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AFE4490SPO2EVM: Afe4490spo2evm use with external microcontroller

Part Number: AFE4490SPO2EVM
Other Parts Discussed in Thread: AFE4490,

Hi, I want to use the afe4490spo2evm with an external microcontroller. I have problem with receiving the SPI data. I first write to the Control0 register to enable SPI read and then I read another register I have tried reading all the registers but there is no reply from afe4490. 

I have removed the resistors which are used for SPI and DRDY , AFE PDN and RESET which connects to onboard microcontroller as mentioned in one of the TI forums. 

I am using NRF52833 DK board whose lines voltage level is 3V. 

Please let me know what could be the problem. I am receiving the DRDY interrupts on oscilloscope. Also if I connect the PDN pin to nrf it stops giving pulses on DRDY pin no matter PDN high or low when I connect the PDN pin the pulses stops.