PCA9502BS,128

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital I/O Expander
• Characteristics: High-speed, low-power, 16-bit I2C-bus and SMBus I/O expander
• Package: Small Outline Package (SOP)
• Essence: The PCA9502BS,128 is a versatile digital I/O expander designed to provide additional input/output ports for microcontrollers or other digital devices.
• Packaging/Quantity: Available in tape and reel packaging with 2500 units per reel.

Specifications

• Interface: I2C-bus and SMBus compatible
• Number of I/O Ports: 16
• Supply Voltage: 1.65V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Frequency: 400 kHz
• Current Consumption: 2.5 mA (typical)

Pin Configuration

The PCA9502BS,128 has a total of 24 pins. The pin configuration is as follows:

Pin 1: SDA - Serial Data Input/Output Pin 2: SCL - Serial Clock Input Pin 3-18: P0-P15 - General Purpose I/O Pins Pin 19: VDD - Supply Voltage Pin 20: GND - Ground Pin 21: RESET - Reset Input Pin 22: INT - Interrupt Output Pin 23: A0 - Address Bit 0 Pin 24: A1 - Address Bit 1

Functional Features

• Provides 16 general-purpose I/O pins that can be configured as inputs or outputs.
• Supports both the I2C-bus and SMBus protocols for communication with the host device.
• Allows individual pin configuration, including pull-up resistors and open-drain outputs.
• Supports interrupt functionality to notify the host device of input changes.
• Low power consumption makes it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Compact size and easy integration into existing systems. - Wide operating voltage range allows compatibility with various devices. - Flexible pin configuration options provide versatility in different applications. - Support for I2C-bus and SMBus protocols ensures compatibility with a wide range of microcontrollers.

Disadvantages: - Limited number of I/O pins may not be sufficient for complex applications requiring more inputs/outputs. - Lack of built-in protection features against overvoltage or ESD events.

Working Principles

The PCA9502BS,128 operates as an I/O expander by communicating with a host device (e.g., microcontroller) through the I2C-bus or SMBus interface. The host device sends commands and data to configure the I/O pins as inputs or outputs, set pull-up resistors, or enable interrupt functionality.

When configured as inputs, the expander monitors the state of the corresponding pins and can generate an interrupt signal if any changes occur. When configured as outputs, the expander drives the output pins accordingly.

The I2C-bus or SMBus protocol allows for efficient communication between the host device and the expander, enabling seamless integration into various digital systems.

Detailed Application Field Plans

The PCA9502BS,128 finds applications in a wide range of fields, including:

1. Embedded Systems: Used to expand the number of I/O ports in microcontroller-based systems, allowing connection to multiple peripheral devices such as sensors, actuators, and displays.

2. Industrial Automation: Enables control and monitoring of various industrial equipment and processes by providing additional digital I/O capabilities.

3. Home Automation: Integrates with smart home systems to control and monitor devices such as lights, switches, and sensors.

4. Consumer Electronics: Used in devices like gaming consoles, set-top boxes, and audio/video equipment to provide additional I/O ports for user interaction and connectivity.

5. Internet of Things (IoT): Facilitates the connection of IoT devices to a central controller or gateway, expanding the device's capabilities and enabling seamless integration into IoT networks.

Detailed and Complete Alternative Models

1. PCA9502BS,118
2. PCA9502BS,138
3. PCA9502BS,148
4. PCA9502BS,158
5. PCA9502BS,168

These alternative models are similar to the PCA9502BS,128 but may have variations in package type, pin configuration, or additional features. It is recommended to refer to the respective datasheets for detailed specifications and compatibility with specific applications.

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