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ads1278芯片采集不到电压值

Other Parts Discussed in Thread: ADS1278

各位大神,用ads1278芯片遇到如下问题,ads1278与stm32用spi通讯,ADS1278的各个电压均测正常。CLKDIV接高电平,Format 为001, mode 为01 即high,sync设置为高电平,DIN接地,DOUT1接STM32的MISO。SPI设置为全双工模式,用示波器测的sclk波形正常,但是用ads1278通道采集电压数据时候一直显示如图(未采集数据时也这样显示),采集通道接了1.8v电 压数据显示依然如图,不知道是怎么回事?请各位大神指点下思路~在线等