Minimum system circuit for driving TFT (Thin Film Transistor) liquid crystal screen by using domestic singlechip

Abstract

The utility model discloses a minimum system circuit for driving a TFT (thin film transistor) liquid crystal screen by using a domestic single-chip microcomputer, which comprises a single-chip microcomputer minimum system circuit: building the domestic single-chip microcomputer minimum system circuit, and adding a control pin for the TFT liquid crystal screen on the basis of the domestic single-chip microcomputer minimum system circuit; the LDO voltage reduction circuit adopts an LDO chip to reduce the voltage of 5V direct current input by power supply to fixed 3.3 V direct current, and the fixed 3.3 V direct current is supplied to the single chip microcomputer and the TFT liquid crystal screen interface; and the TFT liquid crystal screen interface protection circuit is connected in parallel with a unidirectional TVS diode at a position where the pin of the single chip microcomputer is connected with the TFT liquid crystal screen interface. According to the circuit, the domestic single chip microcomputer and other components are adopted, replacement of imported components is achieved, the purchase cost of the circuit is reduced, and the uncertainty of a supply chain is reduced; through the well-designed circuit architecture, the circuit structure is simplified to the greatest extent and the number of electronic components is reduced while the functional integrity is maintained, so that the complexity and the manufacturing cost of the circuit are reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of TFT liquid crystal screen circuit, and particularly relates to a minimum system circuit for driving a TFT liquid crystal screen by using a localized single-chip microcomputer. BACKGROUND

[0002] At present, in the industrial control field, TFT liquid crystal screens are widely used on various devices to display content. With the increasing demand for localization, it has become a trend to design circuits by using localized components. Traditional TFT liquid crystal screen driving circuits usually use imported single-chip microcomputers and a series of complex peripheral circuits, which not only increases the size and cost of the device, but also limits the flexibility and scalability of the device to some extent. In addition, due to the uncertainty of the supply chain of imported components, localization replacement has become an important research direction.

[0003] However, in the process of realizing localization replacement, many challenges are faced. For example, how to ensure that the localized single-chip microcomputer can stably and efficiently drive the TFT liquid crystal screen while maintaining the simplicity and cost-effectiveness of the circuit is a problem that needs to be solved at present. Therefore, it is necessary to design a minimum system circuit for driving a TFT liquid crystal screen by using a localized single-chip microcomputer to meet the demand for miniaturization, low cost and high reliability of the device in the industrial control field. SUMMARY

[0004] Therefore, the application provides a minimum system circuit for driving a TFT liquid crystal screen by using a localized single-chip microcomputer to solve the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the application provides the following technical scheme:

[0006] A minimum system circuit for driving a TFT liquid crystal screen by using a localized single-chip microcomputer, comprising: a single-chip microcomputer minimum system circuit: a localized single-chip microcomputer minimum system circuit is built, and control pins for the TFT liquid crystal screen are added on the basis of the localized single-chip microcomputer minimum system circuit, and specifically comprising:

[0007] Model AT32F403ACGT7 single-chip computer 1 foot connection second 100nF end of the patch capacitor, together with the 3.3V network, single-chip computer 2, 3, 4 foot in the air, single-chip computer 5 foot OSC-IN network, single-chip computer 6 foot OSC-OUT network, single-chip computer 7 foot NRST network, single-chip computer 8 foot GND network, single-chip computer 9 foot 3.3V network, single-chip computer 10 foot in the air, single-chip computer 11 foot SCL network, single-chip computer 12 foot SDA network, single-chip computer 13 foot RES network, single-chip computer 14 foot DC network, single-chip computer 15 foot CS network, single-chip computer 16 foot BLK network, single-chip computer 17, 18, 19, 20, 21 foot in the air, 22 foot RUN network, single-chip computer 23 foot GND network, single-chip computer 24 foot 3.3V network, single-chip computer 25, 26, 27, 28, 29, 30, 31, 32, 33 foot in the air, single-chip computer 34 foot SWDIO network, single-chip computer 35 foot GND network, single-chip computer 36 foot 3.3V network, single-chip computer 37 foot SWCLK network, single-chip computer 38, 39, 40, 41, 42, 43 foot in the air, single-chip computer 44 foot one end of the second 10K patch resistor, single-chip computer 45, 46 foot in the air, single-chip computer 47 foot GND network, single-chip computer 48 foot 3.3V network;

