MOSA

MS6272

Volume Controller with soft step IC

V1.4

7/19

www.mosanalog.com

BUS INTERFACE

Data are transmitted to and from the MCU to the MS6272 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.

SDA (Serial Data Line)

Rp

Rp

SCL (Serial Clock Line)

Pull up resistors

MCU

MS6272

Interface protocol

The format consists of the following

•A START condition

•A chip address byte including the MS6272 address. (7bits)

•The MS6272 must always acknowledge the end of each transmitted byte.

•A data sequence (N-bytes + Acknowledge)

•A STOP condition

SCL

SDA

1-7

8

9

1-7

8

9

9

8

1-7

S

P

ADDRESS

--

ACK

ACK

ACK

DATA

DATA

START

CONDITION

STOP

CONDITION

ACK

Start

ACK

Sub Address

ACK

MS6272 Address

1

0

0

0

0

0

1

0

Data

STOP

MSB

LSB

Chip Address

The chip address of the MS6272 is 88H.

1

0

0

0

0

0

1

0

7 bits address

MS6272 address

W