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NXP Semiconductors Electronic Components Datasheet

PCA9555A Datasheet

Low-voltage 16-bit I2C-bus I/O port

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PCA9555A
Low-voltage 16-bit I2C-bus I/O port with interrupt and
weak pull-up
Rev. 1.1 — 6 October 2015
Product data sheet
1. General description
The PCA9555A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander
with interrupt and weak pull-up resistors for I2C-bus/SMBus applications. NXP I/O
expanders provide a simple solution when additional I/Os are needed while keeping
interconnections to a minimum, for example, in ACPI power switches, sensors, push
buttons, LEDs, fan control, etc.
In addition to providing a flexible set of GPIOs, the wide VDD range of 1.65 V to 5.5 V
allows the PCA9555A to interface with next-generation microprocessors and
microcontrollers where supply levels are dropping down to conserve power.
The PCA9555A contains the PCA9555 register set of four pairs of 8-bit Configuration,
Input, Output, and Polarity Inversion registers.
The PCA9555A is a pin-to-pin replacement to the PCA9555 and other industry-standard
devices. A more fully featured device, the PCAL9555A, is available with Agile I/O
features. See the respective data sheet for more details.
The PCA9555A open-drain interrupt (INT) 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.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt
signal on this line, the remote I/O can inform the microcontroller if there is incoming data
on its ports without having to communicate via the I2C-bus. Thus, the PCA9555A can
remain a simple slave device.
The device outputs have 25 mA sink capabilities for directly driving LEDs while consuming
low device current.
The power-on reset sets the registers to their default values and initializes the device state
machine.
All input/output pins have weak pull-up resistors connected to them to eliminate external
components.
Three hardware pins (A0, A1, A2) select the fixed I2C-bus address and allow up to eight
devices to share the same I2C-bus/SMBus.


NXP Semiconductors Electronic Components Datasheet

PCA9555A Datasheet

Low-voltage 16-bit I2C-bus I/O port

No Preview Available !

NXP Semiconductors
PCA9555A
Low-voltage 16-bit I2C-bus I/O port with interrupt and weak pull-up
2. Features and benefits
I2C-bus to parallel port expander
Operating power supply voltage range of 1.65 V to 5.5 V
Low standby current consumption:
1.5 A (typical at 5 V VDD)
1.0 A (typical at 3.3 V VDD)
Schmitt-trigger action allows slow input transition and better switching noise immunity
at the SCL and SDA inputs
Vhys = 0.10 VDD (typical)
5 V tolerant I/Os
Open-drain active LOW interrupt output (INT)
400 kHz Fast-mode I2C-bus
Internal power-on reset
Power-up with all channels configured as inputs with weak pull-up resistors
No glitch on power-up
Latched outputs with 25 mA drive maximum capability for directly driving LEDs
Latch-up performance exceeds 100 mA per JESD78, Class II
ESD protection exceeds JESD22
2000 V Human Body Model (A114-A)
1000 V Charged-Device Model (C101)
Packages offered: TSSOP24, HWQFN24
3. Ordering information
Table 1. Ordering information
Type number
Topside
marking
Package
Name
PCA9555APW PCA9555A TSSOP24
PCA9555AHF 555A
HWQFN24
Description
plastic thin shrink small outline package; 24 leads;
body width 4.4 mm
plastic thermal enhanced very very thin quad flat package;
no leads; 24 terminals; body 4 4 0.75 mm
Version
SOT355-1
SOT994-1
3.1 Ordering options
Table 2. Ordering options
Type number
Orderable
part number
PCA9555APW PCA9555APW,118
PCA9555AHF PCA9555AHF,128
Package
TSSOP24
HWQFN24
Packing method
Minimum
order quantity
REEL 13" Q1/T1 2500
*STANDARD MARK
SMD
REEL 13" Q2/T3 6000
*STANDARD MARK
SMD
Temperature
Tamb = 40 C to +85 C
Tamb = 40 C to +85 C
PCA9555A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 6 October 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
2 of 39


Part Number PCA9555A
Description Low-voltage 16-bit I2C-bus I/O port
Maker NXP
Total Page 30 Pages
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