很晕的东西-希望大家帮解决下

lijunchao410

我现在遇到非常郁闷的问题
1）pcf8574p与sop8574t的区别，网上也没有中文资料。英文的介绍一样
但我试验发现他们两个不能共用，谁能告诉我原因。急！很急的，帮帮忙！
2）我用串口显示采样的数据，发现零飘比较大。我用了12路采样，但就是有两路的零飘很大，运算放大器也没有损坏。

millwood0

the difference between p and t versions is the packaging: dip vs. soc.

there is also an "a" version which has different address than the p and t version but you didn't mention it.

otherwise, have no idea what your problems are.

lijunchao410

直插的PCF8574P与贴片的PCF8574T管脚是16角的，但我用的时候不能互用

lijunchao410

1楼希望能给解决下