28035在低温负20度CAN通讯不正常。用示波器测试信号有进到28035,但是28035没有返回信号。把温度慢慢升高,CAN通讯逐渐恢复,到0度以上CAN通讯恢复正常。隔离光耦用的ISO1050。在负20度时,CAN的5V电源测试正常,28035驱动的LED灯显示正常。
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