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ADS1299EEGFE-PDK: ADS1299 DRDY signal reverse

Part Number: ADS1299EEGFE-PDK
Other Parts Discussed in Thread: ADS1299

Hi TI,

     I find when I use START command to start the ADS1299, the DRDY signal is abnormal. The wave is as below.

     User guide tells me when the data is ok, DRDY signal from high to low, but in my wave, it is reverse,  I think there must be something wrong with my setting, could you give me some advice?