WO2020135261A1 - Can bus communication circuit for use in electric bicycle - Google Patents

Can bus communication circuit for use in electric bicycle Download PDF

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WO2020135261A1
WO2020135261A1 PCT/CN2019/127050 CN2019127050W WO2020135261A1 WO 2020135261 A1 WO2020135261 A1 WO 2020135261A1 CN 2019127050 W CN2019127050 W CN 2019127050W WO 2020135261 A1 WO2020135261 A1 WO 2020135261A1
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pin
capacitor
grounded
resistor
diode
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PCT/CN2019/127050
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French (fr)
Chinese (zh)
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孙敏
王小雷
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南京懂玫驱动技术有限公司
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Publication of WO2020135261A1 publication Critical patent/WO2020135261A1/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring

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  • the utility model relates to a CAN bus technology, in particular to a CAN bus communication circuit for electric bicycles.
  • UART Universal Asynchronous Receiver/Transmitter
  • the UART communication port can only transmit one signal in one direction and only one binary bit at a time. When transmitting a byte of information, it can only be transmitted one by one.
  • the highest rate of UART is 56k, the extra overhead accounts for more than 30%, and each extra data byte requires at least 4 bits of extra overhead. Therefore, simply for the point-to-point communication rate, UART is far less than the controller area network (Controller Area Network, CAN).
  • UART communication is generally limited to simple short-distance data communication. It has limitations for the control of signal circuits in electric vehicles. .
  • the present invention provides a CAN bus communication circuit for electric bicycles with low cost and stable data communication.
  • a CAN bus communication circuit for electric bicycles including an 8-pin CAN communication chip, and pin 1 of the 8-pin CAN communication chip is a high-level output Pin TX, pin 4 is a low-level output pin RX, pin 2 is grounded, pin 3 is connected to a 5V power supply, pin 8 is grounded through resistor R1, and pin 7 is the signal input terminal CANH,
  • the 6th pin is the signal input terminal CANL, and the 5th pin is connected to the 5V power supply and is grounded through the capacitor C1.
  • pin 7 of the 8-pin CAN communication chip is connected to one end of the resistor R3, the other end of the resistor R3 is grounded through a capacitor C2, and pin 6 of the CAN communication chip is connected to one end of the resistor R2, The other end of the resistor R2 is also grounded through the capacitor C2, and the other end of the resistor R2 is connected to the other end of the resistor R3.
  • the 6th pin is connected to a polar plate of the capacitor C3, and the 6th pin is also connected to the negative electrode of the diode D1, the diode D1 is connected in parallel with the capacitor C3, and the anode of the diode D1 is connected to the other electrode of the capacitor C3
  • the boards are grounded.
  • the 7th pin is connected to a polar plate of the capacitor C4, and the 7th pin is also connected to the negative electrode of the diode D2, the diode D2 is connected in parallel with the capacitor C4, and the anode of the diode D2 is connected to the other electrode of the capacitor C4
  • the boards are grounded.
  • the utility model has the following advantages: the CAN bus communication circuit for electric bicycles of the utility model has the advantages of strong real-time, long transmission distance, strong anti-electromagnetic interference ability, low cost, etc.; adopts two-wire serial Communication mode, strong error detection ability, can work in high noise interference environment; with priority and arbitration function, multiple control modules are hung on the controller LAN bus (ControLLer Area Network-Bus, CAN-bus) through the CAN controller , To form a multi-host local network; can decide to receive or block the message according to the ID of the message; reliable error handling and error detection mechanism; after the information sent is damaged, it can be automatically resent; the node is in a serious error situation It has the function of automatically exiting the bus; the message does not contain the source address or the destination address, and only uses the identifier to indicate the function information and priority information.
