The DOUT/DRDY pin is the serial interface data output. This pin also provides the conversion-data ready output. The function of the pin changes whether a read data (or read register) operation is in progress. With CS1 low and when not reading register or conversion data, the pin indicates when data are ready by asserting low. For conversion data and register read operations, the pin function changes to data output. When the read operation is completed, the function changes back to the data-ready signal. In the data output mode, data are updated on the SCLK rising edge and the data is therefore latched by the host on the SCLK falling edge. CS1 must be low for DOUT/DRDY to provide the data-ready function. When both chip-select pins are high, DOUT/DRDY is in high-impedance mode (tri-state).