Circuit of DLE chip

Abstract

The utility model discloses a circuit of a DLE chip, which is characterized in that a central controller MCU (1) is connected with an 8MHz crystal oscillator circuit unit (3) through a crystal oscillator signal input pin, and is connected with an E2 module unit (4) through a data signal input pin E2-SDA and a clock signal input pin E2-SCL; the central controller MCU (1) is connected with the backlight source module unit (5) through a PWM square wave signal input pin LED-PWM, and is connected with the CAN communication module unit (7) through a CAN signal input pin Rx-CAN. According to the utility model, the defects of complex structures of module units such as a D / A conversion chip, an RS232 serial port conversion circuit, a speed and distance measuring sensor, a stepping motor driving circuit and the like in the prior art are overcome, the power consumption of the instrument is reduced, the performance of the instrument is improved, the electronic circuit of the electric automobile instrument is simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle intelligent meters, and more specifically to a DLE chip circuit. Background Art

[0002] The dashboard of an electric car is an important tool for the driver to understand the vehicle's status and performance. They display various information in the form of icons, allowing the driver to easily understand the vehicle's operating status.

[0003] The significance of "Electric Vehicle Instruments" (GB / T 19836-2019) is to unify the differences between electric vehicles and traditional vehicles in terms of operation or use, which is of great significance for quickly switching driving vehicles and promoting the friendliness of vehicles to vehicle users. The standard takes into account many safety aspects and can promote the safe use of electric vehicles.

[0004] The Chinese patent with publication number CN101832798A discloses an electric vehicle intelligent meter, which includes a speed and distance measuring sensor, a central controller MCU (MSP430 series chip), a D / A conversion chip, a stepper motor drive circuit, a vehicle speed meter panel, an RS232 serial port conversion circuit, and an E2 (EEPROM) memory. The central controller MCU (MSP430 series chip) is respectively connected to the speed and distance measuring sensor, the D / A conversion chip, the RS232 serial port conversion circuit, and the E2 (EEPROM) memory, the D / A conversion chip is connected to the stepper motor drive circuit, and the stepper motor drive circuit is connected to the vehicle speed meter panel.

[0005] However, there are still some shortcomings, namely, module units such as speed and distance sensors, D / A conversion chips, and stepper motor drive circuits can be saved, and some circuits can be optimized to simplify the electronic circuits of electric vehicle instruments and reduce costs.

[0006] Therefore, a circuit is urgently needed to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology and to provide a circuit of a DLE chip.

[0008] The purpose of the utility model is implemented through the following technical scheme: a circuit of a DLE chip, which includes a central controller MCU, a key unit, an 8MHz crystal oscillator circuit unit, an E2 module unit, a backlight module unit, a buzzer module unit, a CAN communication module unit, a broken code LCD screen display interface unit and an indicator light module unit, the central controller MCU is connected to the key unit through a key signal input pin K1, the central controller MCU is connected to the buzzer module unit through a sound amplitude output pin SGOA and a sound frequency output pin SGOF,

[0009] The central controller MCU is connected to the 8MHz crystal oscillator circuit unit via the crystal oscillator signal input pin.

[0010] The central controller MCU is connected to the E2 module unit via the data signal input pin E2-SDA and the clock signal input pin E2-SCL.

[0011] The central controller MCU is connected to the backlight module unit via the PWM square wave signal input pin LED-PWM.

[0012] The central controller MCU is connected to the CAN communication module unit via the CAN signal input pin Rx-CAN, and the output end of the indicator light module unit is connected to the central controller MCU.

[0013] In the above technical solution: the key unit comprises a working voltage input pin VCC, a current limiting resistor R1 with a resistance of 10KΩ is connected in series to the working voltage input pin VCC, and a capacitor C1 is connected in series to the resistor R1.

[0014] In the above technical solution: the 8MHz crystal oscillator circuit unit includes two parallel capacitors C2 and C3.

[0015] In the above technical solution: the E2 module unit includes a working voltage input pin VCC, a capacitor C4 is connected in series to the working voltage input pin VCC, the capacitor C4 is divided into two paths and a current limiting resistor R2 and R3 with the same resistance value of 4.7KΩ are connected in series respectively, and the resistors R2 and R3 are connected in series with the E2 chip in two paths.

