The ADS816x includes an 8-channel, linear, and low-leakage current analog multiplexer. The multiplexer performs a break-before-make operation when switching channels. There are four modes of switching the multiplexer input channels: manual mode, on-the-fly mode, auto sequence mode, and custom channel sequencing mode.
These modes can be selected by configuring the SEQ_MODE[1:0] bits in the DEVICE_CFG register. On power-up the default mode is manual mode, SEQ_MODE[1:0] = 00b, and the default input channel is AIN0. The multiplexer configuration registers can be accessed over the SPI; see Figure 50. The SPI interface eliminates the need for separate MUX control lines.