[0008] Second 100nF patch capacitor one end of the GND network; one end of the second 10K patch resistor GND network; one end of the fifth 10K patch resistor 3.3V network, the other end of the first patch LED lamp anode; the first patch LED lamp cathode RUN network; 1 foot patch passive crystal oscillator one end of the first 12pF patch capacitor, one end of the 1M patch resistor, together with the OSC-IN network, 2 foot patch passive crystal oscillator GND network, 3 foot patch passive crystal oscillator one end of the first 12pF patch capacitor, one end of the 1M patch resistor, together with the OSC-OUT network, 4 foot patch passive crystal oscillator GND network;

[0009] One end of the first 10K patch resistor 3.3V network, the other end of the first 100nF patch capacitor one end of the common connection NRST network, the first 100nF patch capacitor one end of the GND network; 1 foot electronic connector one end of the third 10K patch resistor, together with the 3.3V network, 2 foot electronic connector SWDIO network, one end of the third 10K patch resistor, 3 foot electronic connector SWCLK network, one end of the fourth 10K patch resistor, 4 foot electronic connector one end of the fourth 10K patch resistor, together with the GND network;

[0010] Another end of the 10 100nF patch capacitors is commonly connected to the 3.3V network.

[0011] The LDO voltage reduction circuit adopts one LDO chip to reduce the 5V DC power input to a fixed 3.3V DC power for the single-chip microcomputer and the TFT liquid crystal screen interface.

[0012] The TFT liquid crystal screen interface protection circuit is connected to the TFT liquid crystal screen interface at the single-chip microcomputer pin and is connected in parallel with a unidirectional TVS diode for protecting the single-chip microcomputer.

[0013] Optionally, the LDO voltage reduction circuit specifically comprises:

[0014] The 1 pin of the first electronic connector is connected to the 5V network, and the 2 pin of the first electronic connector is connected to the GND network.

[0015] The 1 pin of the LDO chip with the model AMS1117-3V3 is connected to the first 100nF patch capacitor, the first 10uF patch capacitor, the anode of the first unidirectional TVS diode with the model SMAJ5.0A, and the GND network.

[0016] The 2 pin of the LDO chip is connected to the 4 pin of the LDO chip, the second 10uF patch capacitor, the fourth 100uF patch capacitor, the anode of the second unidirectional TVS diode with the model SMAJ3.3A, and the 3.3V network.

[0017] The 3 pin of the LDO chip is connected to the first 100nF patch capacitor, the first 10uF patch capacitor, the cathode of the first unidirectional TVS diode with the model SMAJ5.0A, and the 5V network.

[0018] Optionally, one end of the second 10uF patch capacitor and the fourth 100uF patch capacitor is connected to the GND network; the anode of the second unidirectional TVS diode with the model SMAJ3.3A is connected to the GND network; the anode of the second patch LED lamp is connected to the 3.3V network, and the cathode is connected to one end of the sixth 10K patch resistor; one end of the sixth 10K patch resistor is connected to the GND network.

[0019] Optionally, the TFT liquid crystal screen interface protection circuit specifically comprises:

[0020] Pin 1 of the second electronic connector is connected to the GND network; pin 2 of the second electronic connector is connected to the 3.3V network; pin 3 of the second electronic connector is connected to the cathode of the third unidirectional TVS diode (model SMF3.3A), and both are connected to the SCL network; pin 4 of the second electronic connector is connected to the cathode of the fourth unidirectional TVS diode (model SMF3.3A), and both are connected to the SDA network; pin 5 of the second electronic connector is connected to the cathode of the fifth unidirectional TVS diode (model SMF3.3A), and both are connected to the RES network; pin 6 of the second electronic connector is connected to the cathode of the sixth unidirectional TVS diode (model SMF3.3A), and both are connected to the DC network; pin 7 of the second electronic connector is connected to the cathode of the seventh unidirectional TVS diode (model SMF3.3A), and both are connected to the CS network; pin 8 of the second electronic connector is connected to the cathode of the eighth unidirectional TVS diode (model SMF3.3A), and both are connected to the BLK network.

[0021] Optionally, the anodes of the third, fourth, fifth, sixth, seventh, and eighth unidirectional TVS diodes are connected to the GND network.

[0022] Compared with the prior art, this application has at least the following beneficial effects:

[0023] This circuit uses domestically produced microcontrollers and other components, achieving the substitution of imported components, reducing the procurement cost of the circuit, and reducing supply chain uncertainty. Through a carefully designed circuit architecture, this circuit simplifies the circuit structure to the maximum extent while maintaining functional integrity, reducing the number of electronic components, thereby reducing the complexity and manufacturing cost of the circuit. Attached Figure Description

[0024] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0025] Figure 1 This application provides an overall architecture diagram of a minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller.