  • the controller LAN bus ControLLer Area Network-Bus, CAN-bus
  • FIG. 1 is a circuit schematic diagram of a CAN bus communication circuit for an electric bicycle of the present invention.
  • a CAN bus communication circuit for electric bicycles includes an 8-pin CAN communication chip, the 8-pin CAN communication chip refers to a CAN communication chip with 8 pins, and the No. 1 tube of the 8-pin communication chip Pin is high level output pin TX, pin 4 is low level output pin RX, pin 2 is grounded, pin 3 is connected to 5V power supply, where 5V refers to voltage 5V, pin 8 Ground through resistor R1, pin 7 is the signal input terminal CANH, pin 6 is the signal input terminal CANL, pin 5 is connected to a 5V power supply and grounded through capacitor C1, where 5V refers to a voltage of 5V; the 8 Pin 7 of the CAN communication chip is connected to one end of the resistor R3, the other end of the resistor R3 is grounded through a capacitor C2, pin 6 of the CAN communication chip is connected to one end of the resistor R2, and the other end of the resistor R2 One end is also grounded through capacitor C2, while the other end of resistor R2 is connected to the other end of resistor R3,
  • pin 1 can also be called the first pin
  • pin 2 can also be called the second pin
  • pin 3 can also be called the third pin
  • pin 4 can also be called the first pin
  • pin 5 can also be called the fifth pin
  • pin 6 can also be called the sixth pin
  • pin 7 can also be called the seventh pin
  • pin 8 can also be called It is the eighth pin.
  • the CAN controller works in a multi-master mode, and each node in the network can use the lossless structure of bit-wise arbitration to compete to send data to the bus according to the bus access priority (depending on the message identifier), and the CAN protocol.
  • the CAN bus is connected to the physical bus through the two output terminals CANH and CANL of the CAN controller interface chip, and the state of the CANH terminal of the CAN controller interface chip can only be high or floating, and the CANL terminal can only be low or Suspended state. This ensures that there will be no phenomenon in the RS-485 network, that is, when the system has errors and multiple nodes send data to the bus at the same time, the bus will appear short circuit, which will damage some nodes.
  • the CAN node has an automatic output shutdown function in the case of serious errors, so that the operation of other nodes on the bus is not affected, so as to ensure that it does not appear in the network. Due to problems with individual nodes, the bus is "deadlocked" status.
  • the CAN controller works in a multi-master mode, and each node in the network can use the lossless structure of bit-wise arbitration to compete to send data to the CAN bus according to the bus access priority (depending on the message identifier), and the CAN protocol is abolished Station address coding, instead of encoding the communication data, which allows different nodes to receive the same data at the same time, these characteristics make the data communication between the nodes of the CAN bus network real-time.
  • CAN has the perfect communication protocol which can be realized by CAN controller chip and its interface chip, which greatly reduces the difficulty of system development and shortens the development cycle.
  • the CAN bus has many features such as high communication rate, easy implementation, and high cost performance. It is also easy to form a redundant structure, which improves the reliability and flexibility of the system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Small-Scale Networks (AREA)

