A display control circuit with LED dot matrix mode

Abstract

A display control circuit with an LED dot matrix mode includes: a main control unit U1, which has at least eight I / O ports for driving LEDs; an LED matrix module connected to the I / O ports, which has multiple endpoints for connecting LEDs; and a digital tube connected to the I / O ports, so that the main control unit U1 can drive the LED matrix module and the digital tube simultaneously. This application optimizes the display driving scheme design, achieving the same display effect while eliminating the display driver chip 74HC164 and eight 330-ohm current-limiting resistors, resulting in a cost advantage and simpler and faster PCB design.

Description

Technical Field

[0001] This utility model relates to the field of home appliance display control circuits, and in particular to a display control circuit with an LED dot matrix mode. Background Technology

[0002] In commonly used digital tube and LED display control circuits, due to insufficient I / O port resources of the main control chip, display driver chips such as 74HC164, TM1668, and TM1640 are often used to implement the display of LEDs and digital tubes. In such display driver circuits, to light up a four-digit eight-segment digital tube and 12 LEDs, a 74HC164 display chip is required, along with the main chip's seven COM ports and two communication ports, resulting in high cost and difficulties in PCB board design. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides a display control circuit with an LED dot matrix mode.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] A display control circuit with LED dot matrix mode, comprising:

[0006] The main control unit U1 is provided with at least eight I / O ports for driving LEDs;

[0007] An LED matrix module is connected to the IO port, and the LED matrix module has multiple endpoints for connecting LEDs.

[0008] The digital tube is connected to the IO port so that the main control unit U1 can drive both the LED matrix module and the digital tube simultaneously.

[0009] In some embodiments, the LED matrix module has a region for connecting the internal circuitry of the digital tube.

[0010] In some embodiments, the LEDs include at least LED3, LED4, LED5, LED6, LED7, LED8, LED9, and LED10, wherein one end of LED3 is connected to signal LED0 and the other end is connected to signal LED5; one end of LED4 is connected to signal LED1 and the other end is connected to signal LED5; one end of LED5 is connected to signal LED2 and the other end is connected to signal LED5; LED6 is connected to signal LED3 and the other end is connected to signal LED5; LED7 is connected to signal LED4 and the other end is connected to signal LED5; one end of LED8 is connected to signal LED4 and the other end is connected to signal LED5; one end of LED9 is connected to signal LED4 and the other end is connected to signal LED6; and one end of LED10 is connected to signal LED4 and the other end is connected to signal LED7.

[0011] In some embodiments, a zero-crossing detection circuit is also included, comprising:

[0012] Transistor Q3, the base of transistor Q3 is connected to the input voltage through resistors R11, R10 and R9 in sequence, the emitter receives a voltage, and the collector is connected to the main control unit U1.

[0013] In some embodiments, a voltage detection circuit is further included, which includes;

[0014] Diode D5 is connected to resistor R11, and diode D5 is connected to the main control unit U1 in sequence through resistors R15, R17 and R18.

[0015] The resistor R17 is also connected to the diode D7.

[0016] In some embodiments, a base plate temperature sensor circuit is also included, which includes;

[0017] Terminal CN1 is used to connect a temperature sensor;

[0018] One end of terminal CN1 receives a voltage, the other end is connected to diode D6, and the other end is also connected to the main control unit U1 through resistors R32 and R26 respectively.

[0019] In some embodiments, a relay control circuit is also included, which includes;

[0020] Relay REL1 has one conducting terminal connected to the voltage terminal and the other terminal connected to the heating terminal. One end of the coil terminal of relay REL1 is input with a voltage, and the other end is connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base is connected to the main control unit U1.

[0021] The beneficial effects of this application are:

[0022] This application optimizes the display driver design, achieving the same display effect while eliminating the 74HC164 display driver chip and eight 330-ohm current-limiting resistors, resulting in a cost advantage and simpler and faster PCB design. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 . Detailed Implementation

[0026] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Please refer to Figure 1-2 As shown, a display control circuit with an LED dot matrix mode includes:

[0028] The main control unit U1 is provided with at least eight I / O ports for driving LEDs;

[0029] An LED matrix module is connected to the IO port, and the LED matrix module has multiple endpoints for connecting LEDs.

[0030] The digital tube SMG is connected to the IO port so that the main control unit U1 can drive the LED matrix module and the digital tube simultaneously.

[0031] The main control unit U1 is model TM52F0861C-SOP28. Utilizing the built-in LED dot matrix mode function of this main chip, the I / O ports for driving LEDs and digital tubes are uniformly placed in the LED ports of the main chip (8 I / O ports can drive and display 56 light-emitting points). The I / O ports for driving LEDs and digital tubes are uniformly placed in the LED ports (P9-P16) of the main chip.

[0032] In this embodiment, the LED matrix module has a region for connecting the internal circuitry of the digital tube.

[0033] The program is designed to illuminate each LED and each line of the digital tube one stroke at a time, and then quickly scan to achieve LED illumination and digital display. The program can also adjust the brightness of the LEDs and digital tubes by adjusting the main chip's I / O current (0-110mA adjustable).

