ADS1256: No clock signal Input on ADS1256 XTAL pin.

Hi Anurag,

Welcome to the TI E2E Forums!

Are you using the ADS1256EVM in conjunction with your waveshare board, or do you have a custom-made PCB for the ADS1256? If you're using a custom PCB, would you be able to share a schematic?

The ADS1256 does not have any internal clock generation circuitry, so it requires either an external crystal or clock source. Figure 22 in the ADS1256 datasheet shows an example connection to a crystal. For a full schematic example, you could also reference the schematic of the ADS1256EVM-PDK, near the end of the User's Guide (link: http://www.ti.com/lit/pdf/sbau090).

...Once you have a clock provided to the ADC, and the GPIO pins for /RESET and /PWDN are set high, you ought to see a periodic pulse on the /DRDY pin; that will tell you that the ADC is actively converting. The next step after that would be to try to read and write to the device registers to ensure your SPI communication is working.

Best regards,
Chris