CN209708604U

CN209708604U - A kind of digital management driving circuit

Info

Publication number: CN209708604U
Application number: CN201920752132.8U
Authority: CN
Inventors: 陈新; 山江林; 钟学荣; 罗军
Original assignee: Foshan Shunde New Xun Electronic Technology Co Ltd
Current assignee: Foshan Shunde New Xun Electronic Technology Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2019-11-29
Anticipated expiration: 2029-05-23

Abstract

The utility model provides a kind of digital management driving circuit, including single-chip microcontroller, the charactron combined by long number；A part of I/O mouthfuls of the single-chip microcontroller one section of light emitting diode respectively driven in charactron bits per inch word forms output end SEG, and the chip selection signal for connecing digits in charactron respectively there are also several I/O mouthfuls forms common end COM；I/O mouth for output end SEG can be also used for input terminal, and single-chip microcontroller is by the way of time-sharing multiplex, and when wanting charactron to scan, I/O mouthfuls are set as output state, and common end COM is opened, and carry out numeral method scanning；When input terminal to be done, I/O mouthfuls are set as input state, and common end COM is closed, and read input signal.Multiple functions are just realized with seldom port I/O in the utility model, overcome the not enough situation in single-chip processor i/o port.Cost, good market prospect can also be reduced with this circuit arrangement.

Description

A kind of digital management driving circuit

Technical field

Charactron when being managed the utility model relates to Nixie tube drive circuit field, especially a kind of MCU driving number Manage driving circuit.

Background technique

Charactron is made of 7 light emitting diodes, and row is at a figure of eight, by connecting corresponding light-emitting diodes shape At the display of corresponding number 0-9.Referred to as seven segmentation light emitting diodes, each section is made of a light emitting diode, Wo Menfen It is other that these light emitting diodes are named as " a, b, c, d, e, f, g ".Charactron is divided by the connection type of each light-emitting diodes pipe electrode For common anode charactron and two kinds of common cathode charactron.Common cathode charactron refers to that the cathode by all light emitting diodes is connected to and is formed together The charactron of common cathode.Public pole should be connected on ground wire by common cathode charactron in application, when a certain field light emitting diode Anode be high level when, respective field is just lighted.When the anode of a certain field is low level, respective field does not just work.Altogether Positive charactron refers to that the anode by all light emitting diodes is connected to the charactron for being formed together public anode.Common anode charactron is being answered Public pole should be connected to DC power supply by the used time, and when the cathode of a certain field light emitting diode is low level, respective field is with regard to point It is bright.When the cathode of a certain field is high level, respective field does not just work.

Charactron normally to show it is necessary to driving circuit come each segment encode of drive digital tube, to show us The number wanted.Currently, numeral method is generally by the way of dynamic scan, circuit connecting are as follows: common end COM and output end SEG.Each AD detection needs to use 1 I/O port, and it is necessary to multiple I/O ports when having multi-channel A/D, single-chip processor i/o mouth is often inadequate With or cost declining when just cannot preferably optimize.

Utility model content

For the utility model in current Nixie tube drive circuit, charactron scans the circuit by the way of dynamic scan Connection are as follows: common end COM and output end SEG.Each AD detection needs to use 1 I/O port, it is necessary to multiple when having multi-channel A/D I/O port, the frequent not enough deficiency of single-chip processor i/o mouth provide a kind of digital management driving circuit.

The utility model is that technical solution used by realizing its technical purpose is: a kind of digital management driving circuit, packet The charactron for including single-chip microcontroller, being combined by long number；A part of I/O mouthfuls of the single-chip microcontroller respectively drives charactron bits per inch word In one section of light emitting diode form output end SEG, the chip selection signal for connecing digits in charactron respectively there are also several I/O mouthfuls Form common end COM；I/O mouth for output end SEG can be also used for input terminal, single-chip microcontroller by the way of time-sharing multiplex, When wanting charactron to scan, I/O mouthfuls are set as output state, and common end COM is opened, and carry out numeral method scanning；When doing When input terminal, I/O mouthfuls are set as input state, and common end COM is closed, and read input signal.

Multiple functions are just realized with seldom port I/O in the utility model, and it is not enough to overcome single-chip processor i/o port Situation.Cost, good market prospect can also be reduced with this circuit arrangement.

