Datasheet

MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
12 ______________________________________________________________________________________
SCL
SDA
ACKACK
SRT
ACK
A7 D0D0
A0 D7 D7
STOP
Figure 1. 2-Wire Serial-Interface Timing Diagram
SCL
A B C D
E
F G
H
I
J
SDA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
A = START CONDITION
B = MSB OF ADDRESS BYTE
C = LSB OF ADDRESS BYTE
D = ACKNOWLEDGE CLOCKED INTO MASTER
E = MSB OF COMMAND BYTE
F = LSB OF COMMAND BYTE
G = ACKNOWLEDGE CLOCKED INTO MASTER
H = MSB OF DATA BYTE
I = LSB OF DATA BYTE
J = ACKNOWLEDGE CLOCKED INTO MASTER
Figure 2. 2-Wire Serial-Interface Timing Details
Table 5. 2-Wire Serial-Interface Data Format
0 1
A
5
A
4
ADDRESS BYTE
A
0
0 B
I
A
S
A
U
X
1S
R
T
A
1
A
0
1 A
1
0
C
5
C
4
COMMAND BYTE
C
O
M
2
A
C
O
M
1
A
XA
C
K
C
1
C
0
C
O
M
2
B
C
O
M
1
B
A
3
A
2
X
C
3
C
2
C
7
C
6
D
5
D
4
D
5
D
4
DATA BYTE
D
1
D
0
D
7
A
C
K
D
1
D
0
D
3
D
2
D
6
D
3
D
2
D
7
D
6
A
C
K
A
7
A
6
X = Don’t care
SRT = Start condition
ACK = Acknowledge condition
STOP = Stop condition
S
T
O
P