CN104698910A - Touch key and LED display drive IC (integrated circuit) - Google Patents
Touch key and LED display drive IC (integrated circuit) Download PDFInfo
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- CN104698910A CN104698910A CN201310664810.2A CN201310664810A CN104698910A CN 104698910 A CN104698910 A CN 104698910A CN 201310664810 A CN201310664810 A CN 201310664810A CN 104698910 A CN104698910 A CN 104698910A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
The invention discloses a touch key and LED display drive IC (integrated circuit), characterized by integrating a touch key and an LED display drive; more importantly, certain ports are optionally available for LED drive, the touch keys and even a traditional keyboard; single-port digital communication and master communication are adopted; an LED drive display synchronous port SY is provided; the touch keys or the keyboard are read through ADC regulations.
Description
Technical field
The present invention relates to electromagnetic oven and IC, single port digital communication, membrane keyboard and LED display driver IC technical field.
Background technology
Electromagnetic oven and IC thereof, known electromagentic furnace technology has 3 kinds:
1st kind, adopt as LM339 tetra-comparer IC forms oscillatory circuit, drive IGBT via transistor circuit, then by having the single-chip microcomputer sample rate current of ADC function and voltage and then rated output, while complete control by single-chip microcomputer; Above-mentioned oscillatory circuit does not say resonant circuit, reason is, the low level duration of IGBT control gate pulse is the fixing duration determined by RC delay circuit, can not change with the change of pan resonance, such IGBT is difficult to the efficiency realizing accurate voltage the lowest point switch, can reduce electric power, and the efficiency of its electric power is also the pan for joining specially;
2nd kind, there is the single-chip microcomputer of ADC function to export pulse, drive IGBT via transistor circuit, then by this single-chip microcomputer sample rate current and voltage and then rated output, complete control by single-chip microcomputer simultaneously; The low level duration of its IGBT control gate pulse is determined by mcu programming, can change with pan change, but owing to there is no the method for suitable detection resonance, the efficiency of its electric power with the 1st kind almost; Meanwhile, single-chip microcomputer is difficult to the generation avoiding deadlock phenomenon;
3rd kind, 1st kind is adopted and forms the integrated IC of circuit such as oscillatory circuit as LM339 tetra-comparer IC, IGBT is driven via transistor circuit, again by having the single-chip microcomputer sample rate current of ADC function and voltage and then rated output, complete control by single-chip microcomputer simultaneously, program existing market is very little, and reason does not have large progress than the 1st kind of scheme, and use cost does not decline simultaneously.
Current electromagnetic oven scheme is still very complicated, and single-chip microcomputer must have ADC function, needs multiply [generally having more than 9 strands] connecting line, do not have resonance to control simultaneously between electromagnetic oven power plate and display board; Meanwhile, known electromagnetic oven stand-by power consumption best level is 1W.
Electromagnetic oven IC or other application IC, need a kind of digital communication system, complete control system IC[as application system intelligent IC such as electromagnetic oven control single chip computers] and application operating IC[as electromagnetic oven IC, membrane keyboard and LED display driver IC etc.] between communication; Known definition, control system IC is main frame, and application operating IC is from machine.
Port the present invention that main frame is used for digital communication is called for short host port; Main frame is generally able to programme, and as single-chip microcomputer, the digital IO mouth of most of single-chip microcomputer can use as host port; For single chip application, host port must be the port for digital communication, and the present invention of other port is not called host port, other port or be called main frame mouth.
The port the present invention being used for digital communication from machine is called for short from machine port; From machine as IC such as LED display driver, ADC, membrane keyboards, this port known is general and single-chip microcomputer digital IO mouth is similar; From the port that machine port must be for digital communication, the present invention of other port is not called from machine port, other port or be called from machine mouth.
Host port with from machine port, be referred to as communication port.
Known communication port, adopts O level and VDD level to represent output 0 and 1.
Main frame communicates with can adopt single port digital communication, Two-port netwerk digital communication or multiple port number from machine digital communication.
