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4-bit I
2
C-bus and SMBus low power I/O port with interrupt and reset
2016-01-0029 PT0565-1 02/15/16
1
Features
Operation power supply voltage from 2.3V to 5.5V
4-bit I
2
C-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: MSOP-10L
Pin Configuration
Description
The PI4IOE5V9537 provides 4 bits of General
Purpose parallel Input/Output (GPIO) expansion for
I
2
C-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 PI4IOE5V9537 consists of a 4-bit register to
configure the I/Os as either inputs or outputs, and a 4-
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 PI4IOE5V9537 open-drain interrupt output
(INT) is activated when any input state 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 causes the same reset/initialization to
occur without de-powering the device.
Figure 1: MSOP-10
