Isolation circuit, vehicle machine and vehicle

Abstract

The application relates to an isolation circuit, a vehicle machine and a vehicle, and relates to the technical field of circuits. The isolation circuit comprises a first input end, a second input end, a first output end, a second output end and a level conversion circuit; the first input end is connected with a serial clock line port of a first circuit; the second input end is connected with a serial data line port of the first circuit; the first output end is connected with a serial clock line port of a second circuit; the second output end is connected with a serial data line port of the second circuit; the level conversion circuit is used for lowering the level of a signal input by the first input end and then outputting the signal through the first output end; and the level conversion circuit is also used for lowering the level of a signal input by the second input end and then outputting the signal through the second output end. By using the scheme, the problem of the 5G module pouring electricity into the IMU chip is overcome, and normal communication between the 5G module and the IMU chip is ensured.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and more particularly to an isolation circuit, vehicle infotainment system, and vehicle. Background Technology

[0002] Vehicles can achieve fusion positioning through 5G modules and inertial measurement units (IMUs) to improve positioning accuracy.

[0003] In current in-vehicle head unit (HU) hardware solutions, the 5G module and the IMU chip can be connected via an integrated circuit (I-Integrated Circuit). 2 C) Communication is performed via the bus. Among them, I 2 The C bus includes a serial clock line (SCL) and a serial data line (SDA).

[0004] According to current IMU chip power-on timing rules, the SCL pin should be at a low level before the IMU chip powers on normally to ensure normal power-on and operation. However, in current hardware solutions, if the 5G module powers on first, the 5G module will... 2 The C bus generates a reverse voltage on the SCL and SDA pins of the IMU chip, causing the SCL pin level to rise. This prevents the IMU chip from powering on normally, thus preventing the 5G module from communicating with the IMU chip. Summary of the Invention

[0005] In view of the above problems, this application provides an isolation circuit, device, storage medium and equipment to overcome the power-down problem of the 5G module to the IMU chip and ensure normal communication between the 5G module and the IMU chip.

[0006] In a first aspect, this application provides an isolation circuit, including a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a level conversion circuit; the first input terminal is connected to the serial clock line port of a first circuit; the second input terminal is connected to the serial data line port of the first circuit; the first output terminal is connected to the serial clock line port of a second circuit; the second output terminal is connected to the serial data line port of the second circuit; the level conversion circuit is used to reduce the level of the signal input at the first input terminal and output it through the first output terminal; and to reduce the level of the signal input at the second input terminal and output it through the second output terminal.

[0007] The solution provided in this application, when the first circuit and the second circuit are connected via I... 2 When communicating via the C-bus, an isolation circuit is set between the first circuit and the second circuit. The first and second input terminals of the isolation circuit are connected to the I-channel of the first circuit. 2 The C-bus port, the first and second outputs of the isolation circuit are connected to the I-channel of the second circuit. 2 The C-bus port isolation circuit can reduce the level of the signal input at the first input terminal and output it through the first output terminal, and reduce the level of the signal input at the second input terminal and output it through the second output terminal. This ensures that even if the first circuit powers on before the second circuit, the I / O of the second circuit is guaranteed before the second circuit powers on normally. 2 The C-bus port is at a low level, ensuring that the second circuit can be powered on normally, overcoming the power-feeding problem of the first circuit to the second circuit, and ensuring normal communication between the first and second circuits. In the vehicle-mounted fusion positioning scenario, the first circuit may include a 5G module, and the second circuit may include an IMU chip. Therefore, this solution overcomes the power-feeding problem of the 5G module to the IMU chip, ensuring normal communication between the 5G module and the IMU chip.

[0008] In one possible implementation, the power supply of the first circuit is powered on before the power supply of the second circuit.

[0009] In one possible implementation, the level conversion circuit is a level conversion chip; the first input pin of the level conversion chip is the first input terminal; the second input pin of the level conversion chip is the second input terminal; the first output pin of the level conversion chip is the first output terminal; and the second output pin of the level conversion chip is the first output terminal.

