CN101494024B - LED display drive and keyboard control chip - Google Patents
LED display drive and keyboard control chip Download PDFInfo
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- CN101494024B CN101494024B CN2009101110135A CN200910111013A CN101494024B CN 101494024 B CN101494024 B CN 101494024B CN 2009101110135 A CN2009101110135 A CN 2009101110135A CN 200910111013 A CN200910111013 A CN 200910111013A CN 101494024 B CN101494024 B CN 101494024B
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Abstract
The invention discloses an LED display driving and keyboard control chip which is characterized in that a control module output end of the chip is connected with a serial interface module input end, a cryptographic module input end, a block code driven output module input end and a bit decoding and driving output module input end; a control module input end is connected with a serial interface module output end, a cryptographic module output end, an internal oscillating and frequency dividing module output end, a power on reset pulse generator output end and a keyboard detecting and debouncing module output end; the serial interface module output end is connected with a display memory module input end; and a display memory module output end is connected with the block code driven output module input end.
Description
Technical field
The present invention relates to a kind of LED display driver and keyboard control chip.
Background technology
Owing to the continuous development of science and technology, the research and development of electronic product panel control chip also make much progress, and charactron (LED) drives and keyboard control chip is researched and produced the existing report of application about having simultaneously.But from the retrieval situation, existing charactron (LED) drives and also there is shortcomings such as can't carrying out identification in keyboard control chip, needs its further improvement.
Summary of the invention
Task of the present invention will be improved existing LED display driver and keyboard control chip structure exactly, a kind of new LED display driver and keyboard control chip are provided, can't carry out shortcoming such as identification with what overcome that existing charactron (LED) drives and keyboard control chip exists.Task of the present invention is finished by the following technical solutions:
The present invention includes control module, serial interface module, the display-memory module, encrypting module, internal oscillator and frequency division module, the electrification reset pulse producer, segment encode drives output module, position decoding and driving output module, keyboard detection and go to shake module, described control module output terminal and serial interface module input end, the encrypting module input end, segment encode drives the output module input end, position decoding is connected with driving output module input end, control module input end and serial interface module output terminal, the encrypting module output terminal, internal oscillator and frequency division module output terminal, electrification reset pulse producer output terminal, keyboard detection and remove to shake the module output terminal and connect, the serial interface module output terminal is connected with the display-memory module input, and display-memory module output terminal drives the output module input end with segment encode and is connected.
The present invention mainly is the application characteristic according to us, and deisgn product targetedly, and add some specific functions makes it to become and has our corporate identity, and cost has the product of certain advantage.Product design of the present invention has following advantage:
1, add encrypting module in the chip: practicable authentication function does not increase the cost of system, intellecture property that again can protection system.
2, chip of the present invention adopts schemes such as three Bus interface modes, built-in oscillatory circuit and built-in electrify restoration circuit, has saved the I/O pin, has also simplified peripheral circuit and the cost that has reduced application system simultaneously.With electrification reset, oscillator, keyboard scan and latching of showing, drive and integrate, need not peripheral component.
3, display brightness is adjustable, and it is optional to drive figure place, and the output hop count is optional, is applicable to different displays, applying flexible.
Circuit of the present invention is simple, economical and practical, is a very commercioganic new product.
Description of drawings
Fig. 1 is the block diagram of a kind of embodiment of the present invention.
Embodiment
The present invention is further described below in conjunction with the specific embodiment of accompanying drawing.(but not being limitation of the present invention).
Embodiment 1
As shown in Figure 1, be the block diagram of a kind of embodiment of the present invention.As seen from the figure, chip of the present invention comprises control module, serial interface module, the display-memory module, encrypting module, internal oscillator and frequency division module, the electrification reset pulse producer, segment encode drives output module, position decoding and driving output module, keyboard detection and go to shake module, described control module output terminal and serial interface module input end, the encrypting module input end, segment encode drives the output module input end, position decoding is connected with driving output module input end, control module input end and serial interface module output terminal, the encrypting module output terminal, internal oscillator and frequency division module output terminal, electrification reset pulse producer output terminal, keyboard detection and remove to shake the module output terminal and connect, the serial interface module output terminal is connected display-memory module output terminal and is connected with segment encode driving output module input end with the display-memory module input.
