CN201340716Y

CN201340716Y - Electronic product panel control chip

Info

Publication number: CN201340716Y
Application number: CNU2009201366429U
Authority: CN
Inventors: 张进; 施隆照
Original assignee: FUZHOU FUDA HISI MICROELECTRONICS Co Ltd
Current assignee: FUZHOU FUDA HISI MICROELECTRONICS Co Ltd
Priority date: 2009-02-11
Filing date: 2009-02-11
Publication date: 2009-11-04
Anticipated expiration: 2019-02-11

Abstract

The utility model discloses an electronic product panel control chip, in particular to an LED display driver 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, an encrypting module input end, a segment-code driver output module input end and a bit decoder and driver output module input end, a control module input end is connected with a serial interface module output end, an encrypting module output end, an internal oscillator and frequency demultiplier module output end, a power-on reset pulse generator output end and a keyboard detection and debounce module output end, a serial interface module output end is connected with a display memory module input end, and a display memory module output end is connected with a segment-code driver output module input end.

Description

A kind of electronic product panel control chip

Technical field

The utility model relates to a kind of electronic product panel control chip, concrete a kind of charactron (LED) display driver and the keyboard control chip of relating to.

Background technology

Because the continuous development of science and technology, the control chip research and development of electronic product panel also make much progress, and charactron (LED) drives and researching and producing of keyboard control chip (a kind of electronic product panel control chip) used existing report 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 utility model will be improved existing LED display driver and keyboard control chip 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 utility model is finished by the following technical solutions:

The utility model 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, and display-memory module output terminal drives the output module input end with segment encode and is connected.

The utility model 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.The utility model product design 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, the utility model chip adopts three Bus interface modes, and schemes such as built-in oscillatory circuit and built-in electrify restoration circuit have been saved the IO 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.

4, circuit of the present utility model is simple, and 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 utility model.

Embodiment

Specific embodiment below in conjunction with accompanying drawing further specifies the utility model.(but not being) to restriction of the present utility model.

Embodiment 1

As shown in Figure 1, be the block diagram of a kind of embodiment of the present utility model.As seen from the figure, chip described in the utility model 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, and display-memory module output terminal drives the output module input end with segment encode and is connected.

Encrypting module is made up of the polynomial expression shift register in the utility model chip, and multidigit input reference mark is set, and can produce 2 ⁿIndividual different polynomial expression, the utility model encrypting module is mainly used for authentication, so enough as authentication.

Serial line interface is a three-wire type in the chip of the present utility model, 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 of the present utility model can add frequency divider with circular oscillator and form.

Needed hour hands of the utility model chip 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 work of driver is controlled by control register in the chip of the present utility model, is provided with four control registers altogether.

Embodiment 2

Of the present utility model 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 embodiment of the utility model, all similar changes of doing according to above-mentioned design ought to belong to scope of the present utility model.

Claims

1, a kind of electronic product panel 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, and display-memory module output terminal drives the output module input end with segment encode and is connected.

2. chip according to claim 1 is characterized in that described encrypting module is made up of the polynomial expression shift register, and multidigit input reference mark is set.

3. chip according to claim 1 is characterized in that, serial line interface is a three-wire type in the described chip, and three lines are clock line, select lines and data I,

4. chip according to claim 1 is characterized in that, oscillatory circuit adds the frequency divider composition with circular oscillator in the described chip.

5. chip according to claim 1 is characterized in that, the hour hands and the reset circuit of described chip are located at chip internal.

6. chip according to claim 1 is characterized in that driver is controlled by control register in the described chip, and four control registers are set altogether.

7. chip according to claim 1, it is characterized in that, the operating voltage 5V of described chip or 3.3V, digit drive current is greater than 80mA, the section drive current 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.