CX20921 AudioSmart Data Sheet

Table of Contents

Conexant Confidential

03/11/15

001DSR01

iv

Serial Peripheral Interface (SPI) Master........................................................................................................................... 15

External SPI Flash Requirements and Approved Devices List................................................................................. 16

Inter-Integrated Circuit (I2C) Slave................................................................................................................................... 17

I2C Data Flow Communication ................................................................................................................................. 17

Data Transfer on the I2C Bus ................................................................................................................................... 18

I2C Slave Address Format........................................................................................................................................ 19

I2C Interface Timing for 400kHz Mode ..................................................................................................................... 19

Universal Asynchronous Receiver/Transmitter (UART) ................................................................................................ 20

Digital Microphone Interface (DMIC)................................................................................................................................ 20

Sony/Philips Digital Interface Format (S/PDIF) Receiver .............................................................................................. 22

Integrated Interchip Sound (I2S) ...................................................................................................................................... 22

I2S Mode Timing....................................................................................................................................................... 23

Left-Justified Mode ................................................................................................................................................... 24

Right-Justified Mode ................................................................................................................................................. 24

Multiplexed Signals ........................................................................................................................................................... 25

Package Dimensions..................................................................................................................................................26

Package Thermal Data ...................................................................................................................................................... 27

CX20921 Device PCB Footprint........................................................................................................................................ 28

Ordering Information..................................................................................................................................................29