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A1

A2

P00

P01

P02

P03

P04

P05

P06

P07

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SDA

SCL

A0

P17

P16

P15

P14

P13

P12

P11

P10

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24

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RGE PACKAGE

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19

12

P00

P01

P02

P03

P04

P05

A0

P17

P16

P15

P14

P13

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PCA9555

SCPS131F – AUGUST 2005 – REVISED JUNE 2014

Configuration Registers

1 Features

2 Description

This 16-bit I/O expander for the two-line bidirectional

1

•

Low Standby-Current Consumption of 1

μA Max

•

operation. It provides general-purpose remote I/O

•

Open-Drain Active-Low Interrupt Output

interface [serial clock (SCL), serial data (SDA)].

•

5-V Tolerant I/O Ports

•

Compatible With Most Microcontrollers

The PCA9555 consists of two 8-bit Configuration

(input or output selection), Input Port, Output Port,

•

and Polarity Inversion (active high or active low

•

Address by Three Hardware Address Pins for Use

operation) registers. At power on, the I/Os are

of up to Eight Devices

configured as inputs. The system master can enable

•

Polarity Inversion Register

the I/Os as either inputs or outputs by writing to the

I/O configuration bits. The data for each input or

•

Latched Outputs With High-Current Drive

output is kept in the corresponding Input or Output

Capability for Directly Driving LEDs

register. The polarity of the Input Port register can be

•

Latch-Up Performance Exceeds 100 mA Per

inverted with the Polarity Inversion register. All

JESD 78, Class II

registers can be read by the system master.

•

ESD Protection Exceeds JESD 22

Device Information(1)

–

2000-V Human-Body Model (A114-A)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

200-V Machine Model (A115-A)

SSOP (16)

6.20 mm × 5.30 mm

–

1000-V Charged-Device Model (C101)

PCA9555

VQFN (16)

4.00 mm × 4.00 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.