[0016] In the above technical solution: the backlight source module unit includes an operating voltage input pin VBAT, the operating voltage input pin VBAT is connected in series with a diode M7, the diode M7 is connected in series with a backlight signal processing chip E655, the backlight signal processing chip E655 is divided into two paths of series connection with resistors R4 and R5 with the same resistance value, the parallel resistors R4 and R5 are connected in series with a transistor Q5, the transistor Q5 is connected in series with a resistor R6, and the resistor R6 is connected in series with a resistor R7.

[0017] In the above technical solution: the buzzer module unit includes a voltage input pin VBAT, a sound amplitude input pin SGOA and a sound frequency input pin SGOF, the voltage input pin VBAT is connected in series with a diode M7, the diode M7 is divided into two series resistors R8 and a transistor Q7, the parallel circuit of the resistor R8 and the transistor Q7 is connected in series with a resistor R12, the resistor R12 is connected in series with two capacitors C5 and a player peripheral, the sound amplitude input pin SGOA is connected in series with a resistor R10, the resistor R10 is divided into two series resistors R1 and a transistor Q6, the parallel circuit of the resistor R1 and the transistor Q6 is connected in series with a resistor R9; the sound frequency input pin SGOF is connected in series with a resistor R13, the resistor R13 is divided into two series resistors R14 and a transistor Q1, the parallel circuit of the resistor R14 and the transistor Q1 is connected in series with a diode M7.

[0018] In the above technical solution: the CAN communication module unit is connected to external CAN communication equipment via the CAN-H bus and the CAN-L bus.

[0019] In the above technical solution: the broken code LCD screen display interface unit is connected to the working voltage allocated by the instrument through the VCC1 pin and the VLCD pin.

[0020] In the above technical solution: the indicator light module unit includes a high-level acquisition unit and a low-level acquisition unit, the high-level acquisition unit includes A7, A8, A9, and A10 high-level acquisition ports, the A8 acquisition port is connected in series with a resistor R15, the resistor R15 is connected in series with a resistor R16, the resistor R16 is connected in series with a capacitor C6, the resistor R16 and the capacitor C6 are connected in parallel with a wire, and are connected in series with a resistor R17 and a diode D4 in two ways respectively.

[0021] The utility model has the following advantages: 1. The central controller in the utility model is provided with a CAN communication module unit, which can directly receive and process CAN signals such as vehicle speed and rotation speed through CAN communication means, and send the processed signals to the LCD screen for relevant information, which is used to replace the functions of speed and distance measuring sensors, D / A conversion chips and stepper motor drive circuits.

[0022] 2. The utility model adopts a central controller MCU. Compared with the products in the prior art, the central controller MCU has the advantages of low power consumption and high performance.

[0023] 3. Compared with the prior art which uses module units such as D / A conversion chip, RS232 serial port conversion circuit, speed and distance measurement sensor, stepper motor drive circuit, etc., the utility model does not use the above module units, which simplifies the electronic circuit of the electric vehicle instrument and reduces the cost.

[0024] 4. The utility model reduces the power consumption of the instrument, improves the performance of the instrument, simplifies the electronic circuit of the electric vehicle instrument and reduces the cost by using modules such as the central controller MCU, the button unit, the 8MHz crystal oscillator circuit unit, the E2 module unit, the backlight module unit, the buzzer module unit, the CAN communication module unit, the code LCD display interface unit, and the indicator light module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the central controller MCU.

[0026] Figure 2 It is a structural diagram of the key unit.

[0027] Figure 3 This is a schematic diagram of the structure of an 8MHz crystal oscillator circuit unit.

[0028] Figure 4 This is a schematic diagram of the E2 module unit structure.

[0029] Figure 5 Schematic diagram of the backlight module unit structure.

[0030] Figure 6 This is a schematic diagram of the buzzer module unit structure.

[0031] Figure 7 It is a structural diagram of the CAN communication module unit.

[0032] Figure 8 It is a structural diagram of the broken code LCD screen display interface unit.

[0033] Fig. 9 It is a structural schematic diagram of the indicator light module unit.

[0034] Fig.10 It is a schematic diagram of the overall structure of the utility model.

