bh3856fs ROHM Co. Ltd., bh3856fs Datasheet - Page 9

• Manufacturer Part Number: bh3856fs
• Description: 2-wire Serial Sound Control Ic
• Manufacturer: ROHM Co. Ltd.

Audio ICs
(2) I
(3) BH3856S / BH3856FS slave address
(4) Interface protocol
MSB
1) Basic protocol
2) Auto increment (Select address increases (+1) by the value of the data.)
3) Structure with which transmission is not possible (In this case, only select address 1 is set.)
1bit
S
S
S
S
A6
2
1
C BUS data format
MSB
MSB
MSB
MSB
(Example 1) The address data specified by select address is taken as data 1.
(Example 2) The address data specified by select address +1 is taken as data 2.
(Example 3) The address data specified by select address +N−1 is taken as data N.
Note : Following transmission of data, data transmitted as select address
Slave address
Slave address
Slave address
Slave address
• S
• Slave address = IC recognition. Upper 7 bits are random. Bottom bit is “L” for the sake of overwrite.
• A
• Select address = selection between volume, bass, treble and matrix surround.
• Data
• P
A5
• Slave address selection
0
2 will not be recognized as select address 2, but as data.
8bit
1) A = 1 (10000010) [SASS pin HIGH]
2) A = 0 (10000000) [SASS pin LOW]
A4
0
LSB
LSB
LSB
LSB
A3
0
A
1bit
A
A
A
= start condition (start bit recognition)
= acknowledge bit (recognition of acknowledgment)
= volume and tone data
= stop condition (stop bit recognition)
MSB
MSB
MSB
MSB
A2
Select address 1
0
Select address
Select address
Select address
A1
8bit
0
LSB
A0
A
LSB
LSB
LSB
A
1bit
R/W
A
A
A
MSB
0
LSB
Data
MSB LSB
MSB LSB
MSB
Data
Data
8bit
LSB
Data 1, data 2,...data N
A
1bit
A
A
MSB
Select address 2
1bit
P
P
BH3856S / BH3856FS
LSB
A
MSB
Data
LSB
LSB
A
A
P
P