MAXIM INTEGRATED Interface IC - analogue switches QSOP 28 : Datasheet : Page 12

MAX4571–MAX4574

Serially Controlled, Clickless

Audio/Video Switches

12 ______________________________________________________________________________________

Address Byte Command Byte (RESET)

MSB

S

R

T

01101A

1

A

0

0A

C

K

00XXXXXXA

C

K

S

T

P

XXXXXSW

11

SW

10

SW

9

A

C

K

SW

8

SW

7

SW

6

SW

5

SW

4

SW

3

SW

2

SW

1

A

C

K

S

T

P

XXSW

8

SW

5

SW

7B

SW

7A

SW

6B

SW

6A

A

C

K

SW

4B

SW

4A

SW

3B

SW

3A

SW

2B

SW

2A

SW

1B

SW

1A

A

C

K

S

T

P

XXSW

8

SW

5

SW

7B

SW

7A

SW

6B

SW

6A

A

C

K

SW

4B

SW

4A

SW

3B

SW

3A

SW

2B

SW

2A

SW

1B

SW

1A

A

C

K

S

T

P

XXXXXSW

11

SW

10

SW

9

A

C

K

SW

8

SW

7

SW

6

SW

5

SW

4

SW

3

SW

2

SW

1

A

C

K

S

T

P

S

R

T

01101A

1

A

0

0A

C

K

1

1XXXXXXA

C

K

S

R

T

01101A

1

A

0

0A

C

K

01XXXXXXA

C

K

LSB

MSB LSB

Command Byte (SWITCHSET)

Command Byte (MODESET)

MSB LSB

Address Byte

First Data Byte

MSB

LSB

Second Data Byte

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

Address Byte

MSB

LSB

First Data Byte

MSB

LSB

Second Data Byte

MSB

MSBMSB

MSB

X = Don't Care

SRT = Start Condition

ACK = Acknowledge Condition

STP = Stop Condition

Logic "0" in any data bit location places the associated switch open or in soft (clickless) switching mode.

Logic "1" in any data bit location places the associated switch closed or in hard switching mode.

For command bit configuration see Table 1.

RESET Command

SWITCHSET Command

MAX4571

MAX4572

MAX4571

MAX4572

MODESET

Command

Table 3. 2-Wire Serial-Interface Data Format