红外遥控芯片外文文献.pdf

Infrared Remote And Chips Are Introduced People s eyes can see the visible wavelength fromlongto short according to the arrangement in order to red orange yellow green green blue violet One of the red wavelengths for 0 62 0 76 muon m Purpleis0 38 wavelength range muonm Purpleisshorter than the wavelength of light called ultravioletray red wavelengths of lightislonger than that of infrared light Infrared remote controlisto use wavelength for 0 76 1 5 muon m between the near infrared to transfer control signal Commonly used infrared remote control systemofgeneral points transmit and receive two parts The main component part for the launch of infrared light emitting diode Itisactually a special light emitting diode due to its internal material differs from ordinary light emitting diode resulting in its ends on certain voltage itisa rather infrared light Use of infrared light emitting diode the infrared wavelengths for 940nm appearance and ordinary just the same light emitting diode five different colors Infrared light emitting diode generally have black and blue transparent three colors Judgementofinfrared light emitting diode and judgment method using a multimeter to ordinary diode electric block measure of infrared light emitting diode reverse resistance The infrared light emitting diode luminescence efficiency touse special instrument to measure precise anduseonlyspare conditions topullaway from roughly judgement Receiving part of infrared receiving tubeisa photosensitive diode In actual applicationofirreceiving diode to reverse bias itcan work normally i e the infrared receiving circuit application in diodeisused to reverse higher sensitivity Infrared receiving diode usually have two round and rectangular Due to the powerofinfrared light emitting diode or less commonly 100mW soirreceiving diode received signalsisweak sowillincrease high gain ones the amplifier circuit In common CX20106A etc PC1373H muon infrared receiving special amplifier circuit In recent years both amateur or formal products mostly using infrared receiving head finished The headofinfrared receiving product packages generally has two kinds one kind USES sheet shielding A kind of plastic packaging There are three pin namely the poweris VDD power negative GND and data output VO or OUT Infrared receiving head foot arrangement for types varied manufacturer s instructions Finished the advantages of infrared receiving headisnot in need of sophisticated debugging and shell screen use rise as a transistor very convenient But when used in the infrared receiving attention finished first carrier frequency Infrared remote common carrier frequency for 38kHz thisistransmittedby using 455kHz TaoZhen to decide Atthe launch of crystals were integer frequency frequency coefficients so commonly 12 so 455kHz 12 hundredth kHz 38kHz hundredth 379 000 Some remote control system adopts 36kHz 56kHz etc general 40kHz launched by the crystals of oscillation frequency to decide Infrared remote characteristicisnotinfluence the surrounding environment and does not interfere with other electric equipment Due toitscannot penetrate walls so the roomcanuse common household appliance of remote control without mutual interference Circuit testingissimple as long as given circuit connection generally does not need any commissioning can work Decodingeasily can undertake multiple remote control Because each manufacturer produces a great deal of infrared remote application specific integrated circuit when need press diagramsuoji Therefore the infrared remote now in household appliances indoor close less than 10 meters in the remote controliswidely used Multiple infrared remote control system of infrared emission control buttons there are many parts general representative of different control function When pressed a button correspondingly in the receiver with different output Receiving the output state can be roughly divided into pulse level self locking and interlock data five forms The pulse outputisaccording to launch when the button the receiver output terminals output corresponding effective a pulse width 100ms in general Level refers to the output launch press button the receiver output corresponding output level effective transmit to loosen the receiver level disappears This effective pulse and effective may be of high levelislow and may also dependonthe output corresponding static state such as feet for low static high for effective As for the static low high effective In most cases high for effective Since the lock refers to launch the output of each time you press the button a receiver output corresponding change namely originally a state for high level into a low level originally for low level intohighlevel The output power switch and mute as control etc Sometimes also called the output form for invert The interlock refers to multiple outputs each output at the same timeonlyone output TheTVsets of this caseisselected the otherislike the light and sound input speed etc Data refers to launch the output some key use a few output form a binary number to represent different keystroke Normally the receiver except a few data output but also a valid output data so the timely to collect data This output form with single chip microcomputer or are commonly used interface In addition to the above output form outside still have a latch and temporary two forms The so called latch refers to launch the output signal of eachhair the receiver output corresponding new storeuntilyou receive signals Temporary output and the introduction of level outputissimilar Remote distance Remote Control effect of RF Remote Control distance are the major factors as follows 1 launched in power transmission power while distance butgreat power consumption easy to generate interference 2 and receiving the receiver sensitivity receiving remote distance increased sensitivity to improve buteasy to cause disturbance maloperation or abuse 3 antenna using linear antenna and parallel