Introduction

Inter-Integrated Circuit for Sound (IIS) is a digital audio transmission standard defined by Philips in 1986 (revised in 1996). The standard is used for the transmission of digital audio data between internal devices of the system, such as codec, DSP, digital input/output interface, ADC, DAC and digital filter. The only relationship between I2S and I2C is that they are both defined by Philips.

I2S is a relatively simple digital interface protocol without address or device selection mechanism. On the I2S bus, only one master device and one source device can exist at a time. The master device may be a source device, or a target device, or other control devices that coordinate the source device and the target device.