MOSA

MS6712L

Low Cost 4 Stereo Inputs / 4-Channel Outputs Audio Processor

REV 2

9/14

www.mosanalog.com

Interface Protocol

The format consists of the following

•A START condition

•A chip address byte including the MS6712L address. (7bits)

•The 8

•MS6712L 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

Address Code

The chip address of the MS6712L is 88H.

1

0

0

0

0

0

1

0

7 bits address

MS6712L address

W

Data Bytes Description

The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are

mute and the gains of the input stage, the bass and the treble are 0dB.

MSB

LSB

Function

0

0

B2

B1

B0

A2

A1

A0

Volume Control

1

1

0

B1

B0

A2

A1

A0

Speaker ATT LR

1

1

1

B1

B0

A2

A1

A0

Speaker ATT RR

1

0

0

B1

B0

A2

A1

A0

Speaker ATT LF

1

0

1

B1

B0

A2

A1

A0

Speaker ATT RF

0

1

0

G1

G0

S2

S1

S0

Audio Switch

0

1

1

0

C3

C2

C1

C0

Bass Control

0

1

1

1

C3

C2

C1

C0

Treble Control

Where Ax = 1.25dB/step; Bx = 10dB/step; Cx = 2dB/step; Gx = 3.75dB/step