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sn65hvd50发热疑问

Other Parts Discussed in Thread: SN65HVD50

最近在使用SN65hvd50进行数据通信,发现这个片子在待机空闲的情况下温升有10℃以上,是在没有外接连线,没有任何匹配电阻的情况下,R和D测试均为低电平!如果在通信条件下温升有20多摄氏度。查找原因无果,换过不同批次的片子情况相同,麻烦大神给个指点!!!