CN113948332B - Trigger detection circuit, button subassembly and tame electric installation of button - Google Patents

Trigger detection circuit, button subassembly and tame electric installation of button Download PDF

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Publication number
CN113948332B
CN113948332B CN202111271124.XA CN202111271124A CN113948332B CN 113948332 B CN113948332 B CN 113948332B CN 202111271124 A CN202111271124 A CN 202111271124A CN 113948332 B CN113948332 B CN 113948332B
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CN
China
Prior art keywords
port
trigger
detection circuit
control chip
key
Prior art date
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Application number
CN202111271124.XA
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Chinese (zh)
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CN113948332A (en
Inventor
余远昌
唐彬
邓新亮
王雪峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
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Priority to CN202111271124.XA priority Critical patent/CN113948332B/en
Publication of CN113948332A publication Critical patent/CN113948332A/en
Application granted granted Critical
Publication of CN113948332B publication Critical patent/CN113948332B/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H01H13/7065—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H01H13/7065—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards
    • H01H13/7073—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards characterised by springs, e.g. Euler springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

Abstract

The invention provides a trigger detection circuit of a key, a key assembly and household appliances. Wherein, the trigger detection circuit of button includes: n ports, wherein the ports are used for receiving or outputting electrical signals, N is an integer greater than 2; and the M triggering pieces are connected with the first port and the second port, and the first port and the second port are communicated based on the triggering condition of the triggering pieces, wherein the N ports comprise the first port and the second port, and M is an integer greater than or equal to N. According to the invention, the ports of the trigger detection circuit and the control chip are multiplexed, so that one port can switch functions between receiving electric signals and outputting electric signals, pins of the control chip can be multiplexed, port resources of the control chip can be effectively saved, and the household appliance can be provided with the control chip with fewer ports so as to meet the key detection requirement, thereby being beneficial to reducing the production cost of the household appliance.

Description

Trigger detection circuit, button subassembly and tame electric installation of button
Technical Field
The invention relates to the technical field of household appliances, in particular to a trigger detection circuit of a key, a key assembly and a household appliance.
Background
In the related art, the key circuit of the household appliances such as the microwave oven needs to occupy more controller ports, for example, a 4x4 key matrix needs 8 controller ports, which causes large resource requirements of the controller ports (chip pins) and is not beneficial to product cost control.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the present invention proposes a key trigger detection circuit.
A second aspect of the present invention provides a key assembly.
A third aspect of the present invention proposes a home appliance.
In view of this, a first aspect of the present invention provides a trigger detection circuit for a key, including: n ports, wherein the ports are used for receiving or outputting electrical signals, N is an integer greater than 2; and the M triggering pieces are connected with the first port and the second port, and the first port and the second port are communicated based on the triggering condition of the triggering pieces, wherein the N ports comprise the first port and the second port, and M is an integer greater than or equal to N.
In the technical scheme, the ports of the trigger detection circuit are correspondingly arranged with the ports of the control chip, namely, N ports of the trigger detection circuit correspond to N pins of the control chip. The port of the trigger detection circuit can receive the electric signal and also can output the electric signal.
Meanwhile, the trigger detection circuit is also provided with M trigger pieces, and each trigger piece is connected with two ports, specifically a first port and a second port. Specifically, the triggering pieces are switch-type triggering pieces, and each triggering piece corresponds to one key of the household appliance. When a user presses a certain key of the household appliance, the trigger piece is triggered and is switched from the off state to the on state, and at the moment, the first port and the second port connected with the triggered trigger piece are communicated.
Specifically, the first port and the second port may be used to receive or output an electrical signal, where the electrical signal may be a signal output by the control chip, for example, the main control chip outputs an electrical signal to the port a in a first period of time, at this time, if the trigger element between the port a and the port B is triggered, the port B returns the electrical signal to the main control chip, and the main control chip determines that the trigger element between the port a and the port B is triggered according to the returned electrical signal.
If the main control chip does not receive the return signal in the first time period, outputting an electric signal to the port B in the next second time period, and judging whether a trigger piece between the port B and the port C is triggered according to whether the electric signal returned by the port C is received or not.
Through multiplexing the port that triggers detection circuitry and control chip for a port can switch the function between receiving the electrical signal and outputting the electrical signal, thereby make control chip's pin can be multiplexed, thereby can effectively practice thrift control chip's port resource, thereby make tame electric installation can set up the control chip that has less port and can satisfy button detection demand, be favorable to reducing tame electric installation's manufacturing cost.
In addition, the trigger detection circuit in the technical scheme provided by the invention can also have the following additional technical characteristics:
in the above technical solution, the second port is configured to output an electrical signal based on a case that the first port receives the electrical signal.
In the technical scheme, the trigger piece of the trigger detection circuit is connected with the first port and the second port, and when the trigger piece is triggered, the trigger piece is conducted, so that a passage between the first port and the second port is conducted. One of the first port and the second port is used for receiving an electric signal, and the other is used for outputting a short signal, so that if the electric signal output by the control chip returns to the detection pin of the trigger chip through a passage formed by the first port, the trigger piece and the second port, the trigger piece is triggered, and the detection of the key pressed by a user is realized.