Known single port digital communication has asynchronous digital communication port; Main frame employing asynchronous communication mouth should be more convenient, but adopted the design of asynchronous communication mouth with regard to more complicated from machine; Ridge this, known technology particularly IC communication port does not adopt single port digital communication, but adopt as I2C communication port, is at least generally Two-port netwerk digital communication, instead of single port digital communication.
Electromagnetic oven or miscellaneous equipment, its display tablet [abbreviation display board], known, be there is no membrane keyboard and LED display driver IC, but have membrane keyboard IC and LED display driver IC respectively, and these two kinds of IC generally adopt as the digital communication of I2C Two-port netwerk; In order to reduce costs, display board is generally individual layer pcb board, and adopt membrane keyboard IC and LED display driver IC to there will be two or more wiring centers, wiring intersects many, adds wiring complexity, and needs many cross-lines, turn increase production work amount.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, single port digital communication, membrane keyboard and LED display driver IC, electromagnetic oven and IC thereof are proposed, compared with prior art, there is the features such as peripheral cell is less, production is simple, cost is lower, stand-by power consumption is lower.
The technical scheme realizing above-mentioned purpose is:
Single port digital communication of the present invention, is characterized in that, from the compatible host port output current of machine port output current ability.
The above-mentioned single port digital communication of the present invention, is characterized in that, from the compatible host port incoming level of machine port 0 and 1 output level, conveniently can judge that host port exports 0, exports 1 or high resistant from machine simultaneously.
Single port digital communication of the present invention, is characterized in that, only has the compatible host port incoming level of 0 output level from machine port, meanwhile, conveniently can judge that host port exports 0 and non-zero from machine.
Single port digital communication of the present invention, is characterized in that, only has the compatible host port incoming level of 1 output level from machine port, meanwhile, conveniently can judge that host port exports 1 and non-1 from machine.
Single port digital communication of the present invention, it is characterized in that, adopt ADC code, read ADC result and adopt limit conversion limit from a high position to read, before entering ADC transformation segment the inner adc data register of IC everybody all put 1, ADC transformation segment is entered at communication sequence, circulation starts, and from machine by present bit=0, exports analog quantity and the measured result compared from machine, if analog quantity is less than measured, main frame is put from machine present bit=1, continues next bit cycling until ADC converts.
Membrane keyboard of the present invention and LED display driver IC, it is characterized in that, in one piece of IC, be integrated with membrane keyboard and LED display driver two kinds of functions, the more important thing is that some ports of this IC can be selected driving LED, also can select membrane keyboard or even traditional keyboard.
Membrane keyboard of the present invention and LED display driver IC, is characterized in that, adopts single port digital communication technology of the present invention.
Membrane keyboard of the present invention and LED display driver IC, is characterized in that, has driving LED to show synchronous mouth SY.
Membrane keyboard of the present invention and LED display driver IC, is characterized in that, adopts ADC code to read membrane keyboard or keyboard.
Electromagnetic oven IC of the present invention, is characterized in that, there is self-adapting resonance circuit inside.
The above-mentioned electromagnetic oven IC of the present invention, it is characterized in that, there is power calculation multiplier circuit inside.
The above-mentioned electromagnetic oven IC of the present invention, is characterized in that, adopts single port digital communication technology to communicate with main control singlechip.
The above-mentioned electromagnetic oven IC of the present invention, is characterized in that, inside is provided with the analog quantitys such as adc circuit sampling electromagnetic oven power input, IGBT temperature, cooking bottom temperature.
The above-mentioned electromagnetic oven IC of the present invention, is characterized in that, inside is provided with a DAC-circuit and exports electromagnetic oven power control signal.
Electromagnetic oven of the present invention, there are display board and power amplifier board in inside, it is characterized in that, power amplifier board adopts above-mentioned electromagnetic oven IC.
The above-mentioned electromagnetic oven of the present invention, is characterized in that, display board and power amplifier board adopt 3 lines to be connected.
