PCA9554AD,112

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit I2C-bus and SMBus I/O expander with interrupt output and configuration registers
• Package: SO16 (Small Outline 16-pin package)
• Essence: The PCA9554AD,112 is a versatile I/O expander IC that provides additional input/output ports for microcontrollers or other devices.
• Packaging/Quantity: Available in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Number of I/O Ports: 8
• Interface: I2C-bus and SMBus compatible
• Supply Voltage: 2.3V to 5.5V
• Interrupt Output: Open-drain output
• Operating Temperature Range: -40°C to +85°C
• RoHS Compliant: Yes

Detailed Pin Configuration

The PCA9554AD,112 has a total of 16 pins arranged as follows:

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| | | 1 2 3 | | | | 4 5 6 | | | | 7 8 9 | | | | 10 11 12 | | | | 13 14 15 | |_______________| ```

Pin Description: 1. SDA: Serial Data Input/Output 2. SCL: Serial Clock Input 3. A0: Address Input 4. A1: Address Input 5. A2: Address Input 6. P0-P7: I/O Ports 0-7 7. INT: Interrupt Output 8. GND: Ground 9. P7-P0: I/O Ports 7-0 10. VCC: Supply Voltage

Functional Features

• The PCA9554AD,112 provides 8 additional I/O ports that can be used as inputs or outputs.
• It supports the I2C-bus and SMBus interfaces, allowing easy integration with microcontrollers and other devices.
• The interrupt output pin (INT) can be configured to indicate changes in the input states, reducing the need for continuous polling.
• Configuration registers allow customization of various features such as polarity inversion, input/output direction, and pull-up resistors.

Advantages and Disadvantages

Advantages: - Provides additional I/O ports without requiring extra pins on the microcontroller. - Supports multiple interface protocols, enhancing compatibility. - Interrupt functionality reduces the need for constant polling, saving processing power.

Disadvantages: - Limited number of I/O ports (8 in total). - Requires additional programming and configuration to utilize all features effectively.

Working Principles

The PCA9554AD,112 operates by communicating with a microcontroller or host device through the I2C-bus or SMBus interface. It acts as an intermediary between the microcontroller and external devices, expanding the available I/O ports. The microcontroller sends commands and data to the PCA9554AD,112, which then controls the state of the I/O ports accordingly. Changes in the input states can trigger an interrupt signal on the INT pin, notifying the microcontroller of any events.

Detailed Application Field Plans

The PCA9554AD,112 finds applications in various fields, including but not limited to: 1. Industrial automation: Used to expand the I/O capabilities of programmable logic controllers (PLCs) and industrial control systems. 2. Home automation: Enables the control of multiple devices and sensors using a single microcontroller. 3. Automotive electronics: Provides additional I/O ports for controlling lights, sensors, and other peripherals in vehicles. 4. Internet of Things (IoT): Facilitates the connection of multiple sensors and actuators to IoT devices.

Detailed and Complete Alternative Models

1. PCA9554PW,112: Similar to PCA9554AD,112 but available in a TSSOP16 package.
2. PCA9538PW,112: 8-bit I2C-bus and SMBus I/O expander with an interrupt output, but with different pin configuration and features.
3. MCP23008-E/SO: 8-bit I/O expander with I2C interface, compatible with PCA9554AD,112 in terms of functionality.

Note: This is not an exhaustive list, and there are several alternative models available from different manufacturers.

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