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ADS1299 no response with 1.8V digital supply

Other Parts Discussed in Thread: ADS1299

Hi,

I got a problem by supplying the ADS1299 with 1.8V as a digital voltage. The spi sends an appropriate command to read the ADS register with 1.8v logic level by using an application processor (CortexA9) but it seems that the ADS is not happy. Here are other configurations:

Power down ->1.8V, Analog voltage 5V, ClkSEl -> 1.8V.

I should say also that when I used the ADS with 3.3V with different uC (Cortex M4) it works very well and I can activate all the features of this component. We got the same functionality by using CortexA8 with 3.3 logic supply as well.

So, I wonder if  there is any solutions or  similar problem that you faced?

Thanks