[0035] In the figure: central controller MCU1, button unit 2, 8MHz crystal oscillator circuit unit 3, E2 module unit 4, backlight module unit 5, buzzer module unit 6, CAN communication module unit 7, code LCD display interface unit 8, indicator light module unit 9. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model are described clearly and completely below. The embodiments of the utility model and all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Reference Fig.10 As shown: a circuit of a DLE chip, which includes a central controller MCU1, a key unit 2, an 8MHz crystal oscillator circuit unit 3, an E2 module unit 4, a backlight module unit 5, a buzzer module unit 6, a CAN communication module unit 7, a broken code LCD display interface unit 8 and an indicator light module unit 9. The central controller MCU1 is connected to the key unit 2 through the key signal input pin K1, and the central controller MCU1 is connected to the buzzer module unit 6 through the sound amplitude output pin SGOA and the sound frequency output pin SGOF.

[0038] The central controller MCU1 is connected to the 8MHz crystal oscillator circuit unit 3 via the crystal oscillator signal input pin.

[0039] The central controller MCU1 is connected to the E2 module unit 4 via the data signal input pin E2-SDA and the clock signal input pin E2-SCL.

[0040] The central controller MCU1 is connected to the backlight module unit 5 via the PWM square wave signal input pin LED-PWM.

[0041] The central controller MCU1 is connected to the CAN communication module unit 7 via the CAN signal input pin Rx-CAN, and the output end of the indicator light module unit 9 is connected to the central controller MCU1.

[0042] The key unit 2 includes a working voltage input pin VCC, a current limiting resistor R1 with a resistance of 10KΩ is connected in series to the working voltage input pin VCC, and a capacitor C1 is connected in series to the resistor R1. The 8MHz crystal oscillator circuit unit 3 includes two parallel capacitors C2 and C3.

[0043] The E2 module unit 4 includes a working voltage input pin VCC, a capacitor C4 is connected in series to the working voltage input pin VCC, and the capacitor C4 is connected in series with two current limiting resistors R2 and R3 with the same resistance value of 4.7KΩ. The resistors R2 and R3 are connected in series with the E2 chip in two ways.

[0044] The backlight module unit 5 includes an operating voltage input pin VBAT, the operating voltage input pin VBAT is connected in series with a diode M7, the diode M7 is connected in series with a backlight signal processing chip E655, the backlight signal processing chip E655 is divided into two paths of series connection with resistors R4 and R5 with the same resistance value, the parallel resistors R4 and R5 are connected in series with a transistor Q5, the transistor Q5 is connected in series with a resistor R6, and the resistor R6 is connected in series with a resistor R7.

[0045] The buzzer module unit 6 includes a voltage input pin VBAT, a sound amplitude input pin SGOA and a sound frequency input pin SGOF. The voltage input pin VBAT is connected in series with a diode M7. The diode M7 is divided into two series resistors R8 and a transistor Q7. The parallel circuit of the resistor R8 and the transistor Q7 is connected in series with a resistor R12. The resistor R12 is connected in series with two capacitors C5 and a player peripheral. The sound amplitude input pin SGOA is connected in series with a resistor R10. The resistor R10 is divided into two series resistors R1 and a transistor Q6. The parallel circuit of the resistor R1 and the transistor Q6 is connected in series with a resistor R9. The sound frequency input pin SGOF is connected in series with a resistor R13. The resistor R13 is divided into two series resistors R14 and a transistor Q1. The parallel circuit of the resistor R14 and the transistor Q1 is connected in series with a diode M7.

[0046] The CAN communication module unit 7 is connected to external CAN communication devices via the CAN-H bus and the CAN-L bus.

[0047] The broken code LCD screen display interface unit 8 is connected to the working voltage allocated by the instrument through the VCC1 pin and the VLCD pin.

[0048] The indicator light module unit 9 includes a high-level acquisition unit and a low-level acquisition unit. The high-level acquisition unit includes A7, A8, A9, and A10 high-level acquisition ports. The A8 acquisition port is connected in series with a resistor R15. The resistor R15 is connected in series with a resistor R16. The resistor R16 is connected in series with a capacitor C6. The resistor R16 and the capacitor C6 are connected in parallel with a wire and are connected in series with a resistor R17 and a diode D4 in two ways.