If the first port receives the electric signal, the electric signal is output through the second port, at this time, the pin of the control chip connected with the first port is an output pin, and the pin of the control chip connected with the second port is a detection pin. The port of the main control chip connected with the port of the trigger circuit can be multiplexed into the same receiving or outputting electric signals, and the pins of the main control chip connected with the port of the trigger circuit can be multiplexed into the outputting or detecting electric signals, so that the port resource of the control chip can be effectively saved, the control chip with fewer ports can be arranged for the household appliance to meet the key detection requirement, and the production cost of the household appliance is reduced.
In any of the above solutions, the N ports include a third port and a fourth port, where the third port is configured to receive an electrical signal, and the fourth port is configured to output an electrical signal.
In this technical solution, among the N ports of the trigger detection circuit, a third port for receiving an electrical signal and a fourth port for outputting an electrical signal are included. Specifically, the third port is connected with a constant output pin of the control chip, and the fourth port is connected with a constant detection port of the control chip. When the control chip scans the triggering states of the M triggering pieces, the control chip firstly controls the third port to receive the electric signals, the port 1 adjacent to the third port outputs the electric signals, the port 2 adjacent to the port 1 receives the electric signals, the port 3 adjacent to the port 2 outputs the electric signals … …, the port N-2 receives the electric signals, and the fourth port outputs the electric signals, so that the first scanning is completed.
Next, the control port 1 receives the electric signal, the port 2 outputs the electric signal, the port 3 receives the electric signal, the port 4 adjacent to the port 3 outputs the electric signal … …, the port N-3 receives the electric signal, the port N-2 outputs the electric signal, and at this time, the electric signal received by the third port is outputted from the fourth port.
By arranging the third port for receiving the electric signal in the normal time and the fourth port for outputting the electric signal in the normal time, the trigger detection circuit can complete the detection of the trigger states of all M trigger pieces only by changing the receiving/outputting states of the primary ports, the working efficiency of the trigger detection circuit is improved, and more accurate key trigger detection is realized.
In any of the above solutions, the trigger detection circuit further includes: and the second end of the first resistor is connected with the fourth port.
In the technical scheme, the trigger detection circuit comprises a first resistor, the first resistor is specifically a signal resistor between a third port and a fourth port, when a trigger piece between the third port and the fourth port is triggered, an electric signal is received by the third port, is limited by the first resistor, and returns to the control chip through the fourth port. The third port and the fourth port are respectively connected with the two pins of the control chip, and the first resistor is arranged, so that a short circuit is avoided between the pin corresponding to the third port and the pin corresponding to the fourth port when a trigger piece between the third port and the fourth port is started, stability and safety of the trigger circuit can be guaranteed, and reliability and service life of the household appliance are improved.
In any of the above solutions, the trigger detection circuit further includes: and the diode is connected with the fourth port and is conducted in the directions from the third port to the fourth port.
In the above technical solution, the trigger detection circuit includes a diode, specifically, the diode is connected to the fourth port and is turned on unidirectionally in a direction from the third port to the fourth port, that is, turned off in a direction from the third port to the fourth port. The fourth port is used for outputting an electric signal and is connected with the constant detection pin of the control chip, so that the diode is arranged to prevent the fourth port from receiving an interference signal, the detection accuracy of the trigger detection circuit is ensured, and the use experience of the household appliance is improved.
In any of the above solutions, the trigger detection circuit further includes: and the second resistor is connected with the first port and/or the second port.
In the technical scheme, the trigger detection circuit comprises a second resistor, the second resistor is specifically a signal resistor between the first port and the second port, when a trigger piece between the first port and the second port is triggered, an electric signal is received by the first port, is limited by the second resistor, and returns to the control chip through the second port. The first port and the second port are respectively connected with the two pins of the control chip, and the second resistor is arranged, so that a short circuit is avoided between the pin corresponding to the third port and the pin corresponding to the second port when the trigger piece between the first port and the second port is started, stability and safety of the trigger circuit can be guaranteed, and reliability and service life of the household appliance are improved.
In any of the above solutions, the trigger detection circuit further includes: and the first end of the third resistor is connected with the first port, the second port or the fourth port, and the second end of the third resistor is grounded.
In the technical scheme, the trigger detection circuit comprises N-1 third resistors, and all first ports, all second ports and all fourth ports except the third ports in N ports of the trigger detection circuit are grounded through one third resistor. Specifically, since the first port, the second port and the fourth port can all output the electrical signals, that is, the pins of the control chip to which the first port, the second port and the fourth port are connected can all receive the electrical signals.
Therefore, when the triggering pieces corresponding to the first port, the second port and the fourth port are not triggered, the paths of the ports are disconnected, the detection pins cannot receive any signals, and the main control chip cannot judge the working state of the triggering detection circuit.
In any of the above solutions, the trigger detection circuit further includes: and the first ends of the N capacitors are connected with the ports, and the second ends of the capacitors are grounded, wherein the N capacitors are in one-to-one correspondence with the N ports.
In the technical scheme, the trigger detection circuit is further provided with N capacitors, the N capacitors are respectively connected with the N ports, and the N capacitors are grounded. Specifically, when the port outputs or receives the electric signal, the electric signal can charge the capacitor, and after the capacitor is full, the capacitor can filter and stabilize the electric signal, so that the voltage value of the electric signal is more stable, the fluctuation of the voltage value of the electric signal can be effectively reduced, the detection precision of the trigger detection circuit is improved, the working efficiency of the trigger detection circuit is improved, and more accurate key trigger detection is realized.
