IS31IO7325 Multi-Function I/O Driver Evaluation Board Guide
Integrated Silicon Solution, Inc. – www.issi.com
1
R1.0, 08/13/2012
Description
The IS31IO7325 2-wire serial-interfaced peripheral
features 16 I/O ports. Ports are divided into eight push
pull I/Os and eight open-drain I/Os and transition
detection.
Any of the 16 I/O ports can be configured as an input
or an output. All I/O ports configured as inputs are
continuously monitored for state changes (transition
detection). State changes are indicated by the INT
_______
output. The interrupt is latched, allowing detection of
transient
changes.
When
the
IS31IO7325
is
subsequently read through the serial interface, any
pending interrupt is cleared.
Features
•
Supply voltage range from 2.4V to 5.5V
•
400kHz I
2
C serial interface
•
8 push-pull I/O ports
•
8 open-drain I/O ports, rated to 20mA sink current
at 0.22V headroom
•
Selectable I/O port power-up default logic states
•
INT
_______
output alerts change on inputs
•
Low 0.3
µ
A (Typ.) standby current
•
Pb-free SOP-24 package
Quick Start
Recommended Equipment
•
2.5V~5.5V, 2A power supply
Absolute Maximum Ratings
•
≤
5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
Procedure
Follow the steps listed below operation.
1)
Connect power positive terminal to VCC pin and
negative terminal to GND pin.
2)
INT pin is pulled-up to VCC by a 4.7K
Ω
resistor.
3)
SCL is an input clock pin. SDA is a bi-direction
open drain pin. Both of them are pulled-up to
VCC by 4.7K
Ω
resistors.
4)
RST pin is Low active reset pin with 4.7K
Ω
resistor pull-up.
5)
AD1 and AD0 is used to set the I2C device
address. Their value can be 00, 01, 10 and 11 (0
is GND; 1 is VCC). After power-on, I/O output
will be dependent on the AD1 and AD0
connection (see Table 2 for details). Both AD1
and AD0 are pull-ed to GND by 100K
Ω
on this
demo board.
6)
TP6 is PP output port while TP7 is OD output
port.
Figure 1: Photo of IS31IO7325 Evaluation Board
Evaluation Board Ordering Information
Part No.
IC Package
IS31IO7325-GRLS4-TR SOP-24, Lead-free
Table1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing
team at
or (408) 969-6600.