The above-mentioned electromagnetic oven of the present invention, is characterized in that, adopts inventive touch key and LED display driver IC on the display panel.
Accompanying drawing explanation
Fig. 1, the present invention's non-limiting single port digital communication exemplary waveforms figure.
Fig. 2, the preferred non-limiting electromagnetic oven scheme of the present invention.
Fig. 3, the non-limiting membrane keyboard of the present invention and LED display driver IC application schematic diagram [Fig. 2 local].
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 2, be the embodiment of concrete manifestation single port digital communication of the present invention on electromagnetic oven, single-chip microcomputer is communicated with an electromagnetic oven IC with LED display driver IC with 2 membrane keyboards respectively by 3 host ports; Fig. 1 represents non-limiting single port digital communication exemplary waveforms figure.Adopt single port digital communication effectively can reduce host port number and from machine port number, and then reduce main frame IC and encapsulate scale from machine IC, reduce packaging cost, also make pcb board simultaneously and connect to simplify, reduce production cost further.
Host port incoming level of today is less than 0.3VDD[or is greater than 0.7VDD] time can input digital 0[or 1 reliably]; Embodiment adopts 0.2VDD[5V to power from machine port output level, 1V] representative digit 0,0.8VDD[5V power, 4V] representative digit 1, therefore, can the incoming level of compatible host port from machine port output level 0.2VDD/0.8VDD.Simultaneously, active designs is from the conditional output current ability of machine port, as maximum output current 0.2mA, minimum output current-0.2mA, like this, host port of today has sufficient ability will be drop-down close to 0V from machine port, or pull-up is close to VDD, therefore, can the output current of compatible host port from machine port output current 0.2mA/-0.2mA.Therefore, if it is anti-tampering to be less than 0.2VDD[from machine port level, actually can adopt 0.1VDD] then host port export 0, if it is anti-tampering to be greater than 0.8VDD[from machine port level, actually can adopt 0.9VDD] then host port export 1, otherwise host port high resistant [host port input state exports from machine and sets up].Like this, conveniently can judge that while output 0 or 1 host port exports 0, exports 1 or high resistant from machine port.Above-mentioned 0.2VDD/0.8VDD/0.2mA/-0.2mA can because of compatible host port electrical parameter adjusted design data, as 0.16VDD/0.84VDD/0.3mA/-0.3mA etc.
Fig. 1, upper end numeral time location or claim from machine horizontal level, horizontal level represents from machine command bit or order corresponding stored position or order other position corresponding, etc., the numeral that lower end numeral inputs from machine port;
Its communication control procedure adopted,
Host port exports 0 and adds 1 from machine horizontal level counter;
Host port high resistant then exports corresponding horizontal level numeral from machine port, optional, represents that host port can not perform this host port high resistant;
Host port exports 1 expression for the 1st time and writes 0 from machine horizontal level;
Host port high resistant then exports corresponding horizontal level numeral from machine port, optional, represents that host port can not perform this host port high resistant;
Continuous 2nd output 1 of host port represents writes 1 from machine port levels position;
Host port high resistant then exports corresponding horizontal level numeral from machine port, optional, represents that host port can not perform this host port high resistant;
Host port continuous 3rd output 1 expression sets to 0 from machine horizontal level counter;
Host port high resistant then exports corresponding horizontal level numeral from machine port, optional, represents that host port can not perform this host port high resistant;
Main frame must export 0;
Wherein, export 1 from host port the 1st time and start, select to perform according to command sequence, or turn next be horizontally disposed with operation.
