CN-224218382-U - Low-power consumption CAN communication circuit controlled by autonomous power failure

Abstract

The utility model relates to a low-power consumption CAN communication circuit for realizing automatic power-off control, which is used for realizing communication between a controller unit and a CAN bus and comprises a CAN transceiver chip, an N-channel MOS tube, a P-channel MOS tube, an inductor, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein a grid electrode of the P-channel MOS tube is connected with a VCC pin of the CAN transceiver chip through the source electrode of a first resistor and a power input end, a grid electrode of the N-channel MOS tube is connected with a GPIO pin of the controller unit through the third resistor, a grid electrode of the N-channel MOS tube is connected with a source electrode of a grounding end through the fourth resistor and a drain electrode of the grounding end through a second resistor R2, and the inductor is connected between a CANL pin, a CANH pin and a differential signal receiving terminal of the CAN transceiver chip. The utility model CAN realize complete power-off of the CAN transceiver chip when no communication exists, solves the problem of static power consumption of the communication chip in an idle state and supports a rapid wake-up function.

Inventors

• LIU LIFENG
• WANG RAN

Assignees

• 沃尔特电子（苏州）有限公司

Dates

Publication Date

20260508

Application Date

20250414

Claims (10)

1. 1. The low-power consumption CAN communication circuit is used for realizing communication between a controller unit and a CAN bus and is characterized by comprising a CAN transceiver chip, an N-channel MOS tube, a P-channel MOS tube, an inductor, a first resistor, a second resistor, a third resistor and a fourth resistor; The grid electrode of the P-channel MOS tube is connected with the source electrode of the power input end through a first resistor and the VCC pin of the CAN transceiver chip, and the drain electrode of the P-channel MOS tube is connected to the power input end; The grid electrode of the N-channel MOS tube is connected with the GPIO pin of the controller unit through a third resistor, the grid electrode of the N-channel MOS tube is connected with the ground terminal through a fourth resistor, and the drain electrode of the N-channel MOS tube is connected with the grid electrode of the P-channel MOS tube through a second resistor R2; The inductor is connected between a CANL pin, a CANH pin and a differential signal receiving terminal of the CAN transceiver chip.
2. 2. The self-power-down controlled low power consumption CAN communication circuit of claim 1, wherein the CAN transceiver chip further comprises a TXD pin, a GND pin, a SPLIT pin and a STB pin, wherein the GND pin and the STB pin are connected with a ground terminal, and the TXD pin is connected with a data transmitting terminal of the microcontroller and is used for receiving a data signal from the MCU.
3. 3. The self-powered-off controlled low power CAN communication circuit of claim 2, further comprising a decoupling capacitor coupled between the SPLIT pin of the CAN transceiver chip and ground for filtering power supply noise.
4. 4. The CAN communication circuit with low power consumption controlled by autonomous power failure of claim 3, further comprising a differential signal protection device, wherein one end of the differential signal protection device is connected with the inductor, and the other end is connected with the grounding terminal.
5. 5. The self-powered down controlled low power consumption CAN communication circuit of claim 4 wherein said differential signal protection device is a bi-directional TVS diode array.
6. 6. The self-power-off controlled low-power-consumption CAN communication circuit of claim 1, wherein when the GPIO pin is configured to be high level, the N-channel MOS tube and the P-channel MOS tube are conducted, the CAN transceiver chip supplies power, and when the GPIO pin is configured to be low level, the N-channel MOS tube and the P-channel MOS tube are powered off, the CAN transceiver chip is powered off.
7. 7. The self-power-down controlled low power consumption CAN communication circuit of claim 1, wherein the differential signal receiving terminals comprise a CANH terminal and a CANL terminal for transmitting high and low signals of a CAN bus, respectively.
8. 8. The self-power-off control low-power consumption CAN communication circuit of claim 1, wherein the first resistor is used for keeping the grid voltage of the P-channel MOS tube at a high level and keeping the P-channel MOS tube at a cut-off state when no signal is driven.
9. 9. The self-power-off control low-power consumption CAN communication circuit of claim 1, wherein the second resistor is used for pulling down the grid voltage of the P-channel MOS transistor when the N-channel MOS transistor is conducted so as to control the conduction of the P-channel MOS transistor.
10. 10. The self-powered-off control low-power consumption CAN communication circuit of claim 1, wherein the third resistor and the fourth resistor are used for controlling the grid voltage of the N-channel MOS transistor so as to realize the conduction control of the N-channel MOS transistor.

