Thanks Bob for your reply. I will try to debug more details by monitoring the SPI communication, START/SYNC and DRDY pins. PS: May I have one more question: 1) If I plan to read ads124s08 data directly (without RDATA command). What is the difference between "read data direct" and "by RDATA command" in my /DRDY interrupt service code? In my understanding, according to page 16 of datasheet, Read Data Direct (Without an RDATA Command) Timing Requirements , just send 24 SCLKs (without STATUS and CRC) after /DRDY is enough? 2) What is the meaning of "Read data direct requires that no serial activity occur from the falling edge of DRDY to the read back, or the data are invalid." in section of 9.5.4.1 of datasheet?
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