PCA9555N,112

Product Overview

Category

The PCA9555N,112 belongs to the category of integrated circuits (ICs) and specifically falls under the family of I/O expanders.

Use

This product is primarily used for expanding the input/output (I/O) capabilities of microcontrollers or other digital systems. It allows for additional digital inputs and outputs to be controlled using a minimal number of pins on the host device.

Characteristics

• I2C-bus interface compatibility
• 16-bit remote bidirectional I/O port
• Low standby current consumption
• Noise filter on SCL/SDA inputs
• Polarity inversion register
• Internal power-on reset

Package

The PCA9555N,112 is available in a standard 24-pin plastic dual in-line package (DIP). This package provides ease of use and compatibility with various circuit board designs.

Essence

The essence of the PCA9555N,112 lies in its ability to extend the I/O capabilities of digital systems without requiring a significant number of additional pins on the host device.

Packaging/Quantity

The PCA9555N,112 is typically packaged in reels or tubes, with each reel containing 2500 units. However, it is also available in smaller quantities for prototyping purposes.

Specifications

• Supply voltage: 2.3V to 5.5V
• I/O voltage level: 1.8V to 5.5V
• Maximum frequency: 400 kHz
• Operating temperature range: -40°C to +85°C
• RoHS compliant

Detailed Pin Configuration

The PCA9555N,112 has a total of 24 pins, which are assigned specific functions as follows:

1. A0: Address input bit 0
2. A1: Address input bit 1
3. A2: Address input bit 2
4. SDA: I2C-bus serial data line
5. SCL: I2C-bus serial clock line 6-21. P0-P15: Bidirectional I/O ports
6. INT: Interrupt output
7. RESET: Reset input
8. VCC: Supply voltage

Functional Features

1. I2C-bus Interface: The PCA9555N,112 is compatible with the widely used I2C-bus interface, allowing for easy integration into existing systems.

2. Bidirectional I/O Ports: The device provides 16 bidirectional I/O ports that can be individually configured as inputs or outputs.

3. Noise Filter: The integrated noise filter on the SCL/SDA inputs helps to improve signal integrity and reduce the impact of external disturbances.

4. Polarity Inversion: The polarity inversion register allows for the inversion of input/output logic levels, providing flexibility in interfacing with different devices.

5. Power-On Reset: The internal power-on reset ensures proper initialization of the device upon power-up, enhancing system reliability.

Advantages and Disadvantages

Advantages

• Simplifies I/O expansion in digital systems
• Requires fewer pins on the host device
• Compatible with standard I2C-bus interface
• Low standby current consumption
• Noise filtering improves signal integrity

Disadvantages

• Limited number of I/O ports (16 in total)
• Relies on the availability of an I2C-bus interface on the host device

Working Principles

The PCA9555N,112 operates by communicating with the host device through the I2C-bus interface. It receives commands and data from the host, which are used to configure the I/O ports as inputs or outputs. The device monitors the status of the input ports and allows the host to read or write to the output ports accordingly. The bidirectional nature of the ports enables versatile usage in various applications.

Detailed Application Field Plans

The PCA9555N,112 finds applications in a wide range of fields, including but not limited to:

1. Industrial Automation: Used for controlling and monitoring multiple sensors and actuators in industrial automation systems.

2. Home Automation: Enables expansion of I/O capabilities in home automation devices, such as smart lighting systems and security systems.

3. Consumer Electronics: Integrated into consumer electronic products to provide additional control interfaces, such as buttons and switches.

4. Internet of Things (IoT): Facilitates the connection of IoT devices with limited I/O pins to a larger network, enhancing their functionality.

Detailed and Complete Alternative Models

• PCA9554PW,118
• MCP23017-E/SP
• MAX7313ATG+
• TCA9539PW,118
• SX1509BIULTRT

These alternative models offer similar functionality and can be considered as substitutes for the PCA9555N,112 depending on specific requirements and availability.