Module for realizing SBC function based on discrete device

Abstract

The utility model relates to the technical field of automotive electronics, and discloses a module for realizing an SBC function based on a discrete device, which comprises a VBAT power supply end, an MCU microprocessor, a CAN chip, an LDO1 chip and an LDO2 chip, the MCU microprocessor is in communication connection with the CAN chip through a CAN bus, the CAN chip is provided with a VCC pin, a CANEN pin, a CANSTB pin and an INH pin, the VBAT power supply end is connected with the LDO1 chip, and the LDO2 chip is connected with the VBAT power supply end. The MCU microprocessor is respectively connected with a CANEN pin and a CANSTB pin of the CAN chip through a CANEN signal line and a CANSTB signal line, the LDO1 chip is provided with a voltage stabilization output end VCC1 and an input end INH1, the voltage stabilization output end VCC1 is connected with a VCC pin of the CAN chip, the LDO2 chip is provided with a voltage stabilization output end VCC2 and an input end INH2, the voltage stabilization output end VCC2 is connected with the MCU microprocessor, and the input end INH1 is connected with the input end INH2. And the input end INH2 and the input end INH2 are both connected with an INH pin of the CAN chip. According to the utility model, discrete devices are adopted to replace the SBC so as to realize the SBC function, and cost optimization is carried out while the utilization rate of the devices is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electronics, in particular to a module for realizing an SBC function based on discrete devices. Background Art

[0002] As automotive electronic modules become increasingly miniaturized, the requirements for low power consumption and reliability are becoming increasingly higher. Therefore, module-based chips (SBCs) that integrate functions such as power supply, communication, monitoring and diagnosis, and safety monitoring are increasingly being used in the field of automotive electronics. However, in actual electronic hardware design, the utilization rate of SBC functions is low, the redundancy is high, and as more and more functions are integrated inside the SBC, the cost of SBC chips is gradually increasing, which is not conducive to production. Utility Model Content

[0003] The purpose of the utility model is to provide a module for realizing SBC function based on discrete devices, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a module for realizing SBC function based on discrete devices, comprising a VBAT power supply terminal, an MCU microprocessor, a CAN chip, an LDO1 chip and an LDO2 chip, wherein the CAN chip, the LDO1 chip and the LDO2 chip are all connected to the VBAT power supply terminal, the CAN chip is communicatively connected to the MCU microprocessor through a CAN bus, and a VCC pin, a CAN_EN pin, a CAN_STB pin and an INH pin are provided on the CAN chip, the MCU microprocessor is respectively connected to the CAN_EN pin and the CAN_STB pin of the CAN chip through a CAN_EN signal line and a CAN_STB signal line, the LDO1 chip is provided with a voltage stabilizing output terminal VCC1 and an input terminal INH1, the voltage stabilizing output terminal VCC1 is connected to the VCC pin of the CAN chip, the LDO2 chip is provided with a voltage stabilizing output terminal VCC2 and an input terminal INH2, the voltage stabilizing output terminal VCC2 is connected to the MCU microprocessor, and the input terminal INH1 and the input terminal INH2 are both connected to the INH pin of the CAN chip.

[0005] The following improvements are made in the present application scheme: the CAN bus includes a CAN_TX signal line and a CAN_RX signal line, the CAN chip is provided with a CAN_TX pin and a CAN_RX pin, and the MCU microprocessor is connected to the CAN_TX pin and CAN_RX pin of the CAN chip respectively through the CAN_TX signal line and the CAN_RX signal line.

[0006] The following improvement is made in the solution of the present application: the CAN chip is further provided with a WAKE pin, and the WAKE pin is connected to a wake-up trigger signal.

[0007] The following improvement is made in the solution of the present application: the CAN chip is also provided with an ERR pin, and the ERR pin of the CAN chip is connected to the MCU microprocessor via an ERR signal line.

[0008] The following improvements are made in the present application scheme: the LDO2 chip is installed with an external watchdog, the MCU microprocessor is connected to the input terminal WD and the output terminal RESET of the LDO2 chip through the WD signal line and the RESET signal line respectively and performs watchdog monitoring, and the LDO2 chip receives the WD signal given by the MCU microprocessor and feeds back the RESET signal to the MCU microprocessor.

