PCF8578T/1,118

Overview

• Category: Integrated Circuit (IC)
• Use: I/O Expander
• Characteristics: 8-bit I/O expander with I2C-bus/SPI interface
• Package: TSSOP-24
• Essence: The PCF8578T/1,118 is a versatile integrated circuit that expands the input/output capabilities of microcontrollers or other devices through the I2C-bus or SPI interface.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage: 2.5V to 6V
• I/O Voltage: 1.8V to VDD
• Input High Voltage: 0.7 x VDD to VDD + 0.3V
• Input Low Voltage: -0.3V to 0.3 x VDD
• Output High Voltage: VDD - 0.4V
• Output Low Voltage: 0.4V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The PCF8578T/1,118 has a total of 24 pins arranged as follows:

1 ──────────────── 24 │ │ │ │ │ 2 ──────────────── 23 │ │ │ │ │ 3 ──────────────── 22 │ │ │ │ │ 4 ──────────────── 21 │ │ │ │ │ 5 ──────────────── 20 │ │ │ │ │ 6 ──────────────── 19 │ │ │ │ │ 7 ──────────────── 18 │ │ │ │ │ 8 ──────────────── 17 │ │ │ │ │ 9 ──────────────── 16 │ │ │ │ │ 10 ──────────────── 15 │ │ │ │ │ 11 ──────────────── 14 │ │ │ │ │ 12 ──────────────── 13

Functional Features

• Provides 8-bit bidirectional I/O expansion
• Supports both I2C-bus and SPI interface modes
• Can be cascaded with other PCF8578T/1,118 devices for further expansion
• Low standby current consumption
• Interrupt output pin for efficient communication

Advantages and Disadvantages

Advantages: - Easy to use and integrate into existing systems - Versatile interface options (I2C-bus/SPI) - Expandable by cascading multiple devices - Low power consumption in standby mode

Disadvantages: - Limited number of I/O pins (8 bits) - Requires additional components for proper operation (microcontroller, etc.)

Working Principles

The PCF8578T/1,118 operates by receiving commands and data through the I2C-bus or SPI interface. It can function as an input or output expander, allowing microcontrollers or other devices to control or read from external devices. The device supports bidirectional communication, enabling both input and output operations on the same pins.

Detailed Application Field Plans

The PCF8578T/1,118 finds applications in various fields, including but not limited to:

1. Industrial automation: Controlling and monitoring multiple sensors and actuators.
2. Home automation: Expanding the I/O capabilities of smart home devices.
3. Automotive electronics: Interface expansion for dashboard controls and infotainment systems.
4. Medical equipment: Connecting and controlling various medical sensors and devices.
5. Consumer electronics: Enhancing the functionality of electronic gadgets and appliances.

Alternative Models

• PCF8574T/1,118: 8-bit I/O expander with I2C-bus interface.
• MCP23S17-E/SO: 16-bit I/O expander with SPI interface.
• MAX7313AUG+: 16-bit I/O expander with I2C-bus interface.

These alternative models offer similar functionality and can be considered as alternatives to the PCF8578T/1,118 based on specific requirements.

In conclusion, the PCF8578T/1,118 is a versatile I/O expander IC that provides