MOSA
BUS INTERFACE
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Data are transmitted to and from the MCU to the MS6257 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
MS6257
Interface protocol
The format consists of the following
‧A
START condition
‧A
chip address byte including the MS6257 address. (7bits)
‧The
8
th
bit of the byte must be “0”.(write=0, read=1)
‧MS6257
must always acknowledge the end of each transmitted byte.
‧A
data sequence (N-bytes + Acknowledge)
‧A
STOP condition
SDA
SCL
1-7
8
9
1-7
8
9
1-7
8
9
S
START
CONDITION
ADDRESS
R / --
W
ACK
DATA
ACK
DATA
ACK
P
STOP
CONDITION
Protocol Address
1
0
0
0
1
0
0
0
W
7 bits address
MS6257 address
REV 1
7
www.mosanalog.com
MOSA [ MOSA ELECTRONICS ]
