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ADS7953: ADS7953SDBT

Part Number: ADS7953


hello to all,

I use this Serial Interface ADCs to read 16 channels of adc.

My uC is STM32H743BIT6.

After the isolator I connect 5 wires to see the data.

CS,MOSI and CLOCK looks ok but the device(Ads7953) don't send nothing ,always 0.

what can be the problem ? 

My code is very simple.

put CS low than send config to move channel and receives the data and then CS high.