Abstract

CAN bus technology, specifically relating to a low-cost CAN communication circuit with stable data communication for use in an electric bicycle, comprising an 8-pin CAN communication chip, pin 1 of the 8-pin CAN communication chip being a high level output pin TX, pin 4 being a low level output pin RX, pin 2 being grounded, pin 3 being connected to a 5V power source, pin 8 being grounded by means of a resistor R1, pin 7 being a signal input terminal CANH, pin 6 being a signal input terminal CANL, and pin 5 being both connected to a 5V power source and grounded by means of a capacitor C1.

Description

一种电动自行车用CAN总线通信电路CAN bus communication circuit for electric bicycle 技术领域Technical field
本实用新型涉及一种CAN总线技术，具体涉及一种电动自行车用CAN总线通信电路。The utility model relates to a CAN bus technology, in particular to a CAN bus communication circuit for electric bicycles.
背景技术Background technique
目前电动车内的仪表、灯光等电路均采用通用异步收发传输器(Universal Asynchronous Receiver/Transmitter，UART)通信，UART通信端口，在一个方向上只能传送一路信号，一次只能传送一个二进制位，传送一个字节信息时，只能一位一位地依次传送。UART的最高速率为56k，额外开销占30％多，及每传1个数据字节至少需要4个位的额外开销。所以，单纯针对点对点的通信速率，UART是远不及控制器局域网络(Controller Area Network,CAN)的，UART通信一般限于简单的短距离的数据通信，对于电动车内的信号电路控制，具有局限性。At present, instruments, lights and other circuits in electric vehicles use Universal Asynchronous Receiver/Transmitter (UART) communication. The UART communication port can only transmit one signal in one direction and only one binary bit at a time. When transmitting a byte of information, it can only be transmitted one by one. The highest rate of UART is 56k, the extra overhead accounts for more than 30%, and each extra data byte requires at least 4 bits of extra overhead. Therefore, simply for the point-to-point communication rate, UART is far less than the controller area network (Controller Area Network, CAN). UART communication is generally limited to simple short-distance data communication. It has limitations for the control of signal circuits in electric vehicles. .
实用新型内容Utility model content
针对现有技术中的上述不足，本实用新型提供一种成本低且数据通信稳定的电动自行车用CAN总线通信电路。In view of the above deficiencies in the prior art, the present invention provides a CAN bus communication circuit for electric bicycles with low cost and stable data communication.
为实现以上技术目的,本实用新型的技术方案是:一种电动自行车用CAN总线通信电路，包括8管脚CAN通信芯片，所述8管脚CAN通信芯片的1号管脚为高电平输出管脚TX，4号管脚为低电平输出管脚RX，2号管脚接地，3号管脚接5V电源，8号管脚通过电阻R1接地，7号管脚为信号输入端CANH，6号管脚为信号输入端CANL，5号管脚接5V电源同时通过电容C1接地。To achieve the above technical objectives, the technical solution of the present invention is: a CAN bus communication circuit for electric bicycles, including an 8-pin CAN communication chip, and pin 1 of the 8-pin CAN communication chip is a high-level output Pin TX, pin 4 is a low-level output pin RX, pin 2 is grounded, pin 3 is connected to a 5V power supply, pin 8 is grounded through resistor R1, and pin 7 is the signal input terminal CANH, The 6th pin is the signal input terminal CANL, and the 5th pin is connected to the 5V power supply and is grounded through the capacitor C1.
作为优选，所述8管脚CAN通信芯片的7号管脚接电阻R3的一端，所述电阻R3的另一端通过电容C2接地，所述CAN通信芯片的6号管脚接电阻R2的一端，所述电阻R2的另一端也通过电容C2接地，同时电阻R2的另一端与电阻R3的另一端连接。Preferably, pin 7 of the 8-pin CAN communication chip is connected to one end of the resistor R3, the other end of the resistor R3 is grounded through a capacitor C2, and pin 6 of the CAN communication chip is connected to one end of the resistor R2, The other end of the resistor R2 is also grounded through the capacitor C2, and the other end of the resistor R2 is connected to the other end of the resistor R3.
作为优选，所述6号管脚接电容C3的一极板，同时6号管脚还接二极管D1的负极，所述二极管D1与电容C3并联，同时二极管D1的正极与电容C3的另一极板均接地。Preferably, the 6th pin is connected to a polar plate of the capacitor C3, and the 6th pin is also connected to the negative electrode of the diode D1, the diode D1 is connected in parallel with the capacitor C3, and the anode of the diode D1 is connected to the other electrode of the capacitor C3 The boards are grounded.
作为优选，所述7号管脚接电容C4的一极板，同时7号管脚还接二极管D2的负极，所述二极管D2与电容C4并联，同时二极管D2的正极与电容C4的另一极板均接地。Preferably, the 7th pin is connected to a polar plate of the capacitor C4, and the 7th pin is also connected to the negative electrode of the diode D2, the diode D2 is connected in parallel with the capacitor C4, and the anode of the diode D2 is connected to the other electrode of the capacitor C4 The boards are grounded.