In any of the above embodiments, the capacitor is a filter capacitor.
In the technical scheme, the capacitor is a filter capacitor, and each port of the trigger detection circuit is provided with a grounded filter capacitor, so that noise signals in the electric signals can be effectively filtered, the detection precision of the trigger detection circuit is improved, false triggering of the trigger detection circuit caused by the noise signals is prevented, the influence of interference on a control chip and a circuit can be reduced, false key triggering of the household appliance can be reduced, the reliability of the household appliance is improved, and the service life of the household appliance is prolonged.
In any of the above solutions, the trigger detection circuit further includes: the control chip comprises N pins, and the N pins are connected with the N ports in a one-to-one correspondence manner.
In the technical scheme, the trigger detection circuit comprises a control chip, the control chip comprises N pins, and the N pins are respectively connected with N ports of the trigger detection circuit. Specifically, the pin of the control chip can output an electric signal to the port of the trigger detection circuit, can detect an electric signal returned by the port of the trigger detection circuit, and can determine the trigger states of the M trigger pieces according to whether the returned electric signal can be detected.
Specifically, the main control chip outputs an electrical signal to the port a in a first time period, at this time, if the trigger piece between the port a and the port B is triggered, the port B returns the electrical signal to the main control chip, and the main control chip determines that the trigger piece between the port a and the port B is triggered according to the returned electrical signal.
If the main control chip does not receive the return signal in the first time period, outputting an electric signal to the port B in the next second time period, and judging whether a trigger piece between the port B and the port C is triggered according to whether the electric signal returned by the port C is received or not.
Through multiplexing the port that triggers detection circuitry and control chip for a port can switch the function between receiving the electrical signal and outputting the electrical signal, thereby make control chip's pin can be multiplexed, thereby can effectively practice thrift control chip's port resource, thereby make tame electric installation can set up the control chip that has less port and can satisfy button detection demand, be favorable to reducing tame electric installation's manufacturing cost.
In any of the above technical solutions, the N pins include a first pin, a second pin, and N-2 third pins, the first pin is connected to the third port, the second pin is connected to the fourth port, and the third pin is connected to the first port or the second port.
In the technical scheme, the N pins of the control chip comprise a first pin, a second pin and N-2 third pins. The first pin is connected with a third port of the trigger detection circuit, namely a constant output port of the control chip, and the first pin always outputs an electric signal to the third port. The second pin is connected with the fourth port of the trigger detection circuit, the second pin is a constant detection port of the control chip, and the second pin always detects whether the fourth port has a returned electric signal.
Meanwhile, the rest N-2 third pins can be circularly switched between two states of outputting an electric signal and detecting the electric signal, and are respectively connected with the first port or the second port of the trigger detection circuit. For example, of the N-2 third pins, pin 1 is connected to port 1, pin 2 is connected to port 2, and … … pin N-2 is connected to port N-2. In a first moment, pin 1 outputs an electrical signal to port 1, pin 2 detects whether port 2 returns an electrical signal, pin 3 outputs an electrical signal to port 3, pin 4 detects whether port 4 returns an electrical signal … …, pin N-3 outputs an electrical signal to port N-3, and pin N-2 is used to detect whether port N-2 returns an electrical signal.
According to the method and the device, the ports of the detection circuit and the control chip are triggered through multiplexing, so that one port can switch functions between receiving electric signals and outputting electric signals, pins of the control chip can be multiplexed, port resources of the control chip can be effectively saved, the control chip with fewer ports can be arranged for home appliances, key detection requirements can be met, and production cost of the home appliances is reduced.
A second aspect of the present invention provides a key assembly comprising: a key; the trigger detection circuit of the key provided in any one of the above technical solutions is connected with the key. Therefore, the key assembly includes all the advantages of the trigger detection circuit provided in any of the above solutions, and is not repeated here to avoid repetition.
In the above technical solution, the key includes: self-locking keys, mechanical axis keys or silicone keys.
In this technical solution, the keys comprise self-locking keys. When the self-locking key is pressed, the self-locking key can be locked in the pressed state, at the moment, the triggering piece corresponding to the self-locking key can also be kept in the triggered state, and the first port and the second port corresponding to the triggering piece are continuously kept communicated. When the user presses the self-locking key again, the self-locking state is released, the self-locking key is lifted, and the triggering piece restores the non-triggered disconnection state. Through setting up the auto-lock button, can realize the locking of tame electric installation function, improve tame electric installation's use experience.
The key also comprises a mechanical shaft key, the mechanical shaft key comprises a key cap and a switch shaft, a spring is arranged in the switch shaft, when the key cap is pressed down, the switch shaft is triggered, and the shaft body moves inwards and enables the trigger piece to be conducted. When the user lifts his hand, the shaft body of the switch shaft rebounds under the action of the elasticity of the spring, the key cap rebounds simultaneously, and the trigger piece is restored to the cut-off state. The mechanical shaft key has more excellent triggering handfeel, and the high-grade feeling of the household appliance can be improved by arranging the mechanical shaft key.
The button still includes the silica gel button, and the silica gel button includes the silica gel film to and set up the trigger body on the silica gel film, when the silica gel button was pressed by the user, the silica gel film took place deformation, and the trigger body contacted with the trigger piece, made the trigger piece switch on. When the user lifts his hand, the silica gel film returns to original state under the elastic action of the user, at this time, the trigger body is separated from the trigger piece, and the trigger piece is restored to the cut-off state. The silica gel key is low in cost, excellent in thermal stability and chemical stability, waterproof, and capable of improving durability and service life of household appliances on the basis of reducing the cost of the household appliances.
