User Guide

CCS Technical Documentation System Module and User Interface

NEM-2

Stereo Codec

Two different interfaces are used between DSP and codec, which runs in master mode:

• I2C control interface

• audio data interface (I2S)

I2C control interface is used for transferring low speed control information between

application DSP and codec. Signal specification of the control interface is given below.

Audio data is transferred via I2S serial digital audio interface. Signal specification of the

audio data interface is listed below.

Ringing Tone Speaker Amplifier

Ringing Tone Speaker amplifier shut down pin is connected to ADSP GPIO. Signal specifi-

cation is given below.

Symbol Parameter Min. typ. Max. Unit Note

SDA serial data 0 3.3 V IIC data line, external 10k pull-

up used

SDL serial clock 0 3.3 V IIC clock line, external 10k pull-

up used

Symbol Parameter Min. typ. Max. Unit Note

SDATA_IN serial data 0 3.3 V serial data DSP -> codec

SDATA_OUT serial data 0 3.3 V serial data codec -> DSP

LRCIN frame sync. 0 3.3 V frame sync. DSP -> codec

LRCOUT frame sync. 0 3.3 V frame sync. codec -> DSP

BCLK Clock 0 3.3 V clock codec -> DSP

Symbol Parameter Min. typ. Max. Unit Note

APAShutDown shut down 0 3.3 V external pull- down