[0010] In one possible implementation, the level conversion chip further includes: a first power supply pin and a second power supply pin; the first power supply pin is connected to the power supply of the first circuit; and the second power supply pin is connected to the power supply of the second circuit.

[0011] In one possible implementation, the level conversion chip further includes an enable pin, the enable signal of which is synchronized with the power control signal of the second circuit; wherein the power control signal of the second circuit is used to control the second circuit to start or stop power supply.

[0012] Secondly, this application also provides a vehicle-mounted infotainment system, which includes the isolation circuit provided in the first aspect and any implementation thereof, and further includes a 5G module and an inertial measurement unit (IMU) chip. The first circuit includes the 5G module, and the second circuit includes the IMU chip.

[0013] In one possible implementation, the enable signal is the power control signal of the second circuit; the vehicle system also includes a power control circuit, which includes a first resistor, a second resistor, a first switch, and a second switch; the first end of the first resistor is connected to the first end of the first switch and the power supply of the second circuit; the second end of the first resistor is connected to the control terminal of the first switch and the first end of the second resistor; the second end of the first switch is connected to the power input terminal of the second circuit; the second end of the second resistor is connected to the first end of the second switch, and the second end of the second switch is grounded; the power control signal is connected to the control terminal of the second switch and the enable pin.

[0014] In one possible implementation, the power control circuit further includes a first capacitor; a first terminal of the first capacitor is connected to the power supply of the second circuit, and a second terminal of the first capacitor is grounded.

[0015] In one possible implementation, the power control circuit further includes a second capacitor; the first end of the second capacitor is connected to the first end of the first switch, and the second end of the second capacitor is connected to the first end of the second resistor.

[0016] Thirdly, this application also provides a vehicle, which includes the vehicle-mounted system provided in the second aspect and any implementation thereof. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A connection diagram of an existing 5G module and IMU chip provided for this application;

[0019] Figure 2 A schematic diagram of an isolation circuit provided in an embodiment of this application;

[0020] Figure 3 A schematic diagram of another isolation circuit provided in an embodiment of this application;

[0021] Figure 4 A schematic diagram of a vehicle infotainment system provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of a vehicle provided in an embodiment of this application. Detailed Implementation

[0023] To enable those skilled in the art to better understand the solution of this application, the application scenario of the technical solution of this application will be described first below.

[0024] See Figure 1 The figure is a schematic diagram of the connection between the existing 5G module and the IMU chip provided in this application.

[0025] An IMU (Integrated Mutual Measure) can measure an object's three-axis attitude angles (or angular rates) and acceleration. IMUs used in vehicles are typically six-axis IMUs, containing three single-axis accelerometers and three single-axis gyroscopes. The accelerometers detect acceleration signals along the three independent axes of the vehicle's coordinate system, while the gyroscopes detect the angular velocity signals of the vehicle relative to the navigation coordinate system. By measuring the vehicle's angular velocity and acceleration in three-dimensional space, the vehicle's attitude can be calculated. The IMU can be integrated into an IMU chip 10.

[0026] The 5G module 20 is used to provide a high-bandwidth, low-latency, and highly reliable wireless network.

[0027] The IMU chip 10 and 5G module 20 can be used to achieve fusion positioning and improve positioning accuracy.

[0028] The 5G module 20 and the IMU chip 10 can communicate via I... 2 Communication is performed via the C bus. In the following description of this application, the pins connected to the serial clock line (SCL) are identified as SCL, and the pins connected to the serial data line (SDA) are identified as SDA.

[0029] The SCL pin of IMU chip 10 is connected to the SCL pin of 5G module 20, and the SDA pin of IMU chip 10 is connected to the SDA pin of 5G module 20. The VDD and VDDIO pins are connected to the power supply IMU_1V8 of IMU chip 10.

[0030] According to current IMU chip power-on timing rules, the SCL pin should be at a low level before the IMU chip powers on normally to ensure normal power-on and operation. However, in current hardware solutions, if the 5G module powers on first, the 5G module will... 2 The C bus generates a reverse voltage on the SCL and SDA pins of the IMU chip, causing the SCL pin level to rise. This prevents the IMU chip from powering on normally, thus preventing the 5G module from communicating with the IMU chip.

