CN204632311U - The integrated circuit that the keyboard & display adopting pin multiplexing technology to realize drives - Google Patents
The integrated circuit that the keyboard & display adopting pin multiplexing technology to realize drives Download PDFInfo
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- CN204632311U CN204632311U CN201520145254.2U CN201520145254U CN204632311U CN 204632311 U CN204632311 U CN 204632311U CN 201520145254 U CN201520145254 U CN 201520145254U CN 204632311 U CN204632311 U CN 204632311U
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Abstract
The utility model relates to the integrated circuit that a kind of keyboard & display adopting pin multiplexing technology to realize drives, and it is characterized in that: comprise communication interface modules, control module, display-memory module, keyboard & display scan control module, display segment turntable driving export with keyboard line scanning output module, show bit scan driver output and keyboard row state detection module, keyboard Key dithering, electrification reset pulse producer and internal oscillator and frequency division module; This integrated circuit can reduce the number of pins of chip compared to traditional integrated circuit, reduces the cost of chip.
Description
Technical field
The utility model relates to the integrated circuit that a kind of keyboard & display adopting pin multiplexing technology to realize drives.
Background technology
Traditional charactron or LED array display driver chip, generally all only for common cathode light-emitting diode display or common anode light-emitting diode display, if driving N position display at least needs N+8 pin to control it, the number of pins of needs is more.And the pin of keyboard portion all can only be a part of multiplexing with display, another part adopts independently pin, and because this in turn increases certain number of pins, whole chip uses number of pins many in general, and cost compare is high.The present invention proposes the number of pins that a kind of scheme effectively reduces chip, reduces the cost of chip.
Utility model content
The purpose of this utility model is to provide the integrated circuit that a kind of keyboard & display adopting pin multiplexing technology to realize drives, and the number of pins of the less chip of energy, reduces the cost of chip.
The utility model adopts following scheme to realize: the integrated circuit that a kind of keyboard & display adopting pin multiplexing technology to realize drives, and it is characterized in that: comprise communication interface modules, control module, display-memory module, keyboard & display scan control module, display segment turntable driving export with keyboard line scanning output module, show bit scan driver output and keyboard row state detection module, keyboard Key dithering, electrification reset pulse producer and internal oscillator and frequency division module; Wherein, the model calling such as described control module and described communication interface modules, display-memory module, keyboard & display scan control module, keyboard Key dithering, electrification reset pulse producer, internal oscillator and frequency division module; Described keyboard & display scan control module also exports with described display-memory module, display segment turntable driving with keyboard line scanning output module, shows bit scan driver output and be connected with keyboard row state detection module; Described display bit scan driver output and keyboard row state detection module and described keyboard Key dithering model calling; Described display segment turntable driving exports and is connected with display segment pin SEGi with keyboard line scanning output module; Described display bit scan driver output is connected with display position pin DIGn with keyboard row state detection module; Keyboard line scanning output pin and the multiplexing described SEGi pin of display segment turntable driving output pin, display bit scan driver output pin and the DIGn pin described in keyboard row pin multiplexing; Be provided with the logical circuit of different potentials in wherein multiplexing DIGn pin, the logical circuit of noble potential be processed into high and low two kinds of level as output scanning, the logical circuit of electronegative potential is processed into high and low two kinds of level as input scanning.
In the utility model one embodiment, described built-in logic circuit comprises input logic and output logic, and described input logic is made up of this schmitt trigger and level shifting circuit cascade; Described output logic is made up of ESD circuit and ternary output cascade.
Traditional dynamic LED display driver can only drive common cathode display or common anode display, needs 8 pins to export the section controlling display for 2N position display, and 2N pin exports the position controlling display.Not only the present invention proposes can drive common cathode display but also can drive common anode display as display driver, then can only need N+8 pin just can a control 2N display, wherein N number of display common anode display, N number of display common cathode display, saves N number of pin in addition.Another aspect, traditional Keyboard and display control chip, all only have the alignment of keyboard to share with display pin, the line of keyboard is individual pin.If line is I root, then can realize 8*I or 2N*I button.The line that the present invention proposes as keyboard also shares with display pin, then can scan at most 8*N button for 2N display system, save lower I pin by contrast.Therefore, adopt the keyboard display controller of this patent scheme compared with traditional keyboard display controller, saved altogether N+I pin, reduced the packaging cost of chip.