[0009] Compared with the prior art, the utility model provides a module for realizing SBC function based on discrete devices, which has the following beneficial effects:

[0010] The utility model replaces the SBC with discrete devices, and adopts a combination of discrete devices such as an MCU microprocessor, a CAN chip, and an LDO chip to realize the SBC function, thereby improving the utilization rate of the devices and optimizing the cost; when the system is powered on, the INH pin of the CAN chip outputs a high level, so that the LDO1 chip and the LDO2 chip work normally, and at the same time, the LDO1 chip provides a logic power supply for the CAN communication part of the CAN chip, and the LDO2 chip provides a VCC2 power supply for the MCU microprocessor, so that the MCU microprocessor can work normally; when the whole system is in a normal working mode, the MCU microprocessor outputs a high level to the CAN chip through a CAN_EN signal line and a CAN_STB signal line, so that the CAN chip enters a normal working mode, and the CAN chip communicates with the MCU microprocessor through a CAN bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural block diagram of the utility model. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiment of the present invention will be described below in conjunction with the accompanying drawings in the embodiment of the present invention:

[0013] like Figure 1 As shown, a module based on discrete devices to implement SBC function is applied to automotive electronic modules, including a VBAT power supply terminal, an MCU microprocessor, a CAN chip, an LDO1 chip and an LDO2 chip. The CAN chip of the system is connected to the vehicle body through a BCAN bus, wherein the BCAN bus includes a BCAN_L signal line and a BCAN_H signal line.

[0014] The CAN chip, LDO1 chip and LDO2 chip are all connected to the VBAT power supply terminal. The CAN chip is connected to the MCU microprocessor through the CAN bus. The CAN bus includes a CAN_TX signal line and a CAN_RX signal line. The CAN chip is provided with a CAN_TX pin and a CAN_RX pin. The MCU microprocessor is connected to the CAN_TX pin and the CAN_RX pin of the CAN chip respectively through the CAN_TX signal line and the CAN_RX signal line; the CAN chip is provided with a VCC pin, a CAN_EN pin, a CAN_STB pin, an INH pin, a WAKE pin and an ERR pin. The MCU microprocessor is connected to the CAN_EN pin and the CAN_STB pin of the CAN chip respectively through the CAN_EN signal line and the CAN_STB signal line. A voltage-stabilized output terminal VCC1 and an input terminal INH1 are provided, and the voltage-stabilized output terminal VCC1 is connected to the VCC pin of the CAN chip. A voltage-stabilized output terminal VCC2 and an input terminal INH2 are provided on the LDO2 chip, and the voltage-stabilized output terminal VCC2 is connected to the MCU microprocessor. The input terminals INH1 and INH2 are both connected to the INH pin of the CAN chip. The WAKE pin of the CAN chip is connected to a wake-up trigger signal, and the ERR pin of the CAN chip is connected to the MCU microprocessor through an ERR signal line. The LDO2 chip is equipped with an external watchdog, and the MCU microprocessor is respectively connected to the input terminal WD and the output terminal RESET of the LDO2 chip through a WD signal line and a RESET signal line and performs watchdog monitoring. The LDO2 chip receives the WD signal given by the MCU microprocessor and feeds back a RESET signal to the MCU microprocessor.

[0015] Working principle: When the system is powered on, the INH pin of the CAN chip gives a high level, allowing the LDO1 chip and the LDO2 chip to work normally. At the same time, the LDO1 chip provides logic power to the CAN communication part of the CAN chip, and the LDO2 chip provides VCC2 power to the MCU microprocessor, allowing the MCU microprocessor to work normally.

