8.5.7.1 32-Bit Data Transmission Cycle

The data in a 32-bit data transmission cycle consist of four bytes: two bytes for the conversion result, and an additional two bytes for the Config register readback. The device always reads the MSB first.

Write the same Config register setting twice during one transmission cycle as shown in Figure 13. If convenient, write the Config register setting once during the first half of the transmission cycle, and then hold the DIN pin either low (as shown in Figure 14) or high during the second half of the cycle. If no update to the Config register is required, hold the DIN pin either low or high during the entire transmission cycle. The Config register setting written in the first two bytes of a 32-bit transmission cycle is read back in the last two bytes of the same cycle.

1. CS can be held low if the ADS1018 does not share the serial bus with another device. If CS is low, DOUT/DRDY asserts low indicating new data are available.

Figure 13. 32-Bit Data Transmission Cycle With Config Register Readback

1. CS can be held low if the ADS1018 does not share the serial bus with another device. If CS is low, DOUT/DRDY asserts low indicating new data are available.

Figure 14. 32-Bit Data Transmission Cycle: DIN Held Low