[0031] To address the above technical problems, this application provides an isolation circuit, a vehicle infotainment system, and a vehicle. When the first circuit and the second circuit are connected via I... 2When communicating via the C-bus, an isolation circuit is set between the first and second circuits. The first and second input terminals of the isolation circuit are connected to the I-channels of the first circuit. 2 The C-bus port, the first and second outputs of the isolation circuit are connected to the I-channel of the second circuit. 2 The C-bus port isolation circuit can reduce the level of the signal input at the first input terminal and output it through the first output terminal, and reduce the level of the signal input at the second input terminal and output it through the second output terminal. This ensures that even if the first circuit powers on before the second circuit, the I / O of the second circuit is guaranteed before the second circuit powers on normally. 2 The C bus port is at a low level, ensuring that the second circuit can be powered on normally, overcoming the problem of the first circuit powering on the second circuit, and ensuring normal communication between the first and second circuits.

[0032] The implementation of the technical solution of this application is described in detail below with reference to the accompanying drawings. The terms "first," "second," etc., used in this application description are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0033] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral part; it may be a direct connection or an indirect connection through an intermediate medium.

[0034] See Figure 2 The figure is a schematic diagram of an isolation circuit provided in an embodiment of this application.

[0035] The isolation circuit 300 includes: a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1, a second output terminal OUT2, and a level conversion circuit 301.

[0036] The first input terminal IN1 is connected to the serial clock line port SCL of the first circuit 200.

[0037] The second input terminal IN2 is connected to the serial data line port SDA of the first circuit 200.

[0038] The first output terminal OUT1 is connected to the serial clock line port SCL of the second circuit 100.

[0039] The second output terminal OUT2 is connected to the serial data line port SDA of the second circuit 100.

[0040] The level shift circuit 301 can realize the level shifting of the signal. Specifically, it can reduce the level of the signal input at the first input terminal IN1 and output it through the first output terminal OUT1; and it can reduce the level of the signal input at the second input terminal IN2 and output it through the second output terminal OUT2.

[0041] By controlling the I output of the first circuit 200 2 The drop-level of the C bus signal overcomes the communication barrier between the first circuit 200 and the second circuit 100 via I / O. 2 When the C bus is directly connected, the I of the first circuit 200 2 The C bus voltage causes a power sinking problem in the second circuit 100.

[0042] In this embodiment of the application, the power-on sequence of the first circuit 200 and the second circuit 100 is not specifically limited. For example, the first circuit 200 can be powered on first, and then the second circuit 100 can be powered on later; or the second circuit 100 can be powered on first, and then the first circuit 200 can be powered on later.

[0043] In summary, using the solution provided in the embodiments of this application, when the first circuit and the second circuit pass through I... 2 When communicating via the C-bus, an isolation circuit is set between the first circuit and the second circuit. The first and second input terminals of the isolation circuit are connected to the I-channel of the first circuit. 2 The C-bus port, the first and second outputs of the isolation circuit are connected to the I-channel of the second circuit. 2 The C-bus port isolation circuit can reduce the level of the signal input at the first input terminal and output it through the first output terminal, and reduce the level of the signal input at the second input terminal and output it through the second output terminal. This ensures that even if the first circuit powers on before the second circuit, the I / O of the second circuit is guaranteed before the second circuit powers on normally. 2 The C-bus port is at a low level, ensuring that the second circuit can be powered on normally, overcoming the power-feeding problem of the first circuit to the second circuit, and ensuring normal communication between the first and second circuits. In the vehicle-mounted fusion positioning scenario, the first circuit may include a 5G module, and the second circuit may include an IMU chip. Therefore, this solution overcomes the power-feeding problem of the 5G module to the IMU chip, ensuring normal communication between the 5G module and the IMU chip.

[0044] The following description, in conjunction with specific implementation methods, illustrates this approach. In the following description of embodiments of this application, an example is given where the first circuit includes a 5G module and the second circuit includes an IMU chip.

[0045] See Figure 3 This figure is a schematic diagram of another isolation circuit provided in an embodiment of this application.

