Communicating with Daisy Chained MCP42XXX Digital Potentiometers
Craig L. King, Ezana Haile
The MCP41XXX and MCP42XXX family of digital potentiometers allow for daisy chaining of multiple devices on a single SPI? bus. It is possible to communicate to multiple devices using one 3-wire data bus (CS, CLK and DATA), by connecting the SO pin on one device to the SI pin of the next device in the chain. This application note details one example of source code that is used to communicate with eight daisy chained devices.
Potentiometer, Digital Potentiometer, MCP4XXXX, MCP41XXX, MCP42XXX, SPI, Daisy Chain