[0026] Figure 2 The present application provides a minimum system circuit diagram of a microcontroller for driving a TFT LCD screen using a domestically produced microcontroller;

[0027] Figure 3 This application provides a minimum system circuit diagram of an LDO step-down circuit for driving a TFT LCD screen using a domestically produced microcontroller;

[0028] Figure 4 This application provides a minimum system circuit diagram for the TFT LCD screen interface protection circuit, which uses a domestically produced microcontroller to drive the TFT LCD screen. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This invention provides a minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller, such as... Figure 1 As shown, it includes: a microcontroller minimum system circuit: this part of the circuit builds a set of domestic microcontroller minimum system circuits, and adds control pins for the TFT LCD screen on its basis.

[0031] like Figure 2 As shown, pin 1 of the AT32F403ACGT7 microcontroller (U1) is connected to one end of the second 100nF surface-mount capacitor (C49), both connected to the 3.3V network. Pins 2, 3, and 4 are left unconnected (floating). Pin 5 is connected to the OSC-IN network, pin 6 to the OSC-OUT network, pin 7 to the NRST network, pin 8 to the GND network, pin 9 to the 3.3V network, pin 10 is left unconnected (floating), pin 11 to the SCL network, pin 12 to the SDA network, pin 13 to the RES network, pin 14 to the DC network, pin 15 to the CS network, pin 16 to the BLK network, and pins 17, 18, 19, and 2... Pins 0 and 21 are left unconnected (floating). Pin 22 is connected to the RUN network. Pin 23 is connected to the GND network. Pin 24 is connected to the 3.3V network. Pins 25, 26, 27, 28, 29, 30, 31, 32, and 33 are left unconnected (floating). Pin 34 is connected to the SWDIO network. Pin 35 is connected to the GND network. Pin 36 is connected to the 3.3V network. Pin 37 is connected to the SWCLK network. Pins 38, 39, 40, 41, 42, and 43 are left unconnected (floating). Pin 44 is connected to one end of the second 10K SMD resistor R27. Pins 45 and 46 are left unconnected (floating). Pin 47 is connected to the GND network. Pin 48 is connected to the 3.3V network.

[0032] One end of the second 100nF surface mount capacitor (C49) is connected to the GND network; one end of the second 10K surface mount resistor (R27) is connected to the GND network; one end of the fifth 10K surface mount resistor (R30) is connected to the 3.3V network, and the other end is connected to the anode of the first surface mount LED (LED1); the cathode of the first surface mount LED (LED1) is connected to the RUN network; pin 1 of the surface mount passive crystal oscillator (X1) is connected to the first 12pF surface mount capacitor (C46). One end is connected to one end of the 1M SMD resistor R25, which together connects to the OSC-IN network. Pin 2 of the X1 SMD passive crystal oscillator is connected to the GND network. Pin 3 of the X1 SMD passive crystal oscillator is connected to one end of the first 12pF SMD capacitor C47, which is then connected to one end of the 1M SMD resistor R25, and together they connect to the OSC-OUT network. Pin 4 of the X1 SMD passive crystal oscillator is connected to the GND network. One end of the first 10K SMD resistor R26 is connected to... The 3.3V network is connected to the NRST network, with one end connected to one end of the first 100nF surface-mount capacitor (C48). One end of the first 100nF surface-mount capacitor (C48) is connected to the GND network. Pin 1 of the CN1 electronic connector is connected to one end of the third 10K surface-mount resistor (R28), also connected to the 3.3V network. Pin 2 of the CN1 electronic connector is connected to the SWDIO network, and then to one end of the third 10K surface-mount resistor (R28). Pin 3 of connector 1 is connected to the SWCLK network and one end of the fourth 10K SMD resistor R29. Pin 4 of connector CN1 is connected to one end of the fourth 10K SMD resistor R29, and both are connected to the GND network. One end of each of the ten 100nF SMD capacitors C50, C51, C52, C53, C54, C55, C56, C57, C58, and C61 is connected to the 3.3V network, and the other end is connected to the GND network.

[0033] LDO step-down circuit: This part uses an LDO chip to step down the 5V DC power input to a fixed 3.3V DC power to supply the microcontroller and TFT LCD screen interface.

