Technical Note

10/25

BD37524FS

www.rohm.com

2010.03 - Rev.A

© 2010 ROHM Co., Ltd. All rights reserved.

MSB

LSB

MSB

LSB

MSB

LSB

S

Slave Address

A

Select Address

A

Data

A

P

1bit

8bit

1bit

8bit

1bit

8bit

1bit 1bit

S

= Start conditions (Recognition of start bit)

Slave Address

= Recognition of slave address. 7 bits in upper order are voluntary.

The least significant bit is “L” due to writing.

A

= ACKNOWLEDGE bit (Recognition of acknowledgement)

Select Address = Select every of volume, bass and treble.

Data

= Data on every volume and tone.

P

= Stop condition (Recognition of stop bit)

1）Basic form

S

Slave Address

A

Select Address

A

Data

A

P

MSB

LSB

MSB

LSB

MSB

LSB

2）Automatic increment (Select Address increases (+1) according to the number of data.

S

Slave Address

A

Select Address

A

Data1

A

Data2

A

････

DataN

A

P

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

(Example) ①Data1 shall be set as data of address specified by Select Address.

②Data2 shall be set as data of address specified by Select Address +1.

③DataN shall be set as data of address specified by Select Address +N-1.

3）Configuration unavailable for transmission (In this case, only Select Address1 is set.

S

Slave Address

A

Select Address1

A

Data

A

Select Address 2

A

Data

A

P

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

（Note）If any data is transmitted as Select Address 2 next to data, it is

recognized as data, not as Select Address 2.

（４）Slave address

MSB

LSB

A6

A5

A4

A3

A2

A1

A0

R/W

1

0

0

0

0

0

0

0

80H