Liquid crystal instrument capable of collecting multipath tri-state signals
By designing an LCD instrument capable of acquiring multiple tri-state signals and utilizing the CH423S chip to expand the I/O ports, tri-state judgment and power protection are achieved, solving the problems of insufficient MCU pins and single I/O port judgment, and improving the functional expandability and security of the LCD instrument.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-03-03
AI Technical Summary
The lack of pins in existing automotive MCUs and the fact that ordinary I/O ports can only determine high and low levels limits the expansion of LCD instrument panel functions.
The instrument uses an LCD that can acquire multiple tri-state signals and includes a main controller, LCD circuit, switch input circuit, CAN bus communication circuit, power output circuit and signal output circuit. It uses CH423S chip to expand the I/O ports to realize tri-state judgment and is equipped with current detection and short circuit protection functions.
The main controller's I/O resources have been expanded, enabling flexible input status control, meeting the needs of multi-channel signal acquisition, and improving the instrument's functional expandability and safety through power protection in accordance with ISO7637 standards.
Smart Images
Figure CN223966833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a module with CAN communication function, power output, and analog input, and more particularly to an LCD instrument that can acquire multiple tri-state signals. Background Technology
[0002] With the rapid development of automotive CAN bus technology, more and more vehicles are equipped with control modules featuring CAN bus communication capabilities, achieving convenience, flexibility, and reliability in vehicle control. However, some common problems exist with current color LCD instrument panels:
[0003] 1. As automobiles become increasingly feature-rich, there is a shortage of MCU pins.
[0004] 2. The limitation of ordinary I / O ports is that they can only determine high and low levels. Utility Model Content
[0005] This invention provides a liquid crystal instrument capable of acquiring multiple tri-state signals, thereby solving the technical problems existing in the prior art.
[0006] To achieve the above objectives, this utility model provides a liquid crystal instrument capable of acquiring multiple tri-state signals, comprising: a main controller and a liquid crystal circuit connected to the main controller, a switch quantity acquisition input circuit, a CAN bus communication circuit, a power output circuit, a power supply circuit, and a signal chip output circuit.
[0007] A liquid crystal circuit includes an interconnected liquid crystal driving circuit and a liquid crystal display circuit.
[0008] The digital input acquisition circuit provides multiple configurable tri-state input circuits, which can configure the acquired input signal to one of the following states: positive control state, negative control state, or floating state.
[0009] The power output circuit has current detection and short-circuit protection functions.
[0010] The signal output circuit has an I / O expansion chip, which can control the indicator LEDs on the instrument signal chip to turn on and off.
[0011] In one embodiment of this utility model, the liquid crystal display circuit has a 16-bit color liquid crystal screen with adjustable brightness.
[0012] In one embodiment of this utility model, the power supply circuit adopts a linear power supply.
[0013] In one embodiment of this utility model, the IO expansion chip is a CH423S chip.
[0014] In one embodiment of this utility model, the main controller is a GD32F470 chip.
[0015] The LCD instrument capable of acquiring multiple tri-state signals provided by this utility model has the following advantages:
[0016] (1) By using the CH423S expansion chip, the general input and output pins of the main controller can be expanded, avoiding the situation of insufficient chip IO resources;
[0017] (2) This utility model can flexibly control the input state of the extended input port, thereby realizing the three-state judgment of the input port;
[0018] (3) Special protection has been provided for the power supply circuit to ensure that the product complies with the ISO7637 standard. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of a liquid crystal instrument capable of acquiring multiple tri-state signals according to an embodiment of the present invention;
[0021] Figure 2 This is a circuit diagram of the switch quantity acquisition input circuit in this utility model. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Figure 1 This is a schematic diagram of the structure of a liquid crystal instrument capable of acquiring multiple tri-state signals according to an embodiment of the present invention, as shown below. Figure 1 As shown, the liquid crystal instrument capable of acquiring multiple tri-state signals provided by this utility model includes: a main controller 1 and a liquid crystal circuit 2 connected to the main controller 1, a switch quantity acquisition input circuit 3, a CAN bus communication circuit 4, a power output circuit 5, a power supply circuit 6, and a signal chip output circuit 7.
