CAN communication circuit and CAN communication system

Abstract

This invention relates to the field of CAN communication technology, providing a CAN communication circuit and a CAN communication system. In this communication circuit, the CANH terminal of the CAN transceiver is connected to one end of a first resistor and the first port of an external circuit interface; the other end of the first resistor is connected to one end of a first capacitor and the third port of the external circuit interface; the other end of the first capacitor is grounded. The CANL terminal of the CAN transceiver is connected to one end of a second resistor and the second port of the external circuit interface; the other end of the second resistor is connected to one end of a second capacitor and the fourth port of the external circuit interface; the other end of the second capacitor is grounded. When the CANH and CANL terminals of the CAN transceiver are connected to terminating resistors, the third and fourth ports are short-circuited. This invention achieves the connection of the CAN communication circuit to a terminating resistor without changing the hardware structure of the CAN communication circuit, unifying the hardware circuit of the CAN communication circuit and reducing the complexity of hardware management.

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