CN103135054A - Press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and integration achieving method - Google Patents

Press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and integration achieving method Download PDF

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Publication number
CN103135054A
CN103135054A CN2013100367533A CN201310036753A CN103135054A CN 103135054 A CN103135054 A CN 103135054A CN 2013100367533 A CN2013100367533 A CN 2013100367533A CN 201310036753 A CN201310036753 A CN 201310036753A CN 103135054 A CN103135054 A CN 103135054A
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China
Prior art keywords
remote control
infrared remote
led
mcu chip
button
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Pending
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CN2013100367533A
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Chinese (zh)
Inventor
苏龙健
郑灼荣
何凯帆
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Jianrong Integrated Circuit Technology Zhuhai Co Ltd
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Jianrong Integrated Circuit Technology Zhuhai Co Ltd
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Priority to CN2013100367533A priority Critical patent/CN103135054A/en
Publication of CN103135054A publication Critical patent/CN103135054A/en
Pending legal-status Critical Current

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Abstract

The invention discloses and provides a press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and an integration achieving method. The press key detection circuit integrating LED driving and the infrared remote control receiving function comprises a press key resistance network (1), a microprogrammed control unit (MCU) chip (2), a sharing upward pull-up resistor (3), a LED driving circuit (4) and an infrared remote control receiving circuit (5). One end of the sharing upward pull electric resistance (3) is connected with a power supply. The other end of the sharing upward pull electric resistance (3) is in common ground after the sharing upward pull electric resistance (3) is in series connection with the press key electric resistance network (1). The LED driving circuit (4) is in parallel connection with the sharing upward pull electric resistance (3). A node connected by the sharing upward pull electric resistance (3) and the press key electric resistance network (1) is connected with a pin of the MCU chip. The infrared remote control receiving circuit (5) is in parallel connection with the press key electric resistance network (1). The integration achieving method comprises a press key detection step, an LED display driving step and an infrared remote control receiving signal decoding step. The press key detection circuit integrating LED driving and the infrared remote control receiving function and the integration achieving method can be used in the field of the press key detection.