以上描述可以看出，本实用新型具备以下优点：本实用新型的电动自行车用CAN总线通信电路具有实时性强、传输距离较远、抗电磁干扰能力强、成本低等优点；采用双线串行通信方式，检错能力强，可在高噪声干扰环境中工作；具有优先权和仲裁功能，多个控制模块通过CAN控制器挂到控制器局域网总线(ControLLer Area Network-Bus，CAN-bus)上，形成多主机局部网络；可根据报文的ID决定接收或屏蔽该报文；可靠的错误处理和检错机制；发送的信息遭到破坏后，可自动重发；节点在错误严重的情况下具有自动退出总线的功能；报文不包含源地址或目标地址，仅用标志符来指示功能信息、优先级信息。As can be seen from the above description, the utility model has the following advantages: the CAN bus communication circuit for electric bicycles of the utility model has the advantages of strong real-time, long transmission distance, strong anti-electromagnetic interference ability, low cost, etc.; adopts two-wire serial Communication mode, strong error detection ability, can work in high noise interference environment; with priority and arbitration function, multiple control modules are hung on the controller LAN bus (ControLLer Area Network-Bus, CAN-bus) through the CAN controller , To form a multi-host local network; can decide to receive or block the message according to the ID of the message; reliable error handling and error detection mechanism; after the information sent is damaged, it can be automatically resent; the node is in a serious error situation It has the function of automatically exiting the bus; the message does not contain the source address or the destination address, and only uses the identifier to indicate the function information and priority information.
附图说明BRIEF DESCRIPTION
图1为本实用新型的电动自行车用CAN总线通信电路的电路示意图。FIG. 1 is a circuit schematic diagram of a CAN bus communication circuit for an electric bicycle of the present invention.
具体实施方式detailed description
下面结合本实用新型给定的附图和具体示例，进一步阐述本实用新型，应理解这些实施例仅用于说明本实用新型而不用于限制本实用新型的范围，基于本实用新型的实施例，本领域普通技术人员在没有创造性劳动的前提下所获得的所有其他实施例。都属于本实用新型的保护范围。The following further describes the present invention in conjunction with the drawings and specific examples given by the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Based on the embodiments of the present invention, All other embodiments obtained by those of ordinary skill in the art without creative work. All belong to the protection scope of the utility model.
一种电动自行车用CAN总线通信电路，包括8管脚CAN通信芯片，所述8管脚CAN通信芯片是指带有8个管脚的CAN通信芯片，所述8管脚通信芯片的1号管脚为高电平输出管脚TX，4号管脚为低电平输出管脚RX，2号管脚接地，3号管脚接5V电源，其中，5V是指电压为5V，8号管脚通过电阻R1 接地，7号管脚为信号输入端CANH，6号管脚为信号输入端CANL，5号管脚接5V电源同时通过电容C1接地，其中，5V是指电压为5V；所述8管脚CAN通信芯片的7号管脚接电阻R3的一端，所述电阻R3的另一端通过电容C2接地，所述CAN通信芯片的6号管脚接电阻R2的一端，所述电阻R2的另一端也通过电容C2接地，同时电阻R2的另一端与电阻R3的另一端连接，其中，电阻R3的另一端是指电阻R3与电容C2相连接的一端；所述6号管脚接电容C3的一极板，同时6号管脚还接二极管D1的负极，所述二极管D1与电容C3并联，同时二极管D1的正极与电容C3的另一极板均接地；所述7号管脚接电容C4的一极板，同时7号管脚还接二极管D2的负极，所述二极管D2与电容C4并联，同时二极管D2的正极与电容C4的另一极板均接地。A CAN bus communication circuit for electric bicycles includes an 8-pin CAN communication chip, the 8-pin CAN communication chip refers to a CAN communication chip with 8 pins, and the No. 1 tube of the 8-pin communication chip Pin is high level output pin TX, pin 4 is low level output pin RX, pin 2 is grounded, pin 3 is connected to 5V power supply, where 5V refers to voltage 5V, pin 8 Ground through resistor R1, pin 7 is the signal input terminal CANH, pin 6 is the signal input terminal CANL, pin 5 is connected to a 5V power supply and grounded through capacitor C1, where 5V refers to a voltage of 5V; the 8 Pin 7 of the CAN communication chip is connected to one end of the resistor R3, the other end of the resistor R3 is grounded through a capacitor C2, pin 6 of the CAN communication chip is connected to one end of the resistor R2, and the other end of the resistor R2 One end is also grounded through capacitor C2, while the other end of resistor R2 is connected to the other end of resistor R3, where the other end of resistor R3 refers to the end where resistor R3 is connected to capacitor C2; the pin 6 is connected to capacitor C3 One pole plate, at the same time, the 6th pin is also connected to the negative electrode of the diode D1, the diode D1 is connected in parallel with the capacitor C3, and the positive electrode of the diode D1 and the other pole plate of the capacitor C3 are both grounded; the 7th pin is connected to the capacitor C4 At the same time, pin 7 is also connected to the negative electrode of diode D2, which is connected in parallel with capacitor C4, and the anode of diode D2 and the other electrode plate of capacitor C4 are both grounded.