Accompanying drawing explanation
Fig. 1 is multimode pin multiplexing structural representation.
Fig. 2 is I/O scan time diagram.
Fig. 3 is the internal circuit theory diagram of the utility model chip.
Fig. 4 is one and drives 8 7-segment code display and the Keyboard and display control chip package schematic diagram scanning 8*4 button.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
In order to the feature allowing those skilled in the art better understand the utility model circuit, here first pin multiplexing technology is simply introduced, as shown in Figure 1, first, two things are represented with two current potentials, with the high and low level driving LED pilot lamp of noble potential (3.3V as in figure), represent the conjunction of button with the high and low level of electronegative potential (1.5V as in figure) and open two states; Secondly, I/O be separated in sequential, as shown in Figure 2, high level time section is for exporting scanning display, and low level time section is that button is read in input; Display translation high-impedance state during reading button, isolates display translation and external circuit; Reading scan cycle key-press input is invalid.When button is without when pressing, the voltage at pin place is pulled upward to 1.5V by the 10K pull-up resistor of inside, but 1.5V undertension is to make LED light bright, so do not affect the state of LED light; When button is pressed, the voltage at pin place is determined by two electric resistance partial pressures, is about 0.25V.The 2K Europe resistance because of button string, does not affect the brightness of LED light when the button is pressed substantially yet.Shown in shown Fig. 1, the low and high level of the electronegative potential of circuit is respectively 1.5V and 0.25V, and this schmitt trigger conversion in input logic becomes 1.5V and 0V, then is converted to the high and low level voltage of noble potential by level-conversion circuit.
On the basis of above-mentioned pin multiplexing technology, refer to Fig. 3, the utility model proposes the integrated circuit that a kind of keyboard & display adopting pin multiplexing technology to realize drives, it is characterized in that: comprise communication interface modules, control module, display-memory module, keyboard & display scan control module, display segment turntable driving export with keyboard line scanning output module, show bit scan driver output and keyboard row state detection module, keyboard Key dithering, electrification reset pulse producer and internal oscillator and frequency division module; Wherein, the model calling such as described control module and described communication interface modules, display-memory module, keyboard & display scan control module, keyboard Key dithering, electrification reset pulse producer, internal oscillator and frequency division module; Described keyboard & display scan control module also exports with described display-memory module, display segment turntable driving with keyboard line scanning output module, shows bit scan driver output and be connected with keyboard row state detection module; Described display bit scan driver output and keyboard row state detection module and described keyboard Key dithering model calling; Described display segment turntable driving exports and is connected with display segment pin SEGi with keyboard line scanning output module; Described display bit scan driver output is connected with display position pin DIGn with keyboard row state detection module; Keyboard line scanning output pin and the multiplexing described SEGi pin of display segment turntable driving output pin, display bit scan driver output pin and the DIGn pin described in keyboard row pin multiplexing; The logical circuit of different potentials is provided with in wherein multiplexing DIGn pin, the logical circuit of noble potential is processed into high and low two kinds of level as output scanning, the logical circuit of electronegative potential is processed into high and low two kinds of level as input scanning, wherein i and n be not less than 1 natural number.
Preferably, refer to Fig. 1 and Fig. 2, described built-in logic circuit comprises input logic and output logic, and described input logic is made up of this schmitt trigger and level shifting circuit cascade; Described output logic is made up of ESD circuit and ternary output cascade.In the present embodiment, above-mentioned output logic circuit and input logic circuit are arranged in display bit scan driver output and keyboard row state detection module.
Refer to Fig. 4, Fig. 4 is one and drives 8 7-segment code display and the Keyboard and display control chip package schematic diagram scanning 8*4 button, and it can realize with 16 pin encapsulation, and as shown in Figure 4,16 pinouts are as follows:
The definition of table 1 chip 16 pin
Illustrate: the section output pin SEG1 ~ SEG8 of display is also the output pin KO0 ~ KO7 of keyboard row, the position output pin DIG1 ~ DIG4 of display is also the pin of display DIG5 ~ DIG8 simultaneously, simultaneously also as the row input pin of determinant keyboard.Through this double multiplexing after, 8 displays add 32 key scannings again and only need 12 pins just can realize, add two wires communications pins and power supply, just 16 pins.
