MAX7369 Maxim Integrated Products, MAX7369 Datasheet - Page 12

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

The MAX7367/MAX7368/MAX7369 bidirectional, four-
channel I
bus up to four extended buses. The MAX7369 is a 1:4
multiplexer that connects the main I
nel at a time. The MAX7367/MAX7368 are four-channel
switches that can connect the main I
more channels at a time. These devices isolate bus
loading by separating available I
on the channels. The total loading capacitance of the
main bus plus those of the connected channel must not
exceed 400pF. The extended buses are connected or
disconnected through the main I
control register of the MAX7367/MAX7368/MAX7369.
Any device connected to an I
receive signals. The MAX7367/MAX7368/MAX7369 are
transparent to signals sent and received at each channel,
allowing multiple masters on the buses. These devices
are compatible with the I
chronization, and arbitration in case of multiple masters
addressing the bus at the same time. The
MAX7367/MAX7368 have a RESET input that allows
external circuitry to set the MAX7367/MAX7368 to its
default state anytime after the device has powered up.
The MAX7367/MAX7369 have interrupt inputs, allowing
devices on the extended bus to send an interrupt signal
to the master on the main bus.
The MAX7367/MAX7368/MAX7369 have selectable
device addresses through external inputs. The
MAX7367 slave address consists of 5 fixed bits
(A6–A2, set to 11100), followed by 2 pin-programmable
bits (A1 and A0), as shown in Figure 4. The MAX7368/
MAX7369 slave address consists of 4 fixed bits
(A6–A3, set to 1110), followed by 3 pin-programmable
bits (A2, A1 and A0), as shown in Figure 5. The most
significant address bit (A6) is transmitted first, followed
by the remaining bits. The addresses A2 (for MAX7368/
MAX7369), A1, and A0 can also be driven dynamically
if required, but the values must be stable when they are
expected in the address sequence.
There is a control/interrupt register inside the MAX7367/
MAX7369 (Figures 6 and 8). There is a control (only)
register inside the MAX7368 (Figure 7). Use the main
I
successful acknowledgement of the slave address, the
4-Channel I
12
2
C bus to write or read from this register. Following the
______________________________________________________________________________________
2
C switches/multiplexer expand the main I
Control/Interrupt Register
Detailed Description
2
C protocol of clock stretch, syn-
2
C Switches/Multiplexer
2
C bus can transmit and
2
2
C bus by writing to the
C devices into groups
2
Device Address
C bus to one chan-
2
C bus to one or
2
C
master bus sends a byte or the master bus receives a
byte from/to the MAX7367/MAX7368/MAX7369. The last
3 bits (for the MAX7369) or 4 bits (for the MAX7367/
MAX7368) of the byte are stored in the control/interrupt
register (B0 to B2 or B0 to B3) for channel selection. If
multiple bytes are received, only the last byte received
is saved. The first four bits of the register represent the
interrupt condition (for the MAX7367/MAX7369 only).
Figure 4. MAX7367 Slave Address
Figure 5. MAX7368/MAX7369 Slave Address
Figure 6. MAX7367 Control/Interrupt Register
INT3
7
INTERRUPT BITS
INT2
(READ ONLY)
6
1
1
INT1
5
1
1
FIXED
FIXED
INT0
4
1
1
B3
0
0
CHANNEL SELECTION BITS
3
HARDWARE SELECTION
(READ/WRITE)
A2
0
B2
HARDWARE SELECTION
2
A1
A1
B1
1
A0
A0
B0
0
R/W
R/W
CHANNEL 0
CHANNEL 1
CHANNEL 2
CHANNEL 3
INT0
INT1
INT2
INT3