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PCAL9555A Datasheet Low-voltage 16-bit I2C-bus GPIO

Manufacturer: NXP Semiconductors

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General Description

The PCAL9555A 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 PCAL9555A to interface with next-generation microprocessors and microcontrollers where supply levels are dropping down to conserve power.

Overview

PCAL9555A Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev.

2 — 19 December 2014 Product data sheet 1.

Key Features

  • 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 rese.

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