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I/O port expansion circuit

A technology for expanding circuits and circuits, which is applied in the direction of logic circuits, logic circuit connection/interface layout, electrical components, etc., and can solve problems such as the limited number of I/O ports of single-chip microcomputers, insufficient I/O ports of single-chip microcomputers, and rising costs. , to achieve the effect achieved by the resistance device

Inactive Publication Date: 2008-07-23
SHENZHEN H&T INTELLIGENT CONTROL
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In applications such as household appliances, single-chip microcomputers are usually used as the main control chip. The number of I / O ports of the single-chip microcomputer is very limited. In the application, it is often encountered that the I / O ports of the single-chip microcomputer are not enough, and sometimes there is only one I / O port. / O port, if you need to replace more I / O port control chips at this time, the cost will increase significantly

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Embodiment Construction

[0017] Fig. 1 is the circuit schematic diagram of the I / O port expansion circuit of the present invention, wherein VCC is the power supply terminal, R1 is the first series resistance, R2 is the second series resistance, C1 is the series capacitance, TR1 is the PNP triode; R1, R2, C1 and TR1 constitute a reverse drive circuit.

[0018] R3 is the third series resistor, R7 is the first voltage dividing resistor, R8 is the second voltage dividing resistor, C3 is the first energy storage capacitor, TR3 is the first NPN triode; R3, R7, R8, C3 and TR3 constitute the first Drive circuit; R5 is the fourth series resistor, R4 is the third voltage dividing resistor, R6 is the fourth voltage dividing resistor, C2 is the second energy storage capacitor, TR2 is the second NPN transistor; R5, R4, R6, C2 and TR2 A second drive circuit is formed.

[0019] The connection point of R2 and R3 is the input port, the collector of TR3 is the first output port, and the collector of TR2 is the second ...

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Abstract

The invention relates to an I / O port extend circuit, which comprises an input port, a first output port and a second output port, a reverse drive circuit for converting signal electrical level, a first drive circuit and a second drive circuit for converting pulse signal into electrical level signal, wherein the input of the first drive circuit is connected with the input port, the output of the first drive circuit is connected with the first output port, the input of the reverse drive circuit is connected with the input port, while the output is connected with the input of the second drive circuit, the output of the second drive circuit is connected with the second the output port. The reverse drive circuit, first drive circuit and the second drive circuit utilize simple components as resistance, capacitors and transistors, which can extend I / O port without additional cost.

Description

technical field [0001] The invention relates to an I / O port circuit, more specifically, to an I / O port expansion circuit. Background technique [0002] In applications such as household appliances, single-chip microcomputers are usually used as the main control chip. The number of I / O ports of the single-chip microcomputer is very limited. In the application, it is often encountered that the I / O ports of the single-chip microcomputer are not enough, and sometimes there is only one I / O port. / O port, at this time, if more I / O port control chips need to be replaced, the cost will increase significantly. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an I / O port expansion circuit in view of the defect that the number of I / O ports of the above-mentioned single-chip microcomputer system in the prior art is small. [0004] The technical solution adopted by the present invention to solve the technical problems is: con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40H03K19/0175H03K19/018
Inventor 姜西辉刘建伟蒋洪波
Owner SHENZHEN H&T INTELLIGENT CONTROL
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