Primary bus to secondary bus multiplexing for I2C and other serial buses

摘要: A computer or other electronic system includes a primary I 2 C bus and plurality of secondary buses that can be selectively coupled to the bus. The is input an I/O expander, which has unique address on bus, switch. Each one outputs switch, are controlled by control inputs. Activating selected switch couples corresponding controller addresses expander then transmits data byte activates output expander. through delay circuit. circuit delays activation until after acknowledge bit stop have been communicated over so switching from another occurs at appropriate time.