A third aspect of the present invention provides an electric home appliance, comprising a body; the key assembly provided in any one of the above technical solutions, wherein the key assembly is disposed on the body. Therefore, the home appliance also includes all the beneficial effects of the key assembly provided in any of the above technical schemes, and in order to avoid repetition, the description is omitted here.
In the above technical scheme, the household electrical appliance comprises a microwave oven, an electric cooker or an electromagnetic oven.
In this technical solution, it can be understood that the home electric device may be any home electric device including a key, and the home electric device may further include an air conditioner, a television, a stirrer, a wall breaking machine, a range hood, etc., which is not limited in this embodiment of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a circuit diagram of a trigger detection circuit according to an embodiment of the present invention;
fig. 2 shows a block diagram of a home appliance according to an embodiment of the present invention.
Reference numerals:
100 trigger detection circuit, 102 trigger, 104 first port, 106 second port, 108 third port, 110 fourth port, 112 first resistor, 114 diode, 116 second resistor, 118 third resistor, 120 capacitor, 122 control chip.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A trigger detection circuit for a key, a key assembly, and a home appliance according to some embodiments of the present invention are described below with reference to fig. 1 and 2.
Example 1
In some embodiments of the present invention, a trigger detection circuit of a key is provided, fig. 1 shows a circuit diagram of the trigger detection circuit according to an embodiment of the present invention, and as shown in fig. 1, the trigger detection circuit 100 includes:
n ports, wherein the ports are used for receiving or outputting electrical signals, N is an integer greater than 2; and M triggering pieces 102, wherein the triggering pieces 102 are connected with the first port 104 and the second port 106, and the first port 104 and the second port 106 are communicated based on the triggering of the triggering pieces 102, N ports comprise the first port 104 and the second port 106, and M is an integer greater than or equal to N.
In the embodiment of the present invention, the ports of the trigger detection circuit 100 are correspondingly arranged with the ports of the control chip 122, that is, the N ports of the trigger detection circuit 100 correspond to the N pins of the control chip 122. The port of the trigger detection circuit 100 can receive an electrical signal and also output an electrical signal.
Meanwhile, the trigger detection circuit 100 is further provided with M trigger pieces 102, and each trigger piece 102 is connected with two ports, specifically, a first port 104 and a second port 106. Specifically, the triggering members 102 are switch-type triggering members 102, and each triggering member 102 corresponds to one key of the home appliance. When a user presses a button of the home appliance, the trigger 102 is triggered and switched from an off state to an on state, and at this time, the first port 104 and the second port 106 connected to the triggered trigger 102 are connected.
Specifically, each of the first port 104 and the second port 106 may be configured to receive or output an electrical signal, where the electrical signal may be a signal output by the control chip 122, for example, the main control chip outputs an electrical signal to the port a in a first period of time, at this time, if the trigger 102 between the port a and the port B is triggered, the port B returns the electrical signal to the main control chip, and the main control chip determines that the trigger 102 between the port a and the port B is triggered according to the returned electrical signal.
If the main control chip does not receive the return signal in the first time period, outputting an electric signal to the port B in the next second time period, and judging whether the trigger piece 102 between the port B and the port C is triggered according to whether the electric signal returned by the port C is received or not.
Through multiplexing the ports of triggering detection circuit 100 and control chip 122 for a port can switch the function between receiving the electrical signal and outputting the electrical signal, thereby make control chip 122's pin can be multiplexed, thereby can effectively practice thrift control chip 122's port resource, thereby make tame electric installation can set up control chip 122 that has less port and can satisfy the button detection demand, be favorable to reducing tame electric installation's manufacturing cost.
In some embodiments of the present invention, the second port 106 is configured to output an electrical signal based on the first port 104 receiving the electrical signal.
In the embodiment of the present invention, the trigger element 102 of the trigger detection circuit 100 is connected to the first port 104 and the second port 106, and when the trigger element 102 is triggered, the trigger element 102 is turned on, so that the path between the first port 104 and the second port 106 is turned on. One of the first port 104 and the second port 106 is used for receiving an electrical signal, and the other is used for outputting a short signal, so if the electrical signal output by the control chip 122 returns to the detection pin of the trigger chip through the path formed by the first port 104, the trigger piece 102 and the second port 106, the trigger piece 102 is triggered, thereby realizing detection of the pressed key of the user.
If the first port 104 receives the electrical signal, the electrical signal is output through the second port 106, and at this time, the pin of the control chip 122 connected to the first port 104 is an output pin, and the pin of the control chip 122 connected to the second port 106 is a detection pin. The ports of the trigger detection circuit 100 can be multiplexed to receive or output the electric signals, and the pins of the main control chip connected with the ports of the trigger circuit can be multiplexed to output or detect the electric signals, so that the port resources of the control chip 122 can be effectively saved, the control chip 122 with fewer ports can be arranged for home appliances to meet the key detection requirement, and the production cost of the home appliances is reduced.
In some embodiments of the present invention, the N ports include a third port 108 and a fourth port 110, the third port 108 for receiving electrical signals and the fourth port 110 for outputting electrical signals.