Encrypting module is mainly used for authentication in the chip of the present invention, is made up of the polynomial expression shift register, and multidigit input reference mark is set, and can produce 2
nIndividual different polynomial expression, different users can be programmed to different polynomial expressions, and polynomial expression triggers displacement under certain conditions, and each polynomial expression can export several ten thousand data and do not repeat, so enough as authentication.
Serial line interface is a three-wire type in the chip of the present invention, is compatible with the SPI universal serial bus, and three lines are defined as clock line (CLK), select lines (STB) and data I (DIO), and sequential meets the requirement of spi bus.Oscillatory circuit can add the frequency divider composition with circular oscillator in the chip of the present invention.
Needed clock of chip of the present invention and reset circuit all design at chip internal, and be outside except keyboard and display, need not any other components and parts, simplified application circuit, think that application system has reduced cost.The present invention adopts schemes such as three Bus interface modes, built-in oscillatory circuit and built-in electrify restoration circuit, has saved the I/O pin, peripheral circuit that also simplifies simultaneously and the cost that has reduced application system.With electrification reset, oscillator, keyboard scan and latching of showing, drive and integrate, need not peripheral component.
The driving force of integrated circuit pipe is suitably regulated the physical dimension of pipe and its parameters such as biasing mainly by the decision of the length and width size of pipe in the chip, can increase its drive current; Or and connect the driving force that a plurality of pipes also can increase whole PAD.
The three-wire type universal serial bus is a synchronous communication mode in the chip, with the rising edge displacement of CLK, is shifted with negative edge during output during input; Reading of keypad information will be gone dithering process, and the present invention goes dithering process to go the shake mode with time-delay, goes the shake mode can reduce the spending of hardware resources with time-delay; The control of display brightness is recently realized by the duty of regulating the output significant level; The driving of chip is controlled by control register, is provided with four control registers altogether.
Chip of the present invention adopts the design of digital-analog mixed CMOS technology; wherein parts such as the scanning of interface, reading scan, keyboard and control realize with Digital Logic; the problem that drives in the chip can be made amendment with the PAD in the java standard library; the breadth length ratio that adds driving tube in the large chip; increase its driving force; this part will use the technology of simulation, and ring oscillator and electrify restoration circuit also are to adopt simulation process to realize.
Chip of the present invention separates realization with numeral and simulation part earlier, at last two parts is carried out hybrid simulation and checking, realizes the function of entire chip.
Embodiment 2
Of the present invention a kind of specific embodiment as shown in Figure 1:
The operating voltage 5V of described chip or 3.3V, digit drive current is greater than 80mA, and the section drive current is greater than 10mA, display mode: 7 sections * 5 or 8 sections * 4, key scanning: 7 * 1bit, briliancy is regulated: 8 grades of dutycycles are adjustable, encapsulation: SOP18 or DIP 18 pin.
More than be specific embodiments of the invention, all similar changes of doing according to above-mentioned design ought to belong to scope of the present invention.
Claims (7)
1. LED display driver and keyboard control chip, it is characterized in that, described chip comprises control module, serial interface module, the display-memory module, encrypting module, internal oscillator and frequency division module, the electrification reset pulse producer, segment encode drives output module, position decoding and driving output module, keyboard detection and go to shake module, described control module output terminal and serial interface module input end, the encrypting module input end, segment encode drives the output module input end, position decoding is connected with driving output module input end, control module input end and serial interface module output terminal, the encrypting module output terminal, internal oscillator and frequency division module output terminal, electrification reset pulse producer output terminal, keyboard detection and remove to shake the module output terminal and connect, the serial interface module output terminal is connected with the display-memory module input, display-memory module output terminal drives the output module input end with segment encode and is connected, encrypting module is used for authentication, form by the polynomial expression shift register, multidigit input reference mark is set.
