PCA8574ATS,112

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
• Essence: The PCA8574ATS,112 is a versatile I/O expander that allows users to increase the number of input/output pins available in their microcontroller-based projects.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• I/O Voltage Range: 0V to VDD
• Maximum Output Current: 25mA per I/O pin
• Maximum Sink Current: 25mA per I/O pin
• I2C-bus Interface: Compatible with I2C 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

The PCA8574ATS,112 has a total of 16 pins, which are assigned as follows:

1. P0: I/O Port 0
2. P1: I/O Port 1
3. P2: I/O Port 2
4. P3: I/O Port 3
5. P4: I/O Port 4
6. P5: I/O Port 5
7. P6: I/O Port 6
8. P7: I/O Port 7
9. INT: Interrupt Output
10. SDA: I2C Data Line
11. SCL: I2C Clock Line
12. GND: Ground
13. A0: Address Select Bit 0
14. A1: Address Select Bit 1
15. A2: Address Select Bit 2
16. VDD: Supply Voltage

Functional Features

• I/O Expansion: The PCA8574ATS,112 provides 8 additional I/O pins that can be used as either inputs or outputs, allowing for increased flexibility in system design.
• Interrupt Functionality: The device supports an interrupt output pin (INT) that can be configured to generate an interrupt signal to the microcontroller when a change is detected on any of the I/O pins.
• Low Power Consumption: The IC is designed to operate with low power consumption, making it suitable for battery-powered applications.
• I2C Interface: The PCA8574ATS,112 communicates with the microcontroller using the I2C-bus interface, which simplifies the connection and control of multiple devices.

Advantages and Disadvantages

Advantages: - Provides additional I/O pins without requiring extra microcontroller pins. - Supports interrupt functionality for efficient event-driven programming. - Low power consumption extends battery life in portable applications. - Easy integration with microcontrollers through the I2C-bus interface.

Disadvantages: - Limited number of I/O pins compared to more advanced I/O expanders. - Requires knowledge of I2C-bus protocol for proper communication and configuration.

Working Principles

The PCA8574ATS,112 operates by communicating with the microcontroller through the I2C-bus interface. It acts as a slave device, controlled by the microcontroller acting as the master. The microcontroller sends commands and data to the PCA8574ATS,112 to configure its I/O pins as inputs or outputs and read or write their states.

When configured as an input, the PCA8574ATS,112 can detect changes in the logic level of the corresponding pin and generate an interrupt signal if enabled. When configured as an output, the device can drive a logic level on the corresponding pin.

Detailed Application Field Plans

The PCA8574ATS,112 finds applications in various fields, including but not limited to: - Home automation systems - Industrial control systems - Robotics - Internet of Things (IoT) devices - Sensor interfaces - Keypad scanning - LED matrix control

Detailed and Complete Alternative Models

• PCA8574AT: Similar to PCA8574ATS,112 but available in SOIC package.
• PCA9674: 8-bit I2C-bus/SMBus I/O expander with interrupt and reset.
• MCP23008: 8-bit I/O expander with I2C-bus interface.
• PCF8574: 8-bit I/O expander for I2C-bus with interrupt.

Note: This is not an exhaustive list, and there are several other alternative models available in the market.

In conclusion, the PCA8574ATS,112 is a versatile I/O expander that provides additional I/O pins for microcontroller-based projects. With its I2C-bus interface, interrupt functionality, and