Below in conjunction with Fig. 1 waveform, go on to say communication control procedure,
A horizontal level left side 0, uncertain from machine horizontal level, start host port and keep output 0, host port exports 1, writes 0 from machine historical level position, host port high resistant, from machine port export 0, host port continuous 2nd time export 1, write 1 from machine historical level position, host port high resistant, from machine port export 1, host port continuous 3rd time export 1, set to 0 from machine horizontal level counter;
A horizontal level left side 1, host port exports 0, adds 1[position=1 from machine location counter], main frame high resistant, main frame are read to put 1=0 from seat in the plane;
A horizontal level left side 2, host port exports 0, adds 1[position=2 from machine location counter], main frame high resistant, main frame are read to put 2=1 from seat in the plane;
A horizontal level left side 3, host port exports 0, adds 1[position=3 from machine location counter], if main frame high resistant, main frame are read to put 3=1[from seat in the plane in order to write 0 in position 3, this main frame high resistant can not adopt, later equivalent is no longer stated], main frame exports 1, puts 3 write 0 from seat in the plane, main frame high resistant, put 3=0 from seat in the plane, this main frame high resistant can not adopt, later equivalent is no longer stated;
A horizontal level left side 4, host port exports 0, adds 1[position=4 from machine horizontal level counter], main frame high resistant, main frame are read to put 4=0 from seat in the plane, main frame exports 1, puts 4 write 0 from seat in the plane, main frame high resistant, put 4=0 from seat in the plane, main frame is continuous exports 1 2nd time, put 4 from seat in the plane and write 1, and main frame high resistant, main frame are read to put 4=1 from seat in the plane;
A horizontal level left side 5, same with horizontal level left 4;
A horizontal level left side 6, same with horizontal level left 2;
Should be appreciated that between a horizontal level left 6-left side 9 and multiplely put read-write operation from seat in the plane, be not interpreted as left 8 operations of the left 7-of horizontal level;
A horizontal level left side 9, same with horizontal level left 3;
The horizontal level right side 0, the new read-write cycle starts.
From machine horizontal level, from 0, initiation command, some positions are generally command code, are read and write data afterwards, and this command sequence can copy known method.As can be seen from above-mentioned communication control procedure, a command sequence [is also that horizontal level counter sets to 0 by initiation command simultaneously, operation: host port exports 1 continuous 3 times], write digital 0[host port 1 time and export 1], write digital 1[host port and export 1 continuous 2 times], add 1[host port from machine horizontal level counter and export 0] 4 operation compositions, between 4 operations, numeral, i.e. host port can be exported from machine port can input numeral.If do not read, from machine store historical data, can select: [host port exports 1 continuous 2 times to initiation command; If need compatible aforementioned 4 to operate, host port exports 1 continuous 3 times, and host port is continuous exports 1 then not response for 2 times], write digital 1[main frame and export 11 time], to add 1 from machine location counter and write digital 0[main frame simultaneously and export 0] 3 operations.Can also application-specific demand be met, design the command sequence more than 4 operations, as arranged particular state, etc.
Above-mentioned single port digital communication, without the need to clock, being be different from there are known the asynchronous communication of clock, is unclocked asynchronous communication.
The duration difference that host port can also be selected to export 0 or 1 represents different operating, the duration 5uS/10uS/15uS/20uS exporting 0 as host port represent respectively write numeral 0, write numeral 1, to add 1 from machine location counter, initiation command 4 operation; As write digital 0 sequence of operation: host port export 1 or high resistant, the host port 5uS duration, the host port that export 0 export 1 or high resistant, if host port high resistant, simultaneously from machine port export numeral and simultaneously host port can input numeral, other class of operation is seemingly; It is compatible that the duration selecting host port to export 0 or 1 then exports 0 or 1 level from machine port, as long as namely export compatible level from one, machine from machine, selecting digital 0 compatibility then to export numeral 1 from machine port can be VDD, selecting digital 1 compatibility then to export numeral 0 from machine port can be 0V, but still needs from the restriction of machine port output current.But, if consider feature and the single-chip microcomputer of MOS technique, it is aforementioned more reasonable from the compatible level of machine port output height to adopt.
The duration no matter adopting host port to export 0 or 1 represents operation, or host port output 0, output 1, high resistant sequence represent operation, even other, as long as its precondition meets from the compatible host port output current of machine port output current, and from machine port adopt compatible host port incoming level export 1 or export 0 or export 0 and export 1, so, from machine port be exactly right port of the present invention.In addition, from communication port level character, except main frame exports except low and high level, also have 1 or 2 significantly from machine port output level.
