CN102456308A - A kind of driving circuit of photoelectric equipment and its driving control method - Google Patents

Abstract

The invention is suitable for the technical field of electronics, and provides a driving circuit of photoelectric equipment and a driving control method thereof, wherein the driving circuit comprises: the first serial-parallel conversion chip is connected with the single chip microcomputer through a three-wire bus, converts serial data output by the single chip microcomputer into parallel data and outputs the parallel data to a section control end of the photoelectric equipment; and the second serial-parallel conversion chip converts the serial data overflowing from the first serial-parallel conversion chip into parallel data and outputs the parallel data to a bit gating end of the photoelectric equipment to control the display section data of the photoelectric equipment. The invention connects a plurality of serial-parallel conversion chips between the singlechip and the nixie tube, completes the conversion of data serial-in and parallel-out through the serial-parallel conversion chips, realizes the control of the driving photoelectric equipment by only using a three-terminal bus, reduces the occupancy rate of the I/O port of the singlechip, ensures that the limited I/O port of the singlechip can complete more control tasks, simplifies the circuit and improves the reliability of the circuit.

Description

A kind of driving circuit of photoelectric equipment and its driving control method

technical field

The invention belongs to the field of electronic technology, and in particular relates to a driving circuit of an optoelectronic device and a driving control method thereof.

Background technique

At present, according to the different connection methods of optoelectronic devices such as LED lamps and digital tubes, the drive methods of optoelectronic devices are divided into static drive and dynamic drive. The so-called static drive means that each segment code of each optoelectronic device is controlled by a single chip The I/O port of the single-chip microcomputer is used for driving. This method occupies a lot of I/O ports of the single-chip microcomputer, and the hardware circuit is complicated. The segment selection terminal of the device is connected together, and a bit strobe control circuit is added to the common pole COM of each optoelectronic device. The bit strobe is controlled by an independent I/O line. When the single-chip microcomputer outputs a segment signal, all optoelectronic devices All receive the same segment signal, but only the optoelectronic device that the MCU control bit strobe port COM is turned on will be displayed. Then, by time-sharing and taking turns to control the COM terminals of each digital tube, each digital tube is controlled and displayed in turn. The lighting time of each digital tube is 1-2ms. Due to the phenomenon of human visual persistence and the afterglow effect of light-emitting diodes, What people see is still a set of stable display data, and the power consumption is lower.

Fig. 1 has shown the dynamic drive circuit of existing optoelectronic equipment, wherein by single-chip microcomputer through eight bit data bus P2. The six-bit data buses P3.0 to P3.5 are respectively connected to the bit selection terminals 1 to 6 of the six digital tubes. When the data bus of the single-chip microcomputer outputs segment signals, all digital tubes receive the same segment signal, but only the digital tubes whose control bit strobe port COM of the single-chip microcomputer is turned on will display fonts.

Although this dynamic driving method occupies less single-chip I/O ports than the static driving method, when driving more photoelectric devices, it still cannot reduce the occupation of the single-chip I/O ports, so that the limited I/O ports of the single-chip cannot Complete more control missions.

Contents of the invention

The object of the present invention is to provide a driving circuit of a photoelectric device, aiming at reducing the occupancy rate of the I/O port of a single-chip microcomputer, simplifying the circuit, and improving the reliability of the circuit.

The present invention is achieved in this way, a driving circuit of an optoelectronic device, the driving circuit comprising:

The first serial-to-parallel conversion chip, the first serial-to-parallel conversion chip is connected to the single-chip microcomputer through clock lines, data lines and control lines, and the serial data DIN output by the single-chip microcomputer is converted into parallel data when the clock signal CLK is valid, And when the control line receives the control signal OE, it is output to the segment control terminal of the optoelectronic device in parallel; and

The second serial-to-parallel conversion chip, the second serial-to-parallel conversion chip is connected to the single-chip microcomputer through a clock line and a control line, and is connected to the overflow end of the first serial-to-parallel conversion chip through a data line, and the first The serial data DIN overflowed by the serial-to-parallel conversion chip is converted into parallel data when the clock signal CLK is valid, and when the control line receives the control signal OE, it is output to the bit gate terminal of the optoelectronic device in parallel to control the display of the optoelectronic device segment data.

