Design Of Transceiver Chip Based On CAN Bus

After CAN bus was proposed in 1986,it has been widespreadly used in industry and automobile.With the fast development of electronic informatization of automobiles,the transmission rate of the classic CAN bus of up to 1 Mbps has gradually become a limitation for its promotion.In order to conform the requirements of high-speed communication,in 2011,the CAN FD standard with a transmission rate of up to 10 Mbps was proposed.So far,domestic automobile chips based on CAN FD bus technology are almost blank,and they are completely monopolized by foreign manufacturers.In order to better realize localization,this article focuses on the key technology of transceivers which based on CAN FD bus technology.Mainly as follows:(1)Based on the international standard ISO11898 of the CAN bus and referring to the corresponding foreign products,the overall architecture of a CAN FD transceiver with a maximum transmission rate of 5 Mbps is proposed,and the dynamic and static parameters of the transceiver are deeply analyzed.(2)Based on the 0.18 ?m 70 V high-voltage BCD process,the key circuits of the transceiver,such as reference,transmitter module,receiver module,dominant timeout/over-temperature/under-voltage protection module are designed and simulated at the same time;Carried out the design of low power consumption mode and MCU compatibility,including the introduction of wake-up detection mode.As it is based on automotive integrated circuits,safety logic is designed in terms of functional safety.(3)After the overall design was completed,the overall simulation of the transceiver was carried out.The typical cycle delay less than 100ns;it has two working mode: normal mode and low-power mode.In normal mode,the power consumption of dominant state is 48 mA,the power consumption of recessive state is 2.6 mA,and the power consumption is only 12 ?A in low-power mode;compatible MCU with 5 V and 3.3 V power supply specifications.Finally,the layout of the chip is designed.The work of this paper has paid the way for the localization of CAN FD transceivers,and has played a role in inducing the development of subsequent work in this field.