[0049] Embodiment: After the central controller MCU1 receives the key trigger signal transmitted by the key unit 2 through the key signal input pin K1, the central controller MCU1 executes the relevant instructions. The central controller MCU1 receives the timing beat signal generated by the 8MHz crystal oscillator circuit unit 3 through the crystal oscillator signal input pin to ensure that the central controller MCU1 executes the program instructions normally. The central controller MCU1 receives the data information and clock information transmitted by the E2 module unit through the data signal input pin E2-SDA and the clock signal input pin E2-SCL.

[0050] The central controller MCU1 transmits the sound configuration information to the buzzer module unit through the sound amplitude output pin SGOA and the sound frequency output pin SGOF to control the buzzing.

[0051] The central controller MCU1 receives the PWM square wave signal generated by the backlight module unit through the PWM square wave signal input pin LED-PWM, which is used to control the display brightness of the LCD liquid crystal screen.

[0052] The central controller MCU1 receives the CAN signal transmitted by the CAN communication module unit through the CAN signal input pin Rx-CAN.

[0053] The central controller MCU1 transmits the CAN signal sent by the instrument to the CAN communication module unit through the CAN signal output pin Tx-CAN to achieve communication with external devices. Figure 1 shown.

[0054] The key unit 2 includes a working voltage input pin VCC, a current limiting resistor R1 with a resistance of 10KΩ is connected in series to the working voltage input pin VCC, and a capacitor C1 is connected in series to the resistor R1. When the key unit 2 obtains the key trigger signal, the resistor R1 limits the current, and the capacitor C1 filters the signal, and then transmits the signal to the central controller MCU1 through the pin K1. Figure 2 shown.

[0055] The 8MHz crystal oscillator circuit unit 3 includes two parallel capacitors C2 and C3. When the 8MHz crystal oscillator circuit unit 3 generates a timing beat signal, the parallel capacitors C2 and C3 filter the signal and then transmit it to the central controller MCU1 through the crystal oscillator signal output pins x1 and x2 to ensure that it can execute related instructions normally. Figure 3 Shown

[0056] The E2 module unit 4 includes a working voltage input pin VCC, a capacitor C4 is connected in series to the working voltage input pin VCC, and the capacitor C4 is divided into two paths, each of which is connected in series with a current limiting resistor R2 and R3 with the same resistance value of 4.7KΩ. The resistors R2 and R3 are connected in series with the E2 chip in two paths. The timing signal output by the E2 chip through the clock signal output pin E2-SCL is passed through the resistor R2 for current limiting and the capacitor C4 for filtering before being transmitted to the central controller MCU1, thereby realizing synchronous communication with the central controller MCU1; the data signal output by the E2 chip through the data signal output pin E2-SDA is passed through the resistor R3 for current limiting and the capacitor C4 for filtering before being transmitted to the central controller MCU1, thereby realizing data communication with the central controller MCU1. Figure 4 shown.

[0057] The backlight module unit 5 includes a working voltage input pin VBAT, the working voltage input pin VBAT is connected in series with a diode M7, the diode M7 is connected in series with a backlight signal processing chip E655, the backlight signal processing chip E655 is divided into two paths and connected in series with resistors R4 and R5 of the same resistance value, the parallel resistors R4 and R5 are connected in series with a transistor Q5, the transistor Q5 is connected in series with a resistor R6, and the resistor R6 is connected in series with a resistor R7. The backlight module unit 5 receives the working voltage assigned by the instrument through the pin VBAT, and after being unidirectionally conducted by the diode M7, it is passed to the chip E655 to make it work. The chip generates a PWM square wave signal to drive the backlight source through internal instructions, which is limited by the parallel resistors R4 and R5, then turned on by the transistor Q5, and finally limited by the resistors R6 and R7, and then the PWM square wave signal is passed to the central controller MCU1 through the PWM square wave output pin O_LEDPWM. Figure 5 Shown

[0058] The buzzer module unit 6 includes a voltage input pin VBAT, a sound amplitude input pin SGOA, and a sound frequency input pin SGOF. The voltage input pin VBAT is connected in series with a diode M7, and the diode M7 is divided into two series resistors R8 and transistor Q7. The parallel circuit of the resistor R8 and the transistor Q7 is connected in series with a resistor R12, and the resistor R12 is divided into two series capacitors C5 and player peripherals; the sound amplitude input pin SGOA is connected in series with a resistor R10, and the resistor R10 is divided into two series resistors R1 and transistor Q6. The parallel circuit of the resistor R1 and the transistor Q6 is connected in series with a resistor R9.