Description

Low-power consumption CAN communication circuit controlled by autonomous power failure Technical Field The utility model relates to the technical field of communication, in particular to a low-power consumption CAN communication circuit controlled by autonomous power failure. Background CAN communication is a serial communication protocol widely used in the fields of automobiles, industrial automation and the like. The method can realize efficient and reliable data transmission among a plurality of devices and has the advantages of high anti-interference capability, strong real-time performance and the like. In many devices, CAN communication functions are an essential component for enabling collaborative work and information interaction between devices. Currently, most devices using CAN communication remain powered when they enter a standby mode of operation. For example, some automotive electronics remain powered by the CAN communication module within the vehicle after the vehicle is turned off, so as to receive and transmit data at any time. This approach, while ensuring that the device can quickly respond to a communication request in a standby state, results in a waste of static power consumption of the product. This waste of power consumption is particularly problematic in some applications where power consumption is a concern, such as battery powered portable devices or remote monitoring devices. In order to reduce the static power consumption of products, some product devices are realized by a software dormancy method. Specifically, when the device enters a standby mode, the CAN communication module is put into a sleep state through software control, thereby reducing the power consumption thereof. However, this approach has some drawbacks. Firstly, the power supply of the CAN communication circuit part is not completely cut off, and a certain leakage phenomenon still exists, so that the power consumption cannot be further reduced. Secondly, the method is relatively dependent on MCU control, the response speed from high power consumption to low power consumption is relatively slow, and the method cannot meet the requirements of application scenes with high real-time requirements. Disclosure of utility model Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art, provide the low-power consumption CAN communication circuit controlled by autonomous power-off, realize complete power-off when the CAN transceiver chip has no communication, support a rapid wake-up function and effectively solve the static power consumption problem of the communication chip in an idle state. In order to solve the technical problems, the utility model provides a low-power consumption CAN communication circuit for autonomous power-off control, which is used for realizing communication between a controller unit and a CAN bus and comprises a CAN transceiver chip, an N-channel MOS tube, a P-channel MOS tube, an inductor, a first resistor, a second resistor, a third resistor and a fourth resistor; The grid electrode of the P-channel MOS tube is connected with a source electrode of a power input end through a first resistor and a VCC pin of the CAN transceiver chip, the drain electrode of the P-channel MOS tube is connected to the power input end, the grid electrode of the N-channel MOS tube is connected with a GPIO pin of the controller unit through a third resistor, the grid electrode of the N-channel MOS tube is connected with a grounding end through a fourth resistor, the drain electrode of the N-channel MOS tube is connected with the grid electrode of the P-channel MOS tube through a second resistor R2, and the inductor is connected among a CANL pin, a CANH pin and a differential signal receiving terminal of the CAN transceiver chip. In one embodiment of the present utility model, the CAN transceiver chip further includes a TXD pin, a GND pin, a SPLIT pin, and a STB pin, the GND pin and the STB pin are connected to a ground terminal, and the decoupling capacitor is connected between the SPLIT pin and the ground terminal of the CAN transceiver chip, for filtering power noise. In one embodiment of the utility model, the differential signal protection device further comprises a differential signal protection device, wherein one end of the differential signal protection device is connected with the inductor, and the other end of the differential signal protection device is connected with the ground terminal. In one embodiment of the present utility model, the differential signal protection device is a bidirectional TVS diode array D1. In one embodiment of the utility model, when the GPIO pin is configured to be at a high level, the N-channel MOS tube and the P-channel MOS tube are conducted, the CAN transceiver chip is powered, and when the GPIO pin is configured to be at a low level, the N-channel MOS tube and the P-channel MOS tube are powered off, and the CAN transceiver c