Device for button scanning under multi-digit nixie tube driving environment and control method

A multi-digit, digital tube technology, applied in the field of button scanning, can solve the problems of digital tube display confusion, inability to multiplex key scanning with digital tube display drive ports, multiple I/O ports, etc., to achieve stable display and reduce components , cost reduction effect

Active Publication Date: 2014-10-22
NANJING QINHENG MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the digital tube display driver port is multiplexed as the key scanning port, some fields will be lit during the key scanning time slot, resulting in confusion of the digital tube display
To sum up, this technical solution cannot reuse the digital tube display driver port for key scanning without occupying additional I / O ports or using peripheral components.
In the application scenario of digital tube display driver and key scanning, especially in the case of multiple digital tubes and multiple keys, this solution will occupy more I / O ports

Method used

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  • Device for button scanning under multi-digit nixie tube driving environment and control method
  • Device for button scanning under multi-digit nixie tube driving environment and control method
  • Device for button scanning under multi-digit nixie tube driving environment and control method

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Embodiment 1）

[0038] See Figure 5 , Figure 6 , Figure 8 and Figure 9 , this embodiment is a typical application case of digital tube display and key scanning.

[0039] In this embodiment, a display driver chip uses 10 I / O ports to drive the display of 10-bit common-cathode 8-segment digital tubes, and scans 25 keys (more or fewer keys can be realized by different connection methods).

[0040] See Figure 6 , a device for key scanning in a multi-digit digital tube driving environment, including a display driver chip, the display driver chip has a plurality of I / O ports; the I / O port has an output buffer 1, a decoding device 2, and a comparison device 3 , switch S1, switch S2, and multiple built-in voltages; the output buffer has two states of enable and disable; built-in voltages include high voltage V H , low voltage V L , reference voltage V K , button scan voltage V S , button scan default voltage V PD . The power supply terminal of the output buffer 1 is connected to the hi...

Embodiment 2

[0055] Wherein, the comparison device 3 can also be a buffer 3.2, the input end of the buffer 3.2 is connected to the common end of the switches S1 and S2, and the output end is connected to the signal Key in terminal; reference voltage V K For the built-in toggle voltage of the buffer 3.2, refer to Figure 7 .

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Abstract

The invention relates to a device for button scanning under a multi-digit nixie tube driving environment and a control method thereof. Each I/O port of the device comprises an output buffer, a decoding device, a comparing device, switches and a plurality of built-in voltages. According to the control method of the invention, a button scanning voltage VS and a button scanning default voltage VPD, which are selected reasonably, are used to scan buttons, and the driving capacity of the VPD is lower than that of the VS, so that a display driving port of a nixie tube can be multiplexed for button scanning, additional I/O ports and peripheral elements are not needed, the number of I/O ports used for displaying and driving of the nixie tube and button scanning in a display driving chip and the number of elements at the periphery of the display driving chip are reduced, the utilization rate of I/O resources of the display driving chip is improved, the packaging cost of the display driving chip and the PCB cost are reduced, the system stability is improved, and the area of a PCB is reduced.

Description

technical field [0001] The invention relates to a key scanning technology, in particular to a key scanning device and control method used in a multi-digit nixie tube driving environment. Background technique [0002] Digital tubes can be divided into common anode digital tubes and common cathode digital tubes according to the connection mode of the light-emitting diode units. The common anode digital tube refers to the digital tube that connects the anodes of all light-emitting diodes together to form a common anode (com). When the common anode digital tube is applied, the common pole should be connected to a high level. When a certain field (seg) emits light When the cathode of the diode is low, the corresponding field is lit. The common cathode digital tube refers to the digital tube that connects the cathodes of all light-emitting diodes together to form a common cathode (com). When the common cathode digital tube is applied, the common pole should be connected to a low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M11/20
Inventor 王春华
Owner NANJING QINHENG MICROELECTRONICS CO LTD
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