The foregoing is only preferred embodiment of the present utility model, all equalizations done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (3)
1. the integrated circuit that the keyboard & display that adopts pin multiplexing technology to realize drives, is characterized in that: comprise communication interface modules, control module, display-memory module, keyboard & display scan control module, display segment turntable driving export with keyboard line scanning output module, show bit scan driver output and keyboard row state detection module, keyboard Key dithering, electrification reset pulse producer and internal oscillator and frequency division module; Wherein, the model calling such as described control module and described communication interface modules, display-memory module, keyboard & display scan control module, keyboard Key dithering, electrification reset pulse producer, internal oscillator and frequency division module; Described keyboard & display scan control module also exports with described display-memory module, display segment turntable driving with keyboard line scanning output module, shows bit scan driver output and be connected with keyboard row state detection module; Described display bit scan driver output and keyboard row state detection module and described keyboard Key dithering model calling; Described display segment turntable driving exports and is connected with display segment pin SEGi with keyboard line scanning output module; Described display bit scan driver output is connected with display position pin DIGn with keyboard row state detection module; Keyboard line scanning output pin and the multiplexing described SEGi pin of display segment turntable driving output pin, display bit scan driver output pin and the DIGn pin described in keyboard row pin multiplexing; Be provided with the logical circuit of different potentials in wherein multiplexing DIGn pin, the logical circuit of noble potential be processed into high and low two kinds of level as output scanning, the logical circuit of electronegative potential is processed into high and low two kinds of level as input scanning.
2. the integrated circuit that the keyboard & display that employing pin multiplexing technology according to claim 1 realizes drives, it is characterized in that: described built-in logic circuit comprises input logic and output logic, described input logic is made up of this schmitt trigger and level shifting circuit cascade; Described output logic is made up of ESD circuit and ternary output cascade.
3. the integrated circuit that the keyboard & display that employing pin multiplexing technology according to claim 1 realizes drives, is characterized in that: this integrated circuit comprises 16 pins, and wherein the layout of pin is as follows: DIG1/DIG5/KI0 is 15; DIG2/DIG6/KI1 is 11; DIG3/DIG7/KI2 is 10; DIG4/DIG8/KI3 is 6; It is 16,9,4,2,1,14,5,3 that SEG1 ~ 8/KO0 ~ 7 are corresponding in turn to; SDA is 13; SCL is 12; VCC is 8; GND is 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145254.2U CN204632311U (en) | 2015-03-16 | 2015-03-16 | The integrated circuit that the keyboard & display adopting pin multiplexing technology to realize drives |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145254.2U CN204632311U (en) | 2015-03-16 | 2015-03-16 | The integrated circuit that the keyboard & display adopting pin multiplexing technology to realize drives |
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| CN204632311U true CN204632311U (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520145254.2U Expired - Fee Related CN204632311U (en) | 2015-03-16 | 2015-03-16 | The integrated circuit that the keyboard & display adopting pin multiplexing technology to realize drives |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302766A (en) * | 2018-08-31 | 2019-02-01 | 深圳市德赛微电子技术有限公司 | A kind of the pin multiplexing control system and its control method of low-power consumption |
| CN110225289A (en) * | 2019-05-14 | 2019-09-10 | 视联动力信息技术股份有限公司 | A kind of conference terminal and interface signal conversion method |
-
2015
- 2015-03-16 CN CN201520145254.2U patent/CN204632311U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302766A (en) * | 2018-08-31 | 2019-02-01 | 深圳市德赛微电子技术有限公司 | A kind of the pin multiplexing control system and its control method of low-power consumption |
| CN110225289A (en) * | 2019-05-14 | 2019-09-10 | 视联动力信息技术股份有限公司 | A kind of conference terminal and interface signal conversion method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 350002, 4 floor, physics North building, 523 Industrial Road, Gulou District, Fujian, Fuzhou Patentee after: FUZHOU FUDA HISI MICROELECTRONICS Co.,Ltd. Address before: 4, No. 350002, industrial road, 523 Industrial Road, Taijiang District, Fujian, Fuzhou Patentee before: FUZHOU FUDA HISI MICROELECTRONICS Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |