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1292数据采样读到全零的数据

Other Parts Discussed in Thread: ADS1292

我们现在使用1292做ECG数据采集,采样率设置在1K Hz。通过data ready中断读两路ECG数据。用同一块电路板,正常使用时90%的情况都能正常读出数据,出问题时读到的数据为零。通过逻辑分析仪检测,发现出问题时SPI MISO线数据始终为低,此时CPU的SPI的clock是正常的,同时1292的data ready中断的也正常,读完3个寄存器(status,ecg0,ecg1)后data ready会正常恢复,直到下次采样。这可能是什么原因造成的?