Description

A kind of key press detecting circuit and integration implementation method of integrating LED driving and infrared remote control receiving function
Technical field
The present invention relates to a kind of key press detecting circuit, relate in particular to a kind of LED that integrated and drive and the key press detecting circuit of infrared remote control receiving function and the integration implementation method of this circuit.
Background technology
The realizing method that button detects has a lot, and in consumer electronics product, the most frequently used is to utilize a upper drop-down resistor network and an analog to digital converter (ADC) to realize, is called for short ADKEY.
LED(Light Emitting Diode), light emitting diode, be a kind of can be the solid-state semiconductor devices of visible light with electric energy conversion, it can directly be converted into light to electricity.LED is widely used in electronic equipment, as indication and display light source.
Infrared remote control is a kind of wireless, non-contact control technology, has an antijamming capability strong, and communication is reliable, low in energy consumption, cost is low, and easily realization waits remarkable advantage, by many electronic equipments particularly household electrical appliance extensively adopt, and more and more be applied in computer system.Infrared remote control reception circuit generally is comprised of several parts such as receiving circuit, amplifying circuit, modulation circuit, instruction decoding circuits.The infrared signal that receiving circuit sends transmitter (modulated coded order signal) receives, and send demodulator circuit after amplifying, and demodulator circuit with the demodulation of modulated instruction encoding signal out namely is reduced to coded signal.Command decoder carries out the coded order signal to produce corresponding operational order after decoding.Wherein receiving circuit and amplifying circuit are combined usually, with the form appearance of infrared remote control receiver.
Button detection, LED and infrared remote control receive, and often exist simultaneously at the terminal electronic product.This three functions coordinates the MCU main control chip jointly to realize the application function of electronic product.But implementation commonly used is button detection, LED and infrared remote control reception respectively takies a MCU IO(input and output pin).It is very restricted when the very limited MCU of IO number coordinates.Be unfavorable for reducing cost of products.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, providing a kind of has integrated the key press detecting circuit of LED driving and infrared remote control receiving function and has integrated realizing method, this circuit and way only need a MCU pin, just can realize that LED drives, infrared remote control receives and the button measuring ability, greatly reduce the cost of product.
the technical scheme that the key press detecting circuit of a kind of LED of integration driving of the present invention and infrared remote control receiving function adopts is: described key press detecting circuit comprises button resistor network and MCU chip, described key press detecting circuit also comprises shared pull-up resistor, LED drive circuit and infrared remote control reception circuit, described shared pull-up resistor one termination power, the other end with after described button resistor network is connected altogether, described LED drive circuit is in parallel with described shared pull-up resistor, the node that described shared pull-up resistor is connected with described button resistor network is connected with a pin of described MCU chip, described infrared remote control reception circuit is in parallel with described button resistor network.
Described LED drive circuit is in series by restrictor and LED, and described restrictor is connected with the dividing potential drop diode by current-limiting resistance or current-limiting resistance and consisted of.
Described infrared remote control reception circuit is composed in series by build-out resistor and infrared remote control receiver.
Described MCU chip comprises ADC and voltage shaping circuit, and described ADC and described voltage shaping circuit all are connected with pin on described MCU chip, and this pin is connected with described button resistor network.
Described button resistor network is connected respectively by several buttons and is formed in parallel after a divider resistance.
The technical scheme that the integration implementation method of the key press detecting circuit of a kind of LED of integration driving of the present invention and infrared remote control receiving function adopts is: the method comprises that button detecting step, LED display driver step and infrared remote control receive the signal decoding step.
The process of described button detecting step is as follows:
(1) the MCU chip pin that is connected with described button resistor network is set to input state;
(2) when having button to press, by described shared pull-up resistor and button build-out resistor, form direct current channel between VDD-to-VSS, produce corresponding electric resistance partial pressure level on the MCU chip pin;
(3) described MCU chip by described ADC, is changed out the digital signal of described MCU chip pin level;
(4) digital signal of described MCU chip by changing out, draw the state that corresponding button is pressed;
The process of described LED display driver step is as follows:
(1) the MCU chip pin that is connected with described LED drive circuit is set to output state;
(2) by described MCU chip pin output low level;
(3) described LED realizes work by the DC channel between power supply and described MCU pin low level;
The process that described infrared remote control receives the signal decoding step is as follows:
(1) the MCU chip pin that is connected with described button resistor network 1 is set to input state;
When (2) described infrared remote control receiver is received infrared signal, by described shared pull-up resistor and described current-limiting resistance, between VDD-to-VSS, connect or disconnect DC channel, the logical signal waveform of generation rule on described MCU chip pin;
(3) described MCU chip utilizes described logical signal, draws the infrared remote-control operation code, and implements corresponding operation.
Described infrared remote control receives the signal decoding step and also comprises logical signal wave shaping step, and the voltage shaping circuit in described MCU chip is the standard logic signal waveform with the non-standard logical signal wave shaping on the MCU chip pin.
In above-mentioned steps, described power supply is the 3.3V direct supply.
the invention has the beneficial effects as follows: because described key press detecting circuit comprises button resistor network and MCU chip, described key press detecting circuit also comprises shared pull-up resistor, LED drive circuit and infrared remote control reception circuit, described shared pull-up resistor one termination power, the other end with after described button resistor network is connected altogether, described LED drive circuit is in parallel with described shared pull-up resistor, the node that described shared pull-up resistor is connected with described button resistor network is connected with a pin of described MCU chip, described infrared remote control reception circuit is in parallel with described button resistor network, so, by on the same pin on described MCU chip, described LED drive circuit being set, described button resistor network and described infrared remote control reception circuit, compare with the mode that existing each function all needs to be connected a pin of MCU chip, reduced widely the use of pin, reduced the cost of manufacture of product, the present invention realizes utilizing a MCU chip pin, realize that button detects, LED drives and infrared remote control input three functions, reduce cost of products when not affecting MCU main control chip application function.
The integration implementation method that key press detecting circuit in the present invention is integrated LED driving and infrared remote control receiving function need not to introduce more module, do not need to write complicated program yet and get final product practical function, relative reduce staff's working strength, reduced simultaneously cost.
Description of drawings