[0024] The liquid crystal circuit 2 includes a liquid crystal driving circuit 21 and a liquid crystal display circuit 22 that are interconnected.
[0025] The digital input acquisition circuit 3 provides multiple configurable tri-state input circuits, which can configure the acquired input signal to one of the following states: positive control state, negative control state, or floating state.
[0026] Power output circuit 5 has current detection and short-circuit protection functions.
[0027] The signal output circuit 7 has an IO expansion chip, which can control the indicator LEDs on the instrument signal chip to turn on and off.
[0028] The color LCD instrument provided by this invention also has 7 independent analog signal acquisition channels, which can be used to acquire analog signals such as voltage, air pressure, and fuel level, and can display the acquired analog signals in real time. This invention can receive power output control messages via the CAN bus and send the acquired analog signal information to the CAN network, sharing vehicle body data with other ECU unit modules on the CAN network.
[0029] In one embodiment of the present invention, the liquid crystal display circuit 22 has a 16-bit color liquid crystal screen with adjustable brightness.
[0030] In one embodiment of this utility model, the power supply circuit 6 adopts a linear power supply.
[0031] In one embodiment of this utility model, the IO expansion chip is a CH423S chip.
[0032] In one embodiment of this utility model, the main controller 1 is a GD32F470 chip.
[0033] Figure 2 The circuit diagram of the switch quantity acquisition input circuit in this utility model is as follows: Figure 2 As shown, when the input pin is set to active high, the control pin needs to be configured to low. In this case, according to the circuit diagram, there is no pull-up resistor at the input terminal; therefore, the acquisition terminal can only be high when the input terminal is high. When the input pin is set to active low, the control pin needs to be configured to high. In this case, the input terminal has a 12V pull-up resistor; therefore, the acquisition terminal can only be low when the input terminal is low. When the input pin is set to active floating, it is valid as long as the acquisition terminal and control terminal levels are consistent.
[0034] This utility model features a 4-channel I / O expansion chip, paired with... Figure 2 The circuit shown fulfills the functional requirement of acquiring multiple three-state switching signals. It has three power outputs and one high-level PWM output. All power outputs are protected against short circuits and overcurrents to ensure the safety of the module and the load.
[0035] This invention uses GigaDevice's 32-bit processor as the control core and GigaDevice's automotive-grade intelligent power devices as the power output control core, achieving refined control of the instrument panel via messages, which is beneficial to driving safety. It also features a rich array of interface circuits, meeting the body control requirements of most vehicle models.
[0036] The LCD instrument capable of acquiring multiple tri-state signals provided by this utility model has the following advantages:
[0037] (1) By using the CH423S expansion chip, the general input and output pins of the main controller can be expanded, avoiding the situation of insufficient chip IO resources;
[0038] (2) This utility model can flexibly control the input state of the extended input port, thereby realizing the three-state judgment of the input port;
[0039] (3) Special protection has been provided for the power supply circuit to ensure that the product complies with the ISO7637 standard.
[0040] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this utility model.
[0041] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A liquid crystal instrument capable of acquiring multiple three-state signals, characterized in that, include: The main controller, along with the connected LCD circuit, digital input circuit, CAN bus communication circuit, power output circuit, power supply circuit, and signal output circuit, A liquid crystal circuit includes an interconnected liquid crystal driving circuit and a liquid crystal display circuit. The digital input acquisition circuit provides multiple configurable tri-state input circuits, which can configure the acquired input signal to one of the following states: positive control state, negative control state, or floating state. The power output circuit has current detection and short-circuit protection functions. The signal output circuit has an I / O expansion chip, which can control the indicator LEDs on the instrument signal chip to turn on and off.
2. The liquid crystal instrument capable of acquiring multiple tri-state signals according to claim 1, characterized in that, The liquid crystal display circuit has a 16-bit color liquid crystal screen with adjustable brightness.
3. The liquid crystal instrument capable of acquiring multiple tri-state signals according to claim 1, characterized in that, The power supply circuit uses a linear power supply.
4. The liquid crystal instrument capable of acquiring multiple tri-state signals according to claim 1, characterized in that, The I / O expansion chip is the CH423S chip.
5. The liquid crystal instrument capable of acquiring multiple tri-state signals according to claim 1, characterized in that, The main controller is a GD32F470 chip.