In the embodiment of the present invention, among the N ports of the trigger detection circuit 100, a third port 108 for receiving an electrical signal is included, and a fourth port 110 for outputting an electrical signal is also included. Specifically, the third port 108 is connected to a constant output pin of the control chip 122, and the fourth port 110 is connected to a constant detection port of the control chip 122. When the control chip 122 scans the triggering states of the M triggering pieces 102, it first controls the third port 108 to receive the electrical signal, the port 1 adjacent to the third port 108 outputs the electrical signal, the port 2 adjacent to the port 1 receives the electrical signal, the port 3 adjacent to the port 2 outputs the electrical signal … …, the port N-2 receives the electrical signal, and the fourth port 110 outputs the electrical signal, thereby completing the first scan.
Next, the control port 1 receives the electric signal, the port 2 outputs the electric signal, the port 3 receives the electric signal, the port 4 adjacent to the port 3 outputs the electric signal … …, the port N-3 receives the electric signal, the port N-2 outputs the electric signal, and at this time, the electric signal received by the third port 108 is outputted by the fourth port 110.
By arranging the third port 108 for receiving the electrical signal in the normal time and the fourth port 110 for outputting the electrical signal in the normal time, the trigger detection circuit 100 can complete the detection of the trigger states of all the M trigger pieces 102 only by changing the receiving/outputting states of the ports once, thereby improving the working efficiency of the trigger detection circuit 100 and realizing more accurate key trigger detection.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: the first resistor 112, the first end of the first resistor 112 is connected to the third port 108, and the second end of the first resistor 112 is connected to the fourth port 110.
In the embodiment of the present invention, the trigger detection circuit 100 includes a first resistor 112, and the first resistor 112 is specifically a signal resistor between the third port 108 and the fourth port 110, and when the trigger 102 between the third port 108 and the fourth port 110 is triggered, an electrical signal is received by the third port 108, and after being limited by the first resistor 112, the electrical signal returns to the control chip 122 through the fourth port 110. Wherein, because the third port 108 and the fourth port 110 are respectively connected with two pins of the control chip 122, by setting the first resistor 112, when the trigger piece 102 between the third port 108 and the fourth port 110 is started, a short circuit is avoided between the pin corresponding to the third port and the pin corresponding to the fourth port 110, so that the stability and safety of the trigger circuit can be ensured, and the reliability and service life of the home appliance can be improved.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: a diode 114 is connected to the fourth port 110, and the diode 114 is turned on in the direction from the third port 108 to the fourth port 110.
In some embodiments of the present invention, the trigger detection circuit 100 includes a diode 114, specifically, the diode 114 is connected to the fourth port 110 and is turned on unidirectionally in a direction from the third port 108 to the fourth port 110, that is, turned off in a direction of the third port 108 of the fourth port 110. Because the fourth port 110 is configured to output an electrical signal, and is connected to a common detection pin of the control chip 122, the diode 114 is configured to prevent the fourth port 110 from receiving an interference signal, thereby ensuring detection accuracy of the trigger detection circuit 100, and being beneficial to improving use experience of the home appliance.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: and a second resistor 116, the second resistor 116 being connected to the first port 104 and/or the second port 106.
In the embodiment of the present invention, the trigger detection circuit 100 includes a second resistor 116, where the second resistor 116 is specifically a signal resistor between the first port 104 and the second port 106, and when the trigger 102 between the first port 104 and the second port 106 is triggered, an electrical signal is received by the first port 104, and after being limited by the second resistor 116, the electrical signal returns to the control chip 122 through the second port 106. Because the first port 104 and the second port 106 are respectively connected with two pins of the control chip 122, by setting the second resistor 116, when the trigger piece 102 between the first port 104 and the second port 106 is started, a short circuit is avoided between the pin corresponding to the third port and the pin corresponding to the second port 106, so that the stability and safety of the trigger circuit can be ensured, and the reliability and the service life of the household electrical appliance can be improved.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: n-1 third resistors 118, a first end of the third resistor 118 is connected to the first port 104, the second port 106 or the fourth port 110, and a second end of the third resistor 118 is grounded.
In the embodiment of the present invention, the trigger detection circuit 100 includes N-1 third resistors 118, and all of the first ports 104, all of the second ports 106, and the fourth ports 110 except the third port 108 among the N ports of the trigger detection circuit 100 are grounded through one third resistor 118. Specifically, since the first port 104, the second port 106, and the fourth port 110 can all output electrical signals, that is, the pins of the control chip 122 to which the first port 104, the second port 106, and the fourth port 110 are connected can all receive electrical signals.
Therefore, when the trigger 102 corresponding to the first port 104, the second port 106 and the fourth port 110 is not triggered, the paths of the ports are disconnected, and the detection pins cannot receive any signal, which may cause the main control chip to fail to determine the working state of the trigger detection circuit 100, so that the detection end of the main control chip is grounded through the third resistor 118 by setting the grounded third resistor 118, and the main control chip can receive the grounding signal and use the grounding signal as the reference signal, which is beneficial to determining whether the device is in the working state according to the grounding signal by the main control chip, and improving the working stability and reliability of the trigger detection circuit 100.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: and N capacitors 120, wherein the first ends of the capacitors 120 are connected with the ports, and the second ends of the capacitors 120 are grounded, and the N capacitors 120 are in one-to-one correspondence with the N ports.
