PCF8579HT/1

Product Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: High-performance, 16-bit I/O expander with I2C-bus interface
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCF8579HT/1 is a versatile I/O expander IC that provides additional input/output ports for microcontrollers or other digital devices.
• Packaging/Quantity: Available in reels of 2500 pieces

Specifications

• Supply Voltage: 2.5V to 6V
• I2C-bus interface compatibility: Standard-mode, Fast-mode, and Fast-mode Plus
• Maximum I2C-bus frequency: 400 kHz
• Number of I/O pins: 16
• Input/Output voltage range: 0V to VDD
• Operating temperature range: -40°C to +85°C

Detailed Pin Configuration

The PCF8579HT/1 has a total of 24 pins. The pin configuration is as follows:

1. SDA: Serial Data Input/Output
2. SCL: Serial Clock Input
3. A0: Address Input Bit 0
4. A1: Address Input Bit 1
5. A2: Address Input Bit 2 6-21: P0-P15: General Purpose Input/Output Pins 22: RESET: Reset Input 23: VDD: Positive Supply Voltage 24: GND: Ground

Functional Features

• Bidirectional I/O Ports: Each of the 16 I/O pins can be individually configured as an input or output.
• Interrupt Output: The PCF8579HT/1 can generate an interrupt signal to the microcontroller when any of the input pins change state.
• Programmable Output Polarity: The output polarity of each I/O pin can be inverted, allowing for flexible interfacing with different devices.
• Power-On Reset: The IC includes a power-on reset circuit that initializes all the I/O pins to a defined state upon power-up.

Advantages and Disadvantages

Advantages: - Provides additional I/O ports without requiring extra microcontroller pins - Compatible with various I2C-bus interfaces - Low power consumption - Easy to use and integrate into existing systems

Disadvantages: - Limited number of I/O pins (16) - Requires an external pull-up resistor for the I2C-bus interface

Working Principles

The PCF8579HT/1 is controlled through the I2C-bus interface. It communicates with the microcontroller or other devices by sending and receiving data serially. The I/O pins can be configured as inputs or outputs based on the desired application. The IC also supports interrupt generation, allowing the microcontroller to respond quickly to changes in input states.

Detailed Application Field Plans

The PCF8579HT/1 finds applications in various fields, including but not limited to: - Industrial automation - Home automation - Automotive electronics - Consumer electronics - Medical devices

In industrial automation, it can be used to expand the number of I/O ports in control systems. In home automation, it can enable the control of multiple devices using a single microcontroller. In automotive electronics, it can be utilized for controlling various vehicle functions. In consumer electronics, it can enhance the functionality of devices such as remote controls. In medical devices, it can provide additional I/O capabilities for monitoring and control purposes.

Detailed and Complete Alternative Models

Some alternative models to the PCF8579HT/1 include: - MCP23017: 16-bit I/O expander with I2C-bus/SPI interface - MAX7313: 16-bit I/O expander with serial interface - PCA9555: 16-bit I/O expander with I2C-bus interface - SX1509: 16-channel GPIO expander with I2C-bus interface

These alternative models offer similar functionality and can be used as replacements depending on specific requirements.

In conclusion, the PCF8579HT/1 is a high-performance I/O expander IC that provides additional input/output ports for various applications. Its versatility, compatibility with I2C-bus interfaces, and programmable features make it a popular choice in the field of digital electronics.