[0046] In this embodiment of the application, the isolation circuit 300 includes a level conversion circuit specifically a level conversion chip 3011.

[0047] The first input pin A1 of the level conversion chip 3011 is the first input terminal, connected to the serial clock line port of the first circuit (not shown in the figure), corresponding to... Figure 3 5G_I2C_SCL in.

[0048] The second input pin A1 of the level conversion chip 3011 is the second input terminal, connected to the serial data line port of the first circuit (not shown in the figure), corresponding to... Figure 3 5G_I2C_SDA in it.

[0049] The first output pin B1 of the level conversion chip 3011 is the first output terminal, which is connected to the SCL pin of the IMU chip.

[0050] The second output pin B2 of the level conversion chip 3011 is the first output terminal, which is connected to the SDA pin of the IMU chip.

[0051] The level conversion chip 3011 can perform level reduction conversion. Specifically, it can reduce the level of the signal input A1 and output it through B1; and it can reduce the level of the signal input A2 and output it through B2.

[0052] The level conversion chip 3011 can ensure normal communication between the 5G module and the IMU chip 100 via the I2C bus, and also prevent the 5G module from powering on the IMU chip 100 via the I2C bus before the IMU chip 100 is powered on, which would prevent the IMU chip 100 from starting up normally.

[0053] In one possible implementation, the level shifting chip 3011 further includes a first power supply pin VCCA and a second power supply pin VCCB. The first power supply pin VCCA is connected to the power supply of the first circuit. Figure 3 In this context, it is represented by 5G_EXT_1V8; the second power supply pin VCCB is connected to the power supply of the second circuit. Figure 3 It is represented as IMU_1V8 in Chinese. The voltage connected to VCCA and VCCB can be 1.8V.

[0054] In the application embodiment, the SCL pin level signal of the IMU chip 100 is low before the IMU chip 100 is powered on.

[0055] In one possible implementation, the level conversion chip 3011 also includes an enable pin REGOUT, whose enable signal is synchronized with the power control signal 5G_IMU_PWR_EN of the second circuit. The power control signal of the second circuit is used to control the second circuit to start or stop power supply, that is, to control the power supply IMU_1V8 connected to VDD and VDD IO of the IMU chip 100 to start or stop power supply.

[0056] In this embodiment, the power control signal of the second circuit and the enable signal of the REGOUT enable pin can be multiplexed using the same signal. Figure 3 The Chinese version uses 5G_IMU_PWR_EN to represent this.

[0057] In one possible implementation, the power supply IMU_1V8 of the second circuit is controlled by the power control circuit 401 to start or stop power supply.

[0058] The power control circuit 401 provided in this application embodiment includes a first resistor R1, a second resistor R2, a first switch Q1, and a second switch Q2.

[0059] The first terminal of the first resistor R1 is connected to the first terminal of the first switch Q1 and the system power supply MCU_1V8 of the second circuit. The system power supply MCU_1V8 is used to generate the power supply IMU_1V8 for the IMU chip 100. Whether the system power supply MCU_1V8 generates the power supply IMU_1V8 for the IMU chip 100 can be controlled by the power control signal 5G_IMU_PWR_EN.

[0060] The second end of the first resistor R1 is connected to the control terminal of the first switch Q1, the system power supply MCU_1V8, and the first end of the second resistor R2.

[0061] The second terminal of the first switch Q1 is connected to IMU_1V8.

[0062] Q1 can be an Insulated Gate Bipolar Transistor (IGBT), a Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET), or a Silicon Carbide Metal-Oxide Semiconductor (SiC MOSFET), etc. In this embodiment, Q1 is described as a PMOS transistor, where the first terminal of Q1 is the source, the second terminal is the drain, and the control terminal is the gate.

[0063] The second end of the second resistor R2 is connected to the first end of the second switch Q2, and the second end of the second switch Q2 is grounded.

[0064] The power control signal 5G_IMU_PWR_EN is connected to the control terminal and enable pin REGOUT of the second switch Q2.

[0065] If Q2 is a transistor, then the first terminal of Q2 is the collector, the second terminal of Q2 is the emitter, and the control terminal of Q2 is the base.

