Overview
The PCF8574ADWRE4 is an I/O port expander produced by Texas Instruments, designed to provide additional GPIO pins for microcontrollers via the I2C bus. This component is widely used in applications requiring extended I/O capabilities, such as industrial automation, consumer electronics, and embedded systems. Its compact TSSOP-20 package and low power consumption make it suitable for space-constrained and battery-powered devices. The PCF8574ADWRE4 stands out for its simplicity, reliability, and compatibility with most microcontrollers, making it a popular choice for developers seeking efficient I/O expansion solutions.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Manufacturer | Texas Instruments | - | - |
| Model | PCF8574ADWRE4 | - | - |
| Package | TSSOP-20 | - | 6.5 x 4.4 mm |
| I/O Ports | 8 | - | Configurable as input or output |
| Interface | I2C | - | 100 kHz clock frequency |
| Supply Voltage | 2.5 to 6 | V | - |
| Operating Temperature | -40 to +85 | °C | - |
| Output Type | Push-Pull | - | - |
| Moisture Sensitivity Level (MSL) | 1 | - | Unlimited |
| RoHS Compliance | Yes | - | - |
Key Features
- 8-bit I/O port expansion via I2C interface.
- Low standby current consumption (≤10 µA), ideal for battery-powered applications.
- Push-pull output type with high current drive capability, suitable for driving LEDs directly.
- Wide operating voltage range (2.5 V to 6 V) ensures compatibility with various microcontrollers.
- Interrupt output feature for efficient event-driven communication.
- Compact TSSOP-20 package for space-constrained designs.
Applications
The PCF8574ADWRE4 is widely used in applications requiring additional I/O ports, such as industrial automation, consumer electronics, and embedded systems. It is particularly useful in scenarios where the microcontroller has limited GPIO pins, such as controlling LED displays, keypad inputs, and relay modules. Its low power consumption and compact form factor make it ideal for portable devices and battery-powered applications. Additionally, its compatibility with I2C communication simplifies integration into existing systems, reducing development time and cost.
Q & A
1. What is the primary function of the PCF8574ADWRE4?
The PCF8574ADWRE4 is an I/O port expander that provides additional GPIO pins for microcontrollers via the I2C bus.
2. What is the operating voltage range of the PCF8574ADWRE4?
The operating voltage range is 2.5 V to 6 V.
3. How many I/O ports does the PCF8574ADWRE4 provide?
It provides 8 configurable I/O ports.
4. What is the clock frequency of the I2C interface?
The I2C interface operates at a clock frequency of 100 kHz.
5. Is the PCF8574ADWRE4 RoHS compliant?
Yes, it is RoHS compliant.
6. What is the package type of the PCF8574ADWRE4?
It comes in a TSSOP-20 package.
7. Can the PCF8574ADWRE4 drive LEDs directly?
Yes, its push-pull output type and high current drive capability make it suitable for driving LEDs directly.
8. What is the standby current consumption of the PCF8574ADWRE4?
The standby current consumption is ≤10 µA.
9. What is the operating temperature range of the PCF8574ADWRE4?
The operating temperature range is -40°C to +85°C.
10. Does the PCF8574ADWRE4 support interrupt functionality?
Yes, it features an interrupt output for efficient event-driven communication.
