MAX7369 Maxim Integrated Products, MAX7369 Datasheet - Page 13

• Manufacturer Part Number: MAX7369
• Description: (MAX7367 - MAX7369) 4-Channel I2C Switches / Multiplexer
• Manufacturer: Maxim Integrated Products

Figure 7. MAX7368 Control Register
Figure 8. MAX7369 Control/Interrupt Register
Each channel selected contains an SD_ and SC_ pair.
Select a channel by writing a control byte after a success-
ful acknowledge of the slave address. The last 4 bits of the
control byte determine which channel(s) is selected for the
MAX7367/MAX7368 as shown in Table 1. The last 3 bits of
the control byte determine which channel is selected for
the MAX7369 as shown in Table 2. The selected channels
are activated after the stop condition. When a channel is
selected, the respective SD_/SC_ pair is logic-high, ensur-
ing no false conditions occur on the bus.
The MAX7367/MAX7369 have four interrupt inputs, one for
each channel, and one INT output. The INT output is an
open-drain output that requires a pullup resistor. The INT
output is asserted by a low-logic signal on any of the INT_
inputs, and it is deasserted only when all the INT_ inputs
are logic-high. Bits 4–7 of the MAX7367/MAX7369
control/interrupt register store the state of the INT_ for
each channel as shown in Table 3 and Figures 6 and 8.
The logic level of INT_ is not latched. Drive the respective
INT_ input high to remove the interrupt condition for the
channel. An interrupt can occur on any channel, regard-
less of whether it is selected or not selected.
X = DON'T CARE.
X
7
X = DON'T CARE.
INT3
7
6
X
INTERRUPT BITS
INT2
(READ ONLY)
6
X
5
INT1
Interrupt Logic (MAX7367/MAX7369)
5
ENABLE BIT
______________________________________________________________________________________
X
4
INT0
4
B3
CHANNEL SELECTION BITS
3
X
3
(READ/WRITE)
4-Channel I
B2
2
B2
CHANNEL SELECTION BITS
2
B1
1
Channel Selection
(READ/WRITE)
B1
1
B0
0
B0
0
CHANNEL 0
CHANNEL 1
CHANNEL 2
CHANNEL 3
2
C Switches/Multiplexer
Table 1. MAX7367/MAX7368 Control Bits
for Channel Selection
Table 2. MAX7369 Control Bits for
Channel Selection
Table 3. MAX7367/MAX7369 Interrupt
Indicator Bits
After a device generates an interrupt on one of the
channels, the interrupt input is loaded into the
control/interrupt register when a read is performed. To
determine which device is generating the interrupt,
read the contents of the control/interrupt register to
determine which channel is issuing the interrupt, then
write the appropriate command to the control/interrupt
register to select the interrupted channel. Read from all
devices on the interrupted channel to determine the
exact source of the interrupt.
B2
0
0
1
1
1
1
INTERRUPT BIT
CONTROL BIT
INT0
INT1
INT2
INT3
B1
B0
B1
B2
B3
0
X
0
0
1
1
B0
0
X
0
1
0
1
No channel selected (default)
No channel selected
Channel 0 selected
Channel 1 selected
Channel 2 selected
Channel 3 selected
0 = Channel 0 disabled (default)
1 = Channel 0 enabled
0 = Channel 1 disabled (default)
1 = Channel 1 enabled
0 = Channel 2 disabled (default)
1 = Channel 2 enabled
0 = Channel 3 disabled (default)
1 = Channel 3 enabled
0 = No channel 0 interrupt (default)
1 = Channel 0 interrupt
0 = No channel 1 interrupt (default)
1 = Channel 1 interrupt
0 = No channel 2 interrupt (default)
1 = Channel 2 interrupt
0 = No channel 3 interrupt (default)
1 = Channel 3 interrupt
COMMAND
COMMAND
STATE
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