NXP PCA9556 GPIO(I2C)

File:NPXPCA9556GPIOComponent.png

Summary

The NXP PCA9556 is a 8-bit GPIO expander controlled via the I2C bus. It provides eight bidirectional I/O pins that can be individually configured as inputs or open-drain outputs.

Description

The NXP PCA9556 GPIO (I2C) component interfaces with the PCA9556 chip, adding 8 configurable GPIO channels to your system over an I2C connection. Each channel can be independently set as an input to read a logic level or as an open-drain output to drive a signal low or into a high-impedance state.

The Auto Config property for each channel, when enabled, automatically applies the initial configuration (direction and value) for that specific channel to the chip upon startup.

Diagram:

Properties

Address – The I2C slave address for the PCA9556 device.

Per-Channel Properties (Channel[0] to Channel[7])

Auto Config – When True, automatically applies the Initial Value and Is Output configuration for this channel to the chip on startup.

Initial Value – The default Boolean value set on the channel when it is configured as an output.

Is Inverted – When True, the logic level of the pin is inverted (High becomes Low, and Low becomes High).

Is Output – Defines the direction of the channel. When True, the channel is an output; when False, it is an input.

Pins

Input Pins

In [0] – Boolean input for Channel 0 (only active when channel is an output).

In [1] – Boolean input for Channel 1 (only active when channel is an output).

In [2] – Boolean input for Channel 2 (only active when channel is an output).

In [3] – Boolean input for Channel 3 (only active when channel is an output).

In [4] – Boolean input for Channel 4 (only active when channel is an output).

In [5] – Boolean input for Channel 5 (only active when channel is an output).

In [6] – Boolean input for Channel 6 (only active when channel is an output).

In [7] – Boolean input for Channel 7 (only active when channel is an output).

Output Pins

I2C – The I2C bus connection. This pin must be connected to the board's I2C pin.

Out [0] – Boolean output from Channel 0 (only active when channel is an input).

Out [1] – Boolean output from Channel 1 (only active when channel is an input).

Out [2] – Boolean output from Channel 2 (only active when channel is an input).

Out [3] – Boolean output from Channel 3 (only active when channel is an input).

Out [4] – Boolean output from Channel 4 (only active when channel is an input).

Out [5] – Boolean output from Channel 5 (only active when channel is an input).

Out [6] – Boolean output from Channel 6 (only active when channel is an input).

Out [7] – Boolean output from Channel 7 (only active when channel is an input).

Categories

• File:TArduinoGPIOCategory.png Category GPIO – General Purpose Input/Output expansion and control.
• File:TArduinoI2CCategory.png Category I2C – I2C communication and device control.