Further, in above-mentioned digital management driving circuit: the I/O mouth for output end SEG can be also used for inputting End is used as AD detection input.

Further, in above-mentioned digital management driving circuit: output end SEG is used in single-chip processor i/o mouth, in single-chip microcontroller It is provided with the first current-limiting resistance between I/O mouthfuls and charactron respective pins, when single-chip processor i/o mouth is used for input terminal, also contacts There is the second current-limiting resistance.

Further, in above-mentioned digital management driving circuit: also when input signal enters the I/O mouth as input terminal Filter capacitor is set over the ground.

The utility model is further detailed below in conjunction with the drawings and specific embodiments.

Detailed description of the invention

Attached drawing 1 is the circuit diagram of the utility model.

Specific embodiment

Embodiment 1, number management driving circuit when the present embodiment is a kind of management of MCU driving number, as shown in Figure 1, There are eight I/O mouthfuls, two poles as digital section diode and decimal point in output end SEG drive digital tube in single-chip microcontroller Pipe, 4 are used for the I/O mouth of common end, and COM1, COM2, COM3 and COM4 do charactron scanning, eight I/O mouthfuls of output end SEG1, SEG2, SEG3, SEG4, SEG5, SEG6, SEG7 and SEG8 pass through first resistor R1, R2, R3, R4, R5, R6, R7 and R8 respectively The respective pins for connecing charactron make the number that numeral method is different by the different clock signal of I/O mouthfuls of output.This implementation In example, this eight I/O mouthfuls are also used as input terminal, such as AD detection input, using the time-division in the way of.AD detection input The I/O mouth at end, is AD1, AD2, AD3, AD4, AD5, AD6, AD7 and AD8 respectively, input signal AD1, AD2 of AD detection, AD3, AD4 connects the end I/O of single-chip microcontroller by second resistance R9, R10, R11, R12 after filter power supply C1, C2, C3, C4.

The present embodiment is to be linked into the end SEG using AD signal, and software carries out the inspection of AD signal by the way of time-sharing multiplex It surveys and one-chip machine port is more efficiently utilized in charactron scanning display, extension one-chip machine port application, cooperation software programming.

Its specific job control principle are as follows:

1. SEG1-SEG8 is set as output state when wanting charactron to scan, COM1-COM4 is opened, and it is aobvious to carry out charactron Show scanning.

2. SEG1-SEG8 is set as input state as AD to be detected, COM1-COM4 is closed, and reads AD signal.

The present embodiment is a kind of Digitron display driver circuit, it is that multiplexing application circuit scheme is detected with AD, AD detection One-chip machine port can be saved in this way by sharing control with charactron, just realized multiple functions with seldom port I/O, overcome list The not enough situation in the port piece machine I/O.Cost, good market prospect can also be reduced with this circuit arrangement.

Claims

1. a kind of digital management driving circuit, including single-chip microcontroller, the charactron combined by long number；The single-chip microcontroller one The I/O mouthfuls of one section of light emitting diode respectively driven in charactron bits per inch word are divided to form output end SEG, there are also several I/O mouthfuls points The chip selection signal for not connecing digits in charactron forms common end COM；It is characterized by: the I/O mouth for output end SEG is also Can be used for input terminal, single-chip microcontroller by the way of time-sharing multiplex,

When wanting charactron to scan, I/O mouthfuls are set as output state, and common end COM is opened, and carry out numeral method scanning；

When input terminal to be done, I/O mouthfuls are set as input state, and common end COM is closed, and read input signal.

2. digital management driving circuit according to claim 1, it is characterised in that: the I/O mouth for output end SEG may be used also To be used for input terminal as AD detection input.

3. digital management driving circuit according to claim 1 or 2, it is characterised in that: in single-chip processor i/o mouth for exporting SEG is held, the first current-limiting resistance is provided between single-chip processor i/o mouth and charactron respective pins, in single-chip processor i/o mouth for defeated When entering to hold, it is also connected with the second current-limiting resistance.

4. digital management driving circuit according to claim 3, it is characterised in that: enter in input signal as input terminal I/O mouth when filter capacitor is also set over the ground.