12-17 | 2014-04-09 | 深圳市新国都技术股份有限公司 | Bidirectional electrical level conversion circuit |
| CN109828939A (en) * | 2018-12-28 | 2019-05-31 | 曙光信息产业(北京)有限公司 | The level shifting circuit of universal serial bus |
-
2009
- 2009-08-26 CN CN2009201925574U patent/CN201499154U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542792A (en) * | 2011-12-30 | 2012-07-04 | 中盟智能科技（苏州）有限公司 | Method and device for achieving vehicle inspection device sharing through level signal conversion |
| CN102542792B (en) * | 2011-12-30 | 2014-12-17 | 中盟智能科技（苏州）有限公司 | Method and device for achieving vehicle inspection device sharing through level signal conversion |
| CN103716037A (en) * | 2013-12-17 | 2014-04-09 | 深圳市新国都技术股份有限公司 | Bidirectional electrical level conversion circuit |
| CN109828939A (en) * | 2018-12-28 | 2019-05-31 | 曙光信息产业(北京)有限公司 | The level shifting circuit of universal serial bus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20180826 |