In the embodiment of the present invention, the trigger detection circuit 100 is further provided with N capacitors 120, where the N capacitors 120 are connected to the N ports, and the N capacitors 120 are grounded. Specifically, when the port outputs or receives the electric signal, the electric signal can charge the capacitor 120, and after the capacitor 120 is full, the capacitor 120 can filter and stabilize the electric signal, so that the voltage value of the electric signal is more stable, the fluctuation of the voltage value of the electric signal can be effectively reduced, the detection precision of the trigger detection circuit 100 is improved, the working efficiency of the trigger detection circuit 100 is improved, and more accurate key trigger detection is realized.
In some embodiments of the present invention, the capacitor 120 is a filter capacitor 120.
In the embodiment of the invention, the capacitor 120 is a filter capacitor, and a grounded filter capacitor is arranged on each port of the trigger detection circuit 100, so that noise signals in the electric signals can be effectively filtered, thereby improving the detection precision of the trigger detection circuit 100, preventing the false triggering of the trigger detection circuit 100 caused by the noise signals, reducing the influence of interference on the control chip 122 and the circuit, and reducing the false triggering of keys of the household electrical appliance, so as to improve the reliability of the household electrical appliance and the service life of the household electrical appliance.
In some embodiments of the present invention, the trigger detection circuit 100 further comprises: the control chip 122 includes N pins, where the N pins are connected to the N ports in a one-to-one correspondence.
In the embodiment of the present invention, the trigger detection circuit 100 includes a control chip 122, where the control chip 122 includes N pins, and the N pins are respectively connected to N ports of the trigger detection circuit 100. Specifically, the pins of the control chip 122 can output an electrical signal to the ports of the trigger detection circuit 100, and can also detect an electrical signal returned from the ports of the trigger detection circuit 100, and determine the trigger states of the M triggers 102 according to whether the returned electrical signal can be detected.
Specifically, the main control chip outputs an electrical signal to the port a in the first period, and at this time, if the trigger 102 between the port a and the port B is triggered, the port B returns the electrical signal to the main control chip, and the main control chip determines that the trigger 102 between the port a and the port B is triggered according to the returned electrical signal.
If the main control chip does not receive the return signal in the first time period, outputting an electric signal to the port B in the next second time period, and judging whether the trigger piece 102 between the port B and the port C is triggered according to whether the electric signal returned by the port C is received or not.
Through multiplexing the ports of triggering detection circuit 100 and control chip 122 for a port can switch the function between receiving the electrical signal and outputting the electrical signal, thereby make control chip 122's pin can be multiplexed, thereby can effectively practice thrift control chip 122's port resource, thereby make tame electric installation can set up control chip 122 that has less port and can satisfy the button detection demand, be favorable to reducing tame electric installation's manufacturing cost.
In some embodiments of the present invention, the N pins include a first pin connected to the third port 108, a second pin connected to the fourth port 110, and N-2 third pins connected to the first port 104 or the second port 106.
In the embodiment of the present invention, the N pins of the control chip 122 include a first pin, a second pin, and N-2 third pins. The first pin is connected to the third port 108 of the trigger detection circuit 100, i.e. the constant output port of the control chip 122, and outputs an electrical signal to the third port 108 all the time. The second pin is connected to the fourth port 110 of the trigger detection circuit 100, and the second pin is a constant detection port of the control chip 122 and always detects whether the fourth port 110 has a returned electric signal.
Meanwhile, the remaining N-2 third pins can be cyclically switched between two states of outputting an electrical signal and detecting an electrical signal, and are respectively connected to the first port 104 or the second port 106 of the trigger detection circuit 100. For example, of the N-2 third pins, pin 1 is connected to port 1, pin 2 is connected to port 2, and … … pin N-2 is connected to port N-2. In a first moment, pin 1 outputs an electrical signal to port 1, pin 2 detects whether port 2 returns an electrical signal, pin 3 outputs an electrical signal to port 3, pin 4 detects whether port 4 returns an electrical signal … …, pin N-3 outputs an electrical signal to port N-3, and pin N-2 is used to detect whether port N-2 returns an electrical signal.
The port of the detection circuit 100 and the port of the control chip 122 are triggered through multiplexing, so that one port can switch functions between receiving electric signals and outputting electric signals, pins of the control chip 122 can be multiplexed, port resources of the control chip 122 can be effectively saved, the control chip 122 with fewer ports can be arranged for home appliances to meet key detection requirements, and production cost of the home appliances is reduced.
Example two
In some embodiments of the present invention, the number of detection keys can be increased according to the number of ports set. Specifically, the following table 1 shows:
TABLE 1
Port number Number of keys detected
3 3＝1+2
4 6＝1+2+3
5 10＝1+2+3+4
6 15＝1+2+3+4+5
7 21＝1+2+3+4+5+6
8 28＝1+2+3+4+5+6+7
n 1+2+3+……+(n-1)
As shown in table 1 and fig. 1, specifically, detection of different keys can be achieved by means of software scanning N ports.
Specifically:
when the port 1 is an output and the ports 2 to 8 are inputs, the trigger states of the triggers S11 to S17 can be detected.
When the port 2 is an output and the ports 3 to 8 are inputs, the detection of the trigger states of the triggers S22 to S27 can be realized.
When the port 3 is an output and the ports 4 to 8 are inputs, the trigger states of the triggers S33 to S37 can be detected.
