PCA8574TS,118

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit remote I/O expander for I2C-bus with interrupt
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCA8574TS,118 is a versatile I/O expander that allows users to increase the number of input/output pins of a microcontroller or other devices using the I2C-bus interface.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Number of I/O Pins: 8
• Supply Voltage Range: 2.3V to 5.5V
• I2C-bus Interface: Compatible with I2C-bus Fast-mode (400kHz) and Standard-mode (100kHz)
• Interrupt Output: Active-low open-drain output
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. SDA: Serial Data Input/Output pin for I2C communication.
2. SCL: Serial Clock Input pin for I2C communication.
3. A0: Address Select Input bit 0.
4. A1: Address Select Input bit 1.
5. A2: Address Select Input bit 2.
6. INT: Interrupt Output pin.
7. P7-P0: General Purpose Input/Output pins.

Functional Features

• Bidirectional I/O Ports: Each of the 8 I/O pins can be individually configured as either an input or an output.
• Interrupt Functionality: The INT pin can be used to generate an interrupt signal to the microcontroller when any of the I/O pins change state.
• Software Programmable I2C Address: The device supports up to 8 different I2C addresses, allowing multiple devices to be connected on the same I2C-bus.
• Low Standby Current: The PCA8574TS,118 has a low standby current consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Provides additional I/O pins without requiring extra microcontroller pins. - Easy integration with existing I2C-bus systems. - Interrupt functionality reduces the need for continuous polling of I/O pins.

Disadvantages: - Limited number of I/O pins (8 in total). - Requires an external pull-up resistor for the I2C-bus communication.

Working Principles

The PCA8574TS,118 is controlled via the I2C-bus interface. It acts as a slave device, receiving commands from the master (microcontroller) and responding accordingly. The I/O pins can be configured as inputs or outputs through software control. The device monitors the state of the I/O pins and generates an interrupt signal when any pin changes its state. This allows the microcontroller to respond promptly to events without continuously polling the I/O pins.

Detailed Application Field Plans

The PCA8574TS,118 finds applications in various fields, including: 1. Home Automation: Controlling lights, fans, and other appliances remotely. 2. Industrial Automation: Monitoring and controlling sensors, actuators, and switches. 3. Automotive Electronics: Interface expansion for dashboard controls, lighting systems, etc. 4. Internet of Things (IoT): Connecting sensors and actuators to IoT platforms. 5. Robotics: Expanding the I/O capabilities of microcontrollers used in robotic systems.

Detailed and Complete Alternative Models

1. PCA8574APW,112: Similar to PCA8574TS,118 but available in TSSOP package.
2. MCP23008: 8-bit I/O expander with I2C-bus interface.
3. PCF8574: 8-bit I/O expander with I2C-bus interface.

(Note: The above list is not exhaustive and there are other alternative models available in the market.)

This entry provides a comprehensive overview of the PCA8574TS,118 I/O expander, including its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.