[0016] When the whole system is in normal working mode, CAN_EN and CAN_STB of MCU microprocessor output high level. After CAN_EN and CAN_STB of CAN chip receive high level, CAN chip enters normal working mode, ERR pin of CAN chip outputs high level to MCU microprocessor, INH pin of CAN chip maintains high level output, vehicle body communicates with CAN chip through BCAN bus, CAN chip communicates with MCU microprocessor through CAN bus, MCU microprocessor outputs periodic PWM signal to input terminal WD of LDO2 chip, and output terminal RESET of LDO2 chip continuously outputs low level to MCU microprocessor;

[0017] When the MCU microprocessor works abnormally and cannot provide periodic PWM signal feeding to the LDO2 chip, the MCU microprocessor feeding times out, and the output terminal RESET of the LDO2 chip gives a high level, trying to reset and restart the MCU microprocessor;

[0018] When the CAN chip detects some faults, such as the process of input power boosting from undervoltage to normal input voltage, CAN bus communication failure with MCU microprocessor, etc., the ERR pin of the CAN chip outputs a high level to the MCU microprocessor, so that the MCU microprocessor can take corresponding measures according to these fault diagnoses;

[0019] When the whole system needs to enter the sleep mode, the MCU microprocessor outputs a low level through the CAN_STB signal line and a high level through the CAN_EN signal line to put the CAN chip into the standby mode, and then the WAKE FLAG of the CAN chip is cleared, and the whole system enters the sleep mode;

[0020] When the whole system is in sleep mode, the INH pin of the CAN chip outputs a low level, making the LDO1 chip and the LDO2 chip unable to work, the CAN communication part of the CAN chip stops working, and the MCU microprocessor also stops working;

[0021] When the entire system needs to enter normal working mode from sleep mode, that is, wake up, the vehicle body can send any message to the CAN chip through the CAN bus to wake up the CAN chip from sleep mode. After the CAN chip starts to work normally, the entire system starts to enter normal working mode. The vehicle body can also give a trigger signal. After the WAKE pin of the CAN chip receives the wake-up trigger signal, the CAN chip wakes up from sleep mode. After the CAN chip starts to work normally, the entire system starts to enter normal working mode.

[0022] The above embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A module for implementing SBC functions based on discrete devices, characterized in that: The invention comprises a VBAT power supply terminal, an MCU microprocessor, a CAN chip, an LDO1 chip and an LDO2 chip, wherein the CAN chip, the LDO1 chip and the LDO2 chip are all connected to the VBAT power supply terminal, the CAN chip is communicatively connected to the MCU microprocessor via a CAN bus, and a VCC pin, a CAN_EN pin, a CAN_STB pin and an INH pin are arranged on the CAN chip, the MCU microprocessor is respectively connected to the CAN_EN pin and the CAN_STB pin of the CAN chip via a CAN_EN signal line and a CAN_STB signal line, the LDO1 chip is provided with a voltage stabilizing output terminal VCC1 and an input terminal INH1, the voltage stabilizing output terminal VCC1 is connected to the VCC pin of the CAN chip, the LDO2 chip is provided with a voltage stabilizing output terminal VCC2 and an input terminal INH2, the voltage stabilizing output terminal VCC2 is connected to the MCU microprocessor, and the input terminal INH1 and the input terminal INH2 are both connected to the INH pin of the CAN chip.

2. A module for implementing SBC functions based on discrete devices according to claim 1, characterized in that: The CAN bus includes a CAN_TX signal line and a CAN_RX signal line. The CAN chip is provided with a CAN_TX pin and a CAN_RX pin. The MCU microprocessor is connected to the CAN_TX pin and the CAN_RX pin of the CAN chip respectively through the CAN_TX signal line and the CAN_RX signal line.

3. A module for implementing SBC functions based on discrete devices according to claim 1, characterized in that: The CAN chip is also provided with a WAKE pin, and the WAKE pin is connected to a wake-up trigger signal.

4. The module for realizing SBC function based on discrete devices according to claim 1, characterized in that: The CAN chip is also provided with an ERR pin, and the ERR pin of the CAN chip is connected to the MCU microprocessor through an ERR signal line.

5. The module for realizing SBC function based on discrete devices according to claim 1, characterized in that: The LDO2 chip is equipped with an external watchdog. The MCU microprocessor is connected to the input terminal WD and the output terminal RESET of the LDO2 chip through the WD signal line and the RESET signal line respectively and performs watchdog monitoring. The LDO2 chip receives the WD signal given by the MCU microprocessor and feeds back the RESET signal to the MCU microprocessor.

Images