8.5.7 Data Retrieval

Data is written to and read from the ADS1018 in the same manner for both single-shot and continuous conversion modes, without having to issue any commands. The operating mode for the ADS1018 is selected by the MODE bit in the Config register.

Set the MODE bit to 0 to put the device in continuous-conversion mode. In continuous-conversion mode, the device is constantly starting new conversions even when CS is high.

Set the MODE bit to 1 for single-shot mode. In single-shot mode, a new conversion only starts by writing a 1 to the SS bit.

The conversion data are always buffered, and retain the current data until replaced by new conversion data. Therefore, data can be read at any time without concern of data corruption. When DOUT/DRDY asserts low, indicating that new conversion data are ready, the conversion data are read by shifting the data out on DOUT/DRDY. The MSB of the data (bit 15) on DOUT/DRDY is clocked out on the first SCLK rising edge. At the same time that the conversion result is clocked out of DOUT/DRDY, new Config register data are latched on DIN on the SCLK falling edge.

The ADS1018 also offers the possibility of direct readback of the Config register settings in the same data transmission cycle. One complete data transmission cycle consists of either 32 bits (when the Config register data readback is used) or 16 bits (only used when the CS line can be controlled and is not permanently tied low).