A bidirectional level conversion circuit

A technology for converting circuits and levels, applied in the direction of logic circuit connection/interface layout, etc., can solve the problems of affecting development and production progress, long delivery cycle, high cost, etc., to reduce production costs and business risks, strong driving ability, Strong anti-interference ability

Inactive Publication Date: 2007-07-11
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of this type of special conversion device is very high, generally more than 5 times higher than that of commonly used devices, and it is difficult to purchase in the general market. It needs to be ordered specially, and the delivery cycle is long, which affects the development and production progress and creates certain production and operation risks.

Method used

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  • A bidirectional level conversion circuit
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  • A bidirectional level conversion circuit

Examples

Experimental program
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Embodiment 1

[0024] Referring to Fig. 1, the level conversion circuit diagram of Embodiment 1 is given.

[0025] This embodiment implements level conversion between 3.3V bidirectional port and 5V input port and output port, including triode Q1, Schottky diode D1, resistor R1, resistor R2, resistor R4 and resistor R5. The base and collector of the transistor Q1 are respectively connected to the 3.3V bidirectional port, which is the 3V3_OUT_IN port, and the 5V input port, which is the 5V_IN port, and the emitter of the transistor Q1 is grounded; the positive and negative electrodes of the diode D1 are respectively connected to the 3.3V bidirectional port, which is the 3V3_OUT_IN port and the 5V output port Namely the 5V_OUT port.

[0026] The working principle of this embodiment is as follows: when the 3V3_OUT_IN port is used as an input, if the 5V_OUT port outputs a high level, the diode D1 is cut off, and the 3V3_OUT_IN port is pulled up to a high level by the resistor R4; if the 5V_OUT po...

Embodiment 2

[0030] In order to overcome the above shortcomings, on the basis of embodiment 1, embodiment 2 is proposed, as shown in FIG. 2 .

[0031] This embodiment realizes the level conversion between the 3.3V bidirectional port 3V3_OUT_IN and the 5V input port 5V_IN and the output port 5V_OUT, including transistor Q1, Schottky diode D1, 7 4HC14 inverter U1B and resistor R1, resistor R2, resistor R4 and resistor R5. The base and collector of the transistor Q1 are respectively connected to the 3V3_OUT_IN port and the 5V_IN port, and the emitter of the transistor Q1 is grounded; the 5V_OUT port is connected to the 3V3_OUT_IN port through the inverter U1B and the diode D1, and the input terminal of the inverter U1B is connected to the 5V_OUT port, and the output terminal Connect the cathode of diode D1; connect the anode of diode D1 to the 3V3_OUT_IN port.

[0032] The working principle of this embodiment is as follows: when the 3V3_OUT_IN port is an input, if the 5V_OUT port outputs a h...

Embodiment 3

[0036] On the basis of the above embodiments, a further improvement scheme is proposed. As shown in Figure 3, an inverter U1C is added between the output terminal of the inverter U1B and the cathode of the diode D1. The inverter uses a 74HC14 device to receive the level signal output by U1B and output it to The cathode of diode D1. The working principle of this circuit is similar to that of Embodiment 2, so it will not be described in detail.

[0037] The 5V_OUT port output to the 3V3_OUT_IN port input in Embodiment 2 is reversed, while the 5V_OUT port output to the 3V3_OUT_IN port input in this embodiment is in the same direction. Compared with the above embodiment, this embodiment has stronger driving capability and stronger anti-interference ability.

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Abstract

This invention provides one double level conversion circuit to realize low level end double ends and high level ends signal input end and output end conversion, which comprises switch partsQ1, diode D1, switch part Q1 base electrode, integral electrode are connected to the double direction end of low level and input end of high level; the switch part Q1 is connected to emission electrode; the diode tube D1 anode and cathode are connected to the low level double ends and high level output ends.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a bidirectional level conversion circuit. Background technique [0002] At present, with the development of the integrated circuit industry and the continuous innovation of electronic products, the application of 3.3V electronic devices such as MCU is more and more widely used. The working level of the input or output ports of such electronic devices is usually 3.3V; Electronic devices that work at 5V are often used in circuit design and actual production, such as A / D and I2C bus devices of serial ports that work at 5V; and the logic level of 3.3V is the same as the logic level of 5.5V. Therefore, when designing the interconnection interface of 3.3V logic level and 5V logic level, the level matching and driving ability of the logic level must be considered to ensure the high stability and reliability of the circuit, thereby improving the anti-interference ability of the system . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 周泽万陈巍吕敬民
Owner EMERSON NETWORK POWER CO LTD
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