其中，1号管脚也可以称为第一管脚，2号管脚也可以称为第二管脚，3号管脚也可以称为第三管脚，4号管脚也可以称为第四管脚，5号管脚也可以称为第五管脚，6号管脚也可以称为第六管脚，7号管脚也可以称为第七管脚，8号管脚也可以称为第八管脚。Among them, pin 1 can also be called the first pin, pin 2 can also be called the second pin, pin 3 can also be called the third pin, pin 4 can also be called the first pin Four pins, pin 5 can also be called the fifth pin, pin 6 can also be called the sixth pin, pin 7 can also be called the seventh pin, pin 8 can also be called It is the eighth pin.
CAN控制器工作于多主方式,网络中的各节点都可根据总线访问优先权(取决于报文标识符)采用无损结构的逐位仲裁的方式竞争向总线发送数据,且CAN协议。The CAN controller works in a multi-master mode, and each node in the network can use the lossless structure of bit-wise arbitration to compete to send data to the bus according to the bus access priority (depending on the message identifier), and the CAN protocol.
CAN总线通过CAN控制器接口芯片的两个输出端CANH和CANL与物理总线相连,而CAN控制器接口芯片的CANH端的状态只能是高电平或悬浮状态,CANL端只能是低电平或悬浮状态。这就保证不会出现在RS-485网络中的现象,即当系统有错误,出现多节点同时向总线发送数据时,导致总线呈现短路,从而损坏某些节点的现象。而且CAN节点在错误严重的情况下具有自动关闭输出功能,以使总线上其他节点的操作不受影响,从而保证不会出现象在网络中,因个别节点出现问题,使得总线处于“死锁”状态。CAN控制器工作于多主方式,网络中的各节点都可根据总线访问优先权(取决于报文标识符)采用无损结构的逐位仲裁的方式竞争向CAN总线发送数据,且CAN协议废除了站地址 编码,而代之以对通信数据进行编码,这可使不同的节点同时接收到相同的数据,这些特点使得CAN总线构成的网络各节点之间的数据通信实时性。The CAN bus is connected to the physical bus through the two output terminals CANH and CANL of the CAN controller interface chip, and the state of the CANH terminal of the CAN controller interface chip can only be high or floating, and the CANL terminal can only be low or Suspended state. This ensures that there will be no phenomenon in the RS-485 network, that is, when the system has errors and multiple nodes send data to the bus at the same time, the bus will appear short circuit, which will damage some nodes. In addition, the CAN node has an automatic output shutdown function in the case of serious errors, so that the operation of other nodes on the bus is not affected, so as to ensure that it does not appear in the network. Due to problems with individual nodes, the bus is "deadlocked" status. The CAN controller works in a multi-master mode, and each node in the network can use the lossless structure of bit-wise arbitration to compete to send data to the CAN bus according to the bus access priority (depending on the message identifier), and the CAN protocol is abolished Station address coding, instead of encoding the communication data, which allows different nodes to receive the same data at the same time, these characteristics make the data communication between the nodes of the CAN bus network real-time.
CAN具有的完善的通信协议可由CAN控制器芯片及其接口芯片来实现,从而大大降低系统开发难度,缩短了开发周期。另外,与其它现场总线比较而言,CAN总线是具有通信速率高、容易实现、且性价比高等诸多特点并且容易构成冗余结构,提高系统的可靠性和系统的灵活性。CAN has the perfect communication protocol which can be realized by CAN controller chip and its interface chip, which greatly reduces the difficulty of system development and shortens the development cycle. In addition, compared with other field buses, the CAN bus has many features such as high communication rate, easy implementation, and high cost performance. It is also easy to form a redundant structure, which improves the reliability and flexibility of the system.
以上对本实用新型及其实施方式进行了描述，该描述没有限制性，附图中所示的也只是本实用新型的实施方式之一，实际的结构并不局限于此。总而言之如果本领域的普通技术人员受其启示，在不脱离本实用新型创造宗旨的情况下，不经创造性的设计出与该技术方案相似的结构方式及实施例，均应属于本实用新型的保护范围。The present invention and its embodiments have been described above. The description is not restrictive. The drawings shown are only one of the embodiments of the present invention, and the actual structure is not limited to this. In a word, if the ordinary technicians in this field are inspired by this, without deviating from the purpose of creating the utility model, without creatively designing the similar structural methods and embodiments as the technical solution, they should all belong to the protection of the utility model. range.

