Key collection circuit

A technology for collecting circuits and buttons, which is applied in the field of control switches, can solve problems such as difficult replacement, complex control chip changes, and high cost of multi-pin chips, and achieve cost-saving, low-cost, and good flexibility effects

Inactive Publication Date: 2013-05-01
HEFEI MIDEA REFRIGERATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, each button will occupy a chip pin. With the development of household appliances such as refrigerators, more and more functions are required, and there are more and more buttons. It is necessar

Method used

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Embodiment Construction

[0012] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0013] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the descrip...

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Abstract

The invention provides a key collection circuit, which comprises a plurality of key branches which are mutually connected in parallel, a public resistor and a control chip, wherein each key branch comprises a key and a branch resistor; a user opens and closes the key to realize functional selection; the resistance values of the branch resistors of different key branches are different, and each branch resistor is connected with the related key in series; the public resistor is connected with the key branches for series connecting allotting; and the control chip collects electric potential between the public resistor and the key branches, judges the type of the key according to the collected electric potential, and executes the corresponding functions of the keys. The key collection circuit has the advantages of low cost and good flexibility.

Description

technical field [0001] The invention relates to the field of control switches, in particular to a key collecting circuit. Background technique [0002] In household appliances such as refrigerators, there are usually multiple buttons on the control panel. After the user presses the button, the corresponding button function will be realized. The most common method of key collection is as figure 1 As shown, the multiple keys are respectively SW1, SW2, SW3...they are respectively connected to a pin of the control chip. The control chip keeps collecting the status of all keys. Under normal circumstances, if the chip collects that no key is pressed, the corresponding control will not be executed. If a button is pressed, it will be collected by the chip immediately, and then it is judged which button is pressed, and the function of the corresponding button is executed. In this method, each button will occupy a chip pin. With the development of household appliances such as refr...

Claims

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Application Information

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IPC IPC(8): H03M11/02
Inventor 孙超申在成刘富明付秀亮祝云飞韦文波
Owner HEFEI MIDEA REFRIGERATOR CO LTD
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