MAX7325ATG+ MAXIM [Maxim Integrated Products], MAX7325ATG+ Datasheet - Page 9

• Manufacturer Part Number: MAX7325ATG+
• Description: I2C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os
• Manufacturer: MAXIM [Maxim Integrated Products]

I/O port inputs switch at the CMOS-logic levels as
determined by the expander’s supply voltage, and are
overvoltage tolerant to +6V, independent of the
expander’s supply voltage.
All I/O ports configured as inputs are monitored for
changes since the expander was last accessed through
the serial interface. The state of the ports is stored in an
Table 3. MAX7325 Address Map for Outputs O8–O15
C O NN EC TIO N
GND
GND
GND
GND
AD2
SDA
SDA
SDA
SDA
SCL
SCL
SCL
SCL
V+
V+
V+
V+
PIN
GND
GND
GND
GND
AD0
SDA
SDA
SDA
SDA
SCL
SCL
SCL
SCL
V+
V+
V+
V+
I/O Port Input Transition Detection
A6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
_______________________________________________________________________________________
A5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DEVICE ADDRESS
A4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
I
2
C Port Expander with 8 Push-Pull
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Port Inputs
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
internal “snapshot” register for transition monitoring. The
snapshot is continuously compared with the actual input
conditions, and if a change is detected for any port input,
INT is asserted to signal a state change. The input ports
are sampled (internally latched into the snapshot register)
and the old transition flags cleared during the I
edge of every MAX7325 read and write access. The previ-
ous port transition flags are read through the serial
interface as the second byte of a 2-byte read sequence.
O15
and 8 Open-Drain I/Os
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
O14
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
OUTPUTS POWER-UP DEFAULT
O13
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
O12
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
O11
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
O10
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
2
O9
C acknowl-
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
O8
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
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