Another object of the present invention is to provide a drive controller for an optoelectronic device, which includes a single chip microcomputer and the drive circuit for the optoelectronic device.

Another object of the present invention is to provide a method for driving and controlling a photoelectric device, the photoelectric device includes a plurality of photoelectric units, the method includes the step of sequentially driving and controlling a plurality of photoelectric units of the photoelectric device, driving and controlling the photoelectric units The steps of a photoelectric unit of photoelectric equipment are as follows:

The MCU sends serial data to the first serial parallel conversion chip;

The first serial-to-parallel conversion chip sends the overflowed serial data to the second serial-to-parallel conversion chip;

The single-chip microcomputer sends clock signals and control signals to the first series-to-parallel conversion chip and the second series-to-parallel conversion chip;

The first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip convert serial data into parallel data when receiving a valid clock signal;

When the first serial-to-parallel conversion chip receives an effective control signal, it sends the parallel data to a segment control terminal of an optoelectronic unit of the optoelectronic device;

The second serial-to-parallel conversion chip sends the parallel data to the bit gate terminal of an optoelectronic unit of the optoelectronic device when receiving the valid control signal.

The present invention adds two serial-to-parallel conversion chips between the single-chip microcomputer and the digital tube, wherein the first serial-to-parallel conversion chip converts the serial data sent by the single-chip microcomputer into parallel data as the segment data of the digital tube, and the second serial-to-parallel conversion chip is used for Control the bit strobe terminal of the digital tube to display its segment data. The invention utilizes two serial-to-parallel conversion chips to convert the serial data output by the single-chip microcomputer into parallel data, and only uses the three-terminal bus to realize the drive of the photoelectric equipment, reduces the occupancy rate of the single-chip microcomputer I/O port, and makes the limited I/O of the single-chip microcomputer The O port can complete more control tasks, simplify the circuit, and improve the reliability of the circuit.

Description of drawings

Fig. 1 is the driving circuit diagram of the nixie tube that prior art provides;

Fig. 2 is the driving circuit diagram of six nixie tubes provided by the first embodiment of the present invention;

Fig. 3 is the driving circuit diagram of twelve nixie tubes provided by the second embodiment of the present invention;

FIG. 4 is a flow chart of a driving control method for a digital tube provided by a third embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The invention connects a plurality of serial-to-parallel conversion chips between the single-chip microcomputer and the nixie tube, completes the conversion of data serial-in and parallel-out through the serial-to-parallel conversion chips, and realizes only using three-terminal bus to control and drive the photoelectric equipment.

FIG. 2 is a driving circuit diagram of six digital tubes provided by the first embodiment of the present invention. For convenience of description, only the parts related to the present invention are shown.

In this embodiment, the drive circuit of the optoelectronic device includes: a first serial-to-parallel conversion chip (i.e. U1), the U1 can use an 8-bit shift register 74LS595 or 74HC595 with a latch function, and the shift register clock input of U1 The terminal SH_CP is connected with the single-chip microcomputer through the clock line, the input clock signal CLK, the storage register clock input terminal ST_CP of U1 is connected with the single-chip microcomputer through the control line, and the input control signal OE is input, and the serial data input terminal DS of U1 is connected with the single-chip microcomputer through the data line. The serial data DIN output by the single-chip microcomputer is converted into parallel data at the rising edge of the clock pulse signal, and when the control signal OE is input, the eight-bit parallel output terminals Q0 to Q7 of U1 are respectively output to the eight-bit segments of the six digital tubes control terminals B0 to B7; and

The second serial-to-parallel conversion chip (i.e. U2), the U2 can also adopt the 8-bit shift register 74LS595 or 74HC595 with latch function, the shift register clock input terminal SH_CP of U2 is connected with the single-chip microcomputer through the clock line, and the input clock signal CLK, the storage register clock input terminal ST_CP of U2 is connected with the single chip microcomputer through the control line, input control signal OE, the serial data input terminal DS of U2 is connected with the overflow terminal Q7' of U1 through the data line, and the serial data overflowed by U1, When the rising edge of the clock pulse signal CLK is valid, it is converted into parallel data, and when the control signal OE is received, the six-bit parallel output terminals Q0 to Q5 of U2 are output to the bit selection terminals A0 to A5 of the six digital tubes to control The digital tube displays the font.

