【经验】瑞萨功能安全PMIC掉电与CAN Transceiver唤醒异常之间的关系分析

时间： 2023-01-13 来源：世强

技术问答

瑞萨功能安全PMIC RAA271001，RAA271050给R CAR V3M供电，而整个电源的开关在于CAN Transceiver唤醒触发RAA271050工作输出5V给二级PMIC RAA271001,本文记录三者之间的关系和影响。

首先看一下原理图：

此处原理图重CAN_INH为CAN Transceiver在收到心跳报文正常时的输出12V，经过R13013和R13019分压得到Power12V_EN作为RAA271050的EN使能输入，从而使RAA271050正常输出5V电源,以及VSYS12V_PG给二级PMIC RAA271001.

RAA271050正常输出5V电源，以及VSYS12V_PG分别给RAA271001的输入，EN从而使RAA271001正常输出buck1-5，LDO1-2，保障R CAR V3M系统的电源正常。而当CAN Transceiver的心跳报文出现中断就会使其进入休眠状态，并导致INH掉电：

其中VBAT_FILT汽车电池供电12V，视为不掉电，这样就保证CAN Transceiver的12V始终有电，收不到CAN报文时进入休眠状态，INH掉电，RAA271050的EN关断从而关掉RAA271001的输入，整个系统都会掉电，CAN Transceiver的CAN_D3.3V，CAN_D5.0V都会掉电。

只有给CAN Transceiver发送唤醒报文，从而输出INH，使得RAA271050，RAA271001正常工作，输出的CAN_D3.3V，CAN_D5.0V也正常给CAN Transceiver供电，这样就可以使整个can收发正常，并保持can心跳的正常。

在实车上CAN Transceiver会接入CAN总线并接收唤醒和心跳报文，而在研发阶段可以通过上位机通过PCAN,CANOE等工具发唤醒和心跳报文给CAN Transceiver来模拟实车。

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