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ADS1281的I/O口接线问题

Other Parts Discussed in Thread: ADS1281

我想使用ADS1281的SPI采集数据,各个引脚应该怎么连接?那些是必须用I/O口,那些可以直接上拉或下啦,如果想预留PIN模式,怎样用最少的I/O口接线,还有同步输入引脚的作用是什么?应该怎么接线?谢谢