[0034] like Figure 3As shown, pin 1 of the first electronic connector (JP1) is connected to the 5V network, and pin 2 is connected to the GND network. Pin 1 of the LDO chip (U2, model AMS1117-3V3) is connected to one end of the third 100nF surface-mount capacitor (C23) and the first 10uF surface-mount capacitor (C24), and is connected to the anode of the first unidirectional TVS diode (T1, model SMAJ5.0A), all connected to the GND network. Pins 2 and 4 of the LDO chip are connected to one end of the second 10uF surface-mount capacitor (C25) and the fourth 100uF surface-mount capacitor (C26), and are connected to the anode of the second unidirectional TVS diode (T8, model SMAJ3.3A). Connected to the 3.3V network, pin 3 of the LDO chip is connected to one end of the third 100nF SMD capacitor C23 and one end of the first 10uF SMD capacitor C24, and to the cathode of the first unidirectional TVS diode (model SMAJ5.0A) in tag T1, all connected to the 5V network; one end of the second 10uF SMD capacitor (model C25) and one end of the fourth 100uF SMD capacitor C26 are connected to the GND network; the anode of the second unidirectional TVS diode (model SMAJ3.3A) in tag T8 is connected to the GND network; the anode of the second SMD LED in tag D2 is connected to the 3.3V network, and the cathode is connected to one end of the sixth 10K SMD resistor in tag R7; one end of the sixth 10K SMD resistor in tag R7 is connected to the GND network.

[0035] TFT LCD screen interface protection circuit: This circuit connects a unidirectional TVS diode in parallel at the microcontroller pin connection to the TFT LCD screen interface to protect the microcontroller pin from external high voltage breakdown.

[0036] like Figure 4As shown, pin 1 of the second electronic connector (JP2) is connected to the GND network, pin 2 is connected to the 3.3V network, pin 3 is connected to the cathode of the third unidirectional TVS diode (T7, model SMF3.3A), and both are connected to the SCL network. Pin 4 is connected to the cathode of the fourth unidirectional TVS diode (T6, model SMF3.3A), and both are connected to the SDA network. Pin 5 is connected to the cathode of the fifth unidirectional TVS diode (T5, model SMF3.3A), and both are connected to the RES network. Pin 6 of the second electronic connector is connected to the cathode of the sixth unidirectional TVS diode (model SMF3.3A, tag number T4), and both are connected to the DC network. Pin 7 of the second electronic connector is connected to the cathode of the seventh unidirectional TVS diode (model SMF3.3A, tag number T3), and both are connected to the CS network. Pin 8 of the second electronic connector is connected to the cathode of the eighth unidirectional TVS diode (model SMF3.3A, tag number T2), and both are connected to the BLK network. The anodes of the unidirectional TVS diodes (model SMF3.3A, tags T2, T3, T4, T5, T6, and T7) are connected to the GND network.

[0037] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller, characterized in that, include: Minimum System Circuit for Microcontroller: A domestically produced minimum system circuit for a microcontroller was built, and control pins for the TFT LCD screen were added to it. Specifically, this includes: The AT32F403ACGT7 microcontroller has pin 1 connected to one end of a second 100nF surface-mount capacitor, both connected to the 3.3V network. Pins 2, 3, and 4 are left floating. Pin 5 is connected to the OSC-IN network, pin 6 to the OSC-OUT network, pin 7 to the NRST network, pin 8 to the GND network, pin 9 to the 3.3V network, pin 10 is left floating, pin 11 to the SCL network, pin 12 to the SDA network, pin 13 to the RES network, pin 14 to the DC network, pin 15 to the CS network, pin 16 to the BLK network, and pin 17... Pins 18, 19, 20, and 21 are left floating; pin 22 is connected to the RUN network; pin 23 of the microcontroller is connected to the GND network; pin 24 of the microcontroller is connected to the 3.3V network; pins 25, 26, 27, 28, 29, 30, 31, 32, and 33 of the microcontroller are left floating; pin 34 of the microcontroller is connected to the SWDIO network; pin 35 of the microcontroller is connected to the GND network; pin 36 of the microcontroller is connected to the 3.3V network; pin 37 of the microcontroller is connected to the SWCLK network; pins 38, 39, 40, 41, 42, and 43 of the microcontroller are left floating; pin 44 of the microcontroller is connected to one end of the second 10K surface mount resistor; pins 45 and 46 of the microcontroller are left floating; pin 47 of the microcontroller is connected to the GND network; pin 48 of the microcontroller is connected to the 3.3V network. One end of the second 100nF surface mount capacitor is connected to the GND network; one end of the second 10K surface mount resistor is connected to the GND network; one end of the fifth 10K surface mount resistor is connected to the 3.3V network, and the other end is connected to the anode of the first surface mount LED; the cathode of the first surface mount LED is connected to the RUN network; pin 1 of the surface mount passive crystal oscillator is connected to one end of the first 12pF surface mount capacitor and one end of the 1M surface mount resistor, and together they are connected to the OSC-IN network; pin 2 of the surface mount passive crystal oscillator is connected to the GND network; pin 3 of the surface mount passive crystal oscillator is connected to one end of the first 12pF surface mount capacitor and one end of the 1M surface mount resistor, and together they are connected to the OSC-OUT network; pin 4 of the surface mount passive crystal oscillator is connected to the GND network. One end of the first 10K SMD resistor is connected to the 3.3V network, and the other end is connected to one end of the first 100nF SMD capacitor, both connected to the NRST network. One end of the first 100nF SMD capacitor is connected to the GND network. Pin 1 of the electronic connector is connected to one end of the third 10K SMD resistor, both connected to the 3.3V network. Pin 2 of the electronic connector is connected to the SWDIO network, and connected to one end of the third 10K SMD resistor. Pin 3 of the electronic connector is connected to the SWCLK network, and connected to one end of the fourth 10K SMD resistor. Pin 4 of the electronic connector is connected to one end of the fourth 10K SMD resistor, both connected to the GND network. In addition, one end of each of the ten 100nF surface mount capacitors is connected to the 3.3V network, and the other end is connected to the GND network. The LDO step-down circuit uses one LDO chip to step down the 5V DC power input to a fixed 3.3V DC power to supply the microcontroller and TFT LCD screen interface. The TFT LCD screen interface protection circuit has a unidirectional TVS diode connected in parallel at the pin of the microcontroller connected to the TFT LCD screen interface to protect the microcontroller.

