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ISO1050批量故障

Other Parts Discussed in Thread: ISO1050

一批板子中,出现了大量的通讯故障问题,发现是ISO1050坏了,CANH和CANL脚之间电阻由正常的5.2k左右变为无穷大,VCC2-GND2之间电阻变得很小,拉低了隔离电源。损坏原因不明,器件的共模耐压±12V,那么我用PESD1CAN(24V)接在CANH(或CANL)到GND2之间,是不是没有起到防护作用?手册上CANH或CANL有-27V到40V的耐压又是指什么?最重要的是损坏原因是什么?怎么更改?