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PIN38 is the START pin and should be tied to the MCU if you wish to control the devices operation with the MCU. If you would simply like to always have the device be active, then you could to tie the START pin to DVDD. I would recommend using the MCU to control PIN38.
PIN43 is the DOUT pin. There is continuous or single shot mode for reading data from the device and these modes are discussed in length in the datasheet. CS, SCLK, DIN and DOUT will all be tied to the MCU. Do you have specific questions in regards to these pins?