2. The minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller according to claim 1, characterized in that, The LDO step-down circuit specifically includes: Pin 1 of the first electronic connector is connected to the 5V network, and pin 2 of the first electronic connector is connected to the GND network. Pin 1 of the AMS1117-3V3 LDO chip is connected to one end of the third 100nF surface mount capacitor and the first 10uF surface mount capacitor, and is connected to the anode of the first unidirectional TVS diode of model SMAJ5.0A, and together they are connected to the GND network. Pins 2 and 4 of the LDO chip are connected to one end of the second 10uF surface mount capacitor and the fourth 100uF surface mount capacitor, and to the anode of the second unidirectional TVS diode of model SMAJ3.3A, which are connected to the 3.3V network. Pin 3 of the LDO chip is connected to one end of the third 100nF and the first 10uF surface-mount capacitor, and then to the cathode of the first unidirectional TVS diode (model SMAJ5.0A), all of which are connected to the 5V network.

3. The minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller according to claim 2, characterized in that, One end of the second 10uF surface mount capacitor and the fourth 100uF surface mount capacitor are connected to the GND network; the anode of the second unidirectional TVS diode (model SMAJ3.3A) is connected to the GND network; the anode of the second surface mount LED is connected to the 3.3V network, and the cathode is connected to one end of the sixth 10K surface mount resistor; one end of the sixth 10K surface mount resistor is connected to the GND network.

4. The minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller according to claim 1, characterized in that, The TFT LCD screen interface protection circuit specifically includes: Pin 1 of the second electronic connector is connected to the GND network; pin 2 of the second electronic connector is connected to the 3.3V network; pin 3 of the second electronic connector is connected to the cathode of the third unidirectional TVS diode (model SMF3.3A), and both are connected to the SCL network; pin 4 of the second electronic connector is connected to the cathode of the fourth unidirectional TVS diode (model SMF3.3A), and both are connected to the SDA network; pin 5 of the second electronic connector is connected to the cathode of the fifth unidirectional TVS diode (model SMF3.3A), and both are connected to the RES network; pin 6 of the second electronic connector is connected to the cathode of the sixth unidirectional TVS diode (model SMF3.3A), and both are connected to the DC network; pin 7 of the second electronic connector is connected to the cathode of the seventh unidirectional TVS diode (model SMF3.3A), and both are connected to the CS network; pin 8 of the second electronic connector is connected to the cathode of the eighth unidirectional TVS diode (model SMF3.3A), and both are connected to the BLK network.

5. The minimum system circuit for driving a TFT LCD screen using a domestically produced microcontroller according to claim 4, characterized in that, The anodes of the third, fourth, fifth, sixth, seventh, and eighth unidirectional TVS diodes are connected to the GND network.

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