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ADS1271 数据输出不对

Other Parts Discussed in Thread: ADS1271

ADS1271按上图连接,参考电压为2.5V,CLK为27M,SCLK为6.75M,SYNC接高电平。

问题1     是DRDY信号平时为低,数据转换完毕来个高电平;

问题 2    是数据输出一直为FF  FF  FF

请问这是什么原因?