PCA9555DB-T - Philips Semiconductors / NXP Semiconductors

PCA9554/54A/55

8- and 16-bit I2C and

SMBus I/O Port with Interrupt

The PCA9554/54A/55 were developed to enhance the Philips family

of I2C I/O expanders. The improvements include higher drive capability,

5V I/O tolerance, lower supply current, individual I/O configuration,

400 kHz clock frequency, and smaller packaging.

Philips Configuration

System Management ICs

Part Type Description

The PCA9554 and PCA9554A are 16-pin CMOS devices that provide

8 bits of General Purpose parallel Input/Output (GPIO) expansion for

I2C/SMBus applications. These I/O expanders provide a simple solu-

tion when additional I/O is needed for ACPI power switches, sensors,

pushbuttons, LEDs, fans, etc. The parts consist of an 8-bit Configura-

tion register (Input or Output selection); 8-bit Input register, 8-bit

Output register and an 8-bit Polarity inversion register (Active high or

Active low operation). The PCA9555 is a 24-pin CMOS device, which

provides 16 bits of GPIO and consists of two 8-bit Configuration,

Input, Output and Polarity inversion registers.

The system master can enable the PCA9554/54A/55 I/Os as either

inputs or outputs by writing to the I/O configuration bits. The data

for each Input or Output is kept in the corresponding Input or Output

Polarity Inversion Register. All registers can be read by the system mas-

ter. Although pin to pin and I2C address compatible with the PCF857X

series, software changes are required due to the enhancements and are

discussed in Application Note AN469. The PCA9554/54A/55 open-

drain interrupt output is activated when any input state differs from its

corresponding input port register state and is used to indicate to the

system master that an input state has changed. If an external hardware

reset is needed, the PCA9556/57 should be used.

Three hardware pins (A0, A1, A2) vary the fixed I2C address and allow

up to eight devices to share the same I2C/SMBus. The PCA9554A is

identical to the PCA9554 except that the fixed I2C address is different

allowing up to sixteen of these devices (eight of each) on the same

I2C/SMBus. The fixed I2C address of the PCA9555 is the same as the

PCA9554 allowing up to eight of these devices in any combination to

share the same I2C/SMBus.

PCA9554/54A/55 Features

•I

2C and SMBus compatible

• 8 or 16 programmable I/Os compatible with most processors

— Input or output

— Push-Pull or open-drain outputs

— True vs. quasi bi-directional style I/O

• Outputs can directly drive LEDs

— 25 mA max sink and 10 mA max source per bit

— Capacity of 100 mA max per 8-bit register

• Open-drain interrupt output activated when input changes state

•Low I

DDH standby current of 1.5 µA max

• 5 V tolerant I/Os

• Offered in SO Wide (D), SSOP (DB) and TSSOP (PW)

• Manufactured in high-volume CMOS process

PCA9554/54A/55 Operating Characteristics

• 2.3 V to 5.5 V operating voltage

• -40 to 85 ºC operating temperature range

• 0 to 400 kHz clock frequency

VDD

INT

I/O1

I/O2

VSS

I/O0

I/O3

SCL

SDA

I/O6

I/O4

I/O5

I/O7

PCA9554

PCA9554A

0100

SLAVE ADDRESS

FIXED PROGRAMMABLE

PCA9554/55

A2 A1 A0 R/W

0111

SLAVE ADDRESS

FIXED PROGRAMMABLE

A2 A1 A0 R/W

PCA9554A

INT

VDD

I/O1.7

I/O1.6

I/O1.5

I/O1.4

I/O1.3

I/O1.2

I/O1.1

I/O1.0

I/O0.1

I/O0.2

VSS

I/O0.4

I/O0.5

I/O0.7

I/O0.0

I/O0.3

I/O0.6

SCL

SDA

PCA9555

Pin Configurations

I2CAddress

Order Information

Package Container PCA9554 PCA9554A PCA9555

SO Tube PCA9554D PCA9554AD PCA9555D

T & R PCA9554D-T PCA9554AD-T PCA9555D-T

SSOP Tube PCA9554DB PCA9554ADB PCA9555DB

T & R PCA9554DB-T PCA9554ADB-T PCA9555DB-T

TSSOP Tube PCA9554PW PCA9554APW PCA9555PW

T & R PCA9554PW-T PCA9554APW-T PCA9555PW-T

PCA9554/

54A/55

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Printed in the USA Date of release: October 2001 Print code: 301673/FP/2pp/1001 Document ordering number: 9397 750 08924

PCA9554/54A/55

8- and 16-bit I2C and

SMBus I/O Port with Interrupt

The PCA9554/54A and

PCA9555 functional

diagram and I/O

schematic are identical

except that the PCA9555

has two 8-bit blocks of I/O.

The PCA9554/54A/55

feature outputs that

sink 25 mA and source

10 mA while quasi bi-

directional outputs sink

25 mA but limit the

source current to only

100 µA.

I2C/SMBus

CONTROL

INPUT/

OUTPUT

PORTS

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

INT

INPUT

FILTER

SCL

SDA

VDD

VSS

POWER/ON

RESET

LP FILTER

NOTE: ALL I/Os ARE SET TO INPUTS AT RESET

8-BIT

WRITE pulse

READ pulse

VCC

Block Diagram

CKQ

CONFIGURATION

100kΩ

OUTPUT

PORT

CKQ

POLARITY INVERSION

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

OUTPUT PORT

INPUT PORT

POLARITY

VDD

VSS

TO INT

I/O0 TO I/O7

WRITE

CONFIGURATION

PULSE

WRITE PULSE

WRITE

POLARITY

PULSE

READ PULSE

NOTE: AT POWER-ON RESET,

ALL REGISTERS RETURN

TO DEFAULT VALUES

Simplified Schematic of I/O0 to I/O7