MOSA

MS6266

6-Channel Electronic Volume Controller

REV1

7

www.mosanalog.com.tw

BUS INTERFACE

Data are transmitted to and from the MCU to the MS6266 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

V

DD

MCU

MS6266

Interface protocol

The format consists of the following

‧A START condition

‧A chip address byte including the MS6266 address. (7bits)

‧The 8

‧MS6266 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 MS6266 has four address codes, they were selected by AC1(pin17)and AC2(pin4).

AC1

AC2

Address code

0

0

80H

0

1

84H

1

0

88H

1

1

8CH

AC1=1, AC2=0

1000

00

10

7 bits address

MS6266 address

W