Portable touch instrument mainboard

Abstract

The utility model provides a portable touch control instrument mainboard, and belongs to the field of embedded electronic equipment hardware. The mainboard comprises a single-chip microcomputer minimum system, an expansion module, a TFT display module, a storage module, a TFT backlight driving module, a power conversion module, a touch control module, an auxiliary module and a BOOT setting module. According to the utility model, the problems of poor use experience feeling caused by low integration level, low portability, high cost and the like of other instrument displays at present are solved, necessary modules are integrated together, so that the instrument display function is completed, and the instrument has the characteristics of portability, high integration level, friendly man-machine interaction and the like at the same time; the device can be freely assembled on various instruments by means of an expansion interface so as to meet the operation requirements in a moving state or a space-limited environment.

Description

Technical Field

[0001] This utility model relates to the field of embedded electronic device hardware design, and in particular to a portable touch instrument motherboard. Background Technology

[0002] With the development of embedded electronic device technology, the industry's demand for portable smart meters is growing, requiring a hardware product to realize such functions. Currently, many other such products have low integration, poor portability, and high cost, resulting in a poor user experience. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the portable touch instrument motherboard provided by this utility model is used to overcome the above-mentioned defects in the prior art.

[0004] The technical solution adopted in this utility model is as follows:

[0005] The portable touch instrument motherboard includes a single-chip microcomputer minimum system, an expansion module, a TFT display module, a storage module, a TFT backlight driver module, a power conversion module, a touch control module, an auxiliary module, and a BOOT setting module;

[0006] Furthermore, the minimum system of a microcontroller includes an MCU chip and a core circuit. The power supply port of the MCU chip is connected to a +3.3V power supply and ground; the clock port is connected to an 8MHz crystal oscillator and a 32.768kHz crystal oscillator respectively; the reset port is connected to a +3.3V power supply through a pull-up resistor; and the SWD connector of the debug interface is connected to a header.

[0007] Furthermore, the expansion module includes an 8-pin header and a 12-pin header. The 8-pin header leads out the SWD debugging interface and serial port 1, while the 12-pin header leads out the TFT display module and the touch screen.

[0008] Furthermore, the TFT display module is connected to the MCU, +3.3V power supply, ground, and the signal port of the touch screen control module; the TFT backlight driving module circuit includes an NPN transistor, a base current limiting resistor, and an LED loop resistor. The base of the transistor is connected to the microcontroller through a resistor, the collector is connected to the TFT display module through a resistor, and the emitter is grounded.

[0009] Furthermore, the storage module includes a TF card interface circuit and an SPI Flash circuit. The TF card interface is connected to the MCU, and the chip select terminal of the YAO25Q64SN chip of the SPI Flash is connected to the MCU.

[0010] Furthermore, the YAO1117ST-3.3 chip of the power conversion module has a VIN port USB interface and a +5V power supply, and a TAB port outputs a +3.3V voltage and indicates the power status via LEDs;

[0011] Furthermore, the chip clock, chip select, data input / output, and interrupt ports of the touch control module are connected to the MCU, and the X+ / Y+ / X- / Y- ports are connected to the touch screen electrodes.

[0012] Furthermore, the auxiliary module includes a button circuit and an LED indicator circuit. The reset button SW1 is directly connected to NRST, and the WAKEUP button SW2 is connected to the MCU. LED1 is connected to the MCU to indicate the system status. The BOOT setting module is connected to the MCU, +3.3V power supply, and ground for programming mode.

[0013] In one embodiment, the USB interface and the TF card interface are respectively positioned upwards, with their upper surfaces located above the upper surface of the substrate; the YAO25Q64SN chip is located to the left of the TF card interface and to the right of the YAO1117ST-3.3 chip; the YAO32F103Q48 chip is located below the YAO1117ST-3.3 chip; the BOOT setting module is located below the YAO25Q64SN chip; the NPN transistor is located below the TF card interface and above the touch screen control module; the leftmost side of the substrate has an 8-pin header; and the rightmost side of the substrate has a 12-pin header.

[0014] Compared with the prior art, the portable touch instrument motherboard provided by this utility model has the following advantages:

[0015] The motherboard proposed in this utility model integrates a single-chip microcomputer minimum system, an expansion module, a TFT display module, a storage module, a TFT backlight driving module, a power conversion module, a touch control module, an auxiliary module, and a BOOT setting module. By integrating the necessary modules together, it can perform instrument display functions while also being portable, highly integrated, and having a user-friendly human-machine interface. It can be arbitrarily assembled on various instruments with the help of expansion interfaces to meet the operational needs in mobile or space-constrained environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 This is the circuit diagram of the minimum system for a single-chip microcomputer.

[0018] Figure 3 To expand the module circuit diagram.

[0019] Figure 4 This is a circuit diagram of a TFT display module.

[0020] Figure 5 This is the circuit diagram for the storage module.

[0021] Figure 6This is a circuit diagram of a TFT backlight driving module.

[0022] Figure 7 This is the circuit diagram for the power conversion module.

[0023] Figure 8 This is the circuit diagram for the touch control module.

[0024] Figure 9 This is the circuit diagram for the auxiliary module.

[0025] Figure 10 Configure the module circuit diagram for BOOT. Detailed Implementation

[0026] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this disclosure and to fully convey its scope to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0027] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art to which this invention pertains. In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms “connection”, “linked,” etc., should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium. The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] like Figure 1 As shown, for ease of description, the orientation references of "up", "down", "left", "right", "front" and "rear" in this utility model are attached. Figure 1 The orientation shown is for reference; the portable touch instrument motherboard includes a rectangular substrate 1. On one side of the substrate 1, electrically connected to each other via printed circuits are a YAO32F103Q48 chip 2, an 8-pin header 3, a USB interface 4, a YAO1117ST-3.3 chip 5, a YAO25Q64SN chip 6, a TF card interface 7, a 12-pin header 8, an NPN transistor 9, a touch screen control module 10, and a BOOT setting module 11. The USB interface and the TF card interface are respectively positioned upwards, with their upper surfaces located above the upper surface of the substrate. The YAO25Q64SN chip is located to the left of the TF card interface and to the right of the YAO1117ST-3.3 chip. The YAO32F103Q48 chip is located below the YAO1117ST-3.3 chip. The BOOT setting module is located below the YAO25Q64SN chip. The NPN transistor is located below the TF card interface and above the touch screen control module.

[0030] like Figure 2 As shown, the MCU of the minimum system is YAO32F103Q48. Its OSC_IN pin is connected to the first terminal of the 8MHz crystal oscillator X1, and its OSC_OUT pin is connected to the second terminal of X1. A first 22pF capacitor C8 is connected between the OSC_IN pin and ground, and a second 22pF capacitor C9 is connected between the OSC_OUT pin and ground. The OSC32_IN pin is connected to the first terminal of the 32.768kHz crystal oscillator X6, and its OSC32_OUT pin is connected to the second terminal of X6. A first 10pF capacitor C12 is connected between the OSC32_IN pin and ground, and a second 10pF capacitor C13 is connected between the OSC32_OUT pin and ground.

[0031] like Figure 3 As shown, the expansion module includes an 8-pin header and a 12-pin header. The 8-pin header leads out the SWD debugging interface and serial port 1, and the 12-pin header leads out the TFT display module and the touch screen.

[0032] like Figure 4 As shown, the SDA pin of the TFT display module is connected to the PA7 pin of the MCU, the SCL pin is connected to the PA5 pin, the CSK pin is connected to the PB1 pin, the DCX pin is connected to the PB11 pin, the RESX pin is connected to the PB10 pin, and the X+, Y+, X-, and Y- pins are respectively connected to the corresponding electrode pins of the touch control module.

[0033] like Figure 5 As shown, the storage module includes a TF card interface circuit and an SPI Flash circuit. The chip select terminal of the TF card slot CARD1 is connected to the PB0 pin of the MCU, the clock terminal is connected to the PB13 pin, the command terminal is connected to the PB15 pin, the data terminal is connected to the PB14 pin, and the card detection terminal is connected to the PA2 pin. The SPI Flash chip model is YAO25Q64SN, and its chip select terminal is connected to the PB12 pin of the MCU, the clock terminal is connected to the PB13 pin, the data input terminal is connected to the PB15 pin, and the data output terminal is connected to the PB14 pin.

[0034] like Figure 6 As shown, the TFT backlight driving module circuit includes an NPN transistor, a base current limiting resistor, and an LED loop resistor. The base of the transistor is connected to the microcontroller through a resistor, the collector is connected to the TFT display module through a resistor, and the emitter is grounded.

[0035] like Figure 7 As shown, the power conversion module uses a YAO1117ST-3.3 chip. Its VIN pin is connected to the 5V power supply of the USB interface, and its VOUT pin outputs a 3.3V system voltage. An electrolytic capacitor and a ceramic capacitor are connected in parallel between the VIN pin and ground, and an electrolytic capacitor and a ceramic capacitor are also connected in parallel between the VOUT pin and ground.