When the port 4 is an output and the ports 5 to 8 are inputs, the detection of the trigger states of the triggers S44 to S47 can be realized.
When the port 5 is an output and the ports 6 to 8 are inputs, the trigger states of the triggers S55 to S57 can be detected.
When the port 6 is an output and the ports 7 to 8 are inputs, the detection of the trigger states of the triggers S66 to S67 can be realized.
When the port 7 is an output and the port 8 is an input, the trigger state of the trigger S77 can be detected.
Example III
In some embodiments of the present invention, a key trigger detection circuit includes: an input for receiving an electrical signal; the voltage dividing circuit is connected with the input end and used for dividing the electric signal; the trigger component is connected with the voltage dividing circuit and the control chip and used for sending the electric signals after voltage division to the control chip, wherein the trigger component is provided with a plurality of trigger states, and the trigger states can change the voltage dividing ratio of the voltage dividing circuit; and the control chip is used for determining the triggering state of the triggering component according to the voltage value of the electric signal after the voltage division.
In the embodiment of the invention, the trigger detection circuit comprises an input end, a voltage dividing circuit, a trigger component and a control chip, wherein the input end is connected with a direct current source and is used for receiving an electric signal, the electric signal is a direct current signal, and the initial voltage value of the electric signal can be set to be 5V or 12V.
The voltage dividing circuit is connected with the input end, and the trigger component is connected with the voltage dividing circuit. The trigger assembly includes a plurality of trigger pieces, one trigger piece corresponding to each key structure. When the key structure is pressed, the corresponding trigger piece on the trigger component is triggered, wherein the trigger component comprises a plurality of trigger states, and specifically, one trigger piece or a plurality of trigger pieces in the plurality of trigger pieces is triggered by the plurality of trigger states, namely, a user presses different keys or presses more than 2 or more than 2 combined keys simultaneously.
Different triggering states of the triggering component can enable the voltage dividing circuit to work at different voltage dividing ratios, so that the voltage dividing circuit outputs electric signals with different voltage values. Specifically, for example, it is assumed that 2 triggering pieces are provided in the triggering assembly, corresponding to 2 keys of the microwave oven, namely a key a and a key B. When the key a is pressed, the trigger state at this time is set to be state 1, when the key B is pressed, the trigger state at this time is set to be state 2, and when the key a and the key B are simultaneously pressed, the trigger state at this time is set to be state 3.
When the trigger state is state 1, it is assumed that the voltage division ratio of the corresponding voltage division circuit is 1:1, the voltage value of the electric signal output by the voltage dividing circuit is half of the voltage value received by the input end, taking the original voltage value of the electric signal received by the input end as 5V as an example, and the voltage value of the electric signal received by the control chip is 2.5V.
When the trigger state is state 2, it is assumed that the voltage division ratio of the corresponding voltage division circuit is 1:2, the voltage value of the electric signal output by the voltage dividing circuit is one third of the electric signal received by the input end, and the original voltage value of the electric signal received by the input end is 5V, and the voltage value of the electric signal received by the control chip is 1.67V.
When the trigger state is state 3, it is assumed that the voltage division ratio of the corresponding voltage division circuit is 2:1, the voltage value of the electric signal output by the voltage dividing circuit is two thirds of the electric signal received by the input end, the original voltage value of the electric signal received by the input end is 5V, and the voltage value of the electric signal received by the control chip is 3.33V.
Therefore, according to different trigger states of the trigger component, the voltage dividing circuit can be enabled to change the voltage dividing ratio of the trigger component, so that the voltage value of the electric signal output by the voltage dividing circuit corresponds to the trigger state of the trigger component, when the control chip receives the electric signal after the voltage division output by the voltage dividing circuit, the actual trigger state of the trigger component can be judged according to the voltage value of the received electric signal, and therefore a user can be determined to specifically press one or more keys, detection of the key trigger state is achieved, detection of a series of factors such as software programming scanning time sequence, artificial programming code difference and the like affecting the key state can be effectively avoided, and influence of interference on the control chip and the circuit can be reduced.
Meanwhile, only one port of the control chip is occupied in the process, and the port resource of the control chip is solved, so that the household appliance can be provided with the control chip with fewer ports to meet the key detection requirement, and the production cost of the household appliance is reduced.
It can be understood that in the actual setting process, the voltage value ranges output by the voltage dividing circuit can be respectively recorded when different keys are pressed, and the voltage value ranges are set into corresponding voltage comparison tables, the voltage comparison tables are stored in the flash memory of the control chip, and when the corresponding ports (or pins) of the control chip receive the electric signals, the keys specifically pressed by the user are determined according to the voltage values of the electric signals and the mapping closing of the voltage comparison tables.
Example IV
In some embodiments of the present invention, there is provided a key assembly including: a key; the trigger detection circuit of a key provided in any one of the embodiments above, wherein the trigger detection circuit of the key is connected with the key.
In the embodiment of the invention, the ports of the trigger detection circuit and the control chip are multiplexed, so that one port can switch functions between receiving electric signals and outputting electric signals, pins of the control chip can be multiplexed, port resources of the control chip can be effectively saved, the household appliance can be provided with the control chip with fewer ports, the key detection requirement can be met, and the production cost of the household appliance is reduced.
In some embodiments of the invention, the key comprises: self-locking keys, mechanical axis keys or silicone keys.