In the embodiment of the present invention, the single-chip microcomputer controls the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip to convert serial data into parallel data through the three-terminal bus, controls and drives the digital tube to display, and the second serial-to-parallel conversion chip passes through The COM terminal of each digital tube is controlled in turn in time-sharing to realize the dynamic driving of the digital tube.

As an embodiment of the present invention, the number of photoelectric devices such as digital tubes can be driven by adding a third serial-to-parallel conversion chip (ie, U3).

FIG. 3 is a driving circuit diagram of twelve digital tubes provided by the second embodiment of the present invention. The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

In the embodiment of the present invention, three serial-to-parallel conversion chips are used to drive twelve digital tubes, and the connection mode of U1 will not be described again, and the eight-bit parallel output terminals Q0 to Q7 of U2 are output to the bit gates of the eight digital tubes. The terminals A0 to A7, the shift register clock input terminal SH_CP of U3 are connected to the single-chip microcomputer through the clock line, and the input clock signal CLK, the storage register clock input terminal ST_CP of U3 is connected to the single-chip microcomputer through the control line, and the input control signal OE, the serial The data input terminal DS is connected to the overflow terminal Q7' of U2 through the data line, and the serial data overflowed by U2 is converted into parallel data when the rising edge of the clock pulse signal CLK is valid, and when the control signal OE is received, it is used as an extended The bit strobe terminal is output from the parallel output terminals H0 to H3 of U3 to the bit strobe terminals A8 to A11 of the digital tube, and is controlled by U1 and U2 to select the display font of the digital tube.

As a preferred embodiment of the present invention, U3 can also use an 8-bit shift register 74LS595 or 74HC595 with a latch function, and can also add a number of third serial-to-parallel conversion chips to expand the number of photoelectric devices driven. The serial-to-parallel conversion chip can increase the drive of eight digital tubes.

Fig. 4 shows the implementation flow of the driving control method of the digital tube provided by the third embodiment of the present invention, the method includes the steps of sequentially driving and controlling a plurality of photoelectric units of the photoelectric device, driving and controlling one photoelectric unit of the photoelectric device The steps of the unit are as follows:

In step S401, the single-chip microcomputer sends serial data to the first serial-to-parallel conversion chip;

In step S402, the first serial-to-parallel conversion chip sends the overflowed serial data to the second serial-to-parallel conversion chip;

In step S403, the single-chip microcomputer sends a clock signal and a control signal to the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip;

In step S404, the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip convert serial data into parallel data when receiving an effective clock signal;

In step S405, when the first serial-to-parallel conversion chip receives the valid control signal, it sends the parallel data to the segment control terminal of an optoelectronic unit of the optoelectronic device;

In step S406, when the second serial-to-parallel conversion chip receives the valid control signal, it sends the parallel data to the bit gate terminal of an optoelectronic unit of the optoelectronic device.

As a preferred embodiment of the present invention, the method further includes the following steps after step S402: sending the serial data overflowed by the second serial-to-parallel conversion chip to the third serial-to-parallel conversion chip;

After the step S403, the following steps are also included: the single-chip microcomputer sends the clock signal and the control signal to the third serial-to-parallel conversion chip; the third serial-to-parallel conversion chip converts the serial data into parallel data when receiving the valid clock signal;

After step S406, the following steps are further included: when the third serial-to-parallel conversion chip receives the valid control signal, send the parallel data to the bit gate terminal of the optoelectronic device.

As a preferred embodiment of the present invention, the first serial-to-parallel conversion chip, the second serial-to-parallel conversion chip and the third serial-to-parallel conversion chip can all use an 8-bit shift register 74LS595 or 74HC595.

