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
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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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