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因为GPS模块部有上拉,而TXS010xx系列B port内部已经有上拉,这样导致两个电阻并联,电阻减小,Vol值提高。
所以一般不建议外部上下拉,或者已经内部集成上下拉的应用,外部上拉,直接影响的就是Vol的值,导致拉不下来。
或者建议您更换其他电平转换器件呢。