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ADS1118 spi 通信时序

yonlin pan
Prodigy 50 points
Other Parts Discussed in Thread: ADS1118

我用ADS1118做4路单端模拟信号的采集，按照DATASHEET 上的SPI时序从SDI引脚输入4BYTE的数据（配置字发送2次），SDO引脚一直保持为高电平。请问这是何种原因？望解答。