Fig. 1 is easy structure schematic diagram of the present invention;
Fig. 2 is the workflow diagram of the inventive method;
Fig. 3 is that in the present invention, infrared remote control receives the front waveform schematic diagram of signal shaping;
Fig. 4 is the waveform schematic diagram after infrared remote control reception signal shaping in the present invention.
Embodiment
As shown in Figure 1, the present embodiment provides the key press detecting circuit of a kind of LED of integration driving and infrared remote control receiving function.This circuit comprises button resistor network 1 and MCU chip 2, described key press detecting circuit also comprises shared pull-up resistor 3, LED drive circuit 4 and infrared remote control reception circuit 5, described shared pull-up resistor 3 one termination powers, the other end with after described button resistor network 1 is connected altogether, described LED drive circuit 4 is in parallel with described shared pull-up resistor 3, the node that described shared pull-up resistor 3 is connected with described button resistor network 1 is connected with a pin of described MCU chip 2, and described infrared remote control reception circuit 5 is in parallel with described button resistor network 1.Described LED drive circuit 4 is connected with the parallel circuit that described button resistor network 1 forms with parallel circuit and described infrared remote control reception circuit 5 that described shared pull-up resistor 3 forms, setting Vi is the node voltage between these two parallel circuits, and Vi is connected with the pin of described MCU chip.
Described LED drive circuit 4 is in series by restrictor 41 and LED, and described restrictor 41 is connected with the dividing potential drop diode by current-limiting resistance or current-limiting resistance and consisted of.Described infrared remote control reception circuit 5 is composed in series by build-out resistor R8 and infrared remote control receiver.Described MCU chip 2 comprises ADC and voltage shaping circuit 21, and described ADC and described voltage shaping circuit 21 all are connected with pin on described MCU chip 2, and this pin is connected with described button resistor network 1.Described button resistor network 1 is connected respectively by several buttons and is formed in parallel after a divider resistance.
The integration implementation method of described key press detecting circuit comprises that button detecting step, LED display driver step and infrared remote control receive the signal decoding step.
The process of described button detecting step is as follows:
(1) the MCU chip pin that is connected with described button resistor network 1 is set to input state;
(2) when having button to press, by described shared pull-up resistor 3 and button build-out resistor, form direct current channel between VDD-to-VSS, produce corresponding electric resistance partial pressure level on the MCU chip pin;
(3) described MCU chip 2 by described ADC, is changed out the digital signal of described MCU chip pin level;
(4) digital signal of described MCU chip by changing out, draw the state that corresponding button is pressed;
The process of described LED display driver step is as follows:
(1) the MCU chip pin that is connected with described LED drive circuit is set to output state;
(2) by described MCU chip pin output low level;
(3) described LED realizes work by the DC channel between power supply and described MCU pin low level;
The process that described infrared remote control receives the signal decoding step is as follows:
(1) the MCU chip pin that is connected with described button resistor network 1 is set to input state;
When (2) described infrared remote control receiver is received infrared signal, by described shared pull-up resistor and described current-limiting resistance, between VDD-to-VSS, connect or disconnect DC channel, the logical signal waveform of generation rule on described MCU chip pin;
(3) described MCU chip utilizes described logical signal, draws the infrared remote-control operation code, and implements corresponding operation.
Described infrared remote control receives the signal decoding step and also comprises logical signal wave shaping step, and the voltage shaping circuit in described MCU chip is the standard logic signal waveform with the non-standard logical signal wave shaping on the MCU chip pin.
Described power supply is the 3.3V direct supply.
Process flow diagram as shown in Figure 2, timesharing realize that button detects, LED drives and the infrared remote control receiving function.
The button measuring ability by shared pull-up resistor RC and the series connection of button resistor network, coordinates the ADC of MCU chip to realize.When pressing without button, there is no DC channel, MCU chip pin level Vi=3.3V.When a button is pressed, at power vd D(3.3V) and GND between form DC channel, by the DC channel dividing potential drop that has a resistance, Vi voltage changes.As shown in Figure 1, when button S0 was pressed, the R0 dividing potential drop produced test voltage Vi=V0.As S1, S2, S3 ... when the Sn button is pressed respectively, produce separately test voltage V1, V2, V3 ... Vn.The resistance of R0 in Fig. 1, R1, R2, R3, Rn is different, and V0 is just not identical to the magnitude of voltage of Vn.In like manner, when a plurality of buttons made up conducting simultaneously, the dividing potential drop of generation was also different.Vi is input to by the pin of MCU chip the ADC that is communicated with the pin of MCU chip.The MCU chip detects the variation of Vi voltage by ADC, the situation that the judgement button is pressed.
LED drives function, is comprised of restrictor and LED.When needing LED to light, the IO of MCU chip is set to low level output, and restrictor and LED form the conducting loop between 3.3V and GND.The value of Rational choice current-limiting resistance RL just has enough drive currents to light LED in the loop.When needing LED to close, only need IO to be set to input state, cut off the conducting loop of LED drive circuit.Because the current-limiting resistance of button Sampling network, Infrared remote controller receiving circuit and the metering function of restrictor, even have button to press or Infrared remote controller receives signal, allow LED obtain the conducting loop, LED can be not luminous because drive current is not enough yet.In restrictor, the number of the size of current-limiting resistance RL, series diode need to be according to the circuit computing of reality.
The infrared remote control receiving function is composed in series by build-out resistor and infrared remote control receiver, and infrared remote control reception circuit is in parallel with each button path in the button resistor network.Infrared remote control receiver is not when receiving signal, and its IRDA pin output 3.3V does not have pressure drop between shared pull-up resistor RC and build-out resistor R8, and MCU chip pin voltage is logic high 3.3V; When infrared remote control receiver had the signal of reception, the IRDA pin was connected to GND by infrared remote control receiver internal resistance RA.Described infrared remote control receiver internal resistance RA, build-out resistor R8, share pull-up resistor RC, the inner current-limiting resistance RL of restrictor and LED form the conducting loop between 3.3V and GND, thereby obtain voltage Vi=V8 on the MCU chip pin.Because of electric resistance partial pressure, V8 is not the logic input voltage of a standard.Use for convenient, the voltage shaping circuit of MCU inside is shaped as the standard logic low level signal with the non-standard logical signal Vi on the MCU pin, as shown in Figure 3, Figure 4.The program of MCU chip detects the infrared remote control control signal according to orthopedic logic level signal sequence.
The present invention shares the method for a MCU pin as example take LED driving, infrared remote control receiving function, key circuit testing circuit; comprise the method that any two functions combination shares a MCU pin; above-mentioned implementation column only is explanation design of the present invention and characteristics; can not limit protection scope of the present invention with this; all equivalences that essence is done according to the present invention change or modify, within should being included in the protection domain of patent of the present invention.
The present invention can be applicable to the button detection field.

