View source for Texas Instruments PCA9554 GPIO(I2C)

[[Image:TArduinoPCA9554.png]]

== Summary ==  
I2C-controlled GPIO expander with 8 channels, configurable as inputs or outputs with optional inversion.  

== Description ==  
The **PCA9554** component allows 8 GPIO channels to be controlled via I2C.  
Each channel can be configured individually as an input or output, with options for inverted logic.  
This makes it useful for expanding the number of digital I/O pins on a microcontroller, controlling LEDs, buttons, or other digital devices.  

<b>Diagram:</b>  

[[Image:TArduinoPCA9554.Preview.png]]

== Properties ==  
=== Channel Properties ===  
Each channel (Channel[0] to Channel[7]) has the following properties:  
*'''Auto Config''' – Automatically configure channel at startup.  
*'''Initial Value''' – Default digital value (boolean).  
*'''Is Inverted''' – Invert the logic of the channel.  
*'''Is Output''' – Configure the channel as digital output (otherwise input).  

== Pins ==  

{| class="wikitable"
! Channel !! Digital Input !! Digital Output
|-
| Channel[0] || In (Digital) || Out
|-
| Channel[1] || In (Digital) || Out
|-
| Channel[2] || In (Digital) || Out
|-
| Channel[3] || In (Digital) || Out
|-
| Channel[4] || In (Digital) || Out
|-
| Channel[5] || In (Digital) || Out
|-
| Channel[6] || In (Digital) || Out
|-
| Channel[7] || In (Digital) || Out
|}

=== I2C Pins ===  
*'''I2C''' – I2C communication pins for controlling the PCA9554.  


== Categories ==  
*[[Image:TArduinoI2CCategory.png]] [[Category I2C]] – Components controlled via I2C bus.  
*[[Image:TArduinoDigitalCategory.png]] [[Category Digital]] – Components handling digital logic signals.  

[[Category:Components]]