PCA9554PWR

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9554PWR is a 8-bit I2C-bus and SMBus I/O expander designed for applications that require additional I/O pins. It provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics: - 8-bit remote I/O port with interrupt output - Low standby current consumption of 1 µA - Compatible with I2C-bus and SMBus interfaces - Schmitt trigger inputs for noise suppression - Open-drain interrupt output - Polarity inversion register to configure the polarity of the input port data - Internal power-on reset

Package: TSSOP (Thin Shrink Small Outline Package)

Essence: The PCA9554PWR is an integrated circuit that expands the number of available I/O pins in microcontroller-based systems. It allows for easy integration of additional input/output functionality without requiring extensive hardware modifications.

Packaging/Quantity: The PCA9554PWR is typically sold in reels, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input Voltage Range: 0 V to VDD
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400 kHz
• Maximum Output Current: 25 mA per I/O pin

Pin Configuration

The PCA9554PWR has a total of 16 pins, which are assigned specific functions as follows:

| Pin Number | Pin Name | Function | |------------|----------|----------| | 1 | A0 | Address Input Bit 0 | | 2 | A1 | Address Input Bit 1 | | 3 | A2 | Address Input Bit 2 | | 4-11 | P0-P7 | I/O Port Pins | | 12 | INT | Interrupt Output | | 13 | SDA | I2C-bus Serial Data | | 14 | SCL | I2C-bus Serial Clock | | 15 | GND | Ground | | 16 | VDD | Supply Voltage |

Functional Features

1. I2C-bus Interface: The PCA9554PWR communicates with the microcontroller via the I2C-bus interface, allowing for easy integration into existing systems.

2. Remote I/O Expansion: It provides an additional 8-bit remote I/O port, which can be used to connect external devices or sensors.

3. Interrupt Output: The interrupt output pin (INT) can be configured to generate an interrupt signal to the microcontroller when a change in input status is detected.

4. Low Standby Current Consumption: The PCA9554PWR has a low standby current consumption of only 1 µA, making it suitable for battery-powered applications.

5. Schmitt Trigger Inputs: The Schmitt trigger inputs help suppress noise and provide reliable input signal detection.

6. Polarity Inversion Register: The polarity inversion register allows the user to configure the polarity of the input port data.

Advantages and Disadvantages

Advantages: - Easy integration with microcontroller-based systems - Provides additional I/O pins without extensive hardware modifications - Low standby current consumption - Compatible with I2C-bus and SMBus interfaces - Schmitt trigger inputs for noise suppression

Disadvantages: - Limited number of I/O pins (8-bit)

Working Principles

The PCA9554PWR works by communicating with the microcontroller through the I2C-bus interface. The microcontroller sends commands and data to the PCA9554PWR, which in turn controls the input/output pins accordingly. The interrupt output pin can be used to notify the microcontroller of any changes in the input status.

Application Field Plans

The PCA9554PWR can be used in various applications that require additional I/O pins, such as: - Home automation systems - Industrial control systems - Internet of Things (IoT) devices - Robotics - Sensor networks

Alternative Models

1. PCA9554AD: Similar to PCA9554PWR, but available in an SOIC (Small Outline Integrated Circuit) package.
2. PCA9554ARGTR: Similar to PCA9554PWR, but available in a QFN (Quad Flat No-Lead) package.
3. PCA9554PW: Similar to PCA9554PWR, but available in a TSSOP package with a different pin configuration.

These alternative models offer similar functionality to the PCA9554PWR and can be chosen based on specific application requirements.

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