MOSA

MS6258

Gain And Attenuation Volume Controller IC

REV 1

7

www.mosanalog.com.tw

BUS INTERFACE

Data are transmitted to and from the MCU to the MS6258 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

MS6258

Interface protocol

The format consists of the following

‧A START condition

‧A chip address byte including the MS6258 address. (7bits)

‧The 8

‧MS6258 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

Pin1(A.O.) = Low or Open

1000

00

10

7 bits address

MS6258 address

W

Pin1(A.O.) = High

1000

00

11

7 bits address

MS6258 address

W