[0066] In one possible implementation, the isolation circuit further includes a first capacitor C1, with its first terminal connected to the system power supply MCU_1V8 and its second terminal grounded. The first capacitor C1 is a filter capacitor.

[0067] In one possible implementation, the isolation circuit further includes a second capacitor C2, with its first terminal connected to the source of the first switch Q1 and its second terminal connected to the first terminal of the second resistor. The second capacitor C2 is a bootstrap capacitor.

[0068] The working principle of the power control circuit 401 is explained below.

[0069] After the vehicle's system power MCU_1V8 is powered on, the system power MCU_1V8 starts to provide 1.8V voltage. Initially, Q1 is turned off, and IMU_1V8 has not yet supplied power to the IMU.

[0070] When the Microcontroller Unit (MCU) sends the power control signal 5G_IMU_PWR_EN to power on the IMU chip 100, this power control signal controls the transistor Q2 to turn on, pulling the control terminal level of Q1 low, thereby turning on Q1. The system power supply MCU_1V8 generates the IMU power supply IMU_1V8, and the voltage of this power supply is the 1.8V voltage required for the normal operation of the IMU chip.

[0071] Simultaneously, the 5G_IMU_PWR_EN signal emitted by the MCU can be used as the enable signal for the level conversion chip 3011, and is input to the enable pin REGOUT of the level conversion chip 3011. The A terminal of the level conversion chip 3011 is connected to the I terminal of the 5G module. 2 The C bus is powered via 5G_EXT_1V8; the B terminal of the level conversion chip 3011 is connected to the I / O pin of the IMU chip. 2 The C bus is powered via IMU_1V8.

[0072] Even if the 5G_EXT_1V8 powers on before the IMU_1V8, due to the level conversion function of the 3011 level conversion chip, the I connected to pin A will still be connected to the IMU. 2After the C-bus signals 5G_IMU_I2C_SCL and 5G_IMU_I2C_SDA are reduced in level by the level conversion chip 3011, the levels of SENSOR_I2C_SCL and SENSOR_I2C_SDA output through the B terminal have already decreased, so there will be no sinking of the SCL and SDA pins of the IMU chip 100. Therefore, in this embodiment, the power supply of the first circuit can be allowed to be powered on before the power supply of the second circuit, simply by adding the level conversion chip 3011 to the hardware circuit to convert the I-C signals of the 5G module and the I-C chip to SCL and SDA. 2 The C-bus is isolated, but this does not affect the normal data communication between the 5G module and the IMU chip, and it does not add any workload to the software.

[0073] Based on the isolation circuits provided in the above embodiments, this application also provides a vehicle infotainment system, which will be described in detail below with reference to the accompanying drawings.

[0074] See Figure 4 This figure is a schematic diagram of a vehicle system provided in an embodiment of this application.

[0075] The vehicle infotainment system 400 includes: an isolation circuit 300, a first circuit 200, and a second circuit 100.

[0076] The first circuit 200 includes a 5G module, and the second circuit 100 includes an IMU chip. Specifically, the vehicle-mounted system provided in this embodiment includes both a 5G module and an IMU chip, enabling fused positioning. In one possible implementation, the vehicle-mounted system 400 further includes a power control circuit 401. For details on the specific implementation and working principle of the isolation circuit 300 and the power control circuit 401, please refer to the descriptions in the above embodiments; these details will not be repeated here.

[0077] In one possible implementation, the vehicle infotainment system also includes an MCU, which generates a power-on signal for the IMU chip 100 and an enable signal for the level conversion chip 3011.

