How To Drive The Two-in-one Common Yang Digital Tube?

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For the LED digital tube, a single digital tube can light up different LED segments, and then form the corresponding numbers, so how to drive the digital tube?

Because two different numbers need to be displayed, the dynamic scanning method must be used to realize it, that is, the ones digit is displayed for 1 millisecond, and then the ten digit is displayed for 1 millisecond, and the cycle is repeated. The visual residual effect of the human eye, seeing two different numbers displayed steadily.

The single-chip driving method of the common cathode digital tube, the circuit is as follows:

+5V directly supplies power to the 8 segments of the digital tube through the 1K resistance exclusion, and the P2.6 and P2.7 ports control the power supply of the tens and one digit of the digital tube respectively. When the corresponding port becomes low level, the corresponding bits can sink current. The data output by the P0 port of the single-chip microcomputer is equivalent to short-circuiting the digital segment that the digital tube does not display to the ground, so that the digital tube will display the required number.

The hardware of the common cathode digital tube is simpler, so in mass production, the hardware cost is small, the PCB area is saved, the welding workload is reduced, and the overall cost is reduced, so the use of the common cathode digital tube is more conducive to mass production. It is a common cathode digital tube.