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PCA9555

16-bit I2C and SMBus I/O port with interrupt

Philips Electronics 

Philips Semiconductors

16-bit I2C and SMBus I/O port with interrupt

Product data sheet

PCA9555

FEATURES

• Operating power supply voltage range of 2.3 V to 5.5 V

• 5 V tolerant I/Os

• Polarity inversion register

• Active-LOW interrupt output

• Low stand-by current

• Noise filter on SCL/SDA inputs

• No glitch on power-up

• Internal power-on reset

• 16 I/O pins which default to 16 inputs

• 0 kHz to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

200 V MM per JESD22-A115, and 1000 V CDM per

JESD22-C101

• Latch-up testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Five packages offered: DIP24, SO24, SSOP24, TSSOP24, and

HVQFN24

DESCRIPTION

The PCA9555 is a 24-pin CMOS device that provide 16 bits of

General Purpose parallel Input/Output (GPIO) expansion for

I2C/SMBus applications and was developed to enhance the Philips

family of I@C I/O expanders. The improvements include higher drive

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

configuration, and smaller packaging. I/O expanders provide a

simple solution when additional I/O is needed for ACPI power

switches, sensors, pushbuttons, LEDs, fans, etc.

The PCA9555 consist of two 8-bit Configuration (Input or Output

selection); Input, Output and Polarity inversion (Active-HIGH or

Active-LOW operation) registers. The system master can enable the

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 register. The polarity of the read register can be

inverted with the Polarity Inversion Register. All registers can be

read by the system master. Although pin-to-pin and I2C address

compatible with the PCF8575, software changes are required due to

the enhancements and are discussed in Application Note AN469.

The PCA9555 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. 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 address and

allow up to eight devices to share 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.

ORDERING INFORMATION

PACKAGES

TEMPERATURE

RANGE

ORDER CODE

TOPSIDE MARK

DRAWING NUMBER

24-Pin Plastic DIP

–40 °C to +85 °C

PCA9555N

PCA9555

24-Pin Plastic SO

–40 °C to +85 °C

PCA9555D

PCA9555D

24-Pin Plastic SSOP

–40 °C to +85 °C

PCA9555DB

PCA9555

24-Pin Plastic TSSOP

–40 °C to +85 °C

PCA9555PW

PCA9555

24-Pin Plastic HVQFN

–40 °C to +85 °C

PCA9555BS

9555

Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.

I2C is a trademark of Philips Semiconductors Corporation.

SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I2C patent.

SOT101-1

SOT137-1

SOT340-1

SOT355-1

SOT616-1

2004 Sep 30

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