PI4IOE5V9521 Datasheet, PDF (1/13 Pages) Pericom Semiconductor Corporation – interrupt and reset

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PI4IOE5V9521
2-bit I²C-bus and SMBus low power I/O port with interrupt and reset
Features
 Operation power supply voltage from 2.3V to 5.5V
 2-bit I²C-bus GPIO with interrupt and reset
 5V tolerant I/Os
 Active Low interrupt output
 Active Low reset input
 Polarity inversion register
 Low current consumption
 0Hz to 1MHz clock frequency
 Noise filter on SCL/SDA inputs
 Power-on reset
 ESD protection (4KV HBM and 1KV CDM)
 Package offered :UQFN 1.6x1.6-8
Pin Configuration
Description
The PI4IOE5V9521 provides 2 bits of General
Purpose parallel Input/Output (GPIO) expansion for
I²C-bus/ SMBus applications. It includes the features
such as higher driving capability, 5V tolerance, lower
power supply, individual I/O configuration, and
smaller packaging. It provides a simple solution when
additional I/O is needed for ACPI power switches,
sensors, push buttons, LEDs, fans, etc.
The PI4IOE5V9521 consists of a 2-bit
configuration register to configure the I/Os as either
inputs or outputs, and a 2-bit polarity register to change
the polarity of the input port register data. The data for
each input or output is kept in the corresponding Input
port or Output port register. All registers can be read
by the system master.
The PI4IOE5V9521 open-drain interrupt output
(INT) is activated when any input state is differed from
its corresponding Input Port register and is used to
indicate the system master that an input state has
changed.
The power-on reset sets the registers to their
default values and initializes the device state machine.
The Reset pin (Reset) causes the same
reset/initialization to occur without de-powering the
device.
Figure 1. UQFN 1.6 x 1.6-8
2016-02-0002
1
PT0564-1
03/29/16