Hardware Design Specification
ASD-B-16-0247 Rev1.3
Page 21 of 105
September 8, 2017
RTK00V2XRC7746SFS
3.4
Audio Codec Interfaces (SSI0, SSI1)
3.4.1
Specifications
The Tethys board incorporates an audio codec (AK4642EN, U29) which is connected to SSI0 and SSI1 of the R-Car W2H. For
details on the SSI, see the R-Car W2H Hardware Manual. For details on the AK4642EN, see the datasheet published by Asahi Kasei
Micro devices.
Table 7 SSI Codec Specifications
Controller
On-chip SSI0and SSI1 in the R-Car W2H
Audio codec
AK4642EN (U29) from AKM
I2C bus : Interface 1
I2C slave address
: 0x25 for read, 0x24 for write (CAD0= 0)
Master/slave mode
AK4642EN: Master/slave selectable(slave mode by default)
Audio connector
MIC IN (J1)
LINE-OUT( J1)
3.4.2
Block Diagram
U1
R-Car W2H
GP5_9/SSI_SCK0129_A
GP5_10/SSI_WS0129_A
U29
AUDIO
AK4642EN
GP5_11/SSI_SDATA0_A
LRCK
BICK
SDTI
0
0
0
GP5_21/SSI_SDATA1_A
0
SDTO
GP5_28/AUDIO_CLKA_A
22
MCKO
I2C Buffer
LTC4313IMS8-
1#PBF
CSN/CAD0
MCK
I
X3
12.288MHz
LOUT
ROUT
RIN1/IN1+
LIN1/IN1-
MPWR
2K 1%
J1
Line Out
J1
MIC In
Figure 4 Block Diagram of the Audio Codec Interface