[0059] The sound frequency input pin SGOF is connected in series with resistor R13, and the resistor R13 is divided into two paths in series with resistor R14 and transistor Q1. The parallel circuit of the resistor R14 and transistor Q1 is connected in series with diode M7. The buzzer module unit 6 receives the working voltage allocated by the instrument through the VBAT pin to make it work normally, and then receives the sound amplitude signal transmitted by the central controller MCU1 through the pin SGOA, and receives the sound frequency signal transmitted by the central controller MCU1 through the pin SGOF. After the received amplitude and frequency signals are processed by the internal circuit, the sound signal is finally output through peripherals such as speakers. Figure 6 shown.

[0060] The CAN communication module unit 7 is connected to the external CAN communication device through the CAN-H bus and the CAN-L bus; and is connected to the central controller MCU1 through the RX-CAN pin and the TX-CAN pin. The CAN communication module unit 7 communicates signals with the external CAN communication device through the CAN-H bus and the CAN-L bus, and transmits the external CAN signal to the central controller MCU1 through the RX-CAN pin, receives the CAN signal transmitted by the central controller MCU1 through the TX-CAN pin, and transmits the signal to the external device through the CAN-H bus and the CAN-L bus. Figure 7 Shown

[0061] The VCC1 pin and VLCD pin of the LCD display interface unit 8 receive the working voltage allocated by the instrument, which is used to drive the LCD to work normally. The data signal transmitted by the central controller MCU1 is received through the data signal input pin SDA, and the clock signal transmitted by the central controller MCU1 is received through the clock signal input pin SCL. Then, the received data signal and clock signal are used to drive the LCD to display relevant content. Figure 8 shown.

[0062] The indicator light module unit 9 includes a high-level acquisition unit and a low-level acquisition unit. The high-level acquisition unit includes A7, A8, A9, and A10 high-level acquisition ports. The A8 acquisition port is connected in series with a resistor R15. The resistor R15 is connected in series with a resistor R16. The resistor R16 is connected in series with a capacitor C6. The resistor R16 and the capacitor C6 are connected in parallel with a wire and are connected in series with a resistor R17 and a diode D4 in two ways.

[0063] A8 port collects high level, passes through resistors R15 and R16 to limit current, capacitor C6 filters, one signal passes through resistor R17 to limit current and then transmits the high level signal to the central controller MCU1, and finally the central controller MCU1 controls the left turn indicator to light up; another signal passes through diode D4 to be unidirectionally conducted and then transmitted to the central controller MCU1 to wake up the instrument, and the circuits of A7, A9, and A10 high level acquisition ports are the same as above. The low level acquisition unit includes A4, A5, and A6 low level acquisition ports, the A4 acquisition port is connected in series with diode D8, the diode D8 is divided into two paths connected in series with resistors R27 and R28, the resistor R27 is connected in series with the voltage input port VCC_1, the resistor R28 is connected in series with capacitor C10, the capacitor C10 is connected in series with resistor R29, the capacitor C10 and resistor R29 are connected in parallel with a wire and then connected in series with resistor R30.

[0064] A4 port collects low level, and after diode D8 conducts unidirectionally, it pulls down the circuit voltage, and after resistor R28 limits the current, capacitor C10 filters, and resistors R29 and R30 limit the current, the low level signal is transmitted to the central controller MCU1, and finally the central controller MCU1 controls the brake fault indicator to light up. The low level collection ports A5 and A6 are the same as above. Fig. 9 The parts not described in detail above are all prior art.

