Hi Hang Lee, Welcome to the TI E2E Forums! I'm glad to hear you were able to resolve your issue! If you run into a similar issues again, just keep in mind that the ADS1261 always responds with 0xFF when it is expecting a new command (in some infrequent cases 0xFF may also be a CRC byte), and then the device echoes back the command it received. In your case, it looks like the SPI mode may not have been configured for CPOL = 0, CPHA = 1, since the echoed back command didn't match the command you had sent. Let us know if you have any additional questions. Best regards, Chris
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