[0034] The LED matrix module is arranged as follows, taking LED3, LED4, LED5, LED6, LED7, LED8, LED9, and LED10 as examples. After the LEDs are arranged side by side, the two ends of each LED are connected to the I / O ports of the signal terminals in sequence. One end of LED3 is connected to signal LED0 and the other end is connected to signal LED5. One end of LED4 is connected to signal LED1 and the other end is connected to signal LED5. One end of LED5 is connected to signal LED2 and the other end is connected to signal LED5. One end of LED6 is connected to signal LED3 and the other end is connected to signal LED5. One end of LED7 is connected to signal LED4 and the other end is connected to signal LED5. One end of LED8 is connected to signal LED4 and the other end is connected to signal LED5. One end of LED9 is connected to signal LED4 and the other end is connected to signal LED6. One end of LED10 is connected to signal LED4 and the other end is connected to signal LED7.

[0035] This module has a total of 56 endpoints connected to the LEDs. By repeating the connection as above, a matrix circuit structure is achieved. While achieving the same display effect through the newly designed traces, the display driver chip 74HC164 and eight 330-ohm current-limiting resistors are eliminated, resulting in a cost advantage and making PCB design simpler and faster.

[0036] In this embodiment, a zero-crossing detection circuit is also included, which includes:

[0037] Transistor Q3, the base of transistor Q3 is connected to the input voltage through resistors R11, R10 and R9 in sequence, the emitter receives a voltage, and the collector is connected to the main control unit U1.

[0038] When the input voltage is not at the zero-crossing point, transistor Q3 is turned on so that +5V is received by the main control unit U1 after being stepped down. At the zero point, transistor Q3 is turned off, so that the main control unit U1 can identify the zero-crossing point by detecting the voltage.

[0039] In this embodiment, a voltage detection circuit is also included, which includes:

[0040] Diode D5 is connected to resistor R11, and diode D5 is connected to the main control unit U1 in sequence through resistors R15, R17 and R18.

[0041] The resistor R17 is also connected to the diode D7.

[0042] The mains power is stepped down by a resistor and then collected by the main control unit U1 to detect the current voltage.

[0043] In this embodiment, a base plate temperature sensor circuit is also included, which includes:

[0044] Terminal CN1 is used to connect a temperature sensor;

[0045] One end of terminal CN1 receives a voltage, the other end is connected to diode D6, and the other end is also connected to the main control unit U1 through resistors R32 and R26 respectively.

[0046] It also includes a top temperature sensor circuit, which has the same structure and principle. By detecting the temperature change of the temperature sensor and the subsequent change in its resistance, the voltage acquisition of the main control unit U1 changes, thereby identifying the temperature change at that location.

[0047] In this embodiment, a relay control circuit is also included, which includes:

[0048] Relay REL1 has one conducting terminal connected to the voltage terminal and the other terminal connected to the heating terminal. One end of the coil terminal of relay REL1 is input with a voltage, and the other end is connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base is connected to the main control unit U1.

[0049] When the temperature is too high, transistor Q4 is turned off, which in turn de-energizes the relay and disconnects the heating element from operation.

[0050] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A display control circuit with LED dot matrix mode, characterized in that, include; The main control unit U1 is provided with at least eight I / O ports for driving LEDs; An LED matrix module is connected to the IO port, and the LED matrix module has multiple endpoints for connecting LEDs. The digital tube is connected to the IO port so that the main control unit U1 can drive both the LED matrix module and the digital tube simultaneously.

2. The display control circuit with LED dot matrix mode according to claim 1, characterized in that: The LED matrix module has an area for connecting the internal circuitry of the digital tube.

3. The display control circuit with LED dot matrix mode according to claim 2, characterized in that: The LEDs include at least LED3, LED4, LED5, LED6, LED7, LED8, LED9, and LED10. One end of LED3 is connected to signal LED0, and the other end is connected to signal LED5. One end of LED4 is connected to signal LED1, and the other end is connected to signal LED5. One end of LED5 is connected to signal LED2, and the other end is connected to signal LED5. LED6 is connected to signal LED3, and the other end is connected to signal LED5. LED7 is connected to signal LED4, and the other end is connected to signal LED5. One end of LED8 is connected to signal LED4, and the other end is connected to signal LED5. One end of LED9 is connected to signal LED4, and the other end is connected to signal LED6. One end of LED10 is connected to signal LED4, and the other end is connected to signal LED7.

4. The display control circuit with LED dot matrix mode according to claim 1, characterized in that: It also includes a zero-crossing detection circuit, which includes; Transistor Q3, the base of transistor Q3 is connected to the input voltage through resistors R11, R10 and R9 in sequence, the emitter receives a voltage, and the collector is connected to the main control unit U1.

5. A display control circuit with LED dot matrix mode according to claim 4, characterized in that: It also includes a voltage detection circuit, which includes; Diode D5 is connected to resistor R11, and diode D5 is connected to the main control unit U1 in sequence through resistors R15, R17 and R18. The resistor R17 is also connected to the diode D7.

6. A display control circuit with LED dot matrix mode according to claim 4, characterized in that: It also includes a base plate temperature sensor circuit, which includes; Terminal CN1 is used to connect a temperature sensor; One end of terminal CN1 receives a voltage, the other end is connected to diode D6, and the other end is also connected to the main control unit U1 through resistors R32 and R26 respectively.

7. A display control circuit with LED dot matrix mode according to claim 1, characterized in that: It also includes a relay control circuit, which includes; Relay REL1 has one conducting terminal connected to the voltage terminal and the other terminal connected to the heating terminal. One end of the coil of relay REL1 is input with a voltage, and the other end is connected to the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base is connected to the main control unit U1.

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