PI4IOE5V9554 Datasheet, PDF (1/1 Pages) Pericom Semiconductor Corporation – SMBus I/O port with Interrupt

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PI4IOE5V9554/PI4IOE5V9554A
8-bit I²C-bus and SMBus I/O port with Interrupt
Description
The PI4IOE5V9554 and PI4IOE5V9554A provide 8 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 PI4IOE5V9554/PI4IOE5V9554A consist of an 8-bit reg-
ister to configure the I/Os as either inputs or outputs, and an
8-bit polarity register to change the polarity of the inputted
data. The data for each input or output is kept in the corre-
sponding Input or Output register. All registers can be read
by the system master.
The PI4IOE5V9554/PI4IOE5V9554A open-drain interrupt
output is activated and indicate to the system when any input
state has changed. The power-on reset sets the registers to
their default values and initializes the device state machine.
Three hardware pins (A0, A1, A2) vary the fixed I²C-bus
address and allow up to eight devices to share the same
I²C-bus/SMBus. The PI4IOE5V9554A is identical to the
PI4IOE5V9554 except that the fixed I²C-bus address is differ-
ent allowing up to sixteen of these devices(eight of each) on
the same I²C-bus/SMBus
Features
ÎÎOperation power supply voltage from 2.3V to 5.5 V
ÎÎ8-bit I2C-bus GPIO with interrupt and reset
ÎÎ5V tolerant I/Os
ÎÎPolarity inversion register
ÎÎActive LOW interrupt output
ÎÎLow current consumption
ÎÎ0Hz to 400KHz clock frequency
ÎÎNoise filter on SCL/SDA inputs
ÎÎPower-on reset
ÎÎESD protection (4KV HBM and 1KV CDM)
ÎÎOffered in four different packages: SOIC16,
TSSOP16 and TQFN16(3*3), TQFN16(4*4)
Block Diagram
PI4IOE5V9554
A0
A1
A2
SCL
Input
SDA
Filter
VDD
Power-On
Reset
VSS
8-bit
I²C Bus/SMBus
Control
write pulse
Input/
Output
Ports
read pulse
LP
Filter
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
VDD
INT
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