[0036] like Figure 8 As shown, the DOUT pin of the touch control module chip is connected to the PA6 pin of the MCU, the PENIRQ pin is connected to the PB10 pin, and the X+, Y+, X-, and Y- pins are connected to the corresponding electrode pins of the TFT display module.

[0037] like Figures 9 to 10 As shown, the auxiliary module includes a button circuit and an LED indicator circuit. The reset button SW1 is directly connected to NRST, and the WAKEUP button SW2 is connected to the MCU. LED1 is connected to the MCU to indicate the system status. The BOOT setting module is connected to the MCU, +3.3V power supply, and ground for programming mode.

[0038] The portable touch instrument motherboard is powered off during program burning, with the BOOT0 jumper cap connected to 3.3V; the debugger is connected to the SWCLK / SWDIO pins of header U2; after power-on, it boots from the system memory area and burns the firmware to the Flash main memory area; after completion, the jumper cap is removed; the PLL is configured to multiply the 8MHz crystal oscillator to a 72MHz system clock; the SPI1 clock is set to 18MHz, and GPIO is initialized; the character library is loaded from the SPI Flash; PB10 is set low for 200ms to reset the TFT, and commands 0x11 and 0x29 are sent to initialize the screen, thus completing the system power-on initialization; the touch calibration displays a four-point target, records the coordinates, calculates the transformation matrix, and stores it in the SPI. Flash memory; during data acquisition, touch interrupt triggers coordinate reading and writing to the TF card; backlight brightness is controlled by adjusting the PWM duty cycle of PB10; during operation, the MCU controls SPI time-division multiplexing in the following order: first, PB1 pin is set low and PB11 pin is set low, and a command is sent to the TFT display module U4 through PA7 pin; then, PB11 pin is set high to send display data; after completion, PB1 pin is set high again and PA3 pin is set low, and an instruction is sent to the touch control module through PA7 pin. Multiplexing conflicts on the PB10 pin are avoided through time-division operation: after the RESX pin is reset, backlight control is enabled, and the PENIRQ interrupt is set to fall-edge trigger.

[0039] This invention solves the problems of low integration, poor portability, and high cost of other current instrument displays, which result in a poor user experience. By integrating the necessary modules together, it can complete the instrument display function while also being portable, highly integrated, and having a user-friendly human-computer interaction. It can be arbitrarily assembled on various instruments with the help of expansion interfaces to meet the operational needs in mobile or space-constrained environments.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A portable touch-screen instrument motherboard, characterized in that, The portable touch instrument motherboard includes a single-chip microcomputer minimum system, an expansion module, a TFT display module, a storage module, a TFT backlight driving module, a power conversion module, a touch control module, an auxiliary module, and a BOOT setting module, all mounted on the same rectangular substrate. These modules are electrically connected to each other via printed circuits. The single-chip microcomputer minimum system uses a YAO32F103Q48 MCU, with its first SPI port time-multiplexed to connect the TFT display module and the touch control module, and its second SPI port connected to the storage module. The power conversion module uses a YAO1117ST-3.3 chip, with VIN connected to a 5V power supply and VOUT outputting 3.3V.

2. The portable touch-screen instrument motherboard according to claim 1, characterized in that, The TFT backlight driving module includes an NPN transistor, a base current limiting resistor, and an LED circuit resistor; the base of the transistor is connected to the microcontroller through a resistor, the collector is connected to the TFT display module through a resistor, and the emitter is grounded.

3. The portable touch-screen instrument motherboard according to claim 1, characterized in that, The storage module includes a TF card interface circuit and an SPI Flash circuit; the SPI Flash circuit uses a YAO25Q64SN chip, and its chip select terminal is connected to the MCU.

4. The portable touch-screen instrument motherboard according to claim 1, characterized in that, The expansion module includes an 8-pin header and a 12-pin header; the 8-pin header leads out the SWD debugging interface and serial port 1; the 12-pin header leads out the TFT display module and the touch screen.

5. The portable touch-screen instrument motherboard according to claim 1, characterized in that, The touch control module's chip clock, chip select, data input / output, and interrupt ports are connected to the MCU, and the X+ / Y+ / X- / Y- ports are connected to the touchscreen electrodes. The auxiliary module includes a button circuit and an LED indicator circuit. The reset button SW1 is directly connected to NRST, and the WAKEUP button SW2 is connected to the MCU. LED1 is connected to the MCU to indicate the system status. The BOOT setting module is connected to the MCU, +3.3V power supply, and ground for programming mode.

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