Additional Information
Inter-IC Sound interface (I²S) is a serial bus protocol developed by Philips Semiconductors. I²S is a serial link dedicated to data transfer between ICs in digital audio systems. It consists of three lines: serial data (SD) for two time-division multiplexed channels; left/right channel word select (WS); and a serial clock (SCL), which allows the receiver and transmitter to have the same clock signal for data transmission.
For more information on the I²S protocol please visit
NXP website.