SBOS487B June 2009 – March 2020 PGA280
The PGA280 can generate an extended chip select (ECS) for other devices that are connected to the same SPI wires: SDO, SDI, and SCLK. This ECS signal redirects the SPI communication to the connected device, while the PGA280 ignores data and SCLK. The CS signal to the PGA280 must stay low during such communication; as soon as CS returns high, SPI communication is terminated. See the section for details.