The user observed a 140ns step in the CAN signal's start bit, which is a known behavior of the ADM3055 transceiver. This occurs after the transceiver has been in the recessive state for more than 25ms, due to an internal protective circuit being incorrectly triggered. The issue does not affect the functionality of the CAN communication as the VOD remains sufficient for dominant state recognition. This characteristic is also present in other transceivers using the same die, such as ADM3050E, ADM3056, ADM3057, and ADM3058.
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按照手册推荐电路搭建的CAN控制器电路，在系统中测试信号发现信号侦的起始位上升沿始终存在一个约140ns的台阶，而后面的数据位都没有这个台阶。是因为芯片DCDC电源驱动能力问题吗？