QUALCOMM Incorporated
Mixed signal device address assignment

Abstract:

Systems, methods, and apparatus for improving addressability of slave devices coupled to a serial bus are described. A method the slave device includes delaying transitions in a control signal received at an input pin of the slave device, enabling a counter after detecting a delayed first transition in the control signal, where the counter is configured to count pulses on a data line of a serial bus, transmitting a first pulse on the data line of the serial bus after enabling the counter, counting the first pulse and one or more additional pulses on the data line of the serial bus, and using an output of the counter to generate a unique identifier used for communicating over the serial bus. Each of a plurality of slave devices may be configured to transmit one of the additional pulses on the serial bus after the first transition occurs in the control signal.