Claims (8)

1. integrate that LED drives and the key press detecting circuit of infrared remote control receiving function for one kind, comprise button resistor network (1) and MCU chip (2), it is characterized in that: described a kind of LED of integration drives and the key press detecting circuit of infrared remote control receiving function also comprises shared pull-up resistor (3), LED drive circuit (4) and infrared remote control reception circuit (5), described shared pull-up resistor (3) one termination powers, the other end with after described button resistor network (1) is connected altogether, described LED drive circuit (4) is in parallel with described shared pull-up resistor (3), the node that described shared pull-up resistor (3) is connected with described button resistor network (1) is connected with a pin of described MCU chip (2), described infrared remote control reception circuit (5) is in parallel with described button resistor network (1).
2. according to claim 1ly a kind ofly integrate that LED drives and the key press detecting circuit of infrared remote control receiving function, it is characterized in that: described LED drive circuit (4) is in series by restrictor (41) and LED, and described restrictor (41) is connected with the dividing potential drop diode by current-limiting resistance or current-limiting resistance and consisted of.
3. according to claim 1ly a kind ofly integrate that LED drives and the key press detecting circuit of infrared remote control receiving function, it is characterized in that: described infrared remote control reception circuit (5) is composed in series by build-out resistor (R8) and infrared remote control receiver.
4. according to claim 1ly a kind ofly integrate that LED drives and the key press detecting circuit of infrared remote control receiving function, it is characterized in that: described MCU chip (2) comprises ADC and voltage shaping circuit (21), described ADC and described voltage shaping circuit (21) all are connected with pin on described MCU chip (2), and this pin is connected with described button resistor network (1).
5. any one describedly a kind ofly integrates that LED drives and the key press detecting circuit of infrared remote control receiving function according to claim 1 to 4, it is characterized in that: described button resistor network (1) is connected respectively by several buttons and is formed in parallel after a divider resistance.
6. as claimed in claim 5ly a kind ofly integrate that LED drives and the integration implementation method of the key press detecting circuit of infrared remote control receiving function for one kind, it is characterized in that, it comprises that button detecting step, LED display driver step and infrared remote control receive the signal decoding step, and the process of described button detecting step is as follows:
(1) the MCU chip pin that is connected with described button resistor network (1) is set to input state;
(2) when having button to press, by described shared pull-up resistor (3) and button build-out resistor, form direct current channel between VDD-to-VSS, produce corresponding electric resistance partial pressure level on the MCU chip pin;
(3) described MCU chip (2) by described ADC, is changed out the digital signal of described MCU chip pin level;
(4) digital signal of described MCU chip by changing out, draw the state that corresponding button is pressed;
The process of described LED display driver step is as follows:
(1) the MCU chip pin that is connected with described LED drive circuit is set to output state;
(2) by described MCU chip pin output low level;
(3) described LED realizes work by the DC channel between power supply and described MCU pin low level;
The process that described infrared remote control receives the signal decoding step is as follows:
(1) the MCU chip pin that is connected with described button resistor network (1) is set to input state;
When (2) described infrared remote control receiver is received infrared signal, by described shared pull-up resistor and described current-limiting resistance, between VDD-to-VSS, connect or disconnect DC channel, the logical signal waveform of generation rule on described MCU chip pin;
(3) described MCU chip utilizes described logical signal, draws the infrared remote-control operation code, and implements corresponding operation.
7. according to claim 6ly a kind ofly integrate that LED drives and the integration implementation method of the key press detecting circuit of infrared remote control receiving function, it is characterized in that, described infrared remote control receives the signal decoding step and also comprises logical signal wave shaping step, and the voltage shaping circuit in described MCU chip is the standard logic signal waveform with the non-standard logical signal wave shaping on the MCU chip pin.
8. according to claim 6ly a kind ofly integrate that LED drives and the integration implementation method of the key press detecting circuit of infrared remote control receiving function, it is characterized in that: described power supply is the 3.3V direct supply.
CN2013100367533A 2013-01-31 2013-01-31 Press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and integration achieving method Pending CN103135054A (en)

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Application publication date: 20130605