JAJSGG2C October 2018 – June 2019 ADS125H02
In continuous-conversion mode, DRDY is driven high when conversions are started and is driven low when conversion data are ready. During data readback, DRDY is driven high, which indicates completion of the read operation. If the conversion data are not read, DRDY remains low and pulses high 16 fCLK cycles prior to the next falling edge.
To read back the current conversion data before the next conversion completes, send the read data command at least 16 fCLK cycles prior to the DRDY falling edge. If the readback command is sent less than 16 fCLK cycles prior to the DRDY falling edge, either the previous or new conversion data are provided. The timing of the command determines whether previous or new data are provided. In the event that previous data are provided, DRDY transitioning to low is suspended until after the read data operation completes. In this case, the DRDY bit of the STATUS0 byte is low to indicate that the previous data have already been read. In the event that new conversion data are provided, DRDY transitions low as normal. The DRDY bit of the STATUS0 byte is high to indicate new data are read. To ensure readback of new conversion data, wait until DRDY asserts low before starting the data read operation.