MOSA
I
2
C CONTROL INTERFACE
MS6865
3 Stereo inputs / 2W PA output with Volume Control
Data are transmitted to and from the MCU and MS6865 via the SDA and SCL. The SDA and SCL make up the
BUS interface. It should be noted that pull-up resistors must be connected to the positive supply voltage.
V
DD
Rp
Rp
Pull up resistors
SDA (Serial Data Line)
SCL (Serial Clock Line)
MCU
MS6865
I
2
C interface protocol
The format consists of the following:
•A
START condition
•A
chip address byte including the chip address. (7bits)
•The
8
th
bit of the byte must be “0”.(write=0, read=1)
•The
chip must always acknowledge the end of each transmitted byte.
•A
data sequence (N-bytes + Acknowledge)
•A
STOP condition
SDA
SCL
S
START
CONDITION
1-7
8
9
1-7
8
9
1-7
8
9
P
ADDRESS
R/W
ACK
DATA
ACK
DATA
ACK
STOP
CONDITION
I
2
C chip address
88H
1
0
0
0
1
0
0
0
W
7 bits address
REV 2
9/22
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MOSA [ MOSA ELECTRONICS ]