Claims

1. A circuit of a DLE chip, comprising a central controller MCU (1), a key unit (2), an 8 MHz crystal oscillator circuit unit (3), an E2 module unit (4), a backlight module unit (5), a buzzer module unit (6), a CAN communication module unit (7), a code-breaking LCD display interface unit (8) and an indicator light module unit (9), wherein the central controller MCU (1) is connected to the key unit (2) via a key signal input pin K1, and the central controller MCU (1) is connected to the buzzer module unit (6) via a sound amplitude output pin SGOA and a sound frequency output pin SGOF. Features: The central controller MCU (1) is connected to the 8 MHz crystal oscillator circuit unit (3) via a crystal oscillator signal input pin. The central controller MCU (1) is connected to the E2 module unit (4) via a data signal input pin E2-SDA and a clock signal input pin E2-SCL. The central controller MCU (1) is connected to the backlight module unit (5) via the PWM square wave signal input pin LED-PWM. The central controller MCU (1) is connected to the CAN communication module unit (7) via the CAN signal input pin Rx-CAN, and the output end of the indicator light module unit (9) is connected to the central controller MCU (1).

2. The circuit of a DLE chip according to claim 1, characterized in that: The key unit (2) comprises a working voltage input pin VCC, a current limiting resistor R1 with a resistance value of 10KΩ is connected in series to the working voltage input pin VCC, and a capacitor C1 is connected in series to the resistor R1.

3. The circuit of a DLE chip according to claim 1, characterized in that: The 8 MHz crystal oscillator circuit unit (3) comprises two parallel capacitors C2 and C3.

4. The circuit of a DLE chip according to claim 1, characterized in that: The E2 module unit (4) comprises a working voltage input pin VCC, a capacitor C4 is connected in series to the working voltage input pin VCC, the capacitor C4 is connected in series with two current limiting resistors R2 and R3 with the same resistance value of 4.7KΩ, and the resistors R2 and R3 are connected in series with the E2 chip in two ways.

5. The circuit of a DLE chip according to claim 1, characterized in that: The backlight module unit (5) comprises an operating voltage input pin VBAT, the operating voltage input pin VBAT is connected in series with a diode M7, the diode M7 is connected in series with a backlight signal processing chip E655, the backlight signal processing chip E655 is divided into two paths and connected in series with resistors R4 and R5 of the same resistance value, the parallel resistors R4 and R5 are connected in series with a transistor Q5, the transistor Q5 is connected in series with a resistor R6, and the resistor R6 is connected in series with a resistor R7.

6. The circuit of a DLE chip according to claim 1, characterized in that: The buzzer module unit (6) comprises a voltage input pin VBAT, a sound amplitude input pin SGOA and a sound frequency input pin SGOF, the voltage input pin VBAT is connected in series with a diode M7, the diode M7 is divided into two paths of series connection with a resistor R8 and a transistor Q7, the parallel circuit of the resistor R8 and the transistor Q7 is connected in series with a resistor R12, the resistor R12 is connected in series with two paths of a capacitor C5 and a player peripheral, the sound amplitude input pin SGOA is connected in series with a resistor R10, the resistor R10 is divided into two paths of series connection with a resistor R1 and a transistor Q6, the parallel circuit of the resistor R1 and the transistor Q6 is connected in series with a resistor R9; the sound frequency input pin SGOF is connected in series with a resistor R13, the resistor R13 is divided into two paths of series connection with a resistor R14 and a transistor Q1, the parallel circuit of the resistor R14 and the transistor Q1 is connected in series with a diode M7.

7. The circuit of a DLE chip according to claim 1, characterized in that: The CAN communication module unit (7) is connected to external CAN communication equipment via a CAN-H bus and a CAN-L bus.

8. The circuit of a DLE chip according to claim 1, characterized in that: The broken code LCD screen display interface unit (8) is connected to the working voltage allocated by the instrument through the VCC1 pin and the VLCD pin.

9. The circuit of a DLE chip according to claim 1, characterized in that: The indicator light module unit (9) comprises a high level acquisition unit and a low level acquisition unit, wherein the high level acquisition unit comprises high level acquisition ports A7, A8, A9 and A10, wherein the A8 acquisition port is connected in series with a resistor R15, wherein the resistor R15 is connected in series with a resistor R16, wherein the The resistor R16 is connected in series with the capacitor C6, and the resistor R16 and the capacitor C6 are connected in parallel with a wire. And it is divided into two paths and connected in series with resistor R17 and diode D4 respectively.

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