MOSA

MS6274

Volume Controller with soft step IC

V1.5

8/19

www.mosanalog.com

BUS INTERFACE

Data are transmitted to and from the MCU to the MS6274 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

MS62674

Interface protocol

The format consists of the following

•A START condition

•A chip address byte including the MS6274 address. (7bits)

•The MS6274 must always acknowledge the end of each transmitted byte.

•A data sequence (N-bytes + Acknowledge)

•A STOP condition

ACK

Start

ACK

Sub Address

ACK

MS6274 Address

1

0

0

0

0

0

1

0

Data

STOP

MSB

LSB

Chip Address

The chip address of the MS6274 is 88H.

1

0

0

0

0

0

1

0

MS6274 address

SubAddress

MSB

LSB

Function

A7

A6

A5

A4

A3

A2

A1

A0

0

0

0

0

0

0

0

0

Soft-step time / ON/OFF , SE/DIFF Selector

0

0

0

0

0

0

0

1

L-channel Input selector / Input Gain Control

0

0

0

0

0

0

1

0

R-channel Input selector / Input Gain Control

0

0

0

0

0

0

1

1

Both channels Input selector / Input Gain Control

0

0

0

0

0

1

0

0

L-channel Volume Control

0

0

0

0

0

1

0

1

R-channel Volume Control

0

0

0

0

0

1

1

0

Both channels Volume Control

0

0

0

0

0

1

1

1

Power management