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关于TM129C的管脚5V容忍

各位专家,我看了下TM129参考设计文档,他有一句话说除了PB1都不能5V容忍,但是我以前的设备是用STm32设计的,里面有很多5V是直接接到了管脚上,那么这个芯片是不是就不能了,就要加电平转换芯片么?如果不加,管脚会烧掉还是工作不稳定啊?有没有过这方面的实验?