In an embodiment of the invention, the keys comprise self-locking keys. When the self-locking key is pressed, the self-locking key can be locked in the pressed state, at the moment, the triggering piece corresponding to the self-locking key can also be kept in the triggered state, and the first port and the second port corresponding to the triggering piece are continuously kept communicated. When the user presses the self-locking key again, the self-locking state is released, the self-locking key is lifted, and the triggering piece restores the non-triggered disconnection state. Through setting up the auto-lock button, can realize the locking of tame electric installation function, improve tame electric installation's use experience.
The key also comprises a mechanical shaft key, the mechanical shaft key comprises a key cap and a switch shaft, a spring is arranged in the switch shaft, when the key cap is pressed down, the switch shaft is triggered, and the shaft body moves inwards and enables the trigger piece to be conducted. When the user lifts his hand, the shaft body of the switch shaft rebounds under the action of the elasticity of the spring, the key cap rebounds simultaneously, and the trigger piece is restored to the cut-off state. The mechanical shaft key has more excellent triggering handfeel, and the high-grade feeling of the household appliance can be improved by arranging the mechanical shaft key.
The button still includes the silica gel button, and the silica gel button includes the silica gel film to and set up the trigger body on the silica gel film, when the silica gel button was pressed by the user, the silica gel film took place deformation, and the trigger body contacted with the trigger piece, made the trigger piece switch on. When the user lifts his hand, the silica gel film returns to original state under the elastic action of the user, at this time, the trigger body is separated from the trigger piece, and the trigger piece is restored to the cut-off state. The silica gel key is low in cost, excellent in thermal stability and chemical stability, waterproof, and capable of improving durability and service life of household appliances on the basis of reducing the cost of the household appliances.
Example five
In some embodiments of the present invention, there is provided an electric home appliance, fig. 2 shows a block diagram of the electric home appliance according to an embodiment of the present invention, and as shown in fig. 2, an electric home appliance 200 includes: a body 202; as with the key assembly 204 provided in any of the embodiments described above, the key assembly 204 is disposed on the body 202. Therefore, the home appliance also includes all the advantages of the key assembly provided in any of the above embodiments, and in order to avoid repetition, the description is omitted here.
In some embodiments of the invention, the home appliance comprises a microwave oven, an electric rice cooker, or an electromagnetic oven.
In the embodiment of the present invention, it can be understood that the home appliance may be any home appliance including a key, and the home appliance may also include, for example, an air conditioner, a television, a stirrer, a wall breaking machine, a range hood, and the like, which is not limited in the embodiment of the present invention.
In the description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are orientation or positional relationship based on the drawings, merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A trigger detection circuit for a key, comprising:
n ports, wherein the ports are used for receiving or outputting electrical signals, N is an integer greater than 2, and the N ports include a third port and a fourth port;
the trigger pieces are connected with a first port and a second port, and the first port is communicated with the second port based on the condition that the trigger pieces are triggered, wherein the N ports comprise the first port and the second port, and M is an integer greater than or equal to N;
The first end of the third resistor is connected with the first port, the second port or the fourth port, and the second end of the third resistor is grounded;
and the first ends of the N capacitors are connected with the ports, and the second ends of the capacitors are grounded, wherein the N capacitors are in one-to-one correspondence with the N ports.
2. The trigger detection circuit of claim 1, wherein the second port is configured to output an electrical signal based on the first port receiving the electrical signal.
3. The trigger detection circuit of claim 1, wherein the third port is configured to receive an electrical signal and the fourth port is configured to output an electrical signal.
4. The trigger detection circuit of claim 3, further comprising:
and the first end of the first resistor is connected with the third port, and the second end of the first resistor is connected with the fourth port.
5. The trigger detection circuit of claim 3, further comprising:
and the diode is connected with the fourth port and is conducted in the direction from the third port to the fourth port.
6. The trigger detection circuit of any one of claims 1 to 5, further comprising:
and the second resistor is connected with the first port and/or the second port.
7. The trigger detection circuit of claim 1, wherein the capacitor is a filter capacitor.
8. The trigger detection circuit of any one of claims 3 to 5, further comprising:
the control chip comprises N pins, and the N pins are connected with the N ports in a one-to-one correspondence manner.
9. The trigger detection circuit of claim 8, wherein the N pins comprise a first pin, a second pin, and N-2 third pins, the first pin being connected to the third port, the second pin being connected to the fourth port, the third pin being connected to the first port or the second port.
10. A key assembly, comprising:
a key;
the key trigger detection circuit according to any one of claims 1 to 9, wherein the key trigger detection circuit is connected to the key.
11. The key assembly of claim 10, wherein the key comprises:
Self-locking keys, mechanical axis keys or silicone keys.
12. An electrical home appliance, comprising:
a body;
a key assembly according to claim 10 or 11, said key assembly being provided on said body.
13. The home appliance of claim 12, wherein the home appliance comprises:
microwave ovens, electric cookers or induction cookers.
CN202111271124.XA 2021-10-29 2021-10-29 Trigger detection circuit, button subassembly and tame electric installation of button Active CN113948332B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0527893A (en) * 1991-07-17 1993-02-05 Ibiden Co Ltd Input/output control device
KR19990027755A (en) * 1997-09-30 1999-04-15 전주범 Key matrix input circuit using one port in microcomputer
CN101162905A (en) * 2006-10-13 2008-04-16 鸿富锦精密工业（深圳）有限公司 Keyboard scanning circuit and method
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