Claims (4)

  1. 一种电动自行车用CAN总线通信电路，其特征在于：包括8管脚CAN通信芯片，所述8管脚CAN通信芯片的1号管脚为高电平输出管脚TX，4号管脚为低电平输出管脚RX，2号管脚接地，3号管脚接5V电源，8号管脚通过电阻R1接地，7号管脚为信号输入端CANH，6号管脚为信号输入端CANL，5号管脚接5V电源同时通过电容C1接地。A CAN bus communication circuit for electric bicycles, characterized by comprising an 8-pin CAN communication chip, pin 1 of the 8-pin CAN communication chip is a high-level output pin TX, and pin 4 is low Level output pin RX, pin 2 is grounded, pin 3 is connected to 5V power supply, pin 8 is grounded through resistor R1, pin 7 is the signal input terminal CANH, pin 6 is the signal input terminal CANL, Pin 5 is connected to the 5V power supply and grounded through capacitor C1.
  2. 根据权利要求1所述的电动自行车用CAN总线通信电路，其特征在于：所述8管脚CAN通信芯片的7号管脚接电阻R3的一端，所述电阻R3的另一端通过电容C2接地，所述CAN通信芯片的6号管脚接电阻R2的一端，所述电阻R2的另一端也通过电容C2接地，同时电阻R2的另一端与电阻R3的另一端连接。The CAN bus communication circuit for an electric bicycle according to claim 1, wherein the pin 7 of the 8-pin CAN communication chip is connected to one end of a resistor R3, and the other end of the resistor R3 is grounded through a capacitor C2. Pin 6 of the CAN communication chip is connected to one end of the resistor R2, the other end of the resistor R2 is also grounded through the capacitor C2, and the other end of the resistor R2 is connected to the other end of the resistor R3.
  3. 根据权利要求1所述的电动自行车用CAN总线通信电路，其特征在于：所述6号管脚接电容C3的一极板，同时6号管脚还接二极管D1的负极，所述二极管D1与电容C3并联，同时二极管D1的正极与电容C3的另一极板均接地。The CAN bus communication circuit for an electric bicycle according to claim 1, wherein the pin 6 is connected to a polar plate of the capacitor C3, and the pin 6 is also connected to the cathode of the diode D1, and the diode D1 is The capacitor C3 is connected in parallel, and the anode of the diode D1 and the other plate of the capacitor C3 are both grounded.
  4. 根据权利要求1所述的电动自行车用CAN总线通信电路，其特征在于：所述7号管脚接电容C4的一极板，同时7号管脚还接二极管D2的负极，所述二极管D2与电容C4并联，同时二极管D2的正极与电容C4的另一极板均接地。The CAN bus communication circuit for an electric bicycle according to claim 1, wherein the pin 7 is connected to a polar plate of the capacitor C4, and the pin 7 is also connected to the cathode of the diode D2, and the diode D2 is connected to The capacitor C4 is connected in parallel, and the anode of the diode D2 and the other plate of the capacitor C4 are both grounded.
PCT/CN2019/127050 2018-12-29 2019-12-20 Can bus communication circuit for use in electric bicycle WO2020135261A1 (en)

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CN209118135U (en) * 2018-12-29 2019-07-16 南京懂玫驱动技术有限公司 A kind of automobile-used CAN bus telecommunication circuit of electrical salf-walking

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EP1189393B1 (en) * 2000-09-15 2005-04-13 Robert Bosch Gmbh Accessing and/or controlling CAN node arrangements, including vehicle control units, during vehicle operation
CN203025697U (en) * 2012-12-29 2013-06-26 广东志成冠军集团有限公司 Circuit capable of controlling multiple CAN (Controller Area Network) interfaces by single SPI (Single Program Initiation) bus
CN103812743A (en) * 2014-02-21 2014-05-21 合肥国轩高科动力能源股份公司 CAN bus communication circuit
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