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SBC CAN MC33905 CAN_H/L Signal issue

Question asked by andrew wu on Jun 21, 2018

SBC CAN MC33905 CAN_H/L signal rising and falling edges abnormal(The picture attached). It is not smooth but step in rising and falling edges. The step frequency is related to CAN slew rate. In Fast slew rate, the step frequency is about 100MHz and in Slow slew rate, the step frequency changed to about 25MHz. These steps on the rising and falling edges will cause EMC fail.