[0078] In summary, the vehicle infotainment system provided in this application embodiment adds an isolation circuit. When the first circuit and the second circuit pass through I... 2 When communicating via the C-bus, an isolation circuit is set between the first circuit and the second circuit. The first and second input terminals of the isolation circuit are connected to the I-channel of the first circuit. 2 The C-bus port, the first and second outputs of the isolation circuit are connected to the I-channel of the second circuit. 2The C-bus port isolation circuit can reduce the level of the signal input at the first input terminal and output it through the first output terminal, and reduce the level of the signal input at the second input terminal and output it through the second output terminal. This ensures that even if the first circuit powers on before the second circuit, the I / O of the second circuit is guaranteed before the second circuit powers on normally. 2 The C-bus port is at a low level, ensuring that the second circuit can be powered on normally, overcoming the power-feeding problem of the first circuit to the second circuit, and ensuring normal communication between the first and second circuits. In the vehicle-mounted fusion positioning scenario, the first circuit may include a 5G module, and the second circuit may include an IMU chip. Therefore, this solution overcomes the power-feeding problem of the 5G module to the IMU chip, ensuring normal communication between the 5G module and the IMU chip.

[0079] Furthermore, embodiments of this application also provide a vehicle, such as... Figure 5 As shown, the vehicle 500 includes the in-vehicle infotainment system 400 described in the above embodiments, or other in-vehicle mobile terminals. The vehicle can be a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an extended-range electric vehicle (EREV), a fuel cell vehicle (FCV), etc.

[0080] The vehicle's infotainment system has been equipped with an isolation circuit, which overcomes the power-feeding problem of the 5G module to the IMU chip and ensures that the 5G module and the IMU chip can communicate normally.

[0081] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0082] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0083] It should also be noted that, in this document, relational terms such as "first" and "second" are used only 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. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover 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 one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An isolation circuit, characterized in that, include: The circuit includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a level conversion circuit. The first input terminal is connected to the serial clock line port of the first circuit; The second input terminal is connected to the serial data line port of the first circuit; The first output terminal is connected to the serial clock line port of the second circuit; The second output terminal is connected to the serial data line port of the second circuit; The level conversion circuit is used to reduce the level of the signal input at the first input terminal and output it through the first output terminal. And, it is used to reduce the level of the signal input at the second input terminal and output it through the second output terminal.

2. The isolation circuit according to claim 1, characterized in that, The power supply for the first circuit is powered on before the power supply for the second circuit.

3. The isolation circuit according to any one of claims 1-2, characterized in that, The level conversion circuit is a level conversion chip; The first input pin of the level conversion chip is the first input terminal; The second input pin of the level conversion chip is the second input terminal; The first output pin of the level conversion chip is the first output terminal; The second output pin of the level conversion chip is the first output terminal.

4. The isolation circuit according to claim 3, characterized in that, The level conversion chip also includes: a first power supply pin and a second power supply pin; The first power supply pin is connected to the power supply of the first circuit; The second power supply pin is connected to the power supply of the second circuit.

5. The isolation circuit according to claim 3, characterized in that, The level conversion chip also includes an enable pin, the enable signal of which is synchronized with the power control signal of the second circuit; wherein the power control signal of the second circuit is used to control the second circuit to start or stop power supply.

6. A vehicle infotainment system, characterized in that, include: The isolation circuit according to any one of claims 1-5 further includes a 5G module and an inertial measurement unit (IMU) chip; The first circuit includes the 5G module, and the second circuit includes the IMU chip.

7. The vehicle infotainment system according to claim 6, characterized in that, The enable signal is the power control signal of the second circuit; the vehicle system also includes a power control circuit. The power control circuit includes a first resistor, a second resistor, a first switch, and a second switch; The first end of the first resistor is connected to the first end of the first switch and the power supply of the second circuit; The second end of the first resistor is connected to the control terminal of the first switch and the first end of the second resistor; The second terminal of the first switch is connected to the power input terminal of the second circuit; The second end of the second resistor is connected to the first end of the second switch, and the second end of the second switch is grounded. The power control signal is connected to the control terminal of the second switch and the enable pin.

8. The vehicle infotainment system according to claim 7, characterized in that, The power control circuit also includes a first capacitor; The first terminal of the first capacitor is connected to the power supply of the second circuit, and the second terminal of the first capacitor is grounded.

9. The vehicle infotainment system according to claim 7, characterized in that, The power control circuit also includes a second capacitor; The first end of the second capacitor is connected to the first end of the first switch, and the second end of the second capacitor is connected to the first end of the second resistor.

10. A vehicle, characterized in that, The vehicle includes the vehicle-mounted system as described in any one of claims 6-9.

Images