Datasheet

MAX4548/MAX4549
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
14 ______________________________________________________________________________________
D2 D1 D0D3C6A1A5A7 D7C2C4 D6 D4D5C0C1C5 C3A0 C7A2A3A4A6
S
T
O
P
A
C
K
B
I
A
S
A001 C
O
M
1
B
C
O
M
1
C
A
C
K
C
O
M
1
A
C
O
M
2
A
C
O
M
2
C
C
O
M
2
B
0 C
L
I
C
K
A1 A
C
K
11S
R
T
0
Table 5. “WriteByte” Protocol
SRT = Start Condition
ACK = Acknowledge Condition
STOP = Stop Condition
SRT = Start Condition
ACK = Acknowledge Condition
STOP = Stop Condition
SRT = Start Condition
ACK = Acknowledge Condition
STOP = Stop Condition
Table 7. “SPI” Protocol
1Controls COM2B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D3
1Controls COM1B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D2
1Controls COM2A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D1
1Controls COM1C clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D4
1Controls COM2C clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D5
BIT
—
DESCRIPTION
D6
—
Don’t care
D7
POWER-UP
DEFAULT
STATE
Don’t care
Table 4. Clickless Mode Format (C7 = “1”)
ADDRESS BYTE COMMAND BYTE DATA BYTE
Controls COM1A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode.D0
1
C6A1A5A7 C2C4 C0C1C5 C3A0 C7A2A3A4A6
B
I
A
S
A001 C
O
M
1
B
C
O
M
1
C
A
C
K
C
O
M
1
A
C
O
M
2
A
C
O
M
2
C
C
O
M
2
B
0 C
L
I
C
K
A1 A
C
K
11S
R
T
0
D14 D10D12 D8D9D13 D11D15
A
C
K
D6 D3 D0D1D2D5 D4D7
A
C
K
S
T
O
P
ADDRESS BYTE COMMAND BYTE DATA WORD
Table 6. “WriteWord” Protocol
D7 D4D5 D2 D1 D0D3D6D15 D11D13 D9 D8D12 D10D14
C
L
I
C
K
C
O
M
2
B
C
O
M
2
C
C
O
M
2
A
C
O
M
1
A
C
O
M
1
C
C
O
M
1
B
B
I
A
S
C7 C3C5 C1 C0C4 C2C6
COMMAND BYTE DATA WORD