Can because of the difference of application in an IC, select different communication control procedures, as in inventive touch key and LED display driver IC, read-write LED memory buffer and number storage adopt digital communication code [abbreviation communication control procedure], then adopt special communication control procedure [being called for short ADC code] to membrane keyboard conversion ADC.
ADC code, other parts compatible communication code except ADC transformation segment, reading ADC result adopts limit conversion limit from a high position to read, before entering ADC transformation segment the inner adc data register of IC everybody all put 1, ADC transformation segment is entered at communication sequence, circulation starts, from machine by [adc data register] present bit=0, [conversion of adc data register] analog quantity and the measured result compared is exported from machine, if analog quantity is less than measured, main frame is put from machine [adc data register] present bit=1, continues next bit cycling until ADC converts.It is pointed out that to accurately complete ADC conversion, needing enough durations when everybody conversion of ADC.
Fig. 3, electromagnetic stove display panel, 5 pin electromagnetic oven main control singlechips, wherein main control singlechip has 3 pin to be host port, except having 1 host port and communicating with the electromagnetic oven IC of electromagnetic oven power plate, 2 host ports are also had to communicate with LED display driver IC with 2 membrane keyboards.Below display board, 20 pin membrane keyboards and LED display driver IC are that preferably non-limiting comparison is applicable to the membrane keyboard of electromagnetic stove display panel and LED display driver IC in the present invention, and independently membrane keyboard mouth, 8 membrane keyboards and LED display driver mouth, independent LED that 4 driving forces are stronger drive mouth 4; Wherein, 4 independently membrane keyboard mouth be only applicable to membrane keyboard; 8 membrane keyboards and LED display driver mouth, can select driving LED, also can select membrane keyboard, but can not support driving LED and membrane keyboard simultaneously; Membrane keyboard is based on detection port electric capacity, and supports that driving LED needs additional more stray capacitance, unfavorable to membrane keyboard conversion, therefore, must sacrifice the driving force supporting driving LED; Therefore, for electromagnetic stove display panel, devise the independent LED driving mouth that 4 driving forces are stronger, the independent LED that just driving force is stronger drives mouth can drive more LED, and this independent LED drives mouth also can select to support driving hummer etc. certainly.Side's 16 pin membrane keyboards and LED display driver IC on the display panel, the scale of the membrane keyboard reduced and LED display driver.Owing to adopting 2 membrane keyboards and LED display driver IC on display board PCB, very simplify PCB layout, port can be selected nearby to support membrane keyboard or support LED display, minimizing cross-line more sure with known schemes, also can reduce the interference of electromagnetic oven to membrane keyboard, reduce manufacturing cost.
Fig. 3, membrane keyboard and LED display driver IC, communication port FT adopt single port digital communication; Because membrane keyboard needs detection port electric capacity, therefore also need to adopt ADC code; LED display driver generally adopts dynamic driving mode, many membrane keyboards need synchronous with LED display driver IC when driving LED shows, therefore be provided with driving LED and show synchronous mouth SY, can under the support of main control singlechip, a membrane keyboard and LED display driver IC is selected to be main synchronous SY, other membrane keyboard is from synchronous SY with LED display driver IC, main synchronous SY exports driving LED display synchronization signal, receive driving LED display synchronization signal from synchronous SY, complete dynamic driving LED display display.In addition, supporting that the mouth of membrane keyboard also can support traditional key board, keyboard can read by ADC code.
