CN202043034U - Level shift circuit realizing shifting from 5v signal to 3.3v signal for singlechip system - Google Patents
Level shift circuit realizing shifting from 5v signal to 3.3v signal for singlechip system Download PDFInfo
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- CN202043034U CN202043034U CN201120160811XU CN201120160811U CN202043034U CN 202043034 U CN202043034 U CN 202043034U CN 201120160811X U CN201120160811X U CN 201120160811XU CN 201120160811 U CN201120160811 U CN 201120160811U CN 202043034 U CN202043034 U CN 202043034U
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Abstract
The utility model discloses a level shift circuit realizing shifting from a 5v signal to a 3.3v signal for a singlechip system. The level shift circuit is formed by connecting a resistor and a diode, wherein one end of the resistor is connected with a 3.3v level, the other end of the resistor is connected with the positive pole of the diode, the negative pole of the diode is connected with a 5v input signal interface, and the positive pole of the diode is connected with a 3.3v singlechip interface. In the utility model, the principle is simple, the shifting between a 5v level and the 3.3v level is realized by cheap electron components, the circuit is simple in structure, and the manufacturing cost is low.
Description
Technical field
The utility model relates to single-chip microcomputer, particularly a kind of circuit that makes single-chip microcomputer finish level conversion in 5V and 3.3V mixed voltage system.
Background technology
Along with the development of single-chip microcomputer technology, the processing speed of single-chip microcomputer is more and more faster, and size is more and more littler.But along with reducing of size, it is lower that transistorized puncture voltage becomes, and when puncture voltage is lower than supply voltage, just requires to reduce supply voltage.Therefore, the supply voltage that inevitable consequence is exactly a single-chip microcomputer is reduced to 3.3V from 5V, even 1.8V.But problem is the interface circuit of most devices in the market still is the design of 5V power supply, and this just means that the designer will face changing between connection 3.3V and 5V and both level of task.
The utility model content
The logic level mismatch problem that is produced when being the device interface of the single-chip microcomputer of 3.3V and 5V power supply at existing power supply voltage, the utility model provides a kind of Single Chip Microcomputer (SCM) system 5V signal to change the 3.3V signal level shift circuit, realizes that the 5V signal changes the purpose of 3.3V signal.
The technical solution of the utility model is as follows:
A kind of Single Chip Microcomputer (SCM) system 5V signal changes the 3.3V signal level shift circuit, connect to form by resistance, diode, one end of described resistance connects the 3.3V level, the other end is connected with the positive pole of described diode, the negative pole of described diode connects 5V input signal interface, and the positive pole of described diode connects the 3.3V interface microcontroller.
Useful technique effect of the present utility model is:
The utility model principle is simple, and by the electronic devices and components realization 5V of cheapness and the conversion of 3.3V level, circuit structure is simple, and is cheap for manufacturing cost.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the new test waveform figure of this practicality.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
As shown in Figure 1, the utility model is connected to form by resistance R 1 and diode D1.One end of resistance R 1 connects the 3.3V level, and the other end of resistance R 1 is connected with the positive pole of diode D1.The negative pole of diode D1 (A point) connects 5V input signal interface, and the positive pole of diode D1 (B point) connects the 3.3V interface microcontroller.
The utility model utilizes unidirectional conducting principle and the pull-up resistor R1 collocation of diode D1, when the A point is low level, and diode D1 conducting, the B point voltage is the tube voltage drop of D1.Utilize resistance R 1 limit value electric current, make that the electric current of diode D1 is very little, tube voltage drop is also much smaller than 0.7V, so the B point voltage can reach the low level claimed range of common IC.When the A point was high level (5V), diode D1 ended, and the B point voltage is then for drawing level 3.3V on the resistance R 1.
Test waveform of the present utility model is as shown in Figure 2: wherein the C1 waveform is 5V input signal (an A point), and the C2 waveform is 3.3V output signal (a B point).
The utility model utilizes common electronic devices and components to reach the purpose that the 5V signal changes the 3.3V signal.Resistance R 1 and diode D1 adopt the commercial goods in the present embodiment, and be high if conversion speed requires, and fast diode or Schottky diode reach requirement faster then can to select speed.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present utility model and design, all should think to be included within the protection range of the present utility model.
Claims (1)
1. a Single Chip Microcomputer (SCM) system 5V signal changes the 3.3V signal level shift circuit, it is characterized in that: connect to form by resistance, diode, one end of described resistance connects the 3.3V level, the other end is connected with the positive pole of described diode, the negative pole of described diode connects 5V input signal interface, and the positive pole of described diode connects the 3.3V interface microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120160811XU CN202043034U (en) | 2011-05-19 | 2011-05-19 | Level shift circuit realizing shifting from 5v signal to 3.3v signal for singlechip system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120160811XU CN202043034U (en) | 2011-05-19 | 2011-05-19 | Level shift circuit realizing shifting from 5v signal to 3.3v signal for singlechip system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202043034U true CN202043034U (en) | 2011-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120160811XU Expired - Fee Related CN202043034U (en) | 2011-05-19 | 2011-05-19 | Level shift circuit realizing shifting from 5v signal to 3.3v signal for singlechip system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202043034U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832923A (en) * | 2012-09-06 | 2012-12-19 | 中达电通股份有限公司 | Bidirectional transmission circuit |
| CN108306629A (en) * | 2018-02-27 | 2018-07-20 | 上海康斐信息技术有限公司 | A kind of synchronous reset device of difference reset level |
-
2011
- 2011-05-19 CN CN201120160811XU patent/CN202043034U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832923A (en) * | 2012-09-06 | 2012-12-19 | 中达电通股份有限公司 | Bidirectional transmission circuit |
| CN102832923B (en) * | 2012-09-06 | 2014-12-31 | 中达电通股份有限公司 | Bidirectional transmission circuit |
| CN108306629A (en) * | 2018-02-27 | 2018-07-20 | 上海康斐信息技术有限公司 | A kind of synchronous reset device of difference reset level |
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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 |
Granted publication date: 20111116 Termination date: 20170519 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |