CN210745112U - Bidirectional level conversion circuit - Google Patents
Bidirectional level conversion circuit Download PDFInfo
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- CN210745112U CN210745112U CN201922081021.1U CN201922081021U CN210745112U CN 210745112 U CN210745112 U CN 210745112U CN 201922081021 U CN201922081021 U CN 201922081021U CN 210745112 U CN210745112 U CN 210745112U
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Abstract
The utility model provides a two-way level conversion circuit, include: 3V end IO mouth and 5V end IO mouth still include: the anode of the diode D1 is connected with the 5V-end IO port, and the cathode of the diode D1 is connected with the 3V-end IO port; one end of the pull-down resistor R1 is connected between the 3V-end IO port and the negative electrode; and one end of the pull-up resistor R2 is connected between the 5V-end IO port and the anode. The utility model discloses carry out two-way level conversion with a diode and two pull-up and pull-down resistors. The conduction voltage drop of the diode is utilized to increase the voltage output by the 3V end to about 3.7V, and the requirement of high level input by the 5V end is met.
Description
Technical Field
The utility model relates to an electronic circuit field specifically relates to a two-way level conversion circuit.
Background
In the electronic products on the market, a 3V system and a 5V system often coexist, and the connection between the systems needs to use level conversion. Wherein, the connection of some interfaces is unidirectional, such as 3V system transmitting 5V system receiving, or 5V system transmitting 3V system receiving, and some interfaces are bidirectional.
For example, patent document CN 209526709U discloses a bidirectional level shift circuit and a bidirectional level shift chip, which include a signal transmission tube, a first pull-up tube, a second pull-up tube, and a pull-up control module; the first end of the first pull-up tube is electrically connected with the first voltage end, the second end of the first pull-up tube is electrically connected with the first end of the signal transmission tube, the first end of the second pull-up tube is electrically connected with the second voltage end, and the second end of the second pull-up tube is electrically connected with the second end of the signal transmission tube; the first signal input end of the pull-up control module is electrically connected with the first end of the signal transmission tube, the second signal input end of the pull-up control module is electrically connected with the second end of the signal transmission tube, and the output end of the pull-up control module is electrically connected with the grid electrodes of the first pull-up tube and the second pull-up tube, and the pull-up control module is used for outputting a first level pulse when any one of the first end and the second end of the signal transmission tube is inverted from a first level to a second level. The traditional bidirectional level conversion solution is to use a special level conversion chip or to use an MOS tube and a triode to build a complex conversion circuit. The system is complex, the cost is high, and the occupied area of the circuit board is large.
SUMMERY OF THE UTILITY MODEL
To the defects in the prior art, the present invention provides a bidirectional level conversion circuit.
According to the utility model provides a pair of two-way level conversion circuit, include: 3V end IO mouth and 5V end IO mouth still include:
the anode of the diode D1 is connected with the 5V-end IO port, and the cathode of the diode D1 is connected with the 3V-end IO port;
one end of the pull-down resistor R1 is connected between the 3V-end IO port and the negative electrode;
and one end of the pull-up resistor R2 is connected between the 5V-end IO port and the anode.
Preferably, the other end of the pull-up resistor R2 is connected to a +5V voltage.
Preferably, the other end of the pull-down resistor R1 is grounded.
Preferably, the pull-up resistor R2 has a resistance of 10K ohms.
Preferably, the pull-down resistor R1 has a resistance of 10K ohms.
Preferably, the threshold voltage of the diode D1 is 0.7V.
According to the utility model provides a pair of two-way level conversion circuit, include: 3V end IO mouth and 5V end IO mouth still include:
the anode of the diode D1 is connected with the 5V-end IO port, and the cathode of the diode D1 is connected with the 3V-end IO port;
one end of the pull-down resistor R1 is connected between the 3V-end IO port and the negative electrode;
a pull-up resistor R2, one end of which is connected between the 5V-end IO port and the anode;
the other end of the pull-up resistor R2 is connected with +5V voltage;
the other end of the pull-down resistor R1 is grounded;
the resistance value of the pull-up resistor R2 is 10K ohms;
the resistance value of the pull-down resistor R1 is 10K ohms;
the threshold voltage of the diode D1 is 0.7V.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses carry out two-way level conversion with a diode and two pull-up and pull-down resistors. The conduction voltage drop of the diode is utilized to increase the voltage output by the 3V end to about 3.7V, and the requirement of high level input by the 5V end is met.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
As shown in fig. 1, the present invention provides a bidirectional level shift circuit, including: 3V end IO mouth and 5V end IO mouth still include: diode D1, pull-down resistor R1, and pull-up resistor R2.
The anode of the diode D1 is connected with the 5V terminal IO port, and the cathode is connected with the 3V terminal IO port. One end of the pull-down resistor R1 is connected between the IO port at the 3V end and the negative electrode, and the other end of the pull-down resistor R1 is grounded. One end of a pull-up resistor R2 is connected between the 5V-end IO port and the positive electrode, and the other end of the pull-up resistor R2 is connected with +5V voltage.
In the present embodiment, the resistance of the pull-up resistor R2 is 10K ohms, the resistance of the pull-down resistor R1 is 10K ohms, and the threshold voltage of the diode D1 is 0.7V.
When the 3V end outputs 0V, the diode D1 is conducted, the 5V end receives 0.7V, and the <1.5V meets the requirement of 5V input low level.
When the 3V end outputs 3V, the diode D1 is conducted, the 5V end receives 3.7V, and the high level requirement of the 5V input is met by 3.5V.
When the 5V end outputs 0V, the diode D1 is cut off, and the 3V end receives 0V, so that the requirement of 3V input low level is met.
When 5V is output from the 5V end, the diode D1 is conducted, 4.3V is received by the 5V end, the requirement of 3V input high level is met, 4.3V is smaller than the voltage which can be tolerated by the 3V end IO, and the port cannot be damaged.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. A bi-directional level shift circuit, comprising: 3V end IO mouth and 5V end IO mouth still include:
the anode of the diode D1 is connected with the 5V-end IO port, and the cathode of the diode D1 is connected with the 3V-end IO port;
one end of the pull-down resistor R1 is connected between the 3V-end IO port and the negative electrode;
and one end of the pull-up resistor R2 is connected between the 5V-end IO port and the anode.
2. The bi-directional level shift circuit of claim 1, wherein the other end of pull-up resistor R2 is connected to a +5V voltage.
3. The bi-directional level shift circuit of claim 1, wherein the other end of the pull-down resistor R1 is connected to ground.
4. The bi-directional level shift circuit of claim 1, wherein the pull-up resistor R2 is 10K ohms.
5. The bi-directional level shift circuit of claim 1, wherein the pull-down resistor R1 has a resistance of 10K ohms.
6. The bi-directional level shift circuit of claim 1, wherein the diode D1 has a threshold voltage of 0.7V.
7. A bi-directional level shift circuit, comprising: 3V end IO mouth and 5V end IO mouth still include:
the anode of the diode D1 is connected with the 5V-end IO port, and the cathode of the diode D1 is connected with the 3V-end IO port;
one end of the pull-down resistor R1 is connected between the 3V-end IO port and the negative electrode;
a pull-up resistor R2, one end of which is connected between the 5V-end IO port and the anode;
the other end of the pull-up resistor R2 is connected with +5V voltage;
the other end of the pull-down resistor R1 is grounded;
the resistance value of the pull-up resistor R2 is 10K ohms;
the resistance value of the pull-down resistor R1 is 10K ohms;
the threshold voltage of the diode D1 is 0.7V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922081021.1U CN210745112U (en) | 2019-11-27 | 2019-11-27 | Bidirectional level conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922081021.1U CN210745112U (en) | 2019-11-27 | 2019-11-27 | Bidirectional level conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210745112U true CN210745112U (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922081021.1U Active CN210745112U (en) | 2019-11-27 | 2019-11-27 | Bidirectional level conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210745112U (en) |
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2019
- 2019-11-27 CN CN201922081021.1U patent/CN210745112U/en active Active
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