Skyworks Solutions, Inc.
AUTO-ENUMERATION OF PERIPHERAL DEVICES ON A SERIAL COMMUNICATION BUS

Abstract:

Each device on a bus auto-enumerates at power up or reset to assign a unique address to the device based on the resistance value of an external resistor. A current source supplies a current to a terminal to which a resistor is coupled. Each device has a resistor attached with a different resistance value. Each device senses the voltage at the terminal and the voltage corresponds to the unique device address on the bus. Following enumeration, the devices on the bus are individually addressable using their unique address.