ADS1242: Can not read registers

Bryan,

No, I don't have any response and a crystal doesn't vibrate,

Attaching the schematic connection, do you see any problem here?

The ADC power + nPWDN have a stable 3.3V 

Hi Eduard Dubinin,

The crystal circuit looks okay, the load capacitance could probably be a bit higher (usually each load cap is 2-3pF higher compared to the rated load capacitance, which is 18pF for your crystal).

Can you try removing the crystal and applying a clock signal directly to the XIN pin on the ADS1242?

-Bryan

Thank you Bryan,

I will try to apply an external clock,

Can I supply different frequency than datasheet suggested to receive a conversion?

Eduard

Hi Eduard Dubinin,

The range of clock options for the ADS1242 is given in the datasheet, and is shown below. Note that the output data rates will scale will the different clock frequencies. This is discussed a bit in the Modulator section on page 11 in the datasheet.

-Bryan

Hi Bryan,

Thank you,

I provide an external clock of 1.5MHz 

unfortunately device still not responding,

I am sending a 0x1000 and should get at least IC ID, am i right ?

Any additional ideas how to make it response... ?

Hi Eduard Dubinin,

Please confirm that you have checked the VDD supply voltage at the ADC pin, and it is valid?

Have you also measured the clock frequency at the XIN pin to make sure it is oscillating at the correct frequency?

The ADC should begin toggling DRDY if the power supplies, clocks are valid, and there is solid, stable ground connection

If this is not the case perhaps you have a damaged ADC. Do you have another device you can swap out to check?

-Bryan