remote distance but occupies a large space inusethe antenna spin pullcan increase the remote distance 4 and the higher height antenna remote farther butbyobjective conditions 5 and stop current useofwireless remote use of UHF band stipulated by the state the propagation characteristics of approximate linear transmission light small transmitters and receivers diffraction between such as walls are blockingwillgreatly discounted remote distance ifisreinforced concrete walls due to the absorption effect conductor radio waves Considering the design of hardware volume small to be embedded in the remote control so we chose 20 foot single chip chip AT89C2051 Belowisthe introduction of the function 1 AT89C2051 internal structure and performance AT89C2051isa byte flash 2K with programmable read only memory can be erased EEPROM low voltage highperformance of eight CMOS microcomputer It adoptsATMELof high density non volatile storage technology manufacturing and industrial standard MCS 51 instruction set and lead Through the combination of single chip in general CPL1 and flash memory isa strongATMELAT89C2051 microcomputer itsapplication in many embedded control provides a highly flexible and low cost solutions The compatible with 8051 AT89C2051isCHMOS micro controller the Flash memory capacity for 2KB And CHMOS 80C51 process have two kindsofleisure and power saving operation mode The performanceisas follows 8 CUP 2KB Flash memory Working voltage range 2 7 6V 128KB data storage The static working way 0 24MHz 15 root input output line A programmable serial 2 a 16 bit timing counters Thereisa slice of inside precision simulation comparator 5 the interrupt sources 2 priority Programmable serial UART channel Directly LED driver output The internal structureofAT89C2051isshown in figure 1 Figure 1AT89C2051 interior structure 2 AT89C2051 chip pin and function In order to adapt to the requirement of intelligent instrument embedded in the chip foot AT89C2051 simplified configuration as shown in figure b The major changesto 1 the lead foot from 20 to 40 wires 2 increased a simulated comparator 1 2 3 4 5 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 89C2051 RST VPP RXD P3 0 TXD P3 1 XTAL2 XTAL1 INT0 P3 2 INT1 P3 3 T0 P3 4 T1 P3 5 GND VCC P1 7 P1 6 P1 5 P1 4 P1 3 P1 2 P1 1 AIN1 P1 0 AIN0 P3 7 Diagram b AT89C2051 foot figure AT89C2051 pin function 1 the Vcc voltage 2 to GND 3 P1 mouth P1 mouthisan 8 bit two way I O port P1 2 P1 7 mouth pin the internal resistance provides P1 0 and P1 1 requirements on the external pull up resistors P1 0 and P1 1 alsoseparatelyas piece inside precision simulation comparator with input AIN0 and reversed phase input AIN1 Output buffer can absorb the P1 mouth 20mA current and can directly LED display driver When P1 mouth pin into a 1 can make its input When thepinP1 2 P1 7 as input and external down theywillbe for the internal resistance and flow current IIL Inflash P1 mouth during the procedure and program code data receiving calibration 4P3 the P3 0 P3 5 P3 P3 7isthe internal resistance with seven two wayI 0 lead P3 6 for fixed inputs piece inside the comparator output signal anditas a general I O foot and inaccessible P3 mouth buffer can absorb 20mA current When P3 mouth pin into 1 they are the internal resistance can push and input As input and the low external P3 mouth pin pull up resistors andwilluse current IIL outflow P3 mouth still used to implement the various functions such as AT89C2051 shown in table 1 P3 mouthstillreceive some for flash memory programming and calibration of program control signals 5RST reset input RST once allinto high level I O footwillreset to 1 When the oscillatorisrunning continuous gives RST pin two machine cycle of high level can finish reset Each machine cycle to 12 oscillator or clock cycle 6 XTAL1 as the oscillator amplifier input and inverse internal clock generator input 7 XTAL2 as the oscillator reversed phase the amplifier s output P3 mouth function asisshown in table 1 Table 1 P3 mouthpinFunction P3 0RXD Serial input P3 1TXD Serial output port P3 2INT0 External interruption 0 P3 3INT1 External interruption 1 P3 4TO The timer 0 external input P3 5T1 The timer 1 external input 3 the software and hardware constraints AT89C2051 Due to the foot of the chip AT89C2051 no set limits of external storage interface so for external memory read write instructions as MOVX etc Due to 2KB ROM so the space to jump instruction should pay attention to the destination address range transfer 000H 7FFH beyond the range of addresses will not meet wrong results The scopeofdata storageis00H 7FH when stack manipulation also should be noticed The input signalissimulatedbythe original P3 6 foot into the microcontroller so the original P3 6foot Unable to external use Simulation comparator can compare two simulation if the size of the voltage external A D A converter and its output as A comparator analog input andbysimulating the comparator another input voltage to be measured through the introduction of the software method can realize the A D conversion 4 the Flash memory AT89C2051 Provide a 2KB of single chip AT89C2051 in Flash memory chips which allows the online program to modify or use special programming programming A Flash memory encryption AT89C2051 SCM has 2 encryption canprogramming P or programming U to obtain different encryption functionality Encryption functionality table as shown in table 1 1 Table 1 1 LB1LB2Encryption functionality UUNo encryption functionality PUProhibit to flash to programming PPProhibit to flash to programming Also banned program Encrypt a content erasedonlythrough chips to erase operation B Flash memory programming and procedures 1 the piece inside chip AT89C2051 Flash memory programming model as shown in table 1 2 Table 1 2 AT89C2051 microcontroller programming model ModeRESETP3 2 PROGP3 3P3 4P3 5P3 7 Write code data12VLHHH Read code dataHHLLHH Write code data LB1 Write code data LB2 12VHHHH 12VHHLL Chip erased12VHLLL Read the signal