2. integrated circuit (IC) chip according to claim 1, it is characterized in that, the serial line interface of described chip is a three-wire type, be compatible with the SPI universal serial bus, three lines are clock line, select lines and data I, sequential meets the requirement of spi bus, and the oscillatory circuit of described chip adds frequency divider with circular oscillator and forms.
3. chip according to claim 1 is characterized in that, the clock and the reset circuit of described chip are located at chip internal.
4. chip according to claim 1 is characterized in that, the universal serial bus of described chip is a synchronous communication mode, with the rising edge displacement of CLK, is shifted with negative edge during output during input.
5. chip according to claim 1 is characterized in that, the keyboard of described chip goes dithering process to go the shake mode with time-delay.
6. chip according to claim 1 is characterized in that, the control of the display brightness of described chip is recently realized by the duty of regulating the output significant level; Described driving is controlled by control register, and four control registers are set altogether.
7. chip according to claim 1; it is characterized in that; described chip adopts the design of digital-analog mixed CMOS technology; wherein the scanning of interface, reading scan, keyboard and control section are realized with Digital Logic; the problem that drives is made amendment with the PAD in the java standard library, strengthens the breadth length ratio of driving tube, the driving force that increases chip, ring oscillator and electrify restoration circuit and adopts simulation process to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101110135A CN101494024B (en) | 2009-02-11 | 2009-02-11 | LED display drive and keyboard control chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101110135A CN101494024B (en) | 2009-02-11 | 2009-02-11 | LED display drive and keyboard control chip |
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| Publication Number | Publication Date |
|---|---|
| CN101494024A CN101494024A (en) | 2009-07-29 |
| CN101494024B true CN101494024B (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101110135A Expired - Fee Related CN101494024B (en) | 2009-02-11 | 2009-02-11 | LED display drive and keyboard control chip |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102880274A (en) * | 2012-09-04 | 2013-01-16 | 福州福大海矽集成电路有限公司 | Standby state power management chip of electronic product |
| CN103761942B (en) * | 2014-02-14 | 2015-09-30 | 福州福大海矽微电子有限公司 | The numeral method of tool array display multiplexing algorithm and key control chip |
| CN106960647B (en) * | 2017-05-24 | 2020-12-01 | 海芯科技(厦门)有限公司 | Energy-saving light-emitting nixie tube display driving circuit |
| CN110070827B (en) * | 2019-05-22 | 2023-05-23 | 富满微电子集团股份有限公司 | LED display screen driving chip, latch signal generation method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514420Y (en) * | 2001-08-23 | 2002-10-02 | 湖南计算机股份有限公司 | Chip for 24 lattice Chinese and Western language display terminal |
| CN2779487Y (en) * | 2005-03-09 | 2006-05-10 | 彭彬 | RS-485 network based data input terminal |
| CN1898718A (en) * | 2003-12-10 | 2007-01-17 | 皇家飞利浦电子股份有限公司 | Video data signal correction |
| CN2919361Y (en) * | 2005-11-04 | 2007-07-04 | 上海海事大学 | Interface module between keyboard and LED displayer based on basic bus |
| CN201340716Y (en) * | 2009-02-11 | 2009-11-04 | 福州福大海矽微电子有限公司 | Electronic product panel control chip |
-
2009
- 2009-02-11 CN CN2009101110135A patent/CN101494024B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514420Y (en) * | 2001-08-23 | 2002-10-02 | 湖南计算机股份有限公司 | Chip for 24 lattice Chinese and Western language display terminal |
| CN1898718A (en) * | 2003-12-10 | 2007-01-17 | 皇家飞利浦电子股份有限公司 | Video data signal correction |
| CN2779487Y (en) * | 2005-03-09 | 2006-05-10 | 彭彬 | RS-485 network based data input terminal |
| CN2919361Y (en) * | 2005-11-04 | 2007-07-04 | 上海海事大学 | Interface module between keyboard and LED displayer based on basic bus |
| CN201340716Y (en) * | 2009-02-11 | 2009-11-04 | 福州福大海矽微电子有限公司 | Electronic product panel control chip |
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| CN101494024A (en) | 2009-07-29 |
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Granted publication date: 20110824 Termination date: 20180211 |