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AD port extension method for control chip MCU (Microprogrammed Control Unit) and multichannel expanding circuit

A control chip and port expansion technology, applied in the field of multi-channel expansion circuits, can solve the problems of difficult circuit board layout and high production cost, and achieve the effects of simple structure, low cost and efficient utilization

Inactive Publication Date: 2014-04-30
GUANGDONG REAL DESIGN INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to provide a method for expanding the AD port of the control chip MCU in order to solve the problems of high production cost and difficult circuit board layout in the existing integrated circuit AD port expansion

Method used

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  • AD port extension method for control chip MCU (Microprogrammed Control Unit) and multichannel expanding circuit

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Experimental program
Comparison scheme
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specific Embodiment 1

[0022] refer to figure 1 , the multi-channel extension circuit of the AD port of the control chip MCU involved in this embodiment includes a control chip MCU and an AD input circuit 1 with an AD port and several I / O ports, and the AD input circuit 1 is composed of several AD ports. The input signal circuit is composed of several ordinary I / O ports of the control chip MCU, each connected to one AD input signal circuit, and each input terminal of each AD input signal circuit of the AD input circuit is connected together and passed through the voltage divider circuit 2 and The AD port of the control chip MCU is connected through the filter circuit 4, and the other input end of each AD input signal circuit is connected with an I / O port of the control chip MCU to form an AD channel selection circuit 3; controlled by the control chip MCU in turn Scan the I / O port, strobe each AD input signal and detect the input signal of the AD port to measure the input value of each AD port respec...

specific Embodiment 2

[0033] The characteristics of specific embodiment 2 of the present invention are:

[0034] The voltage dividing circuit 2 may be composed of a voltage dividing resistor connected to the ground GND. The control chip MCU controls the strobe level of each AD input signal to be a high level, and the other two AD input signals that are not strobed are in an input high-impedance state. All the other are with specific embodiment 1.

[0035] The present invention uses multiple I / O ports to control the function of multiple AD port input signals being input from one AD port, realizes the purpose of efficiently utilizing chip AD ports and I / O port resources, and has the advantages of simple structure, low production cost and convenience Beneficial effects of circuit layout.

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Abstract

The invention relates to an AD port extension method for a control chip MCU (Microprogrammed Control Unit) and a multichannel expanding circuit. The AD port extension method for the control chip MCU is characterized in that the control chip MCU which is provided an AD port and a plurality of I / O (Input / Output) ports are connected with an AD input circuit; one input terminal of every AD input signal loop of the AD input circuit are connected with the AD port of the MCU after being connected together; the other one input terminal of every AD input signal circuit is connected with the one I / O port of every control chip MCU; the control chip MCU which is used for controlling every AD input signal to be communicated by turns detects input signals of the AD port to measure an input value of every AD port and form into the AD port multichannel expanding circuit which is controlled by the control chip MCU. The AD port extension method for the control chip MCU has the advantages of being simple in circuit, few in used elements, low in cost, enabling the multi-channel AD port input signals to be input from the one AD port through the plurality of I / O ports and achieving purposes of efficiently using the chip AD port and the I / O port resources.

Description

technical field [0001] The invention relates to an AD port expansion method and a multi-channel expansion circuit of a control chip MCU. It belongs to the field of applied electronic technology. Background technique [0002] At present, in the field of electronic control, home appliance control circuit boards and other small equipment control circuit boards need multiple AD port inputs as detection signals, for example, to detect the temperature, humidity and other control signal quantities of home appliances, while general control chips The AD port resources of the chip are less, when it is necessary to detect multiple signals, the AD port of the control chip must be expanded. In the prior art, when extending the AD interface, an integrated chip circuit is usually used for expansion, but the solution of using this integrated circuit expansion has the defects of high cost and difficult circuit board layout. Therefore, how to use limited chip resources reasonably and effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/20
Inventor 方桦何卫文
Owner GUANGDONG REAL DESIGN INTELLIGENT TECH
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