bytesHHLLLL Note 1 the counters RESET atanEPROM inside the rising edge and 000H RESET to XTAL1 by footisexecuted pulse count 2 piecesof10ms to erase PROG pulse 3 during the programming P3 1 pulled low RDY BSY instructions C AT89C2051 SCM in Flash memory chips programming steps are as follows 1 in the sequenceisthe VCC GND pin add working voltage XTAL1 pin RESET receiving GND pin other than the above time waiting for 10ms 2 In P3 2 pin RESET heightening level 3 In P3 3 P3 4 P3 5 P3 7 pin add model multilevel 4 P1 0 P1 7 for the 000H unit add data bytes 5 RESET to increase the 12V activation programming 6 P3 2 jump to a one byte programming or encryption 7 calibrationhasbeen programming data from 12V to RESET logic level H and set P3 3 P3 7 for the correct level and can output data in P1 mouth 8 For the next addresses in the unit XTAL1 byte programming a pulse make address counter add 1 in mouth add programming data P1 Repeat step 1 8complete the whole 2KB programming ElectricityisXTAL1 Settings in order to L RESET and float empty other I O foot close the VCC power 3 programming and calibration circuit figure c d Figure c programming circuitFigure d calibration circuit Explanation 1 P3 1 during programming instructions to be low RDY BSY 2 single erasing the PROG 10ms need 3 internal EEPROM address counter on the rising edge RESET and 000H RESET to XTAL1byfoot pulses are executed Along with the rapid development of science and technology human society has undergone earth shaking changes Make our life more colorful In these changes the remote control technology has been widely permeatesTV aerospace military sports and other production allaspects of life From the broad sense allequippedwith electric locInfrared Remote And Chips AreIntroduced People s eyes can see the visible wavelength fromlongto short according to the arrangement in order to red orange yellow green green blue violet One of the red wavelengths for 0 62 0 76 muon m Purpleis0 38 wavelength range muonm Purpleisshorter than the wavelength of light called ultravioletray red wavelengths of lightislonger than that of infrared light Infrared remote controlisto use wavelength for 0 76 1 5 muon m between the near infrared to transfer control signal Commonly used infrared remote control systemofgeneral points transmit and receive two parts The main component part for the launch of infrared light emitting diode Itisactually a special light emitting diode due to its internal material differs from ordinary light emitting diode resulting in its ends on certain voltage itisa rather infrared light Use of infrared light emitting diode the infrared wavelengths for 940nm appearance and ordinary just the same light emitting diode five different colors Infrared light emitting diode generally have black and blue transparent three colors Judgementofinfrared light emitting diode and judgment method using a multimeter to ordinary diode electric block measure of infrared light emitting diode reverse resistance The infrared light emitting diode luminescence efficiency touse special instrument to measure precise anduseonlyspare conditions topullaway from roughly judgement Receiving part of infrared receiving tubeisa photosensitive diode In actual applicationofirreceiving diode to reverse bias itcan work normally i e the infrared receiving circuit application in diodeisused to reverse higher sensitivity Infrared receiving diode usually have two round and rectangular Due to the powerofinfrared light emitting diode or less commonly 100mW soirreceiving diode received signalsisweak sowillincrease high gain ones the amplifier circuit In common CX20106A etc PC1373H muon infrared receiving special amplifier circuit In recent years both amateur or formal products mostly using infrared receiving head finished The headofinfrared receiving product packages generally has two kinds one kind USES sheet shielding A kind of plastic packaging There are three pin namely the poweris VDD power negative GND and data output VO or OUT Infrared receiving head foot arrangement for types varied manufacturer s instructions Finished the advantages of infrared receiving headisnot in need of sophisticated debugging and shell screen use rise as a transistor very convenient But when used in the infrared receiving attention finished first carrier frequency Infrared remote common carrier frequency for 38kHz thisistransmittedby using 455kHz TaoZhen to decide Atthe launch of crystals were integer frequency frequency coefficients so commonly 12 so 455kHz 12 hundredth kHz 38kHz hundredth 379 000 Some remote control system adopts 36kHz 56kHz etc general 40kHz launched by the crystals of oscillation frequency to decide Infrared remote characteristicisnotinfluence the surrounding environment and does not interfere with other electric equipment Due toitscannot penetrate walls so the roomcanuse common household appliance of remote control without mutual interference Circuit testingissimple as long as given circuit connection generally does not need any commissioning can work Decodingeasily can undertake multiple remote control Because each manufacturer produces a great deal of infrared remote application specific integrated circuit when need press diagramsuoji Therefore the infrared remote now in household appliances indoor close less than 10 meters in the remote controliswidely used Multiple infrared remote control system of infrared emission control buttons there are many parts general representative of different control function When pressed a button correspondingly in the receiver with different output Receiving the output state can be roughly divided into pulse level self locking and interlock data five forms The pulse outputisaccording to launch when the button the receiver output terminals output corresponding effective a pulse width 100ms in general Level refers to the output launch press button the receiver output corresponding output level effective transmit to loosen the receiver level disappears T