MOSA

MS6257

GAIN AND ATTENUATION VOLUME CONTROLLER IC

REV 1

7

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BUS INTERFACE

Data are transmitted to and from the MCU to the MS6257 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

MS6257

Interface protocol

The format consists of the following

‧A START condition

‧A chip address byte including the MS6257 address. (7bits)

‧The 8

‧MS6257 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

Protocol Address

1000

00

10

7 bits address

MS6257 address

W