The invention uses a serial-to-parallel conversion chip to convert the serial data output by the single-chip microcomputer into parallel data, only uses the three-terminal bus to realize the drive of the photoelectric equipment, reduces the occupancy rate of the single-chip microcomputer I/O port, simplifies the circuit, and improves the circuit efficiency. reliability.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A drive circuit for optoelectronic equipment, characterized in that the drive circuit comprises: The first serial-to-parallel conversion chip, the first serial-to-parallel conversion chip is connected to the single-chip microcomputer through clock lines, data lines and control lines, and the serial data DIN output by the single-chip microcomputer is converted into parallel data when the clock signal CLK is valid, And when the control line receives the control signal OE, it is output to the segment control terminal of the optoelectronic device in parallel; and The second serial-to-parallel conversion chip, the second serial-to-parallel conversion chip is connected to the single-chip microcomputer through a clock line and a control line, and is connected to the overflow end of the first serial-to-parallel conversion chip through a data line, and the first The serial data DIN overflowed by the serial-to-parallel conversion chip is converted into parallel data when the clock signal CLK is valid, and when the control line receives the control signal OE, it is output to the bit gate terminal of the optoelectronic device in parallel to control the display of the optoelectronic device segment data. 2. The drive circuit according to claim 1, wherein the drive circuit further comprises: The third serial-to-parallel conversion chip, the third serial-to-parallel conversion chip is connected to the single-chip microcomputer through a clock line and a control line, and the data line of the third serial-to-parallel conversion chip is connected to the overflow terminal of the second serial-to-parallel conversion chip connected, the serial data overflowed by the second serial-to-parallel conversion chip is converted into parallel data when the clock signal is valid, and when the control line receives the control signal, it is output to the bit gate terminal of the photoelectric device in parallel, Controls optoelectronic devices to display segment data. 3. The driving circuit according to claim 1, wherein the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip are both 8-bit shift registers with a latch function. 4. The drive circuit according to claim 1, wherein the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip are both 74LS595 chips or 74HC595 chips. 5. The drive circuit according to claim 2, wherein the third serial-to-parallel conversion chip is an 8-bit shift register with a latch function. 6. A drive controller for an optoelectronic device, characterized in that the drive controller for the optoelectronic device comprises a single chip microcomputer and the drive circuit for the optoelectronic device according to any one of claims 1 to 5. 7. A method for driving and controlling an optoelectronic device, the optoelectronic device comprising a plurality of optoelectronic units, wherein the method comprises the step of sequentially driving and controlling a plurality of optoelectronic units of the optoelectronic device, and driving and controlling the optoelectronic device The steps of a photoelectric unit are as follows: The MCU sends serial data to the first serial parallel conversion chip; The first serial-to-parallel conversion chip sends the overflowed serial data to the second serial-to-parallel conversion chip; The microcontroller sends clock signals and control signals to the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip; The first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip convert serial data into parallel data when receiving a valid clock signal; When the first serial-to-parallel conversion chip receives an effective control signal, it sends the parallel data to a segment control terminal of an optoelectronic unit of the optoelectronic device; The second serial-to-parallel conversion chip sends the parallel data to the bit gate terminal of an optoelectronic unit of the optoelectronic device when receiving the valid control signal. 8. The method according to claim 7, characterized in that, after the first serial-to-parallel conversion chip sends the overflowed serial data to the second serial-to-parallel conversion chip, the step further includes: And convert the serial data overflowed by the chip to the third serial parallel conversion chip; After the step of sending the clock signal and the control signal to the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip, the single-chip microcomputer also includes the following steps: the single-chip microcomputer sends the clock signal and the control signal to the third serial-to-parallel conversion chip; And the conversion chip converts serial data into parallel data when it receives a valid clock signal; When the second serial-to-parallel conversion chip receives an effective control signal, the step of sending the parallel data to the bit gate of an optoelectronic unit of the optoelectronic device also includes the following steps: the third serial-to-parallel conversion chip receives the effective Send parallel data to the bit strobe terminal of the optoelectronic device when controlling the signal. 9. The method according to claim 7, wherein the first serial-to-parallel conversion chip and the second serial-to-parallel conversion chip are both 8-bit shift registers with a latch function. 10. The method according to claim 8, wherein the third serial-to-parallel conversion chip is an 8-bit shift register with a latch function.

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