Fig. 2, power amplifier board-line voltage Vac samples, resistance R6 sampling line voltage Vac is input to electromagnetic oven IC, Vac holds inside to have a high-pressure MOS switch and an internal resistance, this high-pressure MOS switch one end is connected with R6, and the other end is connected with internal resistance, and internal resistance is connected in analog with AGND simultaneously, like this, internal resistance adopts voltage to be line voltage Vac dividing potential drop; Wherein, the effect of this high-pressure MOS switch can be closed when electromagnetic oven is standby, thus cancels the standby consumption of R6, reduces electromagnetic oven stand-by power consumption, and opens when electromagnetic oven works; Internal resistance sampled voltage may be used for: self-adapting resonance circuit, realtime power calculate, assist pan judgement, line voltage high voltage protective, electrical network surge protection etc.Wherein, electrical network surge protection, adopts one [can filter fast electrical network surge] to follow the tracks of Vac circuit at a slow speed, if Vac is greater than follow the tracks of at a slow speed Vac circuit output+definite value, then thinks that electrical network surge arrives, and then enforcement electrical network surge protection.
Fig. 2, power amplifier board-IGBT collector Vce samples, resistance R5 sampled I GBT collector voltage is input to electromagnetic oven IC, Vce holds inside to have a high-pressure MOS switch and an internal resistance, high-pressure MOS switch one end is connected with R5, and the other end is connected with internal resistance, and internal resistance is connected with AGND simultaneously, like this, internal resistance adopts voltage to be IGBT collector Vce dividing potential drop; Wherein, the effect of this high-pressure MOS switch can be closed when electromagnetic oven is standby, thus cancels the standby consumption of R5, reduces electromagnetic oven stand-by power consumption, and opens when electromagnetic oven works; Internal resistance sampled voltage may be used for: the protection of self-adapting resonance circuit, IGBT UHV (ultra-high voltage), the adjustment of IGBT high pressure, the adjustment of IGBT the lowest point etc.
Fig. 2, power amplifier board-electromagnetic oven IC, its self-adapting resonance circuit, according to line voltage Vac and IGBT collector voltage Vce, detect that Vce is greater than the duration T1 in Vac cycle, detect that Vce is less than the starting position of Vac, next IGBT power cycle from this position time delay [T1 × scale parameter], drive IGBT grid to export high level; Aforementioned proportion parameter, generally about 0.4, can be suitable for different electromagnetic oven cookers, and can follow the tracks of pan resonance characteristic, realizes IGBT the lowest point Precision switch; Have a DAC-circuit, it exports duration, i.e. the IGBT service time of control IGBT grid high level, and then controls electromagnetic oven power input or output power, and DAC-circuit input is realized by single port FT digital communication.IGBT high pressure adjusts, if find that there is high pressure trend at IGBT collector voltage Vce peak, electromagnetic oven IC internal circuit is preferential and adjust the above-mentioned DAC-circuit input in the end in right amount, reduces electromagnetic oven power input, turns down Vce peak; IGBT the lowest point adjusts, and in the lowest point of IGBT collector voltage waveform, if voltage is higher, IGBT increases, electromagnetic oven IC internal circuit heightens the input of above-mentioned DAC-circuit in right amount, improves electromagnetic oven power input, heightens Vce peak, and Vce the lowest point declines.Also have other method to be suitable for self-adapting resonance circuit, detect as done the lowest point based on IGBT collector voltage Vce signal; Or detect IGBT collector voltage the lowest point by an external capacitive; Importantly, self-adapting resonance circuit must can be competent at the change of pan, follows the tracks of pan resonance characteristic, realizes IGBT accurate the lowest point switch, reduces IGBT switching loss.
Fig. 2, power amplifier board-power network current Iac samples, and constantan wire R1 sampling power network current Iac is input to electromagnetic oven IC through R4, and Iac holds internal calculating circuits to keep Iac end to equal AGND in analog, therefore R4 electric current represents power network current Iac, thus power network current Iac is input to Iac end;
Fig. 2, power amplifier board-electromagnetic oven IC-power calculation, there is a power calculation multiplier, this power calculation multiplier input end is the line voltage Vac dividing potential drop that Vac holds internal sample, another input end is the power network current Iac that Iac holds internal sample, the output of this power calculation multiplier is that electric current exports and outputs to POWER end, wherein R11 accurate adjustment electromagnetic oven power input.
Fig. 2, power amplifier board-electromagnetic oven IC-single port digital communication, FT end communicates with main control singlechip, completes various electromagnetic oven analog quantity ADC sampling, the input of electromagnetic oven power input control DAC-circuit, the I/O of various control figure amount.
Fig. 2, power amplifier board-electromagnetic oven IC-other, FAN fan control export, V5 export 5V power, Tigbt IBGT temperature sampling, Tmain cooking bottom temperature sampling, IN1/OUT1 backup temperature sampling or driver output.
Fig. 2, Fig. 3, display board, adopts membrane keyboard and LED display driver IC to complete the input of electromagnetic oven membrane keyboard, LED display translation.Usually, electromagnetic oven scheme only needs employing 2 membrane keyboards and LED display driver IC.
Fig. 2, electromagnetic oven, main control singlechip adopts without the need to the known general single chip of ADC function, 1 electromagnetic oven IC and 2 membrane keyboard and LED display driver IC, main control singlechip only needs employing 3 common ports to complete 3 single port digital communications, like this, power amplifier board and display board only need 3 lines to be connected, and are much better than more than known electromagnetic oven 9 line and connect.And use from electromagnetic oven element, greatly few and known electromagnetic oven uses parts number.It may be noted that electromagnetic oven IC of the present invention has many schemes, Fig. 2 is FA scheme, and infringer can utilize mentality of designing of the present invention to reduce the advance of electromagnetic oven IC to avoid infringement; Therefore, the most important electromagnetic oven mentality of designing of the present invention has, self-adapting resonance, power calculation multiplier and single port digital communication.
Above embodiment only illustrates the use of the present invention, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or distortion can be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (5)
1. membrane keyboard and a LED display driver IC, is characterized in that, is integrated with membrane keyboard and LED display driver two kinds of functions in one piece of IC.
2., according to membrane keyboard and LED display driver IC described in claim 1, it is characterized in that, some ports of this IC can be selected driving LED, also can select membrane keyboard or even traditional keyboard.
3. according to membrane keyboard and LED display driver IC described in claim 1, it is characterized in that, adopt single port digital communication.
4., according to membrane keyboard and LED display driver IC described in claim 1, it is characterized in that having driving LED to show synchronous mouth SY.
5. according to membrane keyboard and LED display driver IC described in claim 3, it is characterized in that, adopt ADC code to read membrane keyboard or keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310664810.2A CN104698910A (en) | 2013-12-10 | 2013-12-10 | Touch key and LED display drive IC (integrated circuit) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664810.2A CN104698910A (en) | 2013-12-10 | 2013-12-10 | Touch key and LED display drive IC (integrated circuit) |
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| CN104698910A true CN104698910A (en) | 2015-06-10 |
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| US5499026A (en) * | 1990-01-11 | 1996-03-12 | Varitronix Limited | Conductive touch pad with capacitive blocking filter |
| CN101232279A (en) * | 2007-01-25 | 2008-07-30 | 盛群半导体股份有限公司 | Touching type switch apparatus of electronic cook ware and input method thereof |
| CN201377830Y (en) * | 2008-12-24 | 2010-01-06 | 贺友义 | LCD display control device of toaster |
| CN102767850A (en) * | 2012-08-13 | 2012-11-07 | 王永队 | Intelligent safety control device for household gas cooker |
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2013
- 2013-12-10 CN CN201310664810.2A patent/CN104698910A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499026A (en) * | 1990-01-11 | 1996-03-12 | Varitronix Limited | Conductive touch pad with capacitive blocking filter |
| CN101232279A (en) * | 2007-01-25 | 2008-07-30 | 盛群半导体股份有限公司 | Touching type switch apparatus of electronic cook ware and input method thereof |
| CN201377830Y (en) * | 2008-12-24 | 2010-01-06 | 贺友义 | LCD display control device of toaster |
| CN102767850A (en) * | 2012-08-13